The core-collapse rate from the Supernova Legacy Survey
Open Access
- 8 April 2009
- journal article
- research article
- Published by EDP Sciences in Astronomy & Astrophysics
- Vol. 499 (3), 653-660
- https://doi.org/10.1051/0004-6361/200911847
Abstract
We use three years of data from the Supernova Legacy Survey (SNLS) to study the general properties of core-collapse and type Ia supernovae. This is the first such study using the “rolling search” technique which guarantees well-sampled SNLS light curves and good efficiency for supernovae brighter than ~24. Using host photometric redshifts, we measure the supernova absolute magnitude distribution down to luminosities 4.5 mag fainter than normal SNIa. Using spectroscopy and light-curve fitting to discriminate against SNIa, we find a sample of 117 core-collapse supernova candidates with redshifts z < 0.4 (median redshift of 0.29) and measure their rate to be larger than the type Ia supernova rate by a factor 4.5±0.8(stat.)±0.6 (sys.). This corresponds to a core-collapse rate at z = 0.3 of [ 1.42±0.3(stat.)±0.3(sys.)] 10-4 yr-1( Mpc)-3.Keywords
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