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Environmental dependence of type Ia supernova luminosities from a sample without a local-global difference in host star formation

Environmental dependence of type Ia supernova luminosities from a sample without a local-global difference in host star formation
Environmental dependence of type Ia supernova luminosities from a sample without a local-global difference in host star formation

It is established that there is a dependence of the luminosity of type Ia supernovae (SNe Ia) on environment: SNe Ia in young, star-forming, metal-poor stellar populations appear fainter after light-curve shape corrections than those in older, passive, metal-rich environments. This is accounted for in cosmological studies using a global property of the SN host galaxy, typically the host galaxy stellar mass. However, recent low-redshift studies suggest that this effect manifests itself most strongly when using the local star formation rate (SFR) at the SN location, rather than the global SFR or the stellar mass of the host galaxy. At high-redshift, such local SFRs are difficult to determine; here, we show that an equivalent local correction can be made by restricting the SN Ia sample in globally star-forming host galaxies to a low-mass host galaxy subset (≤1010 M o). Comparing this sample of SNe Ia (in locally star-forming environments) to those in locally passive host galaxies, we find that SNe Ia in locally star-forming environments are 0.081 ± 0.018 mag fainter (4.5σ), consistent with the result reported by Rigault et al., but our conclusion is based on a sample ∼5 times larger over a wider redshift range. This is a larger difference than when splitting the SN Ia sample based on global host galaxy SFR or host galaxy stellar mass. This method can be used in ongoing and future high-redshift SN surveys, where local SN Ia environments are difficult to determine.

cosmology: observations, distance scale, supernovae: general
0004-637X
Kim, Young Lo
add8d52a-ed65-486f-80a6-50c334580b92
Smith, Mathew
8bdc74e1-a37b-434d-ae75-82763109bf7a
Sullivan, Mark
2f31f9fa-8e79-4b35-98e2-0cb38f503850
Lee, Young Wook
68e9d7fb-2272-4185-a13c-16eb37da8311
Kim, Young Lo
add8d52a-ed65-486f-80a6-50c334580b92
Smith, Mathew
8bdc74e1-a37b-434d-ae75-82763109bf7a
Sullivan, Mark
2f31f9fa-8e79-4b35-98e2-0cb38f503850
Lee, Young Wook
68e9d7fb-2272-4185-a13c-16eb37da8311

Kim, Young Lo, Smith, Mathew, Sullivan, Mark and Lee, Young Wook (2018) Environmental dependence of type Ia supernova luminosities from a sample without a local-global difference in host star formation. The Astrophysical Journal, 854 (1). (doi:10.3847/1538-4357/aaa127).

Record type: Article

Abstract

It is established that there is a dependence of the luminosity of type Ia supernovae (SNe Ia) on environment: SNe Ia in young, star-forming, metal-poor stellar populations appear fainter after light-curve shape corrections than those in older, passive, metal-rich environments. This is accounted for in cosmological studies using a global property of the SN host galaxy, typically the host galaxy stellar mass. However, recent low-redshift studies suggest that this effect manifests itself most strongly when using the local star formation rate (SFR) at the SN location, rather than the global SFR or the stellar mass of the host galaxy. At high-redshift, such local SFRs are difficult to determine; here, we show that an equivalent local correction can be made by restricting the SN Ia sample in globally star-forming host galaxies to a low-mass host galaxy subset (≤1010 M o). Comparing this sample of SNe Ia (in locally star-forming environments) to those in locally passive host galaxies, we find that SNe Ia in locally star-forming environments are 0.081 ± 0.018 mag fainter (4.5σ), consistent with the result reported by Rigault et al., but our conclusion is based on a sample ∼5 times larger over a wider redshift range. This is a larger difference than when splitting the SN Ia sample based on global host galaxy SFR or host galaxy stellar mass. This method can be used in ongoing and future high-redshift SN surveys, where local SN Ia environments are difficult to determine.

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More information

Accepted/In Press date: 8 December 2017
e-pub ahead of print date: 7 February 2018
Published date: 10 February 2018
Keywords: cosmology: observations, distance scale, supernovae: general

Identifiers

Local EPrints ID: 420705
URI: https://eprints.soton.ac.uk/id/eprint/420705
ISSN: 0004-637X
PURE UUID: d95a5e51-4357-4d8b-8406-a28b6fac7884
ORCID for Mathew Smith: ORCID iD orcid.org/0000-0002-3321-1432
ORCID for Mark Sullivan: ORCID iD orcid.org/0000-0001-9053-4820

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Date deposited: 11 May 2018 16:30
Last modified: 17 May 2019 00:30

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Contributors

Author: Young Lo Kim
Author: Mathew Smith ORCID iD
Author: Mark Sullivan ORCID iD
Author: Young Wook Lee

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