Dependence of low redshift Type Ia Supernovae luminosities on host galaxies

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}.