Is the detonation burning in a degenerate carbon-oxygen core of a presupernova possible?

Details Is the detonation burning in a degenerate carbon-oxygen core of a presupernova possible? Is the detonation burning in a degenerate carbon-oxygen core of a presupernova possible?

Apr 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999astl...25..206i&link_type=abstract

Astronomy Letters, Volume 25, Issue 4, April 1999, pp.206-214

Astronomy and Astrophysics

Astronomy

11

Scientific paper

An attempt is made to solve the problem of the regime of burning in degenerate carbon-oxygen cores (CO cores) of stars, which are assumed to be type-Ia presupernovae, in favor of deflagration burning. For this purpose, we demonstrate numerically for Chapman-Jouguet detonation waves the galloping instability that changes into decay. The structure of these waves is described by the Zeldovich-Neumann model involving the kinetics of nuclear reactions in the burning zone. Along with the numerical hydrodynamic model, which include the kinetics of nuclear reactions, we suggest a qualitative model of galloping instability, which takes nonlinear perturbations into account. It is shown that the decay takes a very short time (less than 10 ms) and is nearly independent of th e initial disposition of detonation waves along the radius of the CO core. The kinetic equations include 12 nuclides, from C-12 to Si-28, with fairly detailed net of nuclear reactions (39 reactions). The initial composition of the CO core is an equimolar mixture of C-12 and O-16 (with equal mass fractions), while the mass of the CO core is close to the Chandrasekhar limit. In addition to with the mixture of Boltzmann nuclide gases, the equation of state takes into account the relativistic electron-positron gas of arbitrary degree of degeneracy and the equilibrium radiation.

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