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


  • 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 <3 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 0.0980.018mag; 0.03mag greater than the largest global stellar mass step in our sample (0.0700.017mag). When splitting at the sample median, differences between local and global U R steps are small, both 0.08mag, but are more significant than the global stellar mass step (0.0570.017mag). 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 0.14mag. Additionally, the bluer (star-forming) local environments host a more homogeneous SN Ia sample, with local U R rms scatter as low as 0.0840.017mag for blue (c > 0) SNe Ia in locally blue U R environments.

published proceedings


altmetric score

  • 17.18

author list (cited authors)

  • Kelsey, L., Sullivan, M., Smith, M., Wiseman, P., Brout, D., Davis, T. M., ... Wilkinson, R. D.

citation count

  • 18

complete list of authors

  • Kelsey, L||Sullivan, M||Smith, M||Wiseman, P||Brout, D||Davis, TM||Frohmaier, C||Galbany, L||Grayling, M||Gutiérrez, CP||Hinton, SR||Kessler, R||Lidman, C||Möller, A||Sako, M||Scolnic, D||Uddin, SA||Vincenzi, M||Abbott, TMC||Aguena, M||Allam, S||Annis, J||Avila, S||Bacon, D||Bertin, E||Brooks, D||Burke, DL||Carnero Rosell, A||Carrasco Kind, M||Carretero, J||Castander, FJ||Costanzi, M||da Costa, LN||Desai, S||Diehl, HT||Doel, P||Everett, S||Ferrero, I||Ferté, A||Flaugher, B||Fosalba, P||García-Bellido, J||Gerdes, DW||Gruen, D||Gruendl, RA||Gschwend, J||Gutierrez, G||Hollowood, DL||Honscheid, K||James, DJ||Kim, AG||Kuehn, K||Kuropatkin, N||Lahav, O||Lima, M||Marshall, JL||Martini, P||Menanteau, F||Miquel, R||Morgan, R||Ogando, RLC||Palmese, A||Paz-Chinchón, F||Plazas, AA||Romer, AK||Sánchez, C||Sanchez, E||Serrano, S||Sevilla-Noarbe, I||Suchyta, E||Tarle, G||Thomas, D||To, C||Varga, TN||Walker, AR||Wilkinson, RD

publication date

  • December 2021