The Dependence of the Type Ia Supernova Host Bias on Observation or Fitting Technique

Hand, Jared; Liu, Shu; Galbany, Lluís; Perrefort, Daniel; Wood-Vasey, W. M.; Burns, Chris

doi:10.3847/1538-4357/ac389f

Title: The Dependence of the Type Ia Supernova Host Bias on Observation or Fitting Technique

Journal Article · 30 January 2022 · The Astrophysical Journal

DOI: https://doi.org/10.3847/1538-4357/ac389f · OSTI ID:1981243

^[1]; Liu, Shu ^[2];

^[3];

^[2];

^[4]

Univ. of Pittsburgh, PA (United States); Univ. of Pittsburgh, PA (United States)
Univ. of Pittsburgh, PA (United States)
Univ. Autonoma de Barcelona (Spain). Institute of Space Sciences; Institut d'Estudis Espacials de Catalunya (IEEC), Barcelona (Spain)
Observatories of the Carnegie Institution for Science, Pasadena, CA (United States)

More luminous Type Ia supernovae prefer less massive hosts and regions of higher star formation. This correlation is inverted during width–color–luminosity light-curve standardization resulting in step-like biases of distance measurements with respect to host properties. Using the PMAS/PPak Integral-field Supernovahosts COmpilation (PISCO) supernova host sample and Sloan Digital Sky Survey, Galaxy Evolution Explorer, and Two Micron All Sky Survey photometry, we compare host stellar mass and specific star-formation rate (sSFR) from different observation methods, including local versus global, and fitting techniques to measure their impact on the host step biases. Mass-step measurements for all our mass samples are consistent within a 1σ significance from –0.03 ± 0.02 mag to –0.04 ± 0.02 mag. Including or excluding UV information had no effect on measured mass-step size or location. sSFR step sizes are more significant than mass-step measurements and varied from 0.05 ± 0.03 mag (Hα) and 0.06 ± 0.02 mag (UV) for a 51 host sample. The sSFR step location is influenced by the mass sample used to normalize star formation and by sSFR tracer choice. The step size is reduced to 0.04 ± 0.03 mag when using all available 73 hosts with Hα measurements. This 73 PISCO host subsample overall lacked a clear step signal, but here we are searching for whether different choices of mass or sSFR estimation can create a step signal. We find no evidence that different observation or fitting techniques choices can create a distance measurement step in either mass or sSFR.

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Research Organization:: Univ. of Pittsburgh, PA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: SC0007914

OSTI ID:: 1981243

Journal Information:: The Astrophysical Journal, Journal Name: The Astrophysical Journal Journal Issue: 2 Vol. 925; ISSN 0004-637X

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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astronomical techniques
galaxy properties
observational cosmology

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