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

Desai, Shantanu (2023) The Dark Energy Survey Supernova Program results: type Ia supernova brightness correlates with host galaxy dust. Monthly Notices of the Royal Astronomical Society, 518 (2). pp. 1985-2004. ISSN 0035-8711

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Abstract

Cosmological analyses with type Ia supernovae (SNe Ia) often assume a single empirical relation between colour and luminosity (beta) and do not account for varying host-galaxy dust properties. However, from studies of dust in large samples of galaxies, it is known that dust attenuation can vary significantly. Here, we take advantage of state-of-the-art modelling of galaxy properties to characterize dust parameters (dust attenuation A(V), and a parameter describing the dust law slope R-V) for 1100 Dark Energy Survey (DES) SN host galaxies. Utilizing optical and infrared data of the hosts alone, we find three key aspects of host dust that impact SN cosmology: (1) there exists a large range (similar to 1-6) of host R-V; (2) high-stellar mass hosts have R-V on average similar to 0.7 lower than that of low-mass hosts; (3) for a subsample of 81 spectroscopically classified SNe there is a significant (>3 sigma) correlation between the Hubble diagram residuals of red SNe Ia and the host R-V that when corrected for reduces scatter by similar to 13 per cent and the significance of the 'mass step' to similar to 1 sigma . These represent independent confirmations of recent predictions based on dust that attempted to explain the puzzling 'mass step' and intrinsic scatter (sigma(int)) in SN Ia analyses.

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IITH Creators:

IITH Creators	ORCiD
Desai, Shantanu	http://orcid.org/0000-0002-0466-3288

Item Type:

Article

Uncontrolled Keywords:

PANTHEON PLUS ANALYSIS; STELLAR MASS; SDSS-II; COSMOLOGICAL CONSTRAINTS; HUBBLE RESIDUALS; SNE IA; CURVE; ATTENUATION; EXTINCTION; DEPENDENCE; surveyssupernovae: generalgalaxies: generalcosmology: observations

Subjects:

Physics
Physics > Classical mechanics
Physics > Astronomy Astrophysics

Divisions:

Department of Physics

Depositing User:

Mr Nigam Prasad Bisoyi

Date Deposited:

18 Aug 2023 08:45

Last Modified:

18 Aug 2023 08:45

URI:

http://raiithold.iith.ac.in/id/eprint/11571