Early-type Host Galaxies of Type Ia Supernovae. I. Evidence for Downsizing

TL;DR

This study investigates the relationship between host galaxy properties and Type Ia supernova luminosity, finding that galaxy age correlates with mass and may influence cosmological measurements, highlighting potential systematic uncertainties.

Contribution

First spectroscopic survey of early-type SN Ia host galaxies linking galaxy age to mass, supporting the downsizing trend and its impact on supernova luminosity evolution.

Findings

Significant correlation between host galaxy mass and stellar population age.

No correlation found between metallicity and galaxy mass.

Implication that stellar age influences supernova luminosity residuals.

Abstract

Type Ia supernova (SN Ia) cosmology provides the most direct evidence for the presence of dark energy. This result is based on the assumption that the look-back time evolution of SN Ia luminosity, after light-curve corrections, would be negligible. Recent studies show, however, that the Hubble residual (HR) of SN Ia is correlated with the mass and morphology of host galaxies, implying the possible dependence of SN Ia luminosity on host galaxy properties. In order to investigate this more directly, we have initiated spectroscopic survey for the early-type host galaxies, for which population age and metallicity can be more reliably determined from the absorption lines. As the first paper of the series, here we present the results from high signal-to-noise ratio (>100 per pixel) spectra for 27 nearby host galaxies in the southern hemisphere. For the first time in host galaxy studies, we find a significant (~3.9sigma) correlation between host galaxy mass (velocity dispersion) and population age, which is consistent with the "downsizing" trend among non-host early-type galaxies. This result is rather insensitive to the choice of population synthesis models. Since we find no correlation with metallicity, our result suggests that stellar population age is mainly responsible for the relation between host mass and HR. If confirmed, this would imply that the luminosity evolution plays a major role in the systematic uncertainties of SN Ia cosmology.