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
Cite
@article{arxiv.astro-ph/0703629,
title = {Quantitative comparison between Type Ia supernova spectra at low and high redshifts: A case study},
author = {G. Garavini and G. Folatelli and S. Nobili and G. Aldering and R. Amanullah and P. Antilogus and P. Astier and G. Blanc and J. Bronder and M. S. Burns and A. Conley and S. E. Deustua and M. Doi and S. Fabbro and V. Fadeyev and R. Gibbons and G. Goldhaber and A. Goobar and D. E. Groom and I. Hook and D. A. Howell and N. Kashikawa and A. G. Kim and M. Kowalski and N. Kuznetsova and B. C. Lee and C. Lidman and J. Mendez and T. Morokuma and K. Motohara and P. E. Nugent and R. Pain and S. Perlmutter and R. Quimby and J. Raux and N. Regnault and P. Ruiz-Lapuente and G. Sainton and K. Schahmaneche and E. Smith and A. L. Spadafora and V. Stanishev and R. C. Thomas and N. A. Walton and L. Wang and W. M. Wood-Vasey and N. Yasuda. The Supernova Cosmology Project},
journal= {arXiv preprint arXiv:astro-ph/0703629},
year = {2009}
}
Comments
accepted for publication on A&A