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

doi:10.1093/mnras/stac3056

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

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Abstract

Cosmological analyses with type Ia supernovae (SNe Ia) often assume a single empirical relation between colour and luminosity (β) 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 (∼1-6) of host R_V; (2) high-stellar mass hosts have R_V on average ∼0.7 lower than that of low-mass hosts; (3) for a subsample of 81 spectroscopically classified SNe there is a significant (>3σ) correlation between the Hubble diagram residuals of red SNe Ia and the host R_V that when corrected for reduces scatter by ∼ 13 per cent and the significance of the 'mass step' to ∼1σ. These represent independent confirmations of recent predictions based on dust that attempted to explain the puzzling 'mass step' and intrinsic scatter (σ_int) in SN Ia analyses.

Original language	English
Pages (from-to)	1985-2004
Number of pages	20
Journal	Monthly Notices of the Royal Astronomical Society
Volume	518
Issue number	2
DOIs	https://doi.org/10.1093/mnras/stac3056
Publication status	Published - 1 Jan 2023

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10.1093/mnras/stac3056

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@article{7ed65f99da9741e59f7f93dd5d3a559a,

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

abstract = "Cosmological analyses with type Ia supernovae (SNe Ia) often assume a single empirical relation between colour and luminosity (β) 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 AV, and a parameter describing the dust law slope RV) 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 (∼1-6) of host RV; (2) high-stellar mass hosts have RV on average ∼0.7 lower than that of low-mass hosts; (3) for a subsample of 81 spectroscopically classified SNe there is a significant (>3σ) correlation between the Hubble diagram residuals of red SNe Ia and the host RV that when corrected for reduces scatter by ∼ 13 per cent and the significance of the 'mass step' to ∼1σ. These represent independent confirmations of recent predictions based on dust that attempted to explain the puzzling 'mass step' and intrinsic scatter (σint) in SN Ia analyses.",

keywords = "cosmology: observations, galaxies: general, supernovae: general, surveys",

author = "C. Meldorf and A. Palmese and D. Brout and R. Chen and D. Scolnic and L. Kelsey and L. Galbany and Hartley, {W. G.} and Davis, {T. M.} and A. Drlica-Wagner and M. Vincenzi and J. Annis and M. Dixon and O. Graur and C. Lidman and A. M{\"o}ller and P. Nugent and B. Rose and M. Smith and S. Allam and Tucker, {D. L.} and J. Asorey and J. Calcino and D. Carollo and K. Glazebrook and Lewis, {G. F.} and G. Taylor and Tucker, {B. E.} and Kim, {A. G.} and Diehl, {H. T.} and M. Aguena and F. Andrade-Oliveira and D. Bacon and E. Bertin and S. Bocquet and D. Brooks and Burke, {D. L.} and J. Carretero and Kind, {M. Carrasco} and Castander, {F. J.} and M. Costanzi and {da Costa}, {L. N.} and S. Desai and P. Doel and S. Everett and I. Ferrero and D. Friedel and J. Frieman and J. Garc{\'i}a-Bellido and M. Gatti",

note = "Publisher Copyright: {\textcopyright} 2022 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society.",

year = "2023",

month = jan,

day = "1",

doi = "10.1093/mnras/stac3056",

language = "English",

volume = "518",

pages = "1985--2004",

journal = "Monthly Notices of the Royal Astronomical Society",

issn = "0035-8711",

publisher = "Oxford University Press ",

number = "2",

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TY - JOUR

T1 - The Dark Energy Survey Supernova Program results

T2 - type Ia supernova brightness correlates with host galaxy dust

AU - Meldorf, C.

AU - Palmese, A.

AU - Brout, D.

AU - Chen, R.

AU - Scolnic, D.

AU - Kelsey, L.

AU - Galbany, L.

AU - Hartley, W. G.

AU - Davis, T. M.

AU - Drlica-Wagner, A.

AU - Vincenzi, M.

AU - Annis, J.

AU - Dixon, M.

AU - Graur, O.

AU - Lidman, C.

AU - Möller, A.

AU - Nugent, P.

AU - Rose, B.

AU - Smith, M.

AU - Allam, S.

AU - Tucker, D. L.

AU - Asorey, J.

AU - Calcino, J.

AU - Carollo, D.

AU - Glazebrook, K.

AU - Lewis, G. F.

AU - Taylor, G.

AU - Tucker, B. E.

AU - Kim, A. G.

AU - Diehl, H. T.

AU - Aguena, M.

AU - Andrade-Oliveira, F.

AU - Bacon, D.

AU - Bertin, E.

AU - Bocquet, S.

AU - Brooks, D.

AU - Burke, D. L.

AU - Carretero, J.

AU - Kind, M. Carrasco

AU - Castander, F. J.

AU - Costanzi, M.

AU - da Costa, L. N.

AU - Desai, S.

AU - Doel, P.

AU - Everett, S.

AU - Ferrero, I.

AU - Friedel, D.

AU - Frieman, J.

AU - García-Bellido, J.

AU - Gatti, M.

PY - 2023/1/1

Y1 - 2023/1/1

N2 - Cosmological analyses with type Ia supernovae (SNe Ia) often assume a single empirical relation between colour and luminosity (β) 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 AV, and a parameter describing the dust law slope RV) 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 (∼1-6) of host RV; (2) high-stellar mass hosts have RV on average ∼0.7 lower than that of low-mass hosts; (3) for a subsample of 81 spectroscopically classified SNe there is a significant (>3σ) correlation between the Hubble diagram residuals of red SNe Ia and the host RV that when corrected for reduces scatter by ∼ 13 per cent and the significance of the 'mass step' to ∼1σ. These represent independent confirmations of recent predictions based on dust that attempted to explain the puzzling 'mass step' and intrinsic scatter (σint) in SN Ia analyses.

AB - Cosmological analyses with type Ia supernovae (SNe Ia) often assume a single empirical relation between colour and luminosity (β) 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 AV, and a parameter describing the dust law slope RV) 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 (∼1-6) of host RV; (2) high-stellar mass hosts have RV on average ∼0.7 lower than that of low-mass hosts; (3) for a subsample of 81 spectroscopically classified SNe there is a significant (>3σ) correlation between the Hubble diagram residuals of red SNe Ia and the host RV that when corrected for reduces scatter by ∼ 13 per cent and the significance of the 'mass step' to ∼1σ. These represent independent confirmations of recent predictions based on dust that attempted to explain the puzzling 'mass step' and intrinsic scatter (σint) in SN Ia analyses.

KW - cosmology: observations

KW - galaxies: general

KW - supernovae: general

KW - surveys

UR - http://www.scopus.com/inward/record.url?scp=85150049895&partnerID=8YFLogxK

U2 - 10.1093/mnras/stac3056

DO - 10.1093/mnras/stac3056

M3 - Article

SN - 0035-8711

VL - 518

SP - 1985

EP - 2004

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 2

ER -

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

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