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Type Ia Supernova(SN Ia) are a powerful, albeit not completely understood,tool for cosmology. Gaps in our understanding of their progenitors and detailedphysics can lead to systematic errors in the cosmological distances theymeasure. We use UV data in two context to help further our understanding of SNIa progenitors and physics. We analyze a set of nearly 700 light curves, andfind no signature of the shock heating of a red giant companion, predicted byKasen (2010), casting doubt as to frequency of this SN Ia channel. We also useUV imaging of high redshift host galaxies of SN Ia to better understand theenvironments which SN Ia occur. We show that some high-z elliptical galaxieshave current star formation, hindering efforts to use them as low-extinctionenvironments. We show cosmological scatter of SN distances at large effectiveradii in their hosts is significantly reduced, and argue this is due to thesmaller amounts of dust affecting the SN Ia. Finally, we find a two componentdependance of SN distance measurements as a function of their host galaxy'sFUV-V color. This indicates that both the age and metallicity/mass of the hostgalaxy maybe important ingredients in measuring SN Ia distances.

UV Properties of Type Ia Supernova and their Host Galaxies