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Astronomical Journal 132 (2006) 1707-1713
The Rise Time of Type Ia Supernovae from the Supernova Legacy Survey
A. Conley, D. A. Howell, A. Howes, M. Sullivan, P. Astier1, D. Balam, S. Basa2, R.G. Carlberg, D. Fouchez3, J. Guy1, I. Hook, J.D. Neill, R. Pain1, K. Perrett, C.J. Pritchet, N. Regnault1, J. Rich4, Richard Taillet1, 5, E. Aubourg4, 6, J. Bronder, R.S. Ellis, S. Fabbro, M. Filiol2, D. Le Borgne4, N. Palanque-Delabrouille4, S. Perlmutter, P. Ripoche3
SNLS Collaboration(s)

We compare the rise times of nearby and distant Type Ia supernovae (SNe Ia) as a test for evolution using 73 high-redshift spectroscopically-confirmed SNe Ia from the first two years of the five year Supernova Legacy Survey (SNLS) and published observations of nearby SN. Because of the ''rolling'' search nature of the SNLS, our measurement is approximately 6 times more precise than previous studies, allowing for a more sensitive test of evolution between nearby and distant supernovae. Adopting a simple $t^2$ early-time model (as in previous studies), we find that the rest-frame $B$ rise times for a fiducial SN Ia at high and low redshift are consistent, with values $19.10^{+0.18}_{-0.17}({stat}) \pm 0.2 ({syst})$ and $19.58^{+0.22}_{-0.19}$ days, respectively; the statistical significance of this difference is only 1.4 \sg . The errors represent the uncertainty in the mean rather than any variation between individual SN. We also compare subsets of our high-redshift data set based on decline rate, host galaxy star formation rate, and redshift, finding no substantive evidence for any subsample dependence.
1 :  LPNHE - Laboratoire de Physique Nucléaire et de Hautes Énergies
2 :  LAM - Laboratoire d'Astrophysique de Marseille
3 :  CPPM - Centre de Physique des Particules de Marseille
4 :  DAPNIA - Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée
5 :  Université de Savoie
6 :  APC - UMR 7164 - AstroParticule et Cosmologie
APC - Cosmologie et Gravitation
Physique/Astrophysique/Cosmologie et astrophysique extra-galactique

Planète et Univers/Astrophysique/Cosmologie et astrophysique extra-galactique

Planète et Univers/Astrophysique
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