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Duarte, J; González-Gaitán, S; Mourao, A; Paulino-Afonso, A; Guilherme-Garcia, P; Aguas, J; Galbany, L; Kelsey, L; Scolnic, D; Sullivan, M; Brout, D; Palmese, A; Wiseman, P; Pieres, A; Plazas Malagón, A A; A Carnero Rosell; C To; Gruen, D; Bacon, D; Brooks, D; Burke, D L; Gerdes, D W; James, D J; Hollowood, D L; Friedel, D; Bertin, E; Suchyta, E; Sanchez, E; Paz-Chinchón, F; Gutierrez, G; Tarle, G; Diehl, H T; Sevilla-Noarbe, I; Ferrero, I; Carretero, J; Frieman, J; De Vicente, J; García-Bellido, J; Honscheid, K; Kuehn, K; Gatti, M; Raveri, M; Pereira, M E S; Rodriguez-Monroy, M; Smith, M; M Carrasco Kind; Costanzi, M; Aguena, M; Kuropatkin, N; Weaverdyck, N; Alves, O; Doel, P; Melchior, P; Miquel, R; Gruendl, R A; Hinton, S R; Bocquet, S; Desai, S; Everett, S; Davis, T M; Scarpine, V
arXiv.org, 12/2023Paper, Journal Article
Type Ia supernovae (SNe Ia) are useful distance indicators in cosmology, provided their luminosity is standardized by applying empirical corrections based on light-curve properties. One factor behind these corrections is dust extinction, accounted for in the color-luminosity relation of the standardization. This relation is usually assumed to be universal, which could potentially introduce systematics into the standardization. The ``mass-step'' observed for SNe Ia Hubble residuals has been suggested as one such systematic. We seek to obtain a completer view of dust attenuation properties for a sample of 162 SN Ia host galaxies and to probe their link to the ``mass-step''. We infer attenuation laws towards hosts from both global and local (4 kpc) Dark Energy Survey photometry and Composite Stellar Population model fits. We recover a optical depth/attenuation slope relation, best explained by differing star/dust geometry for different galaxy orientations, which is significantly different from the optical depth/extinction slope relation observed directly for SNe. We obtain a large variation of attenuation slopes and confirm these change with host properties, like stellar mass and age, meaning a universal SN Ia correction should ideally not be assumed. Analyzing the cosmological standardization, we find evidence for a ``mass-step'' and a two dimensional ``dust-step'', both more pronounced for red SNe. Although comparable, the two steps are found no to be completely analogous. We conclude that host galaxy dust data cannot fully account for the ``mass-step'', using either an alternative SN standardization with extinction proxied by host attenuation or a ``dust-step'' approach.
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