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The effect of environment on type Ia supernovae in the dark energy survey three-year cosmological sample

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journal contribution
posted on 2023-06-09, 22:48 authored by L Kelsey, M Sullivan, M Smith, P Wiseman, D Brout, T M Davis, C Frohmaier, L Galbany, M Grayling, C P Gutiérrez, S R Hinton, R Kessler, C Lidman, Reese WilkinsonReese Wilkinson, Kathy RomerKathy Romer, DES Collaboration, others
Analyses of type Ia supernovae (SNe Ia) have found puzzling correlations between their standardised 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 three-year 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 >3s 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 r.m.s. scatter as low as 0.084 ± 0.017 mag for blue (c < 0) SNe Ia in locally blue U - R environments.

History

Publication status

  • Published

File Version

  • Accepted version

Journal

Monthly Notices of the Royal Astronomical Society

ISSN

0035-8711

Publisher

Oxford University Press

Issue

4

Volume

501

Page range

4861-4876

Pages

19.0

Department affiliated with

  • Physics and Astronomy Publications

Full text available

  • Yes

Peer reviewed?

  • Yes

Legacy Posted Date

2021-01-19

First Open Access (FOA) Date

2021-01-19

First Compliant Deposit (FCD) Date

2021-01-18

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