Correlations between SNe Ia Rates and Host Galaxy Properties

Abstract

Studying the correlation of type Ia supernova rates (SNR) with host galaxy properties is an important step in understanding the exact nature of type Ia supernovae. We use SNe Ia from the SDSS-II sample, spectroscopically determined masses and star formation rates, and a new maximum likelihood method, to fit the Scannapieco and Bildsten rate model $SNR=A\times M+B\times SFR$, where $M$ is galaxy mass and $SFR$ is star formation rate. We find $A=3.5_{-0.7}^{+0.9}\times 10^{-14}(\text{SNe/yr})(M_{\odot }{)}^{-1}$ and $B=1.3_{-0.3}^{+0.4}\times 10^{-3}(\text{SNe/yr})(M_{\odot }$yr${}^{-1}{)}^{-1}$, assuming overall efficiency of 0.5. This is in reasonable agreement with other determinations. However we find strong evidence that this model is a poor fit to other projections of the data: it fails to correctly predict the distribution of supernovae with host mass or SFR. An additional model parameter is required; most likely this parameter is related to host galaxy mass. Some implications of this result are discussed.

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• Type Ia Supernovae: Colors, Rates, and Progenitors
• Exploring metallicity-dependent rates of Type Ia supernovae and their impact on galaxy formation
• The Delay Times of Type Ia Supernova
• Host Galaxy Spectra and Consequences for SN Typing From The SDSS SN Survey
• SNe Ia as a cosmological probe
• Reconciling Volumetric and Individual Galaxy Type Ia Supernova Rates