A Preliminary Indication of Evolution of Type Ia Supernovae from their Risetimes

Details A Preliminary Indication of Evolution of Type Ia Supernovae from their Risetimes A Preliminary Indication of Evolution of Type Ia Supernovae from their Risetimes

1999-07-02

arxiv.org/abs/astro-ph/9907038v2

Astron.J. 118 (1999) 2668-2674

Astronomy and Astrophysics

Astrophysics

Accepted by the Astronomical Journal, 11 pages, 5 figures

Scientific paper

10.1086/301144

We have compared the risetime for samples of nearby and high-redshift type Ia supernovae (SNe Ia). The fiducial risetime of the nearby SNe Ia is 2.5+/-0.4 days longer than the proemial risetime determined by Goldhaber (1998a,b) for high-redshift SNe Ia from the Supernova Cosmology Project. The statistical likelihood that the two samples have different fiducial risetimes is high (5.8 sigma) and indicates possible evolution between the samples of SNe Ia. We consider the likely effects of several sources of systematic error, but none of these resolves the difference in the risetimes. Currently, we cannot directly determine the impact of the apparent evolution on previous determinations of cosmological parameters.

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