Quantitative comparison between Type Ia supernova spectra at low and high redshifts: A case study

Details Quantitative comparison between Type Ia supernova spectra at low and high redshifts: A case study Quantitative comparison between Type Ia supernova spectra at low and high redshifts: A case study

2007-03-24

arxiv.org/abs/astro-ph/0703629v1

Astronomy and Astrophysics

Astrophysics

accepted for publication on A&A

Scientific paper

10.1051/0004-6361:20065400

We develop a method to measure the strength of the absorption features in Type Ia supernova (SN Ia) spectra and use it to make a quantitative comparison between the spectra of Type Ia supernovae at low and high redshifts. In this case study, we apply the method to 12 high-redshift (0.212 < z < 0.912) SNe Ia observed by the Supernova Cosmology Project . Through measurements of the strengths of these features and of the blueshift of the absorption minimum in Ca II H&K, we show that the spectra of the high-redshift SNe Ia are quantitatively similar to spectra of nearby SNe Ia (z < 0.15). One supernova in our high redshift sample, SN 2002fd at z=0.279, is found to have spectral characteristics that are associated with peculiar SN 1991T/SN 1999aa-like supernovae.

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