UV Properties of Type Ia Supernova and their Host Galaxies

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 (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 dependance 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.

8 pages, 6 figures. Accepted for publication in Astrophysics & Space Science Special Issue UV Astronomy, Astrophysics, and Instrumentation. Proceedings from the UV Universe 2010 Conference

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• A High-Resolution Spectroscopic Search for the Remaining Donor for Tycho's Supernova
• Constraints on Type Ia Supernova Progenitor Companions from Early Ultraviolet Observations with Swift
• A Bright Ultraviolet Excess in the Transitional 02es-like Type Ia Supernova 2019yvq
• The X-ray/radio and UV luminosity expected from symbiotic systems as the progenitor of SNe Ia