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

  title={Quantitative comparison between Type Ia supernova spectra at low and high redshifts: A case study},
  author={Gabriele Garavini and Gast{\'o}n Folatelli and Serena Nobili and Greg Aldering and Rahman Amanullah and P. Antilogus and Pierre Astier and Guillaume Blanc and J. Bronder and M. Shane Burns and Alex Conley and Susana E. Deustua and Masao Doi and S{\'e}bastien Fabbro and Vitaliy Fadeyev and Robert D. Gibbons and Gerson. Goldhaber and Ariel Goobar and Donald E. Groom and Isobel M. Hook and D. Andrew Howell and Nobunari Kashikawa and Alex G Kim and Marek Kowalski and Natalia Kuznetsova and B. C. Lee and Christopher E. Lidman and Javier M{\'e}ndez and Tomoki Morokuma and Kentaro Motohara and Peter E. Nugent and R. Pain and Steve I. Perlmutter and Robert M. Quimby and Julie Raux and Nicolas Regnault and Pilar Ruiz-Lapuente and Gr{\'e}gory Sainton and Kyan Schahmaneche and E. P. Smith and Anthony Louis Spadafora and Vallery Stanishev and R. C. Thomas and Nicholas A. Walton and L. Wang and W. Michael Wood-Vasey and NautaNurmi –project},
  journal={Astronomy and Astrophysics},
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… 

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