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

Publication ,  Journal Article
Joshi, BA; Strolger, LG; Ryan, RE; Filippenko, AV; Hounsell, R; Kelly, PL; Kessler, R; Macias, P; Rose, B; Scolnic, D
Published in: 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) redshifts, as a function of P127 prism exposure time, to guide planning for future observing programs with the Roman prism. Generating the two-dimensional dispersed images and extracting one-dimensional spectra is done with the slitless spectroscopy package pyLINEAR along with custom-written software. From the analysis of 1698 simulated SN Ia P127 prism spectra, we show the efficiency of recovering SN redshifts to z ≲ 3.0, highlighting the exceptional sensitivity of the Roman P127 prism. Redshift recovery is assessed by setting a requirement of σ z = ( z − z true ) / ( 1 + z ) ≤ 0.01 . We find that 3 hr exposures are sufficient for meeting this requirement, for ≳50% of the sample of mock SNe Ia at z ≈ 2 and within ±5 days of rest-frame maximum light in the optical. We also show that a 1 hr integration of Roman can achieve the same precision in completeness to a depth of 24.4 ± 0.06 AB mag (or z ≲ 1). Implications for cosmological studies with Roman P127 prism spectra of SNe Ia are also discussed.

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Published In

Astrophysical Journal

DOI

EISSN

1538-4357

ISSN

0004-637X

Publication Date

December 1, 2022

Volume

941

Issue

2

Related Subject Headings

  • Astronomy & Astrophysics
  • 5109 Space sciences
  • 5107 Particle and high energy physics
  • 5101 Astronomical sciences
  • 0306 Physical Chemistry (incl. Structural)
  • 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics
  • 0201 Astronomical and Space Sciences
 

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Joshi, B. A., Strolger, L. G., Ryan, R. E., Filippenko, A. V., Hounsell, R., Kelly, P. L., … Scolnic, D. (2022). High-precision Redshifts for Type Ia Supernovae with the Nancy Grace Roman Space Telescope P127 Prism. Astrophysical Journal, 941(2). https://doi.org/10.3847/1538-4357/ac9fd5
Joshi, B. A., L. G. Strolger, R. E. Ryan, A. V. Filippenko, R. Hounsell, P. L. Kelly, R. Kessler, P. Macias, B. Rose, and D. Scolnic. “High-precision Redshifts for Type Ia Supernovae with the Nancy Grace Roman Space Telescope P127 Prism.” Astrophysical Journal 941, no. 2 (December 1, 2022). https://doi.org/10.3847/1538-4357/ac9fd5.
Joshi BA, Strolger LG, Ryan RE, Filippenko AV, Hounsell R, Kelly PL, et al. High-precision Redshifts for Type Ia Supernovae with the Nancy Grace Roman Space Telescope P127 Prism. Astrophysical Journal. 2022 Dec 1;941(2).
Joshi, B. A., et al. “High-precision Redshifts for Type Ia Supernovae with the Nancy Grace Roman Space Telescope P127 Prism.” Astrophysical Journal, vol. 941, no. 2, Dec. 2022. Scopus, doi:10.3847/1538-4357/ac9fd5.
Joshi BA, Strolger LG, Ryan RE, Filippenko AV, Hounsell R, Kelly PL, Kessler R, Macias P, Rose B, Scolnic D. High-precision Redshifts for Type Ia Supernovae with the Nancy Grace Roman Space Telescope P127 Prism. Astrophysical Journal. 2022 Dec 1;941(2).
Journal cover image

Published In

Astrophysical Journal

DOI

EISSN

1538-4357

ISSN

0004-637X

Publication Date

December 1, 2022

Volume

941

Issue

2

Related Subject Headings

  • Astronomy & Astrophysics
  • 5109 Space sciences
  • 5107 Particle and high energy physics
  • 5101 Astronomical sciences
  • 0306 Physical Chemistry (incl. Structural)
  • 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics
  • 0201 Astronomical and Space Sciences