Volume 499, Number 3, June I 2009
|Page(s)||653 - 660|
|Published online||08 April 2009|
The core-collapse rate from the Supernova Legacy Survey
CEA/Saclay, DSM/Irfu/Spp, 91191 Gif-sur-Yvette Cedex, France e-mail: firstname.lastname@example.org
2 APC, UMR 7164 CNRS, 10 rue Alice Domon et Léonie Duquet, 75205 Paris Cedex 13, France
3 LPNHE, CNRS-IN2P3 and Universities of Paris 6 & 7, 75252 Paris Cedex 05, France
4 University Paris 11, 91405 Orsay, France
5 LAM, CNRS, BP8, Pôle de l'étoile, Site de Château-Gombert, 38 rue Frédéric Joliot-Curie, 13388 Marseille Cedex 13, France
6 Deparment of Astronomy and Astrophysics, University of Toronto, 50 St. George Street, Toronto, ON M5S 3H8, Canada
7 CPPM, CNRS-Luminy, Case 907, 13288 Marseille Cedex 9, France
8 University of Oxford, Astrophysics, Denys Wilkinson Building, Kneble Road, Oxford OX1 3RH, UK
9 Department of Physics and Astronomy, University of Victoria, PO Box 3055, Victoria, BC V8W 3P6, Canada
10 CENTRA-Centro M. de Astrofisica and Department of Physics, IST, Lisbon, Portugal
11 European Southern Observatory, Alonso de Cordova 3107, Vitacura, Casilla 19001, Santiago 19, Chile
12 LUTH, UMR 8102 CNRS, Observatoire de Paris, Section de Meudon, 92195 Meudon Cedex, France
Accepted: 6 April 2009
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.
Key words: supernovae: general / stars: evolution / surveys
© ESO, 2009
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