Other
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21342513h&link_type=abstract
American Astronomical Society, AAS Meeting #213, #425.13; Bulletin of the American Astronomical Society, Vol. 41, p.254
Other
1
Scientific paper
We analyze the rise-time of over 300 type Ia supernova light curves from the Sloan Digital Sky Survey II (SDSS-II) Supernova Survey. The SDSS-II Supernova Survey was a three-year search covering 300 square-degrees of sky every two days. The relatively low redshift of the 500 spectroscopically confirmed type Ia supernovae (z<0.4) and the rapid candence makes this data set ideal for rise-time analysis. We apply a new fitting method which uses a time-axis stretch applied independently to the pre- and post- maximum phases of the light curve. This "2-stretch" fitting method allows for a more general analysis of the shape of type Ia SN light curves than the common single stretch model or other template fitting algorithms. The 2-stretch method is applied to a well-observed low-redshift sample analyzed by Strovink (2007) who found that there are two distinct shapes that occur in type Ia SN light curves. At low-redshift, our 2-stretch fitter is in general agreement with the more complicated fitting procedure of Strovink. Applied to the best light curves in the SDSS data, we find a wide range of rise times for a "normal" type Ia supernova, but the average rise-time to maximum light in B and V-bands is shorter than the previously accepted value of 19.5 days. We also find a suggestion of a bimodal distribution in the rise minus fall times for type Ia supernovae.
Garnavich Peter
Hayden Brian
Survey SDSS-II SN
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