The effect of environment on Type Ia supernovae in the Dark Energy Survey three-year cosmological sample
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Oxford University Press
SurveysSupernovae: generalDistance scaleCosmology: observations
Monthly Notices of the Royal Astronomical Society, Volume 501, Issue 4, March 2021, Pages 4861–4876, [https://doi.org/10.1093/mnras/staa3924]
SponsorshipScience and Technology Facilities Council through the DISCnet Centre forDoctoral Training ST/P006760/1; EU/FP7-ERC grant 615929; UK Research & Innovation (UKRI) Science & Technology Facilities Council (STFC) ST/R000506/1; European Commission 839090; Spanish grant within the European Funds for Regional Development (FEDER) PGC2018-095317-B-C21; United States Department of Energy (DOE); National Science Foundation (NSF); Spanish Government; UK Research & Innovation (UKRI) Science & Technology Facilities Council (STFC); Higher Education Funding Council for England; National Center for Supercomputing Applications at the University of Illinois at Urbana-Champaign; Ohio State University; Mitchell Institute for Fundamental Physics and Astronomy at Texas AM University; Ciencia Tecnologia e Inovacao (FINEP); Fundacao Carlos Chagas Filho de Amparo a Pesquisa do Estado do Rio de Janeiro; National Council for Scientific and Technological Development (CNPq); Ministerio da Ciencia, Tecnologia e Inovacao; German Research Foundation (DFG); University of California at Santa Cruz; University of Cambridge; Centro de Investigaciones Energeticas, Medioambientales y Tecnologicas-Madrid; ETH Zurich; United States Department of Energy (DOE) University of Chicago; University of Illinois at Urbana Champaign; Institut de Ciencies de l'Espai (IEEC/CSIC); Institut de Fisica d'Altes Energies; United States Department of Energy (DOE); Ludwig-Maximilians Universit at Munchen and the associated Excellence Cluster Universe; University of Michigan System; National Science Foundation (NSF) NSF - Directorate for Mathematical & Physical Sciences (MPS); University of Nottingham; Ohio State University; University of Pennsylvania; University of Portsmouth; Stanford University; University of Sussex; Texas AM University; OzDES Membership Consortium; National Science Foundation (NSF) AST-1138766 AST-1536171; MINECO AYA2015-71825 ESP2015-66861 FPA2015-68048 SEV-2016-0588 SEV-2016-0597 MDM-2015-0509; ERDF funds from the European Union; CERCA program of the Generalitat de Catalunya; European Research Council under the European Union's Seventh Framework Program (FP7/2007-2013); European Research Council (ERC) European Commission 240672 291329 306478; National Council for Scientific and Technological Development (CNPq) 465376/2014-2; Kavli Institute of Cosmological Physics at the University of Chicago; University College London; DES-Brazil Consortium; University of Edinburgh
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 sigma 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 +/- 0.018mag; similar to 0.03mag greater than the largest global stellar mass step in our sample (0.070 +/- 0.017mag). When splitting at the sample median, differences between local and global U - R steps are small, both similar to 0.08mag, but are more significant than the global stellar mass step (0.057 +/- 0.017mag). We split the data into sub-samples based on SN Ia light-curve parameters: stretch (x(1)) 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 similar to 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 0.084 +/- 0.017mag for blue (c < 0) SNe Ia in locally blue U - R environments.