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The SNLS-VLT Type Ia Spectrum Evolution with Redshift: a Demographic Effect?

Published online by Cambridge University Press:  17 January 2013

Christophe Balland
Affiliation:
LPNHE, Universités Paris 6 & 7, 4 Place Jussieu, 75252 Paris Cedex 05, France email: balland@lpnhe.in2p3.fr Université Paris 11, Orsay, F-91405, France
Martine Mouchet
Affiliation:
APC, Université Paris Diderot - Paris 7, 10, Rue Alice Domon et Léonie Duquet, 75205 Paris Cedex 13, France email: martine.mouchet@obspm.fr
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Abstract

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We build composite spectra at z ≤ 0.5 and z > 0.5 from the 3 year SuperNova Legacy Survey (SNLS) VLT spectral sample and study their differences around maximum light. We use 93 spectra near maximum of confirmed SNe Ia observed at the VLT between 2003 and 2006 as part of the 3 first years of operation of the SNLS. We find differences in the absorption depth of some intermediate mass elements (Ca ii, Si ii). Average stretches of observed distributions are 0.975 ± 0.016 and 0.983 ± 0.014 for the z ≤ 0.5 and z > 0.5 sample respectively. We use the A+B model of Scannapieco & Bildsten (2005) to interpret these results in terms of a possible demographic evolution.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2013

References

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