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

Garavini, G. / Folatelli, G. / Nobili, S. / Aldering, G. / Amanullah, R. / Antilogus, P. / Astier, P. / Blanc, G. / Bronder, J. / Burns, M. S. / Conley, A. / Deustua, S. E. / Doi, M. / Fabbro, S. / Fadeyev, V. / Gibbons, R. / Goldhaber, G. / Goobar, A. / Groom, D. E. / Hook, I. / Howell, D. A. / Kashikawa, N. / Kim, A. G. / Kowalski, M. / Kuznetsova, N. / Lee, B. C. / Lidman, C. / Mendez, J. / Morokuma, T. / Motohara, K. / Nugent, P. E. / Pain, R. / Perlmutter, S. / Quimby, R. / Raux, J. / Regnault, N. / Ruiz-Lapuente, P. / Sainton, G. / Schahmaneche, K. / Smith, E. / Spadafora, A. L. / Stanishev, V. / Thomas, R. C. / Walton, N. A. / Wang, L. / Wood-Vasey, W. M. / Yasuda, N. - 2015
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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