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The type Ia supernova SNLS-03D3bb from a super-Chandrasekhar-mass white dwarf star.
MedLine Citation:
PMID:  16988705     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Abstract/OtherAbstract:
The accelerating expansion of the Universe, and the need for dark energy, were inferred from observations of type Ia supernovae. There is a consensus that type Ia supernovae are thermonuclear explosions that destroy carbon-oxygen white dwarf stars that have accreted matter from a companion star, although the nature of this companion remains uncertain. These supernovae are thought to be reliable distance indicators because they have a standard amount of fuel and a uniform trigger: they are predicted to explode when the mass of the white dwarf nears the Chandrasekhar mass of 1.4 solar masses (M(o)). Here we show that the high-redshift supernova SNLS-03D3bb has an exceptionally high luminosity and low kinetic energy that both imply a super-Chandrasekhar-mass progenitor. Super-Chandrasekhar-mass supernovae should occur preferentially in a young stellar population, so this may provide an explanation for the observed trend that overluminous type Ia supernovae occur only in 'young' environments. As this supernova does not obey the relations that allow type Ia supernovae to be calibrated as standard candles, and as no counterparts have been found at low redshift, future cosmology studies will have to consider possible contamination from such events.
Authors:
D Andrew Howell; Mark Sullivan; Peter E Nugent; Richard S Ellis; Alexander J Conley; Damien Le Borgne; Raymond G Carlberg; Julien Guy; David Balam; Stephane Basa; Dominique Fouchez; Isobel M Hook; Eric Y Hsiao; James D Neill; Reynald Pain; Kathryn M Perrett; Christopher J Pritchet
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Nature     Volume:  443     ISSN:  1476-4687     ISO Abbreviation:  Nature     Publication Date:  2006 Sep 
Date Detail:
Created Date:  2006-09-21     Completed Date:  2006-10-17     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0410462     Medline TA:  Nature     Country:  England    
Other Details:
Languages:  eng     Pagination:  308-11     Citation Subset:  -    
Affiliation:
Department of Astronomy and Astrophysics, University of Toronto, 60 St George Street, Toronto, Ontario M5S 3H8, Canada. howell@astro.utoronto.ca
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Comment In:
Nature. 2006 Sep 21;443(7109):283-4   [PMID:  16988699 ]

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