Type Ia supernova rate at a redshift of ~0.1

¹ DSM/DAPNIA, CEA/Saclay, 91191 Gif-sur-Yvette Cedex, France
² Osservatorio Astronomico di Padova, INAF, vicolo dell'Osservatorio 5, 35122 Padova, Italy e-mail: blanc@pd.astro.it
³ Université Paris 7 - Denis Diderot, 2 place Jussieu, 75005 Paris, France
⁴ Collège de France, Physique Corpusculaire et Cosmologie, IN2P3 CNRS, 11 pl. M. Berthelot, 75231 Paris Cedex, France
⁵ Department of Astronomy, New Mexico State University, Las Cruces, NM 88003-8001, USA
⁶ NASA/Ames Research Center, Mail Stop 244, Moffet Field, CA 94035, USA
⁷ GEPI, Observatoire de Paris, 77 avenue de l'Observatoire, 75014 Paris, France
⁸ Laboratoire de l'Accélérateur Linéaire, IN2P3 CNRS, Université Paris-Sud, 91405 Orsay Cedex, France
⁹ Lawrence Berkeley National Lab, 1 Cyclotron Road, Berkeley, CA 94720, USA
¹⁰ Astronomical Observatory, Copenhagen University, Juliane Maries Vej 30, 2100 Copenhagen, Denmark
¹¹ Laboratoire de Physique Nucléaire et de Hautes Énergies, IN2P3 - CNRS - Universités Paris 6 et Paris 7, 4 place Jussieu, 75252 Paris Cedex 05, France
¹² Institut d'Astrophysique Spatiale, Bâtiment 121, Université Paris 11, 91405 Orsay Cedex, France
¹³ Institut d'Astrophysique de Paris, INSU CNRS, 98 bis boulevard Arago, 75014 Paris, France
¹⁴ Space Telescope Science Institute, 3700 San Martin Dr., Baltimore, MD 21218, USA
¹⁵ Steward Observatory, The University of Arizona, 933 N. Cherry Ave, Tucson, AZ 85721-0065, USA
¹⁶ Department of Physics, Stockholm University, AlbaNova University Center, 106 91 Stockholm, Sweden
¹⁷ European Southern Observatory (ESO), Casilla 19001, Santiago 19, Chile
¹⁸ Observatoire Midi-Pyrénées, 14 avenue Edouard Belin, 31400 Toulouse, France
¹⁹ Departments of Astronomy and Physics, Ohio State University, Columbus, OH 43210, USA
²⁰ Department of Physics, University of Oxford, Nuclear and Astrophysics laboratory, Keble Road, Oxford OX1 3RH, UK
²¹ Fermilab Wilson and Kirk Roads, Batavia, IL 60510-0500, USA
²² Observatoire de Marseille, 2 pl. Le Verrier, 13248 Marseille Cedex 04, France
²³ LUTH, Observatoire de Paris, 5 place Jules Janssen, 92195 Meudon Cedex, France
²⁴ Rensselaer Polytechnic Institute, 110 Eighth Street, Troy, NY 12180, USA
²⁵ Laboratoire Leprince-Ringuet, LLR/École Polytechnique, Route de Saclay, 91128 Palaiseau Cedex, France
²⁶ Department of Astronomy, University of Barcelona, Barcelona, Spain
²⁷ Institute of Astronomy, Madingley Road, Cambridge CB3 0HA, UK

Received: 24 December 2003
Accepted: 28 April 2004

Abstract

We present the type Ia rate measurement based on two EROS supernova search campaigns (in 1999 and 2000). Sixteen supernovae identified as type Ia were discovered. The measurement of the detection efficiency, using a Monte Carlo simulation, provides the type Ia supernova explosion rate at a redshift ~0.13. The result is SNu where 1 SNu = 1 SN / / century. This value is compatible with the previous EROS measurement [CITE], done with a much smaller sample, at a similar redshift. Comparison with other values at different redshifts suggests an evolution of the type Ia supernova rate.