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

Publication ,  Journal Article
Qu, H; Sako, M; Vincenzi, M; Sánchez, C; Brout, D; Kessler, R; Chen, R; Davis, T; Galbany, L; Kelsey, L; Lee, J; Lidman, C; Popovic, B ...
Published in: 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 and thus incorrect redshifts. We evaluate the host galaxy mismatch rate and resulting biases on cosmological parameters from simulations modeled after the Dark Energy Survey 5 Yr (DES-SN5YR) photometric sample. For both DES-SN5YR data and simulations, we employ the directional light radius method for host galaxy matching. In our SN Ia simulations, we find that 1.7% of SNe are matched to the wrong host galaxy, with redshift differences between the true and matched hosts of up to 0.6. Using our analysis pipeline, we determine the shift in the dark energy equation of state parameter (Δw) due to including SNe with incorrect host galaxy matches. For SN Ia–only simulations, we find Δw = 0.0013 ± 0.0026 with constraints from the cosmic microwave background. Including core-collapse SNe and peculiar SNe Ia in the simulation, we find that Δw ranges from 0.0009 to 0.0032, depending on the photometric classifier used. This bias is an order of magnitude smaller than the expected total uncertainty on w from the DES-SN5YR sample of ∼0.03. We conclude that the bias on w from host galaxy mismatch is much smaller than the uncertainties expected from the DES-SN5YR sample, but we encourage further studies to reduce this bias through better host-matching algorithms or selection cuts.

Duke Scholars

Published In

Astrophysical Journal

DOI

EISSN

1538-4357

ISSN

0004-637X

Publication Date

April 1, 2024

Volume

964

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
 

Citation

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Qu, H., Sako, M., Vincenzi, M., Sánchez, C., Brout, D., Kessler, R., … Weaverdyck, N. (2024). The Dark Energy Survey Supernova Program: Cosmological Biases from Host Galaxy Mismatch of Type Ia Supernovae. Astrophysical Journal, 964(2). https://doi.org/10.3847/1538-4357/ad251d
Qu, H., M. Sako, M. Vincenzi, C. Sánchez, D. Brout, R. Kessler, R. Chen, et al. “The Dark Energy Survey Supernova Program: Cosmological Biases from Host Galaxy Mismatch of Type Ia Supernovae.” Astrophysical Journal 964, no. 2 (April 1, 2024). https://doi.org/10.3847/1538-4357/ad251d.
Qu H, Sako M, Vincenzi M, Sánchez C, Brout D, Kessler R, et al. The Dark Energy Survey Supernova Program: Cosmological Biases from Host Galaxy Mismatch of Type Ia Supernovae. Astrophysical Journal. 2024 Apr 1;964(2).
Qu, H., et al. “The Dark Energy Survey Supernova Program: Cosmological Biases from Host Galaxy Mismatch of Type Ia Supernovae.” Astrophysical Journal, vol. 964, no. 2, Apr. 2024. Scopus, doi:10.3847/1538-4357/ad251d.
Qu H, Sako M, Vincenzi M, Sánchez C, Brout D, Kessler R, Chen R, Davis T, Galbany L, Kelsey L, Lee J, Lidman C, Popovic B, Rose B, Scolnic D, Smith M, Sullivan M, Wiseman P, Abbott TMC, Aguena M, Alves O, Bacon D, Bertin E, Burke DL, Brooks D, Carnero Rosell A, Carretero J, da Costa LN, Pereira MES, Diehl HT, Doel P, Everett S, Ferrero I, Frieman J, García-Bellido J, Giannini G, Gruen D, Gruendl RA, Gutierrez G, Hinton SR, Hollowood DL, Honscheid K, Kuehn K, James DJ, Lahav O, Marshall JL, Mena-Fernández J, Menanteau F, Miquel R, Ogando RLC, Palmese A, Pieres A, Plazas-Malagón AA, Raveri M, Sanchez E, Sevilla-Noarbe I, Soares-Santos M, Suchyta E, Tarle G, Weaverdyck N. The Dark Energy Survey Supernova Program: Cosmological Biases from Host Galaxy Mismatch of Type Ia Supernovae. Astrophysical Journal. 2024 Apr 1;964(2).
Journal cover image

Published In

Astrophysical Journal

DOI

EISSN

1538-4357

ISSN

0004-637X

Publication Date

April 1, 2024

Volume

964

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