The explosion models and progenitors of type Ia supernovae

Details The explosion models and progenitors of type Ia supernovae The explosion models and progenitors of type Ia supernovae

Mar 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003pabei..21...55w&link_type=abstract

Progress in Astronomy (ISSN 1000-8349), Vol. 21, No. 1, p. 55 - 69 (2003)

Astronomy and Astrophysics

Astrophysics

Astrophysics, Models Of Supernovae, White Dwarfs, Hydrodynamics

Scientific paper

Type Ia Supernovae (SNe Ia) are more significant as standard candles in the extragalactic distance measurement - and hence in the determination of the expansion rate of the universe. SNe Ia are enigmatic objects in many aspects, and their progenitors and explosion mechanisms have not been understood well. At present the observations are not strong enough to provide precise constraints on the theoretical models, but we believe that most SNe Ia are formed by the explosion due to the thermonuclear fusion of carbon and oxygen in white dwarfs that have mass close to the Chandrasekhar mass (≍1.39 Msolar). The mechanism, which is used to explain the explosion, especially how the hydrodynamical process occurs, is still an open question. However, recent results from three-dimensional numerical simulations of thermonuclear deflagration would show that it was not necessary to include the detonation in the late phase of the burning. On the other hand, although the progenitor model of a white dwarf with a main sequence (or red giant) companion seems to be more reasonable, the model of merge of two white dwarfs cannot be ruled out as the latter might account for some preculiar SNe Ia.

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