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Kelsey, L.; Sullivan, M.; Smith, M.; Wiseman, P.; Brout, D.; Davis, T. M.; Frohmaier, C.; Galbany, L.; Grayling, M.; Gutierrez, C. P.; Hinton, S. R.; Kessler, R.; Lidman, C.; Moller, A.; Sako, M.; Scolnic, D.; Uddin, S. A.; Vincenzi, M.; Abbott, T. M. C.; Aguena, M.; Allam, S.; Annis, J.; Avila, S.; Bacon, D.; Bertin, E.; Brooks, D.; Burke, D. L.; Rosell, A. Carnero; Kind, M. Carrasco; Carretero, J.; Castander, F. J.; Costanzi, M.; da Costa, L. N.; Desai, S.; Diehl, H. T.; Doel, P.; Everett, S.; Ferrero, I.; Ferte, A.; Flaugher, B.; Fosalba, P.; Garcia-Bellido, J.; Gerdes, D. W.; Gruen, D.; Gruendl, R. A.; Gschwend, J.; Gutierrez, G.; Hollowood, D. L.; Honscheid, K.; James, D. J.; Kim, A. G.; Kuehn, K.; Kuropatkin, N.; Lahav, O.; Lima, M.; Marshall, J. L.; Martini, P.; Menanteau, F.; Miquel, R.; Morgan, R.; Ogando, R. L. C.; Palmese, A.; Paz-Chinchon, F.; Plazas, A. A.; Romer, A. K.; Sanchez, C.; Sanchez, E.; Serrano, S.; Sevilla-Noarbe, I.; Suchyta, E.; Tarle, G.; Thomas, D.; To, C.; Varga, T. N.; Walker, A. R. and Wilkinson, R. D. (2021): The effect of environment on Type Ia supernovae in the Dark Energy Survey three-year cosmological sample. In: Monthly Notices of the Royal Astronomical Society, Vol. 501, No. 4: pp. 4861-4876

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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.

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