Mathematics – Logic
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21343810s&link_type=abstract
American Astronomical Society, AAS Meeting #213, #438.10; Bulletin of the American Astronomical Society, Vol. 41, p.312
Mathematics
Logic
Scientific paper
The use of Type Ia Supernovae (SNe Ia) as precision probes of dark energy is susceptible to any evolution in their properties which cannot be empirically controlled. As SN Ia properties are known to depend on the characteristics of their progenitor stellar populations, and as the mix of galaxy types and ages evolves with redshift, some demographic shifts in the SN Ia population are expected. Using data from the CFHT Supernova Legacy Survey (SNLS), we test the extent to which these affect SNe Ia in two ways. We first examine the mean rest-frame ultraviolet spectrum, which theoretical models suggest is susceptible to changes in progenitor composition, at z=0, z=0.5 and z>1. Though differences are observed, in particular a decrease in the strength of intermediate mass elements with increasing redshift, they broadly match the expectations from various two-component SN Ia rate models coupled with a lightcurve-width dependent spectrum. We also test the universality of the calibrating relationship between SN Ia lightcurve width and peak luminosity used in cosmological applications, across a range of host galaxy ages and star formation rates. We find little evidence that the lightcurve width/luminosity relation has a significant dependence on identified external environmental factors. Thus, to the extent possible with these current datasets, our initial results support the continued use of SNe Ia as standardized cosmological candles.
Legacy Survey Supernova
Sullivan Mark
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