Correlations between Type Ia SNe and Host Galaxy Spectra

Details Correlations between Type Ia SNe and Host Galaxy Spectra Correlations between Type Ia SNe and Host Galaxy Spectra

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21914311m&link_type=abstract

American Astronomical Society, AAS Meeting #219, #143.11

Physics

Scientific paper

We have obtained deep, very high signal-to-noise ratio spectra of a sample of 40 host galaxies of Type Ia supernovae (SNe). The host galaxies are chosen from the Nearby SN Factory, the SDSS SN Survey, and Swift-observed SNe, with the requirement that they have early-type morphologies and passive stellar populations. We perform a detailed stellar population analysis of the SN host galaxies, measuring their ages and the abundances of multiple elements, including C, N, Mg, Ca, and Fe. We find that the abundance patterns of the SN hosts are similar to those of a control sample of early-type SDSS galaxies. However, a significant fraction, 30%, show substantially younger mean stellar population ages, implying that 30% of early-type hosted SNe Ia are associated with recent star formation. Additionally, we attempt to pinpoint the physics underlying the host mass -- SN Ia Hubble residual relation by investigating correlations between the host galaxy spectral properties and SN light curve properties.

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