Type Ia Supernova Properties as a Function of the Distance to the Host Galaxy in the SDSS-II SN Survey

TL;DR

This study investigates how properties of Type Ia supernovae vary with their distance from host galaxy centers, revealing significant correlations in spiral galaxies and limited effects on standardized luminosities.

Contribution

It provides the first detailed analysis of SN Ia properties as a function of galactocentric distance using a large SDSS-II sample, highlighting environmental influences.

Findings

AV and color parameters decrease with distance in spiral galaxies

SNe in elliptical galaxies show narrower light-curves at larger distances

No strong correlation between standardized SN magnitudes and host metallicity

Abstract

We use type-Ia supernovae (SNe Ia) discovered by the SDSS-II SN Survey to search for dependencies between SN Ia properties and the projected distance to the host galaxy center, using the distance as a proxy for local galaxy properties (local star-formation rate, local metallicity, etc.). The sample consists of almost 200 spectroscopically or photometrically confirmed SNe Ia at redshifts below 0.25. The sample is split into two groups depending on the morphology of the host galaxy. We fit light-curves using both MLCS2k2 and SALT2, and determine color (AV, c) and light-curve shape (delta, x1) parameters for each SN Ia, as well as its residual in the Hubble diagram. We then correlate these parameters with both the physical and the normalized distances to the center of the host galaxy and look for trends in the mean values and scatters of these parameters with increasing distance. The most significant (at the 4-sigma level) finding is that the average fitted AV from MLCS2k2 and c from SALT2 decrease with the projected distance for SNe Ia in spiral galaxies. We also find indications that SNe in elliptical galaxies tend to have narrower light-curves if they explode at larger distances, although this may be due to selection effects in our sample. We do not find strong correlations between the residuals of the distance moduli with respect to the Hubble flow and the galactocentric distances, which indicates a limited correlation between SN magnitudes after standardization and local host metallicity.