SDSS-II Supernova Survey: An Analysis of the Largest Sample of Type Ia
  Supernovae and Correlations with Host-Galaxy Spectral Properties
  Using the largest single-survey sample of Type Ia supernovae (SNe Ia) to
date, we study the relationship between properties of SNe Ia and those of their
host galaxies, focusing primarily on correlations with Hubble residuals (HR).
Our sample consists of 345 photometrically-classified or
spectroscopically-confirmed SNeIa discovered as part of the SDSS-II Supernova
Survey (SDSS-SNS). This analysis utilizes host-galaxy spectroscopy obtained
during the SDSS-I/II spectroscopic survey and from an ancillary program on the
SDSS-III Baryon Oscillation Spectroscopic Survey (BOSS) that obtained spectra
for nearly all host galaxies of SDSS-II SN candidates. In addition, we use
photometric host-galaxy properties from the SDSS-SNS data release (Sako et al.
2014) such as host stellar mass and star-formation rate. We confirm the
well-known relation between HR and host-galaxy mass and find a 3.6{\sigma}
significance of a non-zero linear slope. We also recover correlations between
HR and host-galaxy gas-phase metallicity and specific star-formation rate as
they are reported in the literature. With our large dataset, we examine
correlations between HR and multiple host-galaxy properties simultaneously and
find no evidence of a significant correlation. We also independently analyze
our spectroscopically-confirmed and photometrically-classified SNe Ia and
comment on the significance of similar combined datasets for future surveys.
