Conley, A. and Howell, D. A. and Howes, A. and Sullivan, M. and Astier, P. and Balam, D. and Basa, S. and Carlberg, R. G. and Fouchez, D. and Guy, J. and Hook, I. and Neill, J. D. and Pain, R. and Perrett, K. and Pritchet, C. J. and Regnault, N. and Rich, J. and Taillet, R. and Aubourg, E. and Bronder, J. and Ellis, R. S. and Fabbro, S. and Filiol, M. and Le Borgne, D. and Palanque-Delabrouille, N. and Perlmutter, S. and Ripoche, P. (2006) The Rise Time of Type Ia Supernovae from the Supernova Legacy Survey. Astronomical Journal, 132 (4). pp. 1707-1713. ISSN 0004-6256 http://resolver.caltech.edu/CaltechAUTHORS:20110224-082839144
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We compare the rise times of nearby and distant Type Ia supernovae (SNe Ia) as a test for evolution using 73 high-redshift spectroscopically confirmed SNe Ia from the first 2 years of the 5 year Supernova Legacy Survey (SNLS) and published observations of nearby SNe. Because of the "rolling" search nature of the SNLS, our measurement is approximately 6 times more precise than previous studies, allowing for a more sensitive test of evolution between nearby and distant SNe. Adopting a simple t(2) early-time model (as in previous studies), we find that the rest-frame B rise times for a fiducial SN Ia at high and low redshift are consistent, with values 19.10_(-0.17)^(+0.18) (stat) ± 0.2(syst) and 19.58_(-0.19)^(+0.22) days, respectively; the statistical significance of this difference is only 1.4 σ. The errors represent the uncertainty in the mean rather than any variation between individual SNe. We also compare subsets of our high-redshift data set based on decline rate, host galaxy star formation rate, and redshift, finding no substantive evidence for any subsample dependence.
|Additional Information:||© 2006 The American Astronomical Society. Received 2006 March 28; accepted 2006 July 16. Based on observations obtained with MegaPrime/MegaCam, a joint project of the Canada-France-Hawaii Telescope (CFHT) and CEA/DAPNIA, at CFHT, which is operated by the National Research Council (NRC) of Canada, the Institut National des Sciences de l’Univers of the Centre National de la Recherche Scientifique (CNRS) of France, and the University of Hawaii. This work is based in part on data products produced at the Canadian Astronomy Data Centre as part of the CFHT Legacy Survey, a collaborative project of NRC and CNRS. The authors would like to recognize the very significant cultural role and reverence that the summit of Mauna Kea has within the indigenous community of Hawai’i. We are grateful for our opportunity to conduct observations from this mountain. We would also like to thank Peter Nugent and Peter Höflich for useful discussions. We gratefully acknowledge the assistance of Pierre Martin and the CFHT Queued Service Observations team. Jean-Charles Cuillandre and Kanoa Washington were particularly indispensable in making possible real-time data reduction at CFHT. Canadian collaboration members acknowledge support from NSERC and CIAR; French members from CNRS/IN2P3, CNRS/INSU, and CEA. This research has made use of the NASA/IPAC Extragalactic Database, which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration. The views expressed in this article are those of the authors and do not reflect the official position of the United States Air Force, Department of Defense, or US Government.|
|Subject Keywords:||cosmology : observations; supernovae : general|
|Official Citation:||A. Conley et al. 2006 The Astronomical Journal 132 1707 doi: 10.1086/507788|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Ruth Sustaita|
|Deposited On:||24 Feb 2011 22:16|
|Last Modified:||26 Dec 2012 12:57|
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