A Sample of Dust Attenuation Laws for DES Supernova Host Galaxies

Understand

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.