Scholars@Duke
Daniel M. Scolnic

Daniel M. Scolnic

Associate Professor of Physics
Physics
daniel.scolnic@duke.edu
120 Science Drive, Durham, NC 27710
120 Science Drive, Box 90305, Durham, NC 27708

Selected Publications

Tip of the Red Giant Branch Distances with JWST. II. I-band Measurements in a Sample of Hosts of 10 Type Ia Supernova Match HST Cepheids

Journal Article Astrophysical Journal · December 1, 2024 The Hubble Tension, a >5σ discrepancy between direct and indirect measurements of the Hubble constant (H 0), has persisted for a decade and motivated intense scrutiny of the paths used to infer H 0. Comparing independently derived distances for a set of ga ... Full text Cite

Modelling the impact of host galaxy dust on type Ia supernova distance measurements

Journal Article Monthly Notices of the Royal Astronomical Society · November 1, 2024 Type Ia Supernovae (SNe Ia) are a critical tool in measuring the accelerating expansion of the universe. Recent efforts to improve these standard candles have focused on incorporating the effects of dust on distance measurements with SNe Ia. In this paper, ... Full text Cite

The Dark Energy Survey Supernova Program: Light Curves and 5 Yr Data Release

Journal Article Astrophysical Journal · November 1, 2024 We present griz photometric light curves for the full 5 yr of the Dark Energy Survey Supernova (DES-SN) program, obtained with both forced point-spread function photometry on difference images (DiffImg) performed during survey operations, and scene modelli ... Full text Cite

The Dark Energy Survey Supernova Program: Cosmological Analysis and Systematic Uncertainties

Journal Article Astrophysical Journal · November 1, 2024 We present the full Hubble diagram of photometrically classified Type Ia supernovae (SNe Ia) from the Dark Energy Survey supernova program (DES-SN). DES-SN discovered more than 20,000 SN candidates and obtained spectroscopic redshifts of 7000 host galaxies ... Full text Cite

WiFeS observations of nearby southern Type Ia supernova host galaxies

Journal Article Publications of the Astronomical Society of Australia · October 9, 2024 We present high-resolution observations of nearby galaxies that have hosted Type Ia supernovae to measure systemic spectroscopic redshifts using the wide field spectrograph (WiFeS) instrument on the Australian National University 2.3 m telescope at Siding ... Full text Cite

The DEHVILS in the details: Type Ia supernova Hubble residual comparisons and mass step analysis in the near-infrared

Journal Article Astronomy and Astrophysics · October 1, 2024 Measurements of type Ia supernovae (SNe Ia) in the near-infrared (NIR) have been used both as an alternate path to cosmology compared to optical measurements and as a method of constraining key systematics for the larger optical studies. With the DEHVILS s ... Full text Cite

The dark energy survey supernova program: investigating beyond-ΛCDM

Journal Article Monthly Notices of the Royal Astronomical Society · September 1, 2024 We report constraints on a variety of non-standard cosmological models using the full 5-yr photometrically classified type Ia supernova sample from the Dark Energy Survey (DES-SN5YR). Both Akaike Information Criterion (AIC) and Suspiciousness calculations ... Full text Cite

The Dark Energy Survey Supernova Program: slow supernovae show cosmological time dilation out to z ∼ 1.

Journal Article Monthly Notices of the Royal Astronomical Society · September 1, 2024 We present a precise measurement of cosmological time dilation using the light curves of 1504 Type Ia supernovae from the Dark Energy Survey spanning a redshift range 0.1 z 1.2. We find that the width of supernova light curves is proportional to (1 + z), a ... Full text Cite

Small Magellanic Cloud Cepheids Observed with the Hubble Space Telescope Provide a New Anchor for the SH0ES Distance Ladder

Journal Article Astrophysical Journal · September 1, 2024 We present phase-corrected photometric measurements of 88 Cepheid variables in the core of the Small Magellanic Cloud (SMC), the first sample obtained with the Hubble Space Telescope's (HST) Wide Field Camera 3, in the same homogeneous photometric system a ... Full text Cite

Measuring the ejecta velocities of type Ia supernovae from the pan-STARRS1 medium deep survey

Journal Article Monthly Notices of the Royal Astronomical Society · August 1, 2024 There is growing evidence that Type Ia supernovae (SNe Ia) may originate from multiple explosion channels. Previous studies have indicated that the ejecta velocity of SNe Ia is one powerful tool to discriminate between different channels. In this work, we ... Full text Cite

The dark energy survey: detection of weak lensing magnification of supernovae and constraints on dark matter haloes

Journal Article Monthly Notices of the Royal Astronomical Society · July 1, 2024 The residuals of the distance moduli of Type Ia supernovae (SNe Ia) relative to a Hubble diagram fit contain information about the inhomogeneity of the Universe, due to weak lensing magnification by foreground matter. By correlating the residuals of the Da ... Full text Cite

Reconnaissance with JWST of the J-region Asymptotic Giant Branch in Distance Ladder Galaxies: From Irregular Luminosity Functions to Approximation of the Hubble Constant

Journal Article Astrophysical Journal · May 1, 2024 We study stars in the J-regions of the asymptotic giant branch (JAGB) of near-infrared color-magnitude diagrams in the maser host NGC 4258 and four hosts of six Type Ia supernovae (SNe Ia): NGC 1448, NGC 1559, NGC 5584, and NGC 5643. These clumps of stars ... Full text Cite

Tip of the Red Giant Branch Distances with JWST: An Absolute Calibration in NGC 4258 and First Applications to Type Ia Supernova Hosts

Journal Article Astrophysical Journal · May 1, 2024 The tip of the red giant branch (TRGB) allows for the measurement of precise and accurate distances to nearby galaxies based on the brightest ascent of low-mass red giant branch stars before they undergo the helium flash. With the advent of JWST, there is ... Full text Cite

Amalgame: cosmological constraints from the first combined photometric supernova sample

Journal Article Monthly Notices of the Royal Astronomical Society · April 1, 2024 Future constraints of cosmological parameters from Type Ia supernovae (SNe Ia) will depend on the use of photometric samples, those samples without spectroscopic measurements of the SNe Ia. There is a growing number of analyses that show that photometric s ... Full text Cite

Evaluating the Consistency of Cosmological Distances Using Supernova Siblings in the Near-infrared

Journal Article Astrophysical Journal · April 1, 2024 The study of supernova (SN) siblings, supernovae with the same host galaxy, is an important avenue for understanding and measuring the properties of Type Ia SN Ia light curves (LCs). Thus far, sibling analyses have mainly focused on optical LC data. Consid ... Full text Cite

The Dark Energy Survey Supernova Program: Cosmological Biases from Host Galaxy Mismatch of Type Ia Supernovae

Journal Article Astrophysical Journal · April 1, 2024 Redshift measurements, primarily obtained from host galaxies, are essential for inferring cosmological parameters from type Ia supernovae (SNe Ia). Matching SNe to host galaxies using images is nontrivial, resulting in a subset of SNe with mismatched hosts ... Full text Cite

Enabling kilonova science with Nancy Grace Roman Space Telescope

Journal Article Astroparticle Physics · February 1, 2024 Binary neutron star mergers and neutron star–black hole mergers are multi-messenger sources that can be detected in gravitational waves and in electromagnetic radiation. The low electron fraction of neutron star merger ejecta favors the production of heavy ... Full text Cite

JWST Observations Reject Unrecognized Crowding of Cepheid Photometry as an Explanation for the Hubble Tension at 8σ Confidence

Journal Article Astrophysical Journal Letters · February 1, 2024 We present high-definition observations with the James Webb Space Telescope (JWST) of >1000 Cepheids in a geometric anchor of the distance ladder, NGC 4258, and in five hosts of eight Type Ia supernovae, a far greater sample than previous studies with JWST ... Full text Cite

Rates and properties of Type Ia supernovae in galaxy clusters within the dark energy survey

Journal Article Monthly Notices of the Royal Astronomical Society · December 1, 2023 We identify 66 photometrically classified Type Ia supernovae (SNe Ia) from the Dark Energy Survey (DES) that have occurred within red-sequence selected galaxy clusters. We compare light-curve and host galaxy properties of the cluster SNe to 1024 DES SNe Ia ... Full text Cite

A sample of dust attenuation laws for Dark Energy Survey supernova host galaxies

Journal Article Astronomy and Astrophysics · December 1, 2023 Context. Type Ia supernovae (SNe Ia) are useful distance indicators in cosmology, provided their luminosity is standardized by applying empirical corrections based on light-curve properties. One factor behind these corrections is dust extinction, which is ... Full text Cite

Leveraging SN Ia spectroscopic similarity to improve the measurement of H 0

Journal Article Journal of Cosmology and Astroparticle Physics · November 1, 2023 Recent studies suggest spectroscopic differences explain a fraction of the variation in Type Ia supernova (SN Ia) luminosities after light-curve/color standardization. In this work, (i) we empirically characterize the variations of standardized SN Ia lumin ... Full text Cite

Type Ia supernova observations combining data from the Euclid mission and the Vera C. Rubin Observatory

Journal Article Monthly Notices of the Royal Astronomical Society · October 1, 2023 The Euclid mission will provide first-of-its-kind coverage in the near-infrared over deep (three fields, ∼10-20 square degrees each) and wide (∼10 000 square degrees) fields. While the survey is not designed to discover transients, the deep fields will hav ... Full text Cite

Crowded No More: The Accuracy of the Hubble Constant Tested with High-resolution Observations of Cepheids by JWST

Journal Article Astrophysical Journal Letters · October 1, 2023 High-resolution James Webb Space Telescope (JWST) observations can test confusion-limited Hubble Space Telescope (HST) observations for a photometric bias that could affect extragalactic Cepheids and the determination of the Hubble constant. We present JWS ... Full text Cite

Standardized Luminosity of the Tip of the Red Giant Branch Utilizing Multiple Fields in NGC 4258 and the CATs Algorithm

Journal Article Astrophysical Journal · October 1, 2023 The tip of the red giant branch provides a luminous standard candle for calibrating distance ladders that reach Type Ia supernova (SN Ia) hosts. However, recent work reveals that tip measurements vary at the ∼0.1 mag level for different stellar populations ... Full text Cite

CATS: The Hubble Constant from Standardized TRGB and Type Ia Supernova Measurements

Journal Article Astrophysical Journal Letters · September 1, 2023 The tip of the red giant branch (TRGB) provides a luminous standard candle for constructing distance ladders to measure the Hubble constant. In practice, its measurements via edge-detection response (EDR) are complicated by the apparent fuzziness of the ti ... Full text Cite

Comparative Analysis of TRGBs (CATs) from Unsupervised, Multi-halo-field Measurements: Contrast is Key

Journal Article Astrophysical Journal · September 1, 2023 The tip of the red giant branch (TRGB) is an apparent discontinuity of the luminosity function (LF) due to the end of the red giant evolutionary phase and is used to measure distances in the local universe. In practice, tip localization via edge detection ... Full text Cite

A synthetic Roman Space Telescope High-Latitude Time-Domain Survey: supernovae in the deep field

Journal Article Monthly Notices of the Royal Astronomical Society · August 1, 2023 NASA will launch the Nancy Grace Roman Space Telescope (hereafter Roman) in the second half of this decade, which will allow for a generation-defining measurement of dark energy through multiple probes, including Type Ia supernovae (SNe Ia). To improve dec ... Full text Cite

Connecting Infrared Surface Brightness Fluctuation Distances to Type Ia Supernova Hosts: Testing the Top Rung of the Distance Ladder

Journal Article Astrophysical Journal · August 1, 2023 We compare infrared surface brightness fluctuation (IR SBF) distances measured in galaxies that have hosted type Ia supernovae (SNe Ia) to distances estimated from SNe Ia light-curve fits. We show that the properties of the SNe Ia found in IR SBF hosts are ... Full text Cite

Propagating Uncertainties in the SALT3 Model-training Process to Cosmological Constraints

Journal Article Astrophysical Journal, Supplement Series · July 1, 2023 Type Ia supernovae (SNe Ia) are standardizable candles that must be modeled empirically to yield cosmological constraints. To understand the robustness of this modeling to variations in the model-training procedure, we build an end-to-end pipeline to test ... Full text Cite

The DEHVILS survey overview and initial data release: high-quality near-infrared Type Ia supernova light curves at low redshift

Journal Article Monthly Notices of the Royal Astronomical Society · June 1, 2023 While the sample of optical Type Ia supernova (SN Ia) light curves (LCs) usable for cosmological parameter measurements surpasses 2000, the sample of published, cosmologically viable near-infrared (NIR) SN Ia LCs, which have been shown to be good ‘standard ... Full text Cite

The Dark Energy Survey Supernova Program: Corrections on Photometry Due to Wavelength-dependent Atmospheric Effects

Journal Article Astronomical Journal · June 1, 2023 Wavelength-dependent atmospheric effects impact photometric supernova flux measurements for ground-based observations. We present corrections on supernova flux measurements from the Dark Energy Survey Supernova Program’s 5YR sample (DES-SN5YR) for differen ... Full text Cite

Dark Energy Survey Year 3 results: Constraints on extensions to ΛcDM with weak lensing and galaxy clustering

Journal Article Physical Review D · April 15, 2023 We constrain six possible extensions to the Λ cold dark matter (CDM) model using measurements from the Dark Energy Survey's first three years of observations, alone and in combination with external cosmological probes. The DES data are the two-point correl ... Full text Cite

SALT2 versus SALT3: updated model surfaces and their impacts on type Ia supernova cosmology

Journal Article Monthly Notices of the Royal Astronomical Society · April 1, 2023 For the past decade, SALT2 has been the most common model used to fit Type Ia supernova (SN Ia) light curves for dark energy analyses. Recently, the SALT3 model was released, which upgraded a number of model features but has not yet been used for measureme ... Full text Cite

The Pantheon+ Analysis: Forward Modeling the Dust and Intrinsic Color Distributions of Type Ia Supernovae, and Quantifying Their Impact on Cosmological Inferences

Journal Article Astrophysical Journal · March 1, 2023 Recent studies have shown that the observed color distributions of Type Ia supernovae (SNe Ia) can be well described by a combination of a dust distribution and an intrinsic color distribution. Using the Pantheon+ sample of 1701 SN Ia, we apply a new forwa ... Full text Cite

Concerning colour: The effect of environment on type Ia supernova colour in the dark energy survey

Journal Article Monthly Notices of the Royal Astronomical Society · February 1, 2023 Recent analyses have found intriguing correlations between the colour (c) of type Ia supernovae (SNe Ia) and the size of their ‘mass-step’, the relationship between SN Ia host galaxy stellar mass (Mstellar) and SN Ia Hubble residual, and suggest that the c ... Full text Cite

Cosmicflows-4

Journal Article Astrophysical Journal · February 1, 2023 With Cosmicflows-4, distances are compiled for 55,877 galaxies gathered into 38,065 groups. Eight methodologies are employed, with the largest numbers coming from the correlations between the photometric and kinematic properties of spiral galaxies (TF) and ... Full text Cite

Dependence of Cosmological Constraints on Gray Photometric Zero-point Uncertainties of Supernova Surveys

Journal Article Astrophysical Journal · February 1, 2023 Type Ia supernova (SN) measurements of the Hubble constant, H 0; cosmic mass density, ΩM ; and dark energy equation-of-state parameter, w, rely on heterogeneous SN surveys across three decades of observation. These distinct surveys may have undiagnosed, re ... Full text Cite

The Dark Energy Survey Supernova Program results: type Ia supernova brightness correlates with host galaxy dust

Journal Article Monthly Notices of the Royal Astronomical Society · January 1, 2023 Cosmological analyses with type Ia supernovae (SNe Ia) often assume a single empirical relation between colour and luminosity (β) and do not account for varying host-galaxy dust properties. However, from studies of dust in large samples of galaxies, it is ... Full text Cite

The Dark Energy Survey supernova program: Cosmological biases from supernova photometric classification

Journal Article Monthly Notices of the Royal Astronomical Society · January 1, 2023 Cosmological analyses of samples of photometrically identified type Ia supernovae (SNe Ia) depend on understanding the effects of 'contamination' from core-collapse and peculiar SN Ia events. We employ a rigorous analysis using the photometric classifier S ... Full text Cite

Designing an Optimal LSST Deep Drilling Program for Cosmology with Type Ia Supernovae

Journal Article Astrophysical Journal, Supplement Series · January 1, 2023 The Vera C. Rubin Observatory’s Legacy Survey of Space and Time (LSST) is forecast to collect a large sample of Type Ia supernovae (SNe Ia) expected to be instrumental in unveiling the nature of dark energy. The feat, however, requires accurately measuring ... Full text Cite

Using host galaxy spectroscopy to explore systematics in the standardization of Type Ia supernovae

Journal Article Monthly Notices of the Royal Astronomical Society · December 1, 2022 We use stacked spectra of the host galaxies of photometrically identified Type Ia supernovae (SNe Ia) from the Dark Energy Survey (DES) to search for correlations between Hubble diagram residuals and the spectral properties of the host galaxies. Utilizing ... Full text Cite

High-precision Redshifts for Type Ia Supernovae with the Nancy Grace Roman Space Telescope P127 Prism

Journal Article Astrophysical Journal · December 1, 2022 We present results from simulating slitless spectroscopic observations with the Nancy Grace Roman Space Telescope’s (Roman) Wide-Field Instrument P127 prism spanning from 0.75 to 1.8 μm. We quantify the efficiency of recovered Type Ia supernova (SN Ia) red ... Full text Cite

Dark Energy Survey Year 3 results: Cosmological constraints from galaxy clustering and galaxy-galaxy lensing using the MagLim lens sample

Journal Article Physical Review D · November 15, 2022 The cosmological information extracted from photometric surveys is most robust when multiple probes of the large scale structure of the Universe are used. Two of the most sensitive probes are the clustering of galaxies and the tangential shear of backgroun ... Full text Cite

Constraining RVvariation using highly reddened Type Ia supernovae from the Pantheon+ sample

Journal Article Monthly Notices of the Royal Astronomical Society · November 1, 2022 Type Ia supernovae (SNe Ia) are powerful tools for measuring the expansion history of the Universe, but the impact of dust around SNe Ia remains unknown and is a critical systematic uncertainty. One way to improve our empirical description of dust is to an ... Full text Cite

SALT3-NIR: Taking the Open-source Type Ia Supernova Model to Longer Wavelengths for Next-generation Cosmological Measurements

Journal Article Astrophysical Journal · November 1, 2022 A large fraction of Type Ia supernova (SN Ia) observations over the next decade will be in the near-infrared (NIR), at wavelengths beyond the reach of the current standard light-curve model for SN Ia cosmology, SALT3 (∼2800-8700 Å central filter wavelength ... Full text Cite

Absolute Calibration of Cepheid Period-Luminosity Relations in NGC 4258

Journal Article Astrophysical Journal · November 1, 2022 Owing to its accurate distance measured from water-maser motions, NGC 4258 is one of the most important anchors for calibrating the Cepheid period-luminosity relations (PLRs). We expand on previous efforts and carry out a new Cepheid search in this system ... Full text Cite

The Pantheon+ analysis: Improving the redshifts and peculiar velocities of Type Ia supernovae used in cosmological analyses

Journal Article Publications of the Astronomical Society of Australia · October 11, 2022 We examine the redshifts of a comprehensive set of published Type Ia supernovae, and provide a combined, improved catalogue with updated redshifts. We improve on the original catalogues by using the most up-to-date heliocentric redshift data available; ens ... Full text Cite

Measuring Cosmological Parameters with Type Ia Supernovae in redMaGiC Galaxies

Journal Article Astrophysical Journal · October 1, 2022 Current and future cosmological analyses with Type Ia supernovae (SNe Ia) face three critical challenges: (i) measuring the redshifts from the SNe or their host galaxies; (ii) classifying the SNe without spectra; and (iii) accounting for correlations betwe ... Full text Cite

The Pantheon+ Analysis: SuperCal-fragilistic Cross Calibration, Retrained SALT2 Light-curve Model, and Calibration Systematic Uncertainty

Journal Article Astrophysical Journal · October 1, 2022 We present a recalibration of the photometric systems in the Pantheon+ sample of Type Ia supernovae (SNe Ia) including those in the SH0ES distance-ladder measurement of H 0. We utilize the large and uniform sky coverage of the public Pan-STARRS stellar pho ... Full text Cite

Cluster Cepheids with High Precision Gaia Parallaxes, Low Zero-point Uncertainties, and Hubble Space Telescope Photometry

Journal Article Astrophysical Journal · October 1, 2022 We present Hubble Space Telescope (HST) photometry of 17 Cepheids in open clusters and their cluster mean parallaxes from Gaia EDR3. These parallaxes are more precise than those from individual Cepheids (G < 8 mag) previously used to measure the Hubble con ... Full text Cite

The Pantheon+ Analysis: Evaluating Peculiar Velocity Corrections in Cosmological Analyses with Nearby Type Ia Supernovae

Journal Article Astrophysical Journal · October 1, 2022 Separating the components of redshift due to expansion and peculiar motion in the nearby universe (z < 0.1) is critical for using Type Ia Supernovae (SNe Ia) to measure the Hubble constant (H 0) and the equation-of-state parameter of dark energy (w). Here, ... Full text Cite

The Pantheon+ Analysis: Cosmological Constraints

Journal Article Astrophysical Journal · October 1, 2022 We present constraints on cosmological parameters from the Pantheon+ analysis of 1701 light curves of 1550 distinct Type Ia supernovae (SNe Ia) ranging in redshift from z = 0.001 to 2.26. This work features an increased sample size from the addition of mul ... Full text Cite

The Pantheon+ Analysis: The Full Data Set and Light-curve Release

Journal Article Astrophysical Journal · October 1, 2022 Here we present 1701 light curves of 1550 unique, spectroscopically confirmed Type Ia supernovae (SNe Ia) that will be used to infer cosmological parameters as part of the Pantheon+ SN analysis and the Supernovae and H 0 for the Equation of State of dark e ... Full text Cite

Cosmicflows-4

Preprint · September 22, 2022 Link to item Cite

A galaxy-driven model of type Ia supernova luminosity variations

Journal Article Monthly Notices of the Royal Astronomical Society · September 1, 2022 Type Ia supernovae (SNe Ia) are used as standardizable candles to measure cosmological distances, but differences remain in their corrected luminosities which display a magnitude step as a function of host galaxy properties such as stellar mass and rest-fr ... Full text Cite

The dark energy survey 5-yr photometrically identified type Ia supernovae

Journal Article Monthly Notices of the Royal Astronomical Society · August 1, 2022 As part of the cosmology analysis using Type Ia Supernovae (SN Ia) in the Dark Energy Survey (DES), we present photometrically identified SN Ia samples using multiband light curves and host galaxy redshifts. For this analysis, we use the photometric classi ... Full text Cite

SNIa Cosmology Analysis Results from Simulated LSST Images: From Difference Imaging to Constraints on Dark Energy

Journal Article Astrophysical Journal · August 1, 2022 The Vera Rubin Observatory Legacy Survey of Space and Time (LSST) is expected to process ∼106 transient detections per night. For precision measurements of cosmological parameters and rates, it is critical to understand the detection efficiency, magnitude ... Full text Cite

Measurements of the Hubble Constant with a Two-rung Distance Ladder: Two out of Three Ain't Bad

Journal Article Astrophysical Journal · August 1, 2022 The three-rung distance ladder, which calibrates Type Ia supernovae (SNe Ia) through stellar distances linked to geometric measurements, provides the highest precision direct measurement of the Hubble constant. In light of the Hubble tension, it is importa ... Full text Cite

Cosmological Results from the RAISIN Survey: Using Type Ia Supernovae in the Near Infrared as a Novel Path to Measure the Dark Energy Equation of State

Journal Article Astrophysical Journal · July 1, 2022 Type Ia supernovae (SNe Ia) are more precise standardizable candles when measured in the near-infrared (NIR) than in the optical. With this motivation, from 2012 to 2017 we embarked on the RAISIN program with the Hubble Space Telescope (HST) to obtain rest ... Full text Cite

A Comprehensive Measurement of the Local Value of the Hubble Constant with 1 km s−1 Mpc−1 Uncertainty from the Hubble Space Telescope and the SH0ES Team

Journal Article The Astrophysical Journal Letters · July 1, 2022 AbstractWe report observations from the Hubble Space Telescope (HST) of Cepheid variables in the host galaxies of 42 Type Ia supernovae (SNe Ia) used to calibrate the Hubble constant (H Full text Cite

Cosmology intertwined: A review of the particle physics, astrophysics, and cosmology associated with the cosmological tensions and anomalies

Journal Article Journal of High Energy Astrophysics · June 1, 2022 The standard Λ Cold Dark Matter (ΛCDM) cosmological model provides a good description of a wide range of astrophysical and cosmological data. However, there are a few big open questions that make the standard model look like an approximation to a more real ... Full text Cite

The Impact of Observing Strategy on Cosmological Constraints with LSST

Journal Article Astrophysical Journal, Supplement Series · April 1, 2022 The generation-defining Vera C. Rubin Observatory will make state-of-the-art measurements of both the static and transient universe through its Legacy Survey for Space and Time (LSST). With such capabilities, it is immensely challenging to optimize the LSS ... Full text Cite

SOAR/Goodman Spectroscopic Assessment of Candidate Counterparts of the LIGO/Virgo Event GW190814

Journal Article Astrophysical Journal · April 1, 2022 On 2019 August 14 at 21:10:39 UTC, the LIGO/Virgo Collaboration (LVC) detected a possible neutron star-black hole merger (NSBH), the first ever identified. An extensive search for an optical counterpart of this event, designated GW190814, was undertaken us ... Full text Cite

Dark Energy Survey Year 3 results: Cosmological constraints from galaxy clustering and weak lensing

Journal Article Physical Review D · January 15, 2022 We present the first cosmology results from large-scale structure using the full 5000 deg2 of imaging data from the Dark Energy Survey (DES) Data Release 1. We perform an analysis of large-scale structure combining three two-point correlation functions (3× ... Full text Cite

OzDES reverberation mapping program: Lag recovery reliability for 6-yr C iv analysis

Journal Article Monthly Notices of the Royal Astronomical Society · January 1, 2022 We present the statistical methods that have been developed to analyse the OzDES reverberation mapping sample. To perform this statistical analysis we have created a suite of customizable simulations that mimic the characteristics of each source in the OzD ... Full text Cite

The Pantheon+ Analysis: Improving the Redshifts and Peculiar Velocities of Type Ia Supernovae Used in Cosmological Analyses

Journal Article · December 10, 2021 We examine the redshifts of a comprehensive set of published Type Ia supernovae, and provide a combined, improved catalog with updated redshifts. We improve on the original catalogs by using the most up-to-date heliocentric redshift data available; ensurin ... Open Access Link to item Cite

The Dark Energy Survey Supernova Program: Cosmological biases from supernova photometric classification

Journal Article · December 10, 2021 Cosmological analyses of samples of photometrically-identified Type Ia supernovae (SNe Ia) depend on understanding the effects of 'contamination' from core-collapse and peculiar SN Ia events. We employ a rigorous analysis on state-of-the-art simulations of ... Open Access Link to item Cite

The Pantheon+ Analysis: Forward-Modeling the Dust and Intrinsic Colour Distributions of Type Ia Supernovae, and Quantifying their Impact on Cosmological Inferences

Journal Article · December 10, 2021 Recent studies have shown that the observed colour distributions of Type Ia SNe (SNIa) are well-described by a combination of distributions from dust and intrinsic colour. Here we present a new forward-modeling fitting method (Dust2Dust) to measure the par ... Open Access Link to item Cite

The Pantheon+ Analysis: SuperCal-Fragilistic Cross Calibration, Retrained SALT2 Light Curve Model, and Calibration Systematic Uncertainty

Journal Article · December 10, 2021 We present here a re-calibration of the photometric systems used in the Pantheon+ sample of Type Ia supernovae (SNe Ia) including those used for the SH0ES distance-ladder measurement of H$_0$. We utilize the large and uniform sky coverage of the public Pan ... Open Access Link to item Cite

A Comprehensive Measurement of the Local Value of the Hubble Constant with 1 km/s/Mpc Uncertainty from the Hubble Space Telescope and the SH0ES Team

Journal Article · December 10, 2021 We report observations from HST of Cepheids in the hosts of 42 SNe Ia used to calibrate the Hubble constant (H0). These include all suitable SNe Ia in the last 40 years at z<0.01, measured with >1000 orbits, more than doubling the sample whose size limits ... Open Access Link to item Cite

The Pantheon+ Type Ia Supernova Sample: The Full Dataset and Light-Curve Release

Journal Article · December 10, 2021 Here we present 1701 light curves of spectroscopically confirmed Type Ia supernovae (SNe Ia) that will be used to infer cosmological parameters as part of the Pantheon+ SN analysis and the SH0ES (Supernovae and H0 for the Equation of State of dark energy) ... Open Access Link to item Cite

SNIa-Cosmology Analysis Results from Simulated LSST Images: from Difference Imaging to Constraints on Dark Energy

Journal Article · December 1, 2021 The Vera Rubin Observatory Legacy Survey of Space and Time (LSST) is expected to process ${\sim}10^6$ transient detections per night. For precision measurements of cosmological parameters and rates, it is critical to understand the detection efficiency, ma ... Open Access Link to item Cite

Optimization of the Observing Cadence for the Rubin Observatory Legacy Survey of Space and Time: a pioneering process of community-focused experimental design

Journal Article · November 12, 2021 Vera C. Rubin Observatory is a ground-based astronomical facility under construction, a joint project of the National Science Foundation and the U.S. Department of Energy, designed to conduct a multi-purpose 10-year optical survey of the southern hemispher ... Open Access Link to item Cite

SOAR/Goodman Spectroscopic Assessment of Candidate Counterparts of the LIGO--Virgo Event GW190814

Journal Article · November 10, 2021 On 2019 August 14 at 21:10:39 UTC, the LIGO/Virgo Collaboration (LVC) detected a possible neutron star-black hole merger (NSBH), the first ever identified. An extensive search for an optical counterpart of this event, designated GW190814, was undertaken us ... Open Access Link to item Cite

The Pantheon+ Analysis: Dependence of Cosmological Constraints on Photometric-Zeropoint Uncertainties of Supernova Surveys

Journal Article · November 10, 2021 Type Ia supernovae (SNe Ia) measurements of the Hubble constant, H$_0$, the cosmological mass density, $\Omega_M$, and the dark energy equation-of-state parameter, $w$, rely on numerous SNe surveys using distinct photometric systems across three decades of ... Open Access Link to item Cite

The Pantheon+ Analysis: Evaluating Peculiar Velocity Corrections in Cosmological Analyses with Nearby Type Ia Supernovae

Journal Article · November 10, 2021 Separating the components of redshift due to expansion and motion in the nearby universe ($z<0.1$) is critical for using Type Ia Supernovae (SNe Ia) to measure the Hubble constant ($H_0$) and the equation-of-state parameter of dark energy ($w$). Here, we s ... Open Access Link to item Cite

A Reference Survey for Supernova Cosmology with the Nancy Grace Roman Space Telescope

Journal Article · November 10, 2021 This note presents an initial survey design for the Nancy Grace Roman High-latitude Time Domain Survey. This is not meant to be a final or exhaustive list of all the survey strategy choices, but instead presents a viable path towards achieving the desired ... Open Access Link to item Cite

Rates and delay times of Type Ia supernovae in the Dark Energy Survey

Journal Article Monthly Notices of the Royal Astronomical Society · September 1, 2021 We use a sample of 809 photometrically classified Type Ia supernovae (SNe Ia) discovered by the Dark Energy Survey (DES) along with 40 415 field galaxies to calculate the rate of SNe Ia per galaxy in the redshift range 0.2 < z < 0.6. We recover the known c ... Full text Cite

Cosmology with the Roman Space Telescope – multiprobe strategies

Journal Article Monthly Notices of the Royal Astronomical Society · August 27, 2021 ABSTRACTWe simulate the scientific performance of the Nancy Grace Roman Space Telescope High Latitude Survey (HLS) on dark energy and modified gravity. The 1.6-yr HLS Reference survey is currently envisioned ... Full text Open Access Cite

SALT3: An Improved Type Ia Supernova Model for Measuring Cosmic Distances

Journal Article · August 24, 2021 A spectral-energy distribution (SED) model for Type Ia supernovae (SNe Ia) is a critical tool for measuring precise and accurate distances across a large redshift range and constraining cosmological parameters. We present an improved model framework, SALT3 ... Open Access Link to item Cite

The Dark Energy Survey supernova programme: Modelling selection efficiency and observed core-collapse supernova contamination

Journal Article Monthly Notices of the Royal Astronomical Society · August 1, 2021 The analysis of current and future cosmological surveys of Type Ia supernovae (SNe Ia) at high redshift depends on the accurate photometric classification of the SN events detected. Generating realistic simulations of photometric SN surveys constitutes an ... Full text Open Access Cite

The Impact of Observing Strategy on Cosmological Constraints with LSST

Journal Article · July 14, 2021 The generation-defining Vera C. Rubin Observatory will make state-of-the-art measurements of both the static and transient universe through its Legacy Survey for Space and Time (LSST). With such capabilities, it is immensely challenging to optimize the LSS ... Open Access Link to item Cite

Improved Treatment of Host-galaxy Correlations in Cosmological Analyses with Type Ia Supernovae

Journal Article Astrophysical Journal · May 20, 2021 Improving the use of Type Ia supernovae (SNe Ia) as standard candles requires a better approach to incorporate the relationship between SNe Ia and the properties of their host galaxies. Using a spectroscopically confirmed sample of ∼1600 SNe Ia, we develop ... Full text Cite

Synergies between Vera C. Rubin Observatory, Nancy Grace Roman Space Telescope, and Euclid Mission: Constraining Dark Energy with Type Ia Supernovae

Journal Article · May 12, 2021 We review the needs of the supernova community for improvements in survey coordination and data sharing that would significantly boost the constraints on dark energy using samples of Type Ia supernovae from the Vera C. Rubin Observatories, the \textit{Nanc ... Open Access Link to item Cite

Binning is Sinning (Supernova Version): The Impact of Self-calibration in Cosmological Analyses with Type Ia Supernovae

Journal Article Astrophysical Journal Letters · May 10, 2021 Recent cosmological analyses (e.g., JLA, Pantheon) of Type Ia supernovae (SNe Ia) have propagated systematic uncertainties into a covariance matrix and either binned or smoothed the systematic uncertainty vectors in redshift space. We demonstrate that syst ... Full text Open Access Cite

The Foundation Supernova Survey: Photospheric Velocity Correlations in Type Ia Supernovae

Journal Article · May 5, 2021 The ejecta velocities of type-Ia supernovae (SNe Ia), as measured by the Si II $\lambda 6355$ line, have been shown to correlate with other supernova properties, including color and standardized luminosity. We investigate these results using the Foundation ... Open Access Link to item Cite

The first Hubble diagram and cosmological constraints using superluminous supernovae

Journal Article Monthly Notices of the Royal Astronomical Society · April 30, 2021 ABSTRACTWe present the first Hubble diagram of superluminous supernovae (SLSNe) out to a redshift of two, together with constraints on the matter density, ΩM, and the dark energy equation-of-state parameter, ... Full text Cite

Understanding type ia supernova distance biases by simulating spectral variations

Journal Article Astrophysical Journal · April 20, 2021 In the next decade, transient searches from the Vera C. Rubin Observatory and the Nancy Grace Roman Space Telescope will increase the sample of known Type Ia supernovae (SNe Ia) from ∼103 to 105. With this reduction of statistical uncertainties on cosmolog ... Full text Open Access Cite

The LSST DESC DC2 simulated sky survey

Journal Article Astrophysical Journal, Supplement Series · March 12, 2021 We describe the simulated sky survey underlying the second data challenge (DC2) carried out in preparation for analysis of the Vera C. Rubin Observatory Legacy Survey of Space and Time (LSST) by the LSST Dark Energy Science Collaboration (LSST DESC). Signi ... Full text Cite

It’s Dust: Solving the Mysteries of the Intrinsic Scatter and Host-galaxy Dependence of Standardized Type Ia Supernova Brightnesses

Journal Article The Astrophysical Journal · March 1, 2021 AbstractThe use of Type Ia supernovae (SNe Ia) as cosmological tools has motivated significant effort to understand what drives the intrinsic scatter of SN Ia distance modulus residuals after standardization ... Full text Open Access Cite

Cosmic distances calibrated to 1% precision with gaia EDR3 parallaxes and hubble space telescope photometry of 75 milky way cepheids confirm tension with ΛCDM

Journal Article Astrophysical Journal Letters · February 10, 2021 We present an expanded sample of 75 Milky Way Cepheids with Hubble Space Telescope (HST) photometry and Gaia EDR3 parallaxes, which we use to recalibrate the extragalactic distance ladder and refine the determination of the Hubble constant. All HST observa ... Full text Open Access Cite

DES Y1 results: Splitting growth and geometry to test

Journal Article Physical Review D · January 21, 2021 Full text Cite

The effect of environment on Type Ia supernovae in the Dark Energy Survey three-year cosmological sample

Journal Article Monthly Notices of the Royal Astronomical Society · January 19, 2021 ABSTRACTAnalyses of Type Ia supernovae (SNe Ia) have found puzzling correlations between their standardized luminosities and host galaxy properties: SNe Ia in high-mass, passive hosts appear brighter than th ... Full text Cite

First cosmology results using supernovae ia from the dark energy survey: Survey overview, performance, and supernova spectroscopy

Journal Article Astronomical Journal · December 1, 2020 We present details on the observing strategy, data-processing techniques, and spectroscopic targeting algorithms for the first three years of operation for the Dark Energy Survey Supernova Program (DES-SN). This five-year program using the Dark Energy Came ... Full text Cite

SuperRAENN: A Semisupervised Supernova Photometric Classification Pipeline Trained on Pan-STARRS1 Medium-Deep Survey Supernovae

Journal Article The Astrophysical Journal · December 1, 2020 AbstractAutomated classification of supernovae (SNe) based on optical photometric light-curve information is essential in the upcoming era of wide-field time domain surveys, such as the Legacy Survey of Spac ... Full text Cite

Windowing artefacts likely account for recent claimed detection of oscillating cosmic scale factor

Journal Article Monthly Notices of the Royal Astronomical Society · November 1, 2020 Using the Pantheon data set of Type Ia supernovae, a recent publication (R20 in this work) reports a 2σ detection of oscillations in the expansion history of the Universe. The study conducted by R20 is wholly worthwhile. However, we demonstrate that there ... Full text Cite

A DESGW Search for the Electromagnetic Counterpart to the LIGO/Virgo Gravitational-wave Binary Neutron Star Merger Candidate S190510g

Journal Article Astrophysical Journal · November 1, 2020 We present the results from a search for the electromagnetic counterpart of the LIGO/Virgo event S190510g using the Dark Energy Camera (DECam). S190510g is a binary neutron star (BNS) merger candidate of moderate significance detected at a distance of 227 ... Full text Cite

Optical follow-up of gravitational wave triggers with DECam during the first two LIGO/VIRGO observing runs

Journal Article Astronomy and Computing · October 1, 2020 Gravitational wave (GW) events detectable by LIGO and Virgo have several possible progenitors, including black hole mergers, neutron star mergers, black hole–neutron star mergers, supernovae, and cosmic string cusps. A subset of GW events is expected to pr ... Full text Open Access Cite

Constraints on the Physical Properties of GW190814 through Simulations Based on DECam Follow-up Observations by the Dark Energy Survey

Journal Article The Astrophysical Journal · September 1, 2020 AbstractOn 2019 August 14, the LIGO and Virgo Collaborations detected gravitational waves from a black hole and a 2.6 solar mass compact object, possibly the first neutron star–black hole merger. In search o ... Full text Cite

The Accuracy of the Hubble Constant Measurement Verified through Cepheid Amplitudes

Journal Article Astrophysical Journal Letters · June 20, 2020 The accuracy of the Hubble constant measured with extragalactic Cepheids depends on robust photometry and background estimation in the presence of stellar crowding. The conventional approach accounts for crowding by sampling backgrounds near Cepheids and a ... Full text Cite

OzDES multi-object fibre spectroscopy for the Dark Energy Survey: Results and second data release

Journal Article Monthly Notices of the Royal Astronomical Society · June 11, 2020 We present a description of the Australian Dark Energy Survey (OzDES) and summarize the results from its 6 years of operations. Using the 2dF fibre positioner and AAOmega spectrograph on the 3.9-m Anglo-Australian Telescope, OzDES has monitored 771 active ... Full text Cite

Supernova Siblings: Assessing the Consistency of Properties of Type Ia Supernovae that Share the Same Parent Galaxies

Journal Article Astrophysical Journal Letters · June 10, 2020 While many studies have shown a correlation between properties of the light curves of SNe Ia and properties of their host galaxies, it remains unclear what is driving these correlations. We introduce a new direct method to study these correlations by analy ... Full text Open Access Cite

Evidence for Cosmic Acceleration Is Robust to Observed Correlations between Type Ia Supernova Luminosity and Stellar Age

Journal Article Astrophysical Journal Letters · June 10, 2020 Type Ia supernovae (SNe Ia) are powerful standardizable candles for constraining cosmological models and provided the first evidence of the accelerated expansion of the universe. Their precision derives from empirical correlations, now measured from >1000 ... Full text Open Access Cite

STRIDES: a 3.9 per cent measurement of the Hubble constant from the strong lens system DES J0408-5354

Journal Article Monthly Notices of the Royal Astronomical Society · June 1, 2020 We present a blind time-delay cosmographic analysis for the lens system DES J0408-5354. This system is extraordinary for the presence of two sets of multiple images at different redshifts, which provide the opportunity to obtain more information at the cos ... Full text Cite

The mystery of photometric twins DES17X1boj and DES16E2bjy

Journal Article Monthly Notices of the Royal Astronomical Society · June 1, 2020 We present an analysis of DES17X1boj and DES16E2bjy, two peculiar transients discovered by the Dark Energy Survey (DES). They exhibit nearly identical double-peaked light curves that reach very different maximum luminosities (Mr = -15.4 and -17.9, respecti ... Full text Cite

Cosmological Model Insensitivity of Local H 0 from the Cepheid Distance Ladder

Journal Article Astrophysical Journal · May 1, 2020 The observed tension (∼9% difference) between the local distance ladder measurement of the Hubble constant, H 0, and its value inferred from the cosmic microwave background could hint at new, exotic, cosmological physics. We test the impact of the assumpti ... Full text Open Access Cite

The Megamaser Cosmology Project. XIII. Combined Hubble Constant Constraints

Journal Article Astrophysical Journal Letters · March 1, 2020 We present a measurement of the Hubble constant made using geometric distance measurements to megamaser-hosting galaxies. We have applied an improved approach for fitting maser data and obtained better distance estimates for four galaxies previously publis ... Full text Cite

Assessment of Systematic Uncertainties in the Cosmological Analysis of the SDSS Supernovae Photometric Sample

Journal Article Astrophysical Journal · February 20, 2020 Improvements to the precision of measurements of cosmological parameters with Type Ia supernovae (SNe Ia) are expected to come from large photometrically identified (photometric) supernova (SN) samples. Here we reanalyze the Sloan Digital Sky Survey (SDSS) ... Full text Cite

Hubble Space Telescope Observations of Mira Variables in the SN Ia Host NGC 1559: An Alternative Candle to Measure the Hubble Constant

Journal Article Astrophysical Journal · January 20, 2020 We present year-long, near-infrared Hubble Space Telescope (HST) WFC3 observations used to search for Mira variables in NGC 1559, the host galaxy of the Type Ia supernova (SN Ia) SN 2005df. This is the first dedicated search for Miras, highly evolved low-m ... Full text Cite

Supernova host galaxies in the dark energy survey: I. Deep coadds, photometry, and stellar masses

Journal Article Monthly Notices of the Royal Astronomical Society · January 1, 2020 The 5-yr Dark Energy Survey Supernova Programme (DES-SN) is one of the largest and deepest transient surveys to date in terms of volume and number of supernovae. Identifying and characterizing the host galaxies of transients plays a key role in their class ... Full text Open Access Cite

First cosmology results using type Ia supernovae from the dark energy survey: The effect of host galaxy properties on supernova luminosity

Journal Article Monthly Notices of the Royal Astronomical Society · January 1, 2020 We present improved photometric measurements for the host galaxies of 206 spectroscopically confirmed type Ia supernovae discovered by the Dark Energy Survey Supernova Program (DES-SN) and used in the first DES-SN cosmological analysis. For the DES-SN samp ... Full text Open Access Cite

The host galaxies of 106 rapidly evolving transients discovered by the Dark Energy Survey

Journal Article Monthly Notices of the Royal Astronomical Society · January 1, 2020 Rapidly evolving transients (RETs), also termed fast blue optical transients, are a recently discovered group of astrophysical events that display rapid luminosity evolution. RETs typically rise to peak in less than 10 d and fade within 30, a time-scale un ... Full text Cite

Studying type II supernovae as cosmological standard candles using the Dark Energy Survey

Journal Article Monthly Notices of the Royal Astronomical Society · January 1, 2020 Despite vast improvements in the measurement of the cosmological parameters, the nature of dark energy and an accurate value of the Hubble constant (H0) in the Hubble–Lemaître law remain unknown. To break the current impasse, it is necessary to develop as ... Full text Cite

Weak lensing of Type Ia Supernovae from the Dark Energy Survey

Journal Article Monthly Notices of the Royal Astronomical Society · January 1, 2020 We consider the effects of weak gravitational lensing on observations of 196 spectroscopically confirmed Type Ia Supernovae (SNe Ia) from years 1 to 3 of the Dark Energy Survey (DES).We simultaneously measure both the angular correlation function and the n ... Full text Cite

Consistent calibration of the tip of the red giant branch in the large magellanic cloud on the hubble space telescope photometric system and a redetermination of the hubble constant

Journal Article Astrophysical Journal · November 20, 2019 We present a calibration of the tip of the red giant branch (TRGB) in the Large Magellanic Cloud (LMC) on the Hubble Space Telescope (HST)/ACS F814W system. We use archival HST observations to derive blending corrections and photometric transformations for ... Full text Cite

Supernova Photometric Classification Pipelines Trained on Spectroscopically Classified Supernovae from the Pan-STARRS1 Medium-deep Survey

Journal Article Astrophysical Journal · October 10, 2019 Photometric classification of supernovae (SNe) is imperative as recent and upcoming optical time-domain surveys, such as the Large Synoptic Survey Telescope (LSST), overwhelm the available resources for spectrosopic follow-up. Here we develop a range of li ... Full text Cite

A DECam Search for Explosive Optical Transients Associated with IceCube Neutrino Alerts

Journal Article Astrophysical Journal · October 1, 2019 In this work, we investigate the likelihood of association between real-time, neutrino alerts with teraelectronvolt to petaelectronvolt energy from IceCube and optical counterparts in the form of core-collapse supernovae (CC SNe). The optical follow-up of ... Full text Cite

Eleanor: An open-source tool for extracting light curves from the TESS full-frame images

Journal Article Publications of the Astronomical Society of the Pacific · September 1, 2019 During its two-year prime mission, the Transiting Exoplanet Survey Satellite (TESS) will perform a time-series photometric survey covering over 80% of the sky. This survey comprises observations of 26 24°×96° sectors that are each monitored continuously fo ... Full text Cite

ATLAS Probe: Breakthrough Science of Galaxy Evolution, Cosmology, Milky Way, and the Solar System

Journal Article · August 30, 2019 ATLAS (Astrophysics Telescope for Large Area Spectroscopy) is a concept for a NASA probe-class space mission. It is the spectroscopic follow-up mission to WFIRST, boosting its scientific return by obtaining deep NIR & MIR slit spectroscopy for most of the ... Link to item Cite

PS1-13cbe: The rapid transition of a Seyfert 2 to a Seyfert 1

Journal Article Monthly Notices of the Royal Astronomical Society · August 11, 2019 We present a nuclear transient event, PS1-13cbe, that was first discovered in the Pan-STARRS1 survey in 2013. The outburst occurred in the nucleus of the galaxy SDSS J222153.87+003054.2 at z = 0.123 55, which was classified as a Seyfert 2 in a pre-outburst ... Full text Cite

The Foundation Supernova Survey: Measuring Cosmological Parameters with Supernovae from a Single Telescope

Journal Article Astrophysical Journal · August 10, 2019 Measurements of the dark energy equation-of-state parameter, w, have been limited by uncertainty in the selection effects and photometric calibration of z < 0.1 Type Ia supernovae (SNe Ia). The Foundation Supernova Survey is designed to lower these uncerta ... Full text Cite

PS1-13cbe: The Rapid "Turn on" of a Seyfert 1

Journal Article Monthly Notices of the Royal Astronomical Society · June 15, 2019 We present a nuclear transient event, PS1-13cbe, that was first discovered in the Pan-STARRS1 survey in 2013. The outburst occurred in the nucleus of the galaxy SDSS J222153.87+003054.2 at $z = 0.12355$, which was classified as a Seyfert 2 in a pre-outburs ... Link to item Cite

Photometric Redshift Calibration Requirements for WFIRST Weak-lensing Cosmology: Predictions from CANDELS

Journal Article Astrophysical Journal · June 1, 2019 In order for the Wide-Field Infrared Survey Telescope (WFIRST) and other stage IV dark energy experiments (e.g., Large Synoptic Survey Telescope, LSST; and Euclid) to infer cosmological parameters not limited by systematic errors, accurate redshift measure ... Full text Cite

First cosmological results using Type Ia supernovae from the Dark Energy Survey: Measurement of the Hubble constant

Journal Article Monthly Notices of the Royal Astronomical Society · June 1, 2019 We present an improved measurement of the Hubble constant (H0) using the 'inverse distance ladder' method, which adds the information from 207 Type Ia supernovae (SNe Ia) from the Dark Energy Survey (DES) at redshift 0.018 Full text Cite

Steve: A Hierarchical Bayesian Model for Supernova Cosmology

Journal Article Astrophysical Journal · May 1, 2019 We present a new Bayesian hierarchical model (BHM) named Steve for performing Type Ia supernova (SN Ia) cosmology fits. This advances previous works by including an improved treatment of Malmquist bias, accounting for additional sources of systematic uncer ... Full text Cite

First cosmology results using Type Ia supernova from the Dark Energy Survey: Simulations to correct supernova distance biases

Journal Article Monthly Notices of the Royal Astronomical Society · May 1, 2019 We describe catalogue-level simulations of Type Ia supernova (SN Ia) light curves in the Dark Energy Survey Supernova Program (DES-SN) and in low-redshift samples from the Center for Astrophysics (CfA) and the Carnegie Supernova Project (CSP). These simula ... Full text Cite

Large Magellanic Cloud Cepheid Standards Provide a 1% Foundation for the Determination of the Hubble Constant and Stronger Evidence for Physics beyond ΛcDM

Journal Article Astrophysical Journal · May 1, 2019 We present an improved determination of the Hubble constant from Hubble Space Telescope (HST) observations of 70 long-period Cepheids in the Large Magellanic Cloud (LMC). These were obtained with the same WFC3 photometric system used to measure extragalact ... Full text Cite

Enhancing LSST Science with Euclid Synergy

Journal Article · April 23, 2019 This white paper is the result of the Tri-Agency Working Group (TAG) appointed to develop synergies between missions and is intended to clarify what LSST observations are needed in order to maximally enhance the combined science output of LSST and Euclid. ... Link to item Cite

The Local Perspective on the Hubble Tension: Local Structure Does Not Impact Measurement of the Hubble Constant

Journal Article Astrophysical Journal · April 20, 2019 We use the largest sample to date of spectroscopic supernova (SN) Ia distances and redshifts to look for evidence in the Hubble diagram of large-scale outflows caused by local voids suggested to exist at z < 0.15. Our sample combines data from the Pantheon ... Full text Cite

Constraining Temporal Oscillations of Cosmological Parameters Using SNe Ia

Journal Article Astrophysical Journal · April 10, 2019 The existing set of SNe Ia is now sufficient to detect oscillatory deviations from the canonical ΛCDM cosmology. We determine that the Fourier spectrum of the Pantheon data set of spectroscopically well-observed SNe Ia is consistent with the predictions of ... Full text Cite

LSST Target-of-opportunity Observations of Gravitational-wave Events: Essential and Efficient

Journal Article Astrophysical Journal · March 20, 2019 We present simulated observations to assess the ability of the Large Synoptic Survey Telescope (LSST) and the wide-fast-deep (WFD) survey to detect and characterize kilonovae - the optical emission associated with binary neutron star (and possibly black ho ... Full text Cite

First Cosmology Results Using Type Ia Supernovae from the Dark Energy Survey: Photometric Pipeline and Light-curve Data Release

Journal Article Astrophysical Journal · March 20, 2019 We present griz light curves of 251 SNe Ia from the first 3 years of the Dark Energy Survey Supernova Program's (DES-SN) spectroscopically classified sample. The photometric pipeline described in this paper produces the calibrated fluxes and associated unc ... Full text Cite

An Ultra Deep Field survey with WFIRST

Journal Article · March 14, 2019 Studying the formation and evolution of galaxies at the earliest cosmic times, and their role in reionization, requires the deepest imaging possible. Ultra-deep surveys like the HUDF and HFF have pushed to mag \mAB$\,\sim\,$30, revealing galaxies at the fa ... Link to item Cite

First cosmology results using Type IA supernovae from the dark energy survey: Effects of chromatic corrections to supernova photometry on measurements of cosmological parameters

Journal Article Monthly Notices of the Royal Astronomical Society · March 13, 2019 Calibration uncertainties have been the leading systematic uncertainty in recent analyses using Type Ia supernovae (SNe Ia) to measure cosmological parameters. To improve the calibration, we present the application of spectral energy distribution-dependent ... Full text Cite

WFIRST: Enhancing Transient Science and Multi-Messenger Astronomy

Journal Article · March 11, 2019 Astrophysical transients have been observed for millennia and have shaped our most basic assumptions about the Universe. In the last century, systematic searches have grown from detecting handfuls of transients per year to over 7000 in 2018 alone. As these ... Link to item Cite

Prospects for Resolving the Hubble Constant Tension with Standard Sirens.

Journal Article Physical review letters · February 2019 The Hubble constant (H_{0}) estimated from the local Cepheid-supernova distance ladder is in 3-σ tension with the value extrapolated from cosmic microwave background (CMB) data assuming the standard cosmological model. Whether this tension represents new p ... Full text Cite

The Wide Field Infrared Survey Telescope: 100 Hubbles for the 2020s

Journal Article arXiv e-prints · February 2019 Cite

Dark Energy Survey year 1 results: Galaxy sample for BAO measurement

Journal Article Monthly Notices of the Royal Astronomical Society · January 11, 2019 We define and characterize a sample of 1.3 million galaxies extracted from the first year of Dark Energy Survey data, optimized to measure baryon acoustic oscillations (BAO) in the presence of significant redshift uncertainties. The sample is dominated by ... Full text Cite

LSST Target of Opportunity proposal for locating a core collapse supernova in our galaxy triggered by a neutrino supernova alert

Journal Article · January 6, 2019 A few times a century, a core collapse supernova (CCSN) occurs in our galaxy. When such galactic CCSNe happen, over 99\% of its gravitational binding energy is released in the form of neutrinos. Over a period of tens of seconds, a powerful neutrino flux is ... Link to item Cite

ATLAS probe: Breakthrough science of galaxy evolution, cosmology, Milky Way, and the Solar System

Journal Article Publications of the Astronomical Society of Australia · January 1, 2019 Astrophysics Telescope for Large Area Spectroscopy Probe is a concept for a National Aeronautics and Space Administration probe-class space mission that will achieve ground-breaking science in the fields of galaxy evolution, cosmology, Milky Way, and the S ... Full text Cite

K2 Observations of SN 2018oh Reveal a Two-component Rising Light Curve for a Type Ia Supernova

Journal Article Astrophysical Journal Letters · January 1, 2019 We present an exquisite 30 minute cadence Kepler (K2) light curve of the Type Ia supernova (SN Ia) 2018oh (ASASSN-18bt), starting weeks before explosion, covering the moment of explosion and the subsequent rise, and continuing past peak brightness. These d ... Full text Cite

Target of Opportunity Observations of Gravitational Wave Events with LSST

Journal Article · December 10, 2018 The discovery of the electromagnetic counterparts to the binary neutron star merger GW170817 has opened the era of GW+EM multi-messenger astronomy. Exploiting this breakthrough requires increasing samples to explore the diversity of kilonova behaviour and ... Link to item Cite

The Dark Energy Survey: Data Release 1

Journal Article \apjs · December 2018 Full text Cite

LSST Observing Strategy White Paper: LSST Observations of WFIRST Deep Fields

Journal Article · November 30, 2018 The Wide-Field Infrared Survey Telescope (WFIRST) is expected to launch in the mid-2020s. With its wide-field near-infrared (NIR) camera, it will survey the sky to unprecedented detail. As part of normal operations and as the result of multiple expected de ... Link to item Cite

Optimizing the LSST Observing Strategy for Dark Energy Science: DESC Recommendations for the Deep Drilling Fields and other Special Programs

Journal Article · November 15, 2018 We review the measurements of dark energy enabled by observations of the Deep Drilling Fields and the optimization of survey design for cosmological measurements. This white paper is the result of efforts by the LSST DESC Observing Strategy Task Force (OST ... Link to item Cite

Optimizing the LSST Observing Strategy for Dark Energy Science: DESC Recommendations for the Wide-Fast-Deep Survey

Journal Article · November 15, 2018 Cosmology is one of the four science pillars of LSST, which promises to be transformative for our understanding of dark energy and dark matter. The LSST Dark Energy Science Collaboration (DESC) has been tasked with deriving constraints on cosmological para ... Link to item Cite

Should Type Ia Supernova Distances Be Corrected for Their Local Environments?

Journal Article Astrophysical Journal · November 10, 2018 Recent analyses suggest that distance residuals measured from Type Ia supernovae (SNe Ia) are correlated with local host galaxy properties within a few kiloparsecs of the SN explosion. However, the well-established correlation with global host galaxy prope ... Full text Cite

Extending supernova spectral templates for next-generation space telescope observations

Journal Article Publications of the Astronomical Society of the Pacific · November 1, 2018 Empirical models of supernova (SN) spectral energy distributions (SEDs) are widely used for SN survey simulations and photometric classifications. The existing library of SED models has excellent optical templates, but limited, poorly constrained coverage ... Full text Cite

Simulations of the WFIRST Supernova Survey and Forecasts of Cosmological Constraints

Journal Article Astrophysical Journal · November 1, 2018 The Wide Field InfraRed Survey Telescope (WFIRST) was the highest-ranked large space-based mission of the 2010 New Worlds, New Horizons decadal survey. It is now a NASA mission in formulation with a planned launch in the mid 2020s. A primary mission object ... Full text Cite

Seven Problems with the Claims Related to the Hubble Tension in arXiv:1810.02595

Journal Article · October 8, 2018 Shanks et al. (2018) arXiv:1810.02595 make two claims that they argue bring the local measurement and early Universe prediction of H0 into agreement: A) they claim that Gaia DR2 parallax measurements show the geometric calibration of the Cepheid distance s ... Link to item Cite

The Complete Light-curve Sample of Spectroscopically Confirmed SNe Ia from Pan-STARRS1 and Cosmological Constraints from the Combined Pantheon Sample

Journal Article Astrophysical Journal · June 1, 2018 We present optical light curves, redshifts, and classifications for 365 spectroscopically confirmed Type Ia supernovae (SNe Ia) discovered by the Pan-STARRS1 (PS1) Medium Deep Survey. We detail improvements to the PS1 SN photometry, astrometry, and calibra ... Full text Cite

The cosmic transparency measured with Type Ia supernovae: Implications for intergalactic dust

Journal Article Monthly Notices of the Royal Astronomical Society: Letters · June 1, 2018 Observations of high-redshift Type Ia supernovae (SNe Ia) are used to study the cosmic transparency at optical wavelengths. Assuming a flat Λ cold dark matter (ΛCDM) cosmological model based on baryon acoustic oscillations and cosmic microwave background m ... Full text Cite

An Empirical Study of Contamination in Deep, Rapid, and Wide-field Optical Follow-up of Gravitational Wave Events

Journal Article Astrophysical Journal · May 1, 2018 We present an empirical study of contamination in wide-field optical follow-up searches of gravitational wave sources from Advanced LIGO/Virgo using dedicated observations with the Dark Energy Camera. Our search covered ∼56 deg2, with two visits per night, ... Full text Cite

Measuring Dark Energy Properties with Photometrically Classified Pan-STARRS Supernovae. II. Cosmological Parameters

Journal Article Astrophysical Journal · April 10, 2018 We use 1169 Pan-STARRS supernovae (SNe) and 195 low-z (z < 0.1) SNe Ia to measure cosmological parameters. Though most Pan-STARRS SNe lack spectroscopic classifications, in a previous paper we demonstrated that photometrically classified SNe can be used to ... Full text Cite

The Foundation Supernova Survey: Motivation, design, implementation, and first data release

Journal Article Monthly Notices of the Royal Astronomical Society · March 21, 2018 The Foundation Supernova Survey aims to provide a large, high-fidelity, homogeneous, and precisely calibrated low-redshift Type Ia supernova (SN Ia) sample for cosmology. The calibration of the current low-redshift SN sample is the largest component of sys ... Full text Cite

Type Ia Supernova Distances at Redshift >1.5 from the Hubble Space Telescope Multi-cycle Treasury Programs: The Early Expansion Rate

Journal Article Astrophysical Journal · February 1, 2018 We present an analysis of 15 Type Ia supernovae (SNe Ia) at redshift z > 1 (9 at 1.5 < z < 2.3) recently discovered in the CANDELS and CLASH Multi-Cycle Treasury programs using WFC3 on the Hubble Space Telescope. We combine these SNe Ia with a new compilat ... Full text Cite

Hydrogen-poor Superluminous Supernovae from the Pan-STARRS1 Medium Deep Survey

Journal Article Astrophysical Journal · January 10, 2018 We present light curves and classification spectra of 17 hydrogen-poor superluminous supernovae (SLSNe) from the Pan-STARRS1 Medium Deep Survey (PS1 MDS). Our sample contains all objects from the PS1 MDS sample with spectroscopic classification that are si ... Full text Cite

Forward Global Photometric Calibration of the Dark Energy Survey

Journal Article Astronomical Journal · January 1, 2018 Many scientific goals for the Dark Energy Survey (DES) require the calibration of optical/NIR broadband b = grizY photometry that is stable in time and uniform over the celestial sky to one percent or better. It is also necessary to limit to similar accura ... Full text Cite

How Many Kilonovae Can Be Found in Past, Present, and Future Survey Data Sets?

Journal Article Astrophysical Journal Letters · January 1, 2018 The discovery of a kilonova (KN) associated with the Advanced LIGO (aLIGO)/Virgo event GW170817 opens up new avenues of multi-messenger astrophysics. Here, using realistic simulations, we provide estimates of the number of KNe that could be found in data f ... Full text Cite

The Dark Energy Survey and operations: Years 4 and 5

Conference Proceedings of SPIE - The International Society for Optical Engineering · January 1, 2018 The Dark Energy Survey (DES) is an operating optical survey aimed at understanding the accelerating expansion of the universe using four complementary methods: weak gravitational lensing, galaxy cluster counts, baryon acoustic oscillations, and Type Ia sup ... Full text Cite

Improved Constraints on H 0 from a Combined Analysis of Gravitational-wave and Electromagnetic Emission from GW170817

Journal Article Astrophysical Journal Letters · December 20, 2017 The luminosity distance measurement of GW170817 derived from gravitational-wave analysis in Abbott et al. (2017a, hereafter A17:H0) is highly correlated with the measured inclination of the NS-NS system. To improve the precision of the distance measurement ... Full text Cite

Evidence for Dynamically Driven Formation of the GW170817 Neutron Star Binary in NGC 4993

Journal Article Astrophysical Journal Letters · November 10, 2017 We present a study of NGC 4993, the host galaxy of the GW170817 gravitational-wave event, the GRB 170817A short gamma-ray burst (sGRB), and the AT 2017gfo kilonova. We use Dark Energy Camera imaging, AAT spectra, and publicly available data, relating our f ... Full text Cite

OzDES multifibre spectroscopy for the Dark Energy Survey: 3-yr results and first data release

Journal Article Monthly Notices of the Royal Astronomical Society · November 1, 2017 We present results for the first three years of OzDES, a six year programme to obtain redshifts for objects in the Dark Energy Survey (DES) supernova fields using the 2dF fibre positioner and AAOmega spectrograph on the Anglo-Australian Telescope. OzDES is ... Full text Cite

The Electromagnetic Counterpart of the Binary Neutron Star Merger LIGO/Virgo GW170817. IV. Detection of Near-infrared Signatures of r-process Nucleosynthesis with Gemini-South

Journal Article Astrophysical Journal Letters · October 20, 2017 We present a near-infrared spectral sequence of the electromagnetic counterpart to the binary neutron star merger GW170817 detected by Advanced Laser Interferometer Gravitational-wave Observatory (LIGO)/Virgo. Our data set comprises seven epochs of J+H spe ... Full text Cite

Measuring the Properties of Dark Energy with Photometrically Classified Pan-STARRS Supernovae. I. Systematic Uncertainty from Core-collapse Supernova Contamination

Journal Article Astrophysical Journal · July 1, 2017 The Pan-STARRS (PS1) Medium Deep Survey discovered over 5000 likely supernovae (SNe) but obtained spectral classifications for just 10% of its SN candidates. We measured spectroscopic host galaxy redshifts for 3147 of these likely SNe and estimate that ∼10 ... Full text Cite

The Type Ia Supernova Color-Magnitude Relation and Host Galaxy Dust: A Simple Hierarchical Bayesian Model

Journal Article Astrophysical Journal · June 20, 2017 Conventional Type Ia supernova (SN Ia) cosmology analyses currently use a simplistic linear regression of magnitude versus color and light curve shape, which does not model intrinsic SN Ia variations and host galaxy dust as physically distinct effects, res ... Full text Cite

Testing Λ CDM at the lowest redshifts with SN Ia and galaxy velocities

Journal Article Journal of Cosmology and Astroparticle Physics · May 5, 2017 Peculiar velocities of objects in the nearby universe are correlated due to the gravitational pull of large-scale structure. By measuring these velocities, we have a unique opportunity to test the cosmological model at the lowest redshifts. We perform this ... Full text Cite

Relative photometric calibration of optical surveys

Journal Article Journal of Instrumentation · April 26, 2017 Photometric calibration is the top systematic uncertainty in measurements of Type Ia Supernova distances used to infer cosmological parameters. Uncertainties in the calibration can come from a variety of sources, e.g., measurements of the system throughput ... Full text Cite

Search for Type Ia supernova NUV-optical subclasses

Journal Article Monthly Notices of the Royal Astronomical Society · April 1, 2017 In response to a recently reported observation of evidence for two classes of Type Ia supernovae (SNe Ia) distinguished by their brightness in the rest-frame near-ultraviolet (NUV), we search for the phenomenon in publicly available light-curve data.We use ... Full text Cite

The Not so Simple Globular Cluster ω Cen. I. Spatial Distribution of the Multiple Stellar Populations

Journal Article Astronomical Journal · April 1, 2017 We present a multi-band photometric catalog of ≈1.7 million cluster members for a field of view of ≈2° ×2° across ω Cen. Photometry is based on images collected with the Dark Energy Camera on the 4 m Blanco telescope and the Advanced Camera for Surveys on ... Full text Cite

A Search for Kilonovae in the Dark Energy Survey

Journal Article Astrophysical Journal · March 1, 2017 The coalescence of a binary neutron star pair is expected to produce gravitational waves (GW) and electromagnetic radiation, both of which may be detectable with currently available instruments. We describe a search for a predicted r-process optical transi ... Full text Cite

Correcting Type Ia Supernova Distances for Selection Biases and Contamination in Photometrically Identified Samples

Journal Article Astrophysical Journal · February 10, 2017 We present a new technique to create a bin-averaged Hubble diagram (HD) from photometrically identified SN Ia data. The resulting HD is corrected for selection biases and contamination from core-collapse (CC) SNe, and can be used to infer cosmological para ... Full text Cite

THE GALEX TIME DOMAIN SURVEY. II. WAVELENGTH-DEPENDENT VARIABILITY of ACTIVE GALACTIC NUCLEI in the PAN-STARRS1 MEDIUM DEEP SURVEY

Journal Article Astrophysical Journal · December 20, 2016 We analyze the wavelength-dependent variability of a sample of spectroscopically confirmed active galactic nuclei selected from near-UV (NUV) variable sources in the GALEX Time Domain Survey that have a large amplitude of optical variability (difference-fl ... Full text Cite

The Pan-STARRS1 Surveys

Journal Article · December 15, 2016 Pan-STARRS1 has carried out a set of distinct synoptic imaging sky surveys including the $3\pi$ Steradian Survey and the Medium Deep Survey in 5 bands ($grizy_{P1}$). The mean 5$\sigma$ point source limiting sensitivities in the stacked 3$\pi$ Steradian Su ... Link to item Cite

HOST GALAXY IDENTIFICATION for SUPERNOVA SURVEYS

Journal Article Astronomical Journal · December 1, 2016 Host galaxy identification is a crucial step for modern supernova (SN) surveys such as the Dark Energy Survey and the Large Synoptic Survey Telescope, which will discover SNe by the thousands. Spectroscopic resources are limited, and so in the absence of r ... Full text Cite

PS1-14bj: A hydrogen-poor superluminous supernova with a long rise and slow decay

Journal Article Astrophysical Journal · November 10, 2016 We present photometry and spectroscopy of PS1-14bj, a hydrogen-poor superluminous supernova (SLSN) at redshift z = 0.5215 discovered in the last months of the Pan-STARRS1 Medium Deep Survey. PS1-14bj stands out because of its extremely slow evolution, with ... Full text Cite

OBSERVATION and CONFIRMATION of SIX STRONG-LENSING SYSTEMS in the DARK ENERGY SURVEY SCIENCE VERIFICATION DATA

Journal Article Astrophysical Journal · August 10, 2016 We report the observation and confirmation of the first group- and cluster-scale strong gravitational lensing systems found in Dark Energy Survey data. Through visual inspection of data from the Science Verification season, we identified 53 candidate syste ... Full text Cite

A DECAM SEARCH for AN OPTICAL COUNTERPART to the LIGO GRAVITATIONAL-WAVE EVENT GW151226

Journal Article Astrophysical Journal Letters · August 1, 2016 We report the results of a Dark Energy Camera optical follow-up of the gravitational-wave (GW) event GW151226, discovered by the Advanced Laser Interferometer Gravitational-wave Observatory detectors. Our observations cover 28.8 deg2 of the localization re ... Full text Cite

Localization and broadband follow-up of the gravitational-wave transient GW150914

Journal Article Astrophysical Journal Letters · July 20, 2016 A gravitational-wave (GW) transient was identified in data recorded by the Advanced Laser Interferometer Gravitational-wave Observatory (LIGO) detectors on 2015 September 14. The event, initially designated G184098 and later given the name GW150914, is des ... Full text Cite

A 2.4% DETERMINATION of the LOCAL VALUE of the HUBBLE CONSTANT

Journal Article Astrophysical Journal · July 20, 2016 We use the Wide Field Camera 3 (WFC3) on the Hubble Space Telescope (HST) to reduce the uncertainty in the local value of the Hubble constant from 3.3% to 2.4%. The bulk of this improvement comes from new near-infrared (NIR) observations of Cepheid variabl ... Full text Cite

SUPPLEMENT: "LOCALIZATION and BROADBAND FOLLOW-UP of the GRAVITATIONAL-WAVE TRANSIENT GW150914" (2016, ApJL, 826, L13)

Journal Article Astrophysical Journal, Supplement Series · July 1, 2016 This Supplement provides supporting material for Abbott et al. (2016a). We briefly summarize past electromagnetic (EM) follow-up efforts as well as the organization and policy of the current EM follow-up program. We compare the four probability sky maps pr ... Full text Cite

ASSESSMENT of SYSTEMATIC CHROMATIC ERRORS THAT IMPACT SUB-1% PHOTOMETRIC PRECISION in LARGE-AREA SKY SURVEYS

Journal Article Astronomical Journal · June 1, 2016 Meeting the science goals for many current and future ground-based optical large-area sky surveys requires that the calibrated broadband photometry is both stable in time and uniform over the sky to 1% precision or better. Past and current surveys have ach ... Full text Cite

A DARK ENERGY CAMERA SEARCH for AN OPTICAL COUNTERPART to the FIRST ADVANCED LIGO GRAVITATIONAL WAVE EVENT GW150914

Journal Article Astrophysical Journal Letters · June 1, 2016 We report the results of a deep search for an optical counterpart to the gravitational wave (GW) event GW150914, the first trigger from the Advanced LIGO GW detectors. We used the Dark Energy Camera (DECam) to image a 102 deg2 area, corresponding to 38% of ... Full text Cite

MEASURING TYPE IA SUPERNOVA POPULATIONS of STRETCH and COLOR and PREDICTING DISTANCE BIASES

Journal Article Astrophysical Journal Letters · May 10, 2016 Simulations of Type Ia supernovae (SNe Ia) surveys are a critical tool for correcting biases in the analysis of SNe Ia to infer cosmological parameters. Large-scale Monte Carlo simulations include a thorough treatment of observation history, measurement no ... Full text Cite

SDSS-II SUPERNOVA SURVEY: AN ANALYSIS of the LARGEST SAMPLE of TYPE IA SUPERNOVAE and CORRELATIONS with HOST-GALAXY SPECTRAL PROPERTIES

Journal Article Astrophysical Journal · April 20, 2016 Using the largest single-survey sample of Type Ia supernovae (SNe Ia) to date, we study the relationship between properties of SNe Ia and those of their host galaxies, focusing primarily on correlations with Hubble residuals (HRs). Our sample consists of 3 ... Full text Cite

SUPERCAL: CROSS-CALIBRATION of MULTIPLE PHOTOMETRIC SYSTEMS to IMPROVE COSMOLOGICAL MEASUREMENTS with TYPE Ia SUPERNOVAE

Journal Article Astrophysical Journal · December 20, 2015 Current cosmological analyses, which use Type Ia supernova observations, combine supernova (SN) samples to expand the redshift range beyond that of a single sample and increase the overall sample size. The inhomogeneous photometric calibration between diff ... Full text Cite

THE DIFFERENCE IMAGING PIPELINE for the TRANSIENT SEARCH in the DARK ENERGY SURVEY

Journal Article Astronomical Journal · December 1, 2015 We describe the operation and performance of the difference imaging pipeline (DiffImg) used to detect transients in deep images from the Dark Energy Survey Supernova program (DES-SN) in its first observing season from 2013 August through 2014 February. DES ... Full text Cite

Two SNe Ia at redshift ∼2: Improved classification and redshift determination with medium-band infrared imaging

Journal Article Astronomical Journal · November 1, 2015 We present two supernovae (SNe) discovered with the Hubble Space Telescope (HST) in the Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey, an HST multi-cycle treasury program. We classify both objects as SNe Ia and find redshifts of z = 1.80 ± ... Full text Cite

OzDES multifibre spectroscopy for the Dark Energy Survey: First-year operation and results

Journal Article Monthly Notices of the Royal Astronomical Society · October 27, 2015 The Australian Dark Energy Survey (OzDES) is a five-year, 100-night, spectroscopic survey on the Anglo-Australian Telescope, whose primary aim is to measure redshifts of approximately 2500 Type Ia supernovae host galaxies over the redshift range 0.1 < z < ... Full text Cite

Reconsidering the effects of local star formation on type Ia supernova cosmology

Journal Article Astrophysical Journal · October 10, 2015 Recent studies found a correlation with ∼3σ significance between the local star formation measured by GALEX in SN Ia host galaxies and the distances or dispersions derived from these SNe. We search for these effects by using data from recent cosmological a ... Full text Cite

Illuminating a dark lens: A type ia supernova magnified by the frontier fields galaxy cluster abell 2744

Journal Article Astrophysical Journal · September 20, 2015 SN HFF14Tom is a Type Ia SN discovered at Z = 1.3457 ± 0.0001 behind the galaxy cluster Abell 2744 (Z = 0.308). In a cosmology-independent analysis, we find that HFF14Tom is 0.77 ± 0.15 mag brighter than unlensed Type Ia SNe at similar redshift, implying a ... Full text Cite

Zooming in on the progenitors of superluminous supernovae with the HST

Journal Article Astrophysical Journal · May 10, 2015 We present Hubble Space Telescope (HST) rest-frame ultraviolet imaging of the host galaxies of 16 hydrogen-poor superluminous supernovae (SLSNe), including 11 events from the Pan-STARRS Medium Deep Survey. Taking advantage of the superb angular resolution ... Full text Cite

Galex detection of shock breakout in type IIP supernova PS1-13arp: Implications for the progenitor star wind

Journal Article Astrophysical Journal · May 1, 2015 We present the GALEX detection of a UV burst at the time of explosion of an optically normal supernova (SN) IIP (PS1-13arp) from the Pan-STARRS1 survey at z = 0.1665. The temperature and luminosity of the UV burst match the theoretical predictions for shoc ... Full text Cite

Selection of burst-like transients and stochastic variables using multi-band image differencing in the pan-starrs1 medium-deep survey

Journal Article Astrophysical Journal · March 20, 2015 We present a novel method for the light-curve characterization of Pan-STARRS1 Medium Deep Survey (PS1 MDS) extragalactic sources into stochastic variables (SVs) and burst-like (BL) transients, using multi-band image-differencing time-series data. We select ... Full text Cite

Astrophysics. Multiple images of a highly magnified supernova formed by an early-type cluster galaxy lens.

Journal Article Science (New York, N.Y.) · March 2015 In 1964, Refsdal hypothesized that a supernova whose light traversed multiple paths around a strong gravitational lens could be used to measure the rate of cosmic expansion. We report the discovery of such a system. In Hubble Space Telescope imaging, we ha ... Full text Cite

Selecting superluminous supernovae in faint galaxies from the first year of the Pan-STARRS1 medium deep survey

Journal Article Monthly Notices of the Royal Astronomical Society · January 20, 2015 The Pan-STARRS1 (PS1) survey has obtained imaging in five bands (grizyP1) over 10Medium Deep Survey (MDS) fields covering a total of 70 square degrees. This paper describes the search for apparently hostless supernovae (SNe) within the first year of PS1 MD ... Full text Cite

Systematic uncertainties associated with the cosmological analysis of the first PAN-STARRS1 type Ia supernova sample

Journal Article Astrophysical Journal · November 1, 2014 We probe the systematic uncertainties from the 113 Type Ia supernovae (SN Ia) in the Pan-STARRS1 (PS1) sample along with 197 SN Ia from a combination of low-redshift surveys. The companion paper by Rest et al. describes the photometric measurements and cos ... Full text Cite

Cosmological constraints from measurements of type Ia supernovae discovered during the first 1.5 yr of the Pan-STARRS1 survey

Journal Article Astrophysical Journal · November 1, 2014 We present grizP1 light curves of 146 spectroscopically confirmed Type Ia supernovae (SNe Ia; 0.03 < z < 0.65) discovered during the first 1.5 yr of the Pan-STARRS1 Medium Deep Survey. The Pan-STARRS1 natural photometric system is determined by a combinati ... Full text Cite

Rapidly evolving and luminous transients from Pan-STARRS1

Journal Article Astrophysical Journal · October 10, 2014 In the past decade, several rapidly evolving transients have been discovered whose timescales and luminosities are not easily explained by traditional supernovae (SNe) models. The sample size of these objects has remained small due, at least in part, to th ... Full text Cite

Hydrogen-poor superluminous supernovae and long-duration gamma-ray bursts have similar host galaxies

Journal Article Astrophysical Journal · June 1, 2014 We present optical spectroscopy and optical/near-IR photometry of 31 host galaxies of hydrogen-poor superluminous supernovae (SLSNe), including 15 events from the Pan-STARRS1 Medium Deep Survey. Our sample spans the redshift range 0.1 ≲ z ≲ 1.6, and is the ... Full text Cite

Color dispersion and milky-way-like reddening among type Ia supernovae

Journal Article Astrophysical Journal · January 1, 2014 Past analyses of Type Ia supernovae have identified an irreducible scatter of 5%-10% in distance, widely attributed to an intrinsic dispersion in luminosity. Another equally valid source of this scatter is intrinsic dispersion in color. Misidentification o ... Full text Cite

The ultraviolet-bright, slowly declining transient PS1-11af as a partial tidal disruption event

Journal Article Astrophysical Journal · January 1, 2014 We present the Pan-STARRS1 discovery of the long-lived and blue transient PS1-11af, which was also detected by Galaxy Evolution Explorer with coordinated observations in the near-ultraviolet (NUV) band. PS1-11af is associated with the nucleus of an early t ... Full text Cite

Slowly fading super-luminous supernovae that are not pair-instability explosions.

Journal Article Nature · October 2013 Super-luminous supernovae that radiate more than 10(44) ergs per second at their peak luminosity have recently been discovered in faint galaxies at redshifts of 0.1-4. Some evolve slowly, resembling models of 'pair-instability' supernovae. Such models invo ... Full text Cite

PS1-10bzj: A fast, hydrogen-poor superluminous supernova in a metal-poor host galaxy

Journal Article Astrophysical Journal · July 10, 2013 We present observations and analysis of PS1-10bzj, a superluminous supernova (SLSN) discovered in the Pan-STARRS Medium Deep Survey at a redshift z = 0.650. Spectroscopically, PS1-10bzj is similar to the hydrogen-poor SLSNe 2005ap and SCP 06F6, though with ... Full text Cite

PS1-10afx at z = 1.388: Pan-STARRS1 discovery of a new type of superluminous supernova

Journal Article Astrophysical Journal · April 20, 2013 We present the Pan-STARRS1 discovery of PS1-10afx, a unique hydrogen-deficient superluminous supernova (SLSN) at redshift z = 1.388. The light curve peaked at z P1 = 21.7 mag, making PS1-10afx comparable to the most luminous known SNe, with Mu = -22.3 mag. ... Full text Cite

An ultraviolet-optical flare from the tidal disruption of a helium-rich stellar core.

Journal Article Nature · May 2012 The flare of radiation from the tidal disruption and accretion of a star can be used as a marker for supermassive black holes that otherwise lie dormant and undetected in the centres of distant galaxies. Previous candidate flares have had declining light c ... Full text Cite

Displaying the heterogeneity of the SN 2002cx-like subclass of type Ia supernovae with observations of the Pan-STARRS-1 discovered SN 2009ku

Journal Article Astrophysical Journal Letters · April 10, 2011 SN 2009ku, discovered by Pan-STARRS-1, is a Type Ia supernova (SN Ia), and a member of the distinct SN 2002cx-like class of SNe Ia. Its light curves are similar to the prototypical SN 2002cx, but are slightly broader and have a later rise to maximum in g. ... Full text Cite

Optical cross-correlation filters: An economical approach for identifying SNe ia and estimating their redshifts

Journal Article Astrophysical Journal · January 1, 2009 Large photometric surveys of transient phenomena, such as Panoramic Survey Telescope and Rapid Response System and Large Synoptic Survey Telescope, will locate thousands to millions of Type Ia supernova (SN Ia) candidates per year, a rate prohibitive for a ... Full text Cite

Illuminating the dark universe with a very high density galaxy redshift survey over a wide area

Journal Article The nature of dark energy remains a profound mystery 20 years after the discovery of cosmic acceleration. A very high number density galaxy redshift survey over a wide area (HD GRS Wide) spanning the redshift range of 0.5 Link to item Cite

The Next Generation of Cosmological Measurements with Type Ia Supernovae

Journal Article While Type Ia Supernovae (SNe Ia) are one of the most mature cosmological probes, the next era promises to be extremely exciting in the number of different ways SNe Ia are used to measure various cosmological parameters. Here we review the experiments in t ... Link to item Cite

Photometric Classification of 2315 Pan-STARRS1 Supernovae with Superphot

Journal Article The Astrophysical Journal: an international review of astronomy and astronomical physics The classification of supernovae (SNe) and its impact on our understanding of the explosion physics and progenitors have traditionally been based on the presence or absence of certain spectral features. However, current and upcoming wide-field time-domain ... Link to item Cite