Can Deflagration-Detonation-Transitions occur in Type Ia Supernovae?

Details Can Deflagration-Detonation-Transitions occur in Type Ia Supernovae? Can Deflagration-Detonation-Transitions occur in Type Ia Supernovae?

1999-06-08

arxiv.org/abs/astro-ph/9906142v2

Astronomy and Astrophysics

Astrophysics

8 pages, uses aastex; added references. Accepted by ApJ Letters

Scientific paper

10.1086/312253

The mechanism for deflagration-detonation-transition (DDT) by turbulent preconditioning, suggested to explain the possible occurrence of delayed detonations in Type Ia supernova explosions, is argued to be conceptually inconsistent. It relies crucially on diffusive heat losses of the burned material on macroscopic scales. Regardless of the amplitude of turbulent velocity fluctuations, the typical gradient scale for temperature fluctuations is shown to be the laminar flame width or smaller, rather than the factor of thousand more required for a DDT. Furthermore, thermonuclear flames cannot be fully quenched in regions much larger than the laminar flame width as a consequence of their simple ``chemistry''. Possible alternative explosion scenarios are briefly discussed.

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