Deflagration to Detonation

Details Deflagration to Detonation Deflagration to Detonation

1999-10-25

arxiv.org/abs/astro-ph/9910454v1

Astronomy and Astrophysics

Astrophysics

11 pages, TeX, epsf.sty, 4 figures(1color), to be published in: Supernovae and Gamma-Ray Bursts, eds. M.Livio, K.Sahu, N.Panag

Scientific paper

Thermonuclear explosions of Type Ia supernovae (SNIa) involve turbulent deflagrations, detonations, and possibly a deflagration-to-detonation transition. A phenomenological delayed detonation model of SNIa successfully explains many observational properties of SNIa including monochromatic light curves, spectra, brightness - decline and color - decline relations. Observed variations among SNia are explained as a result of varying nickel mass synthesised in an explosion of a Chandrasekhar mass C/O white dwarf. Based on theoretical models of SNIa, the value of the Hubble constant H_o \simeq 67km/s/Mpc was determined without the use of secondary distance indicators. The cause for the nickel mass variations in SNIa is still debated. It may be a variation of the initial C/O ratio in a supernova progenitor, rotation, or other effects.

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