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

Abstract : 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.
Keywords : Astrophysics
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http://hal.in2p3.fr/in2p3-00142917
Contributor : Dominique Girod <>
Submitted on : Monday, April 23, 2007 - 3:56:06 PM
Last modification on : Tuesday, December 10, 2019 - 4:58:08 PM

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G. Garavini, G. Folatelli, S. Nobili, G. Aldering, R. Amanullah, et al.. Quantitative comparison between type Ia supernova spectra at low and high redshifts: A case study. Astronomy and Astrophysics - A&A, EDP Sciences, 2007, 470, pp.411-424. ⟨10.1051/0004-6361:20065400⟩. ⟨in2p3-00142917⟩

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