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The effect of environment on Type Ia supernovae in the Dark Energy Survey three-year cosmological sample

The effect of environment on Type Ia supernovae in the Dark Energy Survey three-year cosmological sample
The effect of environment on Type Ia supernovae in the Dark Energy Survey three-year cosmological sample
Analyses of Type Ia supernovae (SNe Ia) have found puzzling correlations between their standardized luminosities and host galaxy properties: SNe Ia in high-mass, passive hosts appear brighter than those in lower mass, star-forming hosts. We examine the host galaxies of SNe Ia in the Dark Energy Survey 3-yr spectroscopically confirmed cosmological sample, obtaining photometry in a series of 'local' apertures centred on the SN, and for the global host galaxy. We study the differences in these host galaxy properties, such as stellar mass and rest-frame U - R colours, and their correlations with SN Ia parameters including Hubble residuals. We find all Hubble residual steps to be >3σ in significance, both for splitting at the traditional environmental property sample median and for the step of maximum significance. For stellar mass, we find a maximal local step of 0.098 ± 0.018 mag; ∼0.03 mag greater than the largest global stellar mass step in our sample (0.070 ± 0.017 mag). When splitting at the sample median, differences between local and global U - R steps are small, both ∼0.08 mag, but are more significant than the global stellar mass step (0.057 ± 0.017 mag). We split the data into sub-samples based on SN Ia light-curve parameters: stretch (x1) and colour (c), finding that redder objects (c > 0) have larger Hubble residual steps, for both stellar mass and U - R, for both local and global measurements, of ∼0.14 mag. Additionally, the bluer (star-forming) local environments host a more homogeneous SN Ia sample, with local U - R rms scatter as low as 0.084 ± 0.017 mag for blue (c < 0) SNe Ia in locally blue U - R environments.
surveys, supernovae: general, distance scale, cosmology: observations
1365-2966
4861-4876
Kelsey, L.
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Sullivan, M.
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Wiseman, P.
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Brout, D.
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Frohmaier, C.
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Galbany, L.
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Grayling, M.
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Gutiérrez, C. P.
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Hinton, S. R.
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Kessler, R.
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Lidman, C.
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Möller, A.
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Carnero Rosell, A.
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Carrasco Kind, M.
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Desai, S.
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Diehl, H. T.
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Doel, P.
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Everett, S.
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Ferrero, I.
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Ferté, A.
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Flaugher, B.
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Fosalba, P.
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García-Bellido, J.
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Gerdes, D. W.
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Gruen, D.
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Gruendl, R. A.
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Gschwend, J.
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Gutierrez, G.
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Hollowood, D. L.
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Honscheid, K.
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Kim, A. G.
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Kuehn, K.
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Kuropatkin, N.
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Lahav, O.
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Lima, M.
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Martini, P.
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The Dark Energy Survey Collaboration
Kelsey, L.
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Sullivan, M.
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Wiseman, P.
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Brout, D.
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Frohmaier, C.
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Galbany, L.
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Grayling, M.
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Gutiérrez, C. P.
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Hinton, S. R.
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Kessler, R.
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Lidman, C.
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Möller, A.
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Sako, M.
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Scolnic, D.
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Uddin, S. A.
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Vincenzi, M.
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Aguena, M.
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Allam, S.
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Annis, J.
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Avila, S.
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Bertin, E.
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Burke, D. L.
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Carnero Rosell, A.
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Carrasco Kind, M.
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Carretero, J.
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Castander, F. J.
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Costanzi, M.
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da Costa, L. N.
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Desai, S.
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Diehl, H. T.
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Doel, P.
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Everett, S.
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Ferrero, I.
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Ferté, A.
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Flaugher, B.
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Fosalba, P.
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García-Bellido, J.
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Gerdes, D. W.
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Gruen, D.
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Gruendl, R. A.
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Gschwend, J.
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Gutierrez, G.
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Hollowood, D. L.
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Honscheid, K.
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Kim, A. G.
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Kuehn, K.
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Kuropatkin, N.
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Lahav, O.
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Lima, M.
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Martini, P.
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Kelsey, L., Sullivan, M., Wiseman, P., Brout, D., Frohmaier, C., Galbany, L., Grayling, M., Gutiérrez, C. P., Hinton, S. R., Kessler, R., Lidman, C., Möller, A., Sako, M., Scolnic, D., Uddin, S. A., Vincenzi, M., Aguena, M., Allam, S., Annis, J., Avila, S., Bertin, E., Burke, D. L., Carnero Rosell, A., Carrasco Kind, M., Carretero, J., Castander, F. J., Costanzi, M., da Costa, L. N., Desai, S., Diehl, H. T., Doel, P., Everett, S., Ferrero, I., Ferté, A., Flaugher, B., Fosalba, P., García-Bellido, J., Gerdes, D. W., Gruen, D., Gruendl, R. A., Gschwend, J., Gutierrez, G., Hollowood, D. L., Honscheid, K., Kim, A. G., Kuehn, K., Kuropatkin, N., Lahav, O., Lima, M. and Martini, P. , The Dark Energy Survey Collaboration (2020) The effect of environment on Type Ia supernovae in the Dark Energy Survey three-year cosmological sample. Monthly Notices of the Royal Astronomical Society, 501 (4), 4861-4876. (doi:10.1093/mnras/staa3924).

Record type: Article

Abstract

Analyses of Type Ia supernovae (SNe Ia) have found puzzling correlations between their standardized luminosities and host galaxy properties: SNe Ia in high-mass, passive hosts appear brighter than those in lower mass, star-forming hosts. We examine the host galaxies of SNe Ia in the Dark Energy Survey 3-yr spectroscopically confirmed cosmological sample, obtaining photometry in a series of 'local' apertures centred on the SN, and for the global host galaxy. We study the differences in these host galaxy properties, such as stellar mass and rest-frame U - R colours, and their correlations with SN Ia parameters including Hubble residuals. We find all Hubble residual steps to be >3σ in significance, both for splitting at the traditional environmental property sample median and for the step of maximum significance. For stellar mass, we find a maximal local step of 0.098 ± 0.018 mag; ∼0.03 mag greater than the largest global stellar mass step in our sample (0.070 ± 0.017 mag). When splitting at the sample median, differences between local and global U - R steps are small, both ∼0.08 mag, but are more significant than the global stellar mass step (0.057 ± 0.017 mag). We split the data into sub-samples based on SN Ia light-curve parameters: stretch (x1) and colour (c), finding that redder objects (c > 0) have larger Hubble residual steps, for both stellar mass and U - R, for both local and global measurements, of ∼0.14 mag. Additionally, the bluer (star-forming) local environments host a more homogeneous SN Ia sample, with local U - R rms scatter as low as 0.084 ± 0.017 mag for blue (c < 0) SNe Ia in locally blue U - R environments.

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Accepted/In Press date: 15 December 2020
Published date: 21 December 2020
Keywords: surveys, supernovae: general, distance scale, cosmology: observations

Identifiers

Local EPrints ID: 468155
URI: http://eprints.soton.ac.uk/id/eprint/468155
ISSN: 1365-2966
PURE UUID: 283b6bd9-71d5-476d-967f-45fe6554da9f
ORCID for M. Sullivan: ORCID iD orcid.org/0000-0001-9053-4820
ORCID for P. Wiseman: ORCID iD orcid.org/0000-0002-3073-1512

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Date deposited: 04 Aug 2022 16:32
Last modified: 28 Feb 2024 03:01

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Contributors

Author: L. Kelsey
Author: M. Sullivan ORCID iD
Author: P. Wiseman ORCID iD
Author: D. Brout
Author: C. Frohmaier
Author: L. Galbany
Author: M. Grayling
Author: C. P. Gutiérrez
Author: S. R. Hinton
Author: R. Kessler
Author: C. Lidman
Author: A. Möller
Author: M. Sako
Author: D. Scolnic
Author: S. A. Uddin
Author: M. Vincenzi
Author: M. Aguena
Author: S. Allam
Author: J. Annis
Author: S. Avila
Author: E. Bertin
Author: D. L. Burke
Author: A. Carnero Rosell
Author: M. Carrasco Kind
Author: J. Carretero
Author: F. J. Castander
Author: M. Costanzi
Author: L. N. da Costa
Author: S. Desai
Author: H. T. Diehl
Author: P. Doel
Author: S. Everett
Author: I. Ferrero
Author: A. Ferté
Author: B. Flaugher
Author: P. Fosalba
Author: J. García-Bellido
Author: D. W. Gerdes
Author: D. Gruen
Author: R. A. Gruendl
Author: J. Gschwend
Author: G. Gutierrez
Author: D. L. Hollowood
Author: K. Honscheid
Author: A. G. Kim
Author: K. Kuehn
Author: N. Kuropatkin
Author: O. Lahav
Author: M. Lima
Author: P. Martini
Corporate Author: The Dark Energy Survey Collaboration

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