SUBLUMINOUS TYPE Ia SUPERNOVAE AT HIGH REDSHIFT FROM THE SUPERNOVA LEGACY SURVEY

Journal Article · Tue Feb 01 04:00:00 EST 2011 · Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/727/2/107· OSTI ID:21567529

Gonzalez-Gaitan, S; Perrett, K; Conley, A; Carlberg, R G ^[1]; Sullivan, M ^[2]; Howell, D A ^[3]; Astier, P; Balland, C; Guy, J; Hardin, D; Pain, R; Regnault, N ^[4]; Balam, D; Hook, I M ^[5]; Basa, S ^[6]; Fouchez, D ^[7]; Pritchet, C J ^[8]; Rich, J ^[9]; Lidman, C ^[10]

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1. Department of Astronomy and Astrophysics, University of Toronto, 50 St. George Street, Toronto, ON, M5S 3H4 (Canada)
2. Department of Physics (Astrophysics), University of Oxford, DWB, Keble Road, Oxford, OX1 3RH (United Kingdom)
3. Las Cumbres Observatory Global Telescope Network, 6740 Cortona Dr., Suite 102, Goleta, CA 93117 (United States)
4. LPNHE, Universite Pierre et Marie Curie Paris 6, Universite Paris Diderot Paris 7, CNRS-IN2P3, 4 Place Jussieu, 75252 Paris Cedex 05 (France)
5. Dominion Astrophysical Observatory, Herzberg Institute of Astrophysics, 5071 West Saanich Road, Victoria, BC, V9E 2E7 (Canada)
6. Laboratoire d'Astrophysique de Marseille, Pole de l'Etoile Site de Chateau-Gombert, 38, rue Frederic Joliot-Curie, 13388 Marseille Cedex 13 (France)
7. CPPM, CNRS-IN2P3 and University Aix Marseille II, Case 907, 13288 Marseille Cedex 9 (France)
8. Department of Physics and Astronomy, University of Victoria, P.O. Box 3055, Stn CSC, Victoria, BC, V8W 3P6 (Canada)
9. DSM/IRFU/SPP, CEA-Saclay, F-91191 Gif-sur-Yvette (France)
10. Australian Astronomical Observatory, P.O. Box 296, Epping, NSW 1710 (Australia)

The rate evolution of subluminous Type Ia supernovae (SNe Ia) is presented using data from the Supernova Legacy Survey. This sub-sample represents the faint and rapidly declining light curves of the observed SN Ia population here defined by low-stretch values (s {<=} 0.8). Up to redshift z = 0.6, we find 18 photometrically identified subluminous SNe Ia, of which six have spectroscopic redshift (and three are spectroscopically confirmed SNe Ia). The evolution of the subluminous volumetric rate is constant or slightly decreasing with redshift, in contrast to the increasing SN Ia rate found for the normal stretch population, although a rising behavior is not conclusively ruled out. The subluminous sample is mainly found in early-type galaxies with little or no star formation, so that the rate evolution is consistent with a galactic mass-dependent behavior: r(z) = A x M{sub g} , with A = (1.1 {+-} 0.3) x 10{sup -14} SNe yr{sup -1} M{sup -1}{sub sun}.

• OSTI ID: 21567529
• Journal Information: Astrophysical Journal, Journal Name: Astrophysical Journal Journal Issue: 2 Vol. 727; ISSN ASJOAB; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
BINARY STARS
ERUPTIVE VARIABLE STARS
EVOLUTION
GALAXIES
RED SHIFT
STARS
SUPERNOVAE
VARIABLE STARS