EVOLUTION IN THE VOLUMETRIC TYPE Ia SUPERNOVA RATE FROM THE SUPERNOVA LEGACY SURVEY
- Department of Astronomy and Astrophysics, University of Toronto, 50 St. George Street, Toronto, ON, M5S 3H4 (Canada)
- Department of Physics (Astrophysics), University of Oxford, DWB, Keble Road, Oxford OX1 3RH (United Kingdom)
- Center for Astrophysics and Space Astronomy, University of Colorado, 593 UCB, Boulder, CO 80309-0593 (United States)
- CPPM, CNRS-IN2P3 and University Aix Marseille II, Case 907, 13288 Marseille cedex 9 (France)
- Lawrence Berkeley National Laboratory, Mail Stop 50-232, 1 Cyclotron Road, Berkeley, CA 94720 (United States)
- Cahill Center for Astronomy and Astrophysics, California Institute of Technology, 1200 East California Blvd., Pasadena, CA 91125 (United States)
- LPNHE, Universite Pierre et Marie Curie Paris 6, Universite Paris Diderot Paris 7, CNRS-IN2P3, 4 place Jussieu, 75005 Paris (France)
- Dominion Astrophysical Observatory, Herzberg Institute of Astrophysics, 5071 West Saanich Road, Victoria, BC, V9E 2E7 (Canada)
- Laboratoire d'Astrophysique de Marseille, Pole de l'Etoile Site de Chateau-Gombert, 38, rue Frederic Joliot-Curie, 13388 Marseille cedex 13 (France)
- Las Cumbres Observatory Global Telescope Network, 6740 Cortona Dr., Suite 102, Goleta, CA 93117 (United States)
- DSM/IRFU/SPP, CEA-Saclay, F-91191 Gif-sur-Yvette (France)
- Department of Physics and Astronomy, University of Victoria, P.O. Box 3055, Stn CSC, Victoria, BC, V8W 3P6 (Canada)
We present a measurement of the volumetric Type Ia supernova (SN Ia) rate (SNR{sub Ia}) as a function of redshift for the first four years of data from the Canada-France-Hawaii Telescope Supernova Legacy Survey (SNLS). This analysis includes 286 spectroscopically confirmed and more than 400 additional photometrically identified SNe Ia within the redshift range 0.1 {<=} z {<=} 1.1. The volumetric SNR{sub Ia} evolution is consistent with a rise to z {approx} 1.0 that follows a power law of the form (1+z){sup {alpha}}, with {alpha} = 2.11 {+-} 0.28. This evolutionary trend in the SNLS rates is slightly shallower than that of the cosmic star formation history (SFH) over the same redshift range. We combine the SNLS rate measurements with those from other surveys that complement the SNLS redshift range, and fit various simple SN Ia delay-time distribution (DTD) models to the combined data. A simple power-law model for the DTD (i.e., {proportional_to}t{sup -{beta}}) yields values from {beta} = 0.98 {+-} 0.05 to {beta} = 1.15 {+-} 0.08 depending on the parameterization of the cosmic SFH. A two-component model, where SNR{sub Ia} is dependent on stellar mass (M{sub stellar}) and star formation rate (SFR) as SNR{sub Ia}(z) = A Multiplication-Sign M{sub stellar}(z) + B Multiplication-Sign SFR(z), yields the coefficients A = (1.9 {+-} 0.1) Multiplication-Sign 10{sup -14} SNe yr{sup -1} M{sup -1}{sub Sun} and B = (3.3 {+-} 0.2) Multiplication-Sign 10{sup -4} SNe yr{sup -1} (M{sub Sun} yr{sup -1}){sup -1}. More general two-component models also fit the data well, but single Gaussian or exponential DTDs provide significantly poorer matches. Finally, we split the SNLS sample into two populations by the light-curve width (stretch), and show that the general behavior in the rates of faster-declining SNe Ia (0.8 {<=} s < 1.0) is similar, within our measurement errors, to that of the slower objects (1.0 {<=} s < 1.3) out to z {approx} 0.8.
- OSTI ID:
- 22034382
- Journal Information:
- Astronomical Journal (New York, N.Y. Online), Vol. 144, Issue 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 1538-3881
- Country of Publication:
- United States
- Language:
- English
Similar Records
Rates and delay times of type Ia supernovae in the Dark Energy Survey
THE HUBBLE SPACE TELESCOPE CLUSTER SUPERNOVA SURVEY. II. THE TYPE Ia SUPERNOVA RATE IN HIGH-REDSHIFT GALAXY CLUSTERS