Constraining SN Ia Evolution

Details Constraining SN Ia Evolution Constraining SN Ia Evolution

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...21110705f&link_type=abstract

American Astronomical Society, AAS Meeting #211, #107.05; Bulletin of the American Astronomical Society, Vol. 39, p.935

Astronomy and Astrophysics

Astronomy

Scientific paper

Measurements of high-redshift type Ia supernovae (SNe Ia) have revealed that the expansion of the Universe is accelerating. A decade after this realization, our measurements of the nature of Dark Energy is dominated by systematics associated with supernovae. One such error is possible evolution between low and high-redshift SNe. As part of the ESSENCE survey, spectra of SNe are obtained to determine their type and redshift. A by-product of this effort is a large sample of low to moderate signal-to-noise SN Ia spectra. I present composite spectra of high-redshift SNe (and their low-redshift counterparts) using the cumulative signal of 100 high-redshift SN spectra to assess small differences between the two samples.

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