Dependence of low redshift Type Ia Supernovae luminosities on host galaxies

TL;DR

This study investigates how the luminosities of low redshift Type Ia Supernovae vary with host galaxy properties, revealing significant correlations with host luminosity, size, and galaxy type after light curve correction.

Contribution

It provides new evidence that host galaxy characteristics influence SNe Ia luminosities, which is crucial for improving cosmological distance measurements.

Findings

SNe Ia in passive hosts are brighter than in star-forming hosts after correction.

SNe Ia in high luminosity hosts are brighter after correction.

Residuals linearly depend on host luminosity and size.

Abstract

We study the relation of Type Ia Supernovae (SNe Ia) with host galaxies from a large low redshift sample. By examining the Hubble residuals of the entire sample from the best-fit cosmology, we show that SNe Ia in passive hosts are brighter than those in star-forming hosts after light curve correction at 2.1{\sigma}confidence level. We find that SNe Ia in high luminosity hosts are brighter after light-curve correction at>3{\sigma}confidence level. We also find that SNe Ia in large size galaxies are brighter after light-curve correction at?2{\sigma} confidence level. We demonstrate that the residual linearly depends on host luminosity at a confidence of 4{\sigma}or host size at a confidence of 3.3{\sigma}.