Mechanisms for the initiation of detonations in the degenerate matter of supernovae

Details Mechanisms for the initiation of detonations in the degenerate matter of supernovae Mechanisms for the initiation of detonations in the degenerate matter of supernovae

Jun 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...246..383k&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 246, no. 2, June 1991, p. 383-396.

Astronomy and Astrophysics

Astrophysics

32

Detonation, Hydrodynamics, Supernova Remnants, Supernovae, Thermonuclear Explosions, White Dwarf Stars, Carbon Stars, Deflagration, Flame Propagation, Oxygen, Shock Waves, Steady State, Thermal Conductivity

Scientific paper

The mechanisms and critical conditions for the initiation of thermonuclear detonations in C-O stars are investigated using a statistical approach which takes into account small scale fluctuations of induction time (a time for the local development of the thermonuclear runaway) and describes the feedback between mean hydrodynamical flow and burning. Results suggest that both processes, the direct initiation and the transition from deflagration to detonation, can take place at certain conditions. The direct initiation of a detonation at the center of dense C-O white dwarfs was ruled out by the fact that spectra of Type Ia supernovae show presence of intermediate mass elements. Using this fact, a lower bound is derived for the amplitude of the spatial spectrum of temperature fluctuations inside the interior of massive degenerate Type Ia progenitors before explosion. The possibility of a 'delayed detonation' mode of SNIa explosions is discussed.

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