A Sample of Dust Attenuation Laws for DES Supernova Host Galaxies
Abstract
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.
Keywords
Cite
@article{arxiv.2211.14291,
title = {A Sample of Dust Attenuation Laws for DES Supernova Host Galaxies},
author = {J. Duarte and S. González-Gaitán and A. Mourao and A. Paulino-Afonso and P. Guilherme-Garcia and J. Aguas and L. Galbany and L. Kelsey and D. Scolnic and M. Sullivan and D. Brout and A. Palmese and P. Wiseman and A. Pieres and A. A. Plazas Malagón and A. Carnero Rosell and C. To and D. Gruen and D. Bacon and D. Brooks and D. L. Burke and D. W. Gerdes and D. J. James and D. L. Hollowood and D. Friedel and E. Bertin and E. Suchyta and E. Sanchez and F. Paz-Chinchón and G. Gutierrez and G. Tarle and H. T. Diehl and I. Sevilla-Noarbe and I. Ferrero and J. Carretero and J. Frieman and J. De Vicente and J. García-Bellido and K. Honscheid and K. Kuehn and M. Gatti and M. Raveri and M. E. S. Pereira and M. Rodriguez-Monroy and M. Smith and M. Carrasco Kind and M. Costanzi and M. Aguena and N. Kuropatkin and N. Weaverdyck and O. Alves and P. Doel and P. Melchior and R. Miquel and R. A. Gruendl and S. R. Hinton and S. Bocquet and S. Desai and S. Everett and T. M. Davis and V. Scarpine},
journal= {arXiv preprint arXiv:2211.14291},
year = {2023}
}
Comments
20 pages, 10 figues, 9 tables. Supplementary material included (10 pages). Accepted for publication on A&A