Contributors: Meldorf, C.; Palmese, A.; Brout, D.; Chen, R.; Scolnic, D.; Kelsey, L.; Galbany, L.; Hartley, W. G.; Davis, T. M.; Drlica-Wagner, A.; Vincenzi, M.; Annis, J.; Dixon, M.; Graur, O.; Lidman, C.; Möller, A.; Nugent, P.; Rose, B.; Smith, M.; Allam, S.; Tucker, D. L.; Asorey, J.; Calcino, J.; Carollo, D.; Glazebrook, K.; Lewis, G. F.; Taylor, G.; Tucker, B. E.; Kim, A. G.; Diehl, H. T.; Aguena, M.; Andrade-Oliveira, F.; Bacon, D.; Bertin, E.; Bocquet, S.; Brooks, D.; Burke, D. L.; Carretero, J.; Carrasco Kind, M.; Castander, F. J.; Costanzi, M.; da Costa, L. N.; Desai, S.; Doel, P.; Everett, S.; Ferrero, I.; Friedel, D.; Frieman, J.; García-Bellido, J.; Gatti, M.; Gruen, D.; Gschwend, J.; Gutierrez, G.; Hinton, S. R.; Hollowood, D. L.; Honscheid, K.; James, D. J.; Kuehn, K.; March, M.; Marshall, J. L.; Menanteau, F.; Miquel, R.; Morgan, R.; Paz-Chinchón, F.; Pereira, M. E. S.; Plazas Malagón, A. A.; Sanchez, E.; Scarpine, V.; Sevilla-Noarbe, I.; Suchyta, E.; Tarle, G.; Varga, T. N.; Des, Collaboration
نبذة مختصرة : Cosmological analyses with type Ia supernovae (SNe Ia) often assume a single empirical relation between colour and luminosity (beta) and do not account for varying host-galaxy dust properties. However, from studies of dust in large samples of galaxies, it is known that dust attenuation can vary significantly. Here, we take advantage of state-of-the-art modelling of galaxy properties to characterize dust parameters (dust attenuation A(V), and a parameter describing the dust law slope R-V) for 1100 Dark Energy Survey (DES) SN host galaxies. Utilizing optical and infrared data of the hosts alone, we find three key aspects of host dust that impact SN cosmology: (1) there exists a large range (similar to 1-6) of host R-V; (2) high-stellar mass hosts have R-V on average similar to 0.7 lower than that of low-mass hosts; (3) for a subsample of 81 spectroscopically classified SNe there is a significant (>3 sigma) correlation between the Hubble diagram residuals of red SNe Ia and the host R-V that when corrected for reduces scatter by similar to 13 per cent and the significance of the 'mass step' to similar to 1 sigma . These represent independent confirmations of recent predictions based on dust that attempted to explain the puzzling 'mass step' and intrinsic scatter (sigma(int)) in SN Ia analyses.
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