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Nature 443, 283-284 (21 September 2006) | doi:10.1038/443283a; Published online 20 September 2006

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Astronomy: Champagne supernova

David Branch1

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Thermonuclear supernovae were thought to occur only when white-dwarf stars of a certain mass explode. The discovery of a supernova that is way over the mass limit might require a reworking of the model.

According to the conventional view, thermonuclear, or type Ia, supernova explosions occur when a white-dwarf star — a star that has exhausted its nuclear fuel and is composed entirely of carbon and oxygen — accretes matter from a close companion star. At the same time, the white dwarf contracts, and so its density and temperature increase.

  1. David Branch is in the Homer L. Dodge Department of Physics and Astronomy, University of Oklahoma, Norman, Oklahoma 73019, USA.
    Email: branch@nhn.ou.edu

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