Predicted Evolution in the Mean Properties of SNe Ia from SNLS Data

Details Predicted Evolution in the Mean Properties of SNe Ia from SNLS Data Predicted Evolution in the Mean Properties of SNe Ia from SNLS Data

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20922904h&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #229.04; Bulletin of the American Astronomical Society,

Astronomy and Astrophysics

Astronomy

Scientific paper

Recent results indicate that SNe Ia with broader lightcurves have a rate proportional to the star formation rate in their host galaxies. Thus, as star formation increases with redshift, these brighter SNe Ia should start to dominate the total sample. Here we use the two component model of Scannapieco & Bildsten (2006), and data from the Supernova Legacy Survey (SNLS) to make an empirical prediction of the evolution of mean SN Ia properties with redshift. We find that on average supernovae should become intrinsically brighter with increasing redshift. The nuber of exotic supernovae, such as SNLS-03D3bb, thought to be from a super-Chandrasekhar mass progenitor, should also increase. We test these predictions on 3rd year data from the SNLS, and examine possible effects on cosmology.

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