Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20915001f&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #150.01; Bulletin of the American Astronomical Society,
Astronomy and Astrophysics
Astronomy
Scientific paper
The largest known systematic error related to type-Ia supernova (SN Ia) distances is SN evolution from low to high redshift. The best method for constraining SN evolution is by looking at differences in spectral properties, especially in the UV. Since an individual high-z SN Ia spectrum typically has a low signal-to-noise ratio relative to low-z spectra, we have generated composite spectra from the sample of spectra of ESSENCE objects. Comparing the composite spectra, we see that high-z SNe Ia are very similar to low-z SNe Ia, however some slight differences in the UV may indicate a different metallicity for the progenitors. Even if these differences do not affect the luminosity, they will affect the K-corrections at high-z and as a result will affect the calculated distances.
ESSENCE Collaboration
Foley Ryan J.
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