The Rise Time of Type Ia Supernovae from the Supernova Legacy Survey

Abstract

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 $19.10_{-0.17}^{+0.18}(stat)\pm 0.2(syst)$ and $19.58_{-0.19}^{+0.22}$ 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.

Accepted for publication in AJ; minor changes (spelling and grammatical) to conform with published version

References in corpus (1)

• Rates and properties of type Ia supernovae as a function of mass and star-formation in their host galaxies

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