UV properties of type Ia supernova and their host galaxies |
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| Authors: | Brad E Tucker |
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| Institution: | (1) European Southern Observatory, Karl-Schwarzschild-Strasse 2, D-85748 Garching, Germany |
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| Abstract: | Type Ia Supernova (SN Ia) are a powerful, albeit not completely understood, tool for cosmology. Gaps in our understanding
of their progenitors and detailed physics can lead to systematic errors in the cosmological distances they measure. We use
UV data in two context to help further our understanding of SN Ia progenitors and physics. We analyze a set of nearly 700
light curves, and find no signature of the shock heating of a red giant companion, predicted by Kasen (Astrophys. J. 708:1025,
2010), casting doubt as to frequency of this SN Ia channel. We also use UV imaging of high redshift host galaxies of SN Ia to
better understand the environments which SN Ia occur. We show that some high-z elliptical galaxies have current star formation, hindering efforts to use them as low-extinction environments. We show cosmological
scatter of SN distances at large effective radii in their hosts is significantly reduced, and argue this is due to the smaller
amounts of dust affecting the SN Ia. Finally, we find a two component dependence of SN distance measurements as a function
of their host galaxy’s FUV-V color. This indicates that both the age and metallicity/mass of the host galaxy maybe important
ingredients in measuring SN Ia distances. |
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