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

  • Author(s): Garavini, G;
  • Folatelli, G;
  • Nobili, S;
  • Aldering, G;
  • Amanullah, R;
  • Antilogus, P;
  • Astier, P;
  • Blanc, G;
  • Bronder, T;
  • Burns, MS;
  • Conley, A;
  • Deustua, SE;
  • Doi, M;
  • Fabbro, S;
  • Fadeyev, V;
  • Gibbons, R;
  • Goldhaber, G;
  • Goobar, A;
  • Groom, DE;
  • Hook, I;
  • Howell, DA;
  • Kashikawa, N;
  • Kim, AG;
  • Kowalski, M;
  • Kuznetsova, N;
  • Lee, BC;
  • Lidman, C;
  • Mendez, J;
  • Morokuma, T;
  • Motohara, K;
  • Nugent, PE;
  • Pain, R;
  • Perlmutter, S;
  • Quimby, R;
  • Raux, J;
  • Regnault, N;
  • Ruiz-Lapuente, P;
  • Sainton, G;
  • Schahmaneche, K;
  • Smith, E;
  • Spadafora, AL;
  • Stanishev, V;
  • Thomas, RC;
  • Walton, NA;
  • Wang, L;
  • Wood-Vasey, WM;
  • Yasuda, N
  • et al.
Abstract

We develop a method to measure the strength of the absorption features in type la supernova (SN la) spectra and use it to make a quantitative comparisons between the spectra of type la supernovae at low and high redshifts. In this case study, we apply the method to 12 high-redshift (0.212 ≤ z ≤ 0.912) SNe la 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 la (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. © ESO 2007.

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