The influence of Host Galaxies in Type Ia Supernova Cosmology

Abstract

We use a sample of 1338 spectroscopically confirmed and photometrically classified Type Ia Supernovae (SNe Ia), sourced from the CSP, CfA, SDSS-II, and SNLS supernova samples, to examine the relationships between SNe Ia and the galaxies that host them. Our results provide confirmation with improved statistical significance that SNe Ia, after standardization, are on average more luminous in massive hosts (significance $>5\sigma$), and decline more rapidly in massive hosts (significance $>9\sigma$) and in hosts with low specific star formation rates (significance $>8\sigma$). We study the variation of these relationships with redshift and detect no evolution. We split SNe Ia into pairs of subsets that are based on the properties of the hosts, and fit cosmological models to each subset. Including both systematic and statistical uncertainties, we do not find any significant shift in the best-fit cosmological parameters between the subsets. Among different SN Ia subsets, we find that SNe Ia in hosts with high specific star formation rates have the least intrinsic scatter (${\sigma }_{\mathrm{int}}=0.08\pm 0.01$) in luminosity after standardization.

Accepted to be published in The Astrophysical Journal

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• Testing the Consistency of Dust Laws in SN Ia Host Galaxies: A BayeSN Examination of Foundation DR1
• Concerning Colour: The Effect of Environment on Type Ia Supernova Colour in the Dark Energy Survey
• Accuracy of environmental tracers and consequence for determining the Type Ia Supernovae magnitude step
• Supernovae and their host galaxies -- VII. The diversity of Type Ia supernova progenitors
• Host Galaxy Mass Combined with Local Stellar Age Improve Type Ia Supernovae Distances
• Carnegie Supernova Project-II: Near-infrared spectral diversity and template of Type Ia Supernovae
• Systematic errors on optical-SED stellar mass estimates for galaxies across cosmic time and their impact on cosmology
• Initial Evaluation of SNEMO2 and SNEMO7 Standardization Derived From Current Light Curves of Type Ia Supernovae
• Average Spectral Properties of Type Ia Supernova Host Galaxies
• An archival search for type Ia supernova siblings
• ZTF SN Ia DR2: Evidence of Changing Dust Distributions With Redshift Using Type Ia Supernovae
• Type Ia supernovae in the star formation deserts of spiral host galaxies
• Stellar Populations in type Ia supernova host galaxies at intermediate-high redshift: Star formation and metallicity enrichment histories
• Hawai'i Supernova Flows: A Peculiar Velocity Survey Using Over a Thousand Supernovae in the Near-Infrared
• Constraining Type Ia supernovae via their distances from spiral arms