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We examine the correlation between supernova host galaxy properties and theirresiduals on the Hubble diagram. We use supernovae discovered during the SloanDigital Sky Survey II - Supernova Survey, and focus on objects at a redshift ofz < 0.15, where the selection effects of the survey are known to yield acomplete Type Ia supernova sample. To minimize the bias in our analysis withrespect to measured host-galaxy properties, spectra were obtained for nearlyall hosts, spanning a range in magnitude of -23 < M_r < -17. In contrast toprevious works that use photometric estimates of host mass as a proxy forglobal metallicity, we analyze host-galaxy spectra to obtain gas-phasemetallicities and star-formation rates from host galaxies with active starformation. From a final sample of ~ 40 emission-line galaxies, we find thatlight-curve corrected Type Ia supernovae are ~ 0.1 magnitudes brighter inhigh-metallicity hosts than in low-metallicity hosts. We also find asignificant (> 3{\sigma}) correlation between the Hubble residuals of Type Iasupernovae and the specific star-formation rate of the host galaxy. We commenton the importance of supernova/host-galaxy correlations as a source ofsystematic bias in future deep supernova surveys.

Spectroscopic Properties of Star-Forming Host Galaxies and Type Ia Supernova Hubble Residuals in a Nearly Unbiased Sample