Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aas...21116208g&link_type=abstract
American Astronomical Society, AAS Meeting #211, #162.08
Astronomy and Astrophysics
Astronomy
Scientific paper
We consider possible mechanisms for detonation initiation in an exploding carbon-oxygen white dwarf. According to current models of Type Ia supernovae, the explosion starts as a thermonuclear deflagration, but ends as a detonation. The process of deflagration-to-detonation transition (DDT) is still not well understood, though there are several scenarios that may lead to the detonation initiation. These include mixing between burned and unburned materials, shock-flame interactions, and large-scale pulsations. Theory and simulations of DDT phenomena in terrestrial chemical systems show that DDT often involves formation of reactivity gradients that help to generate strong shocks. The same gradient mechanism may be responsible for the detonation initiation in Type Ia Supernovae, in particular, in the mixing scenario. Detonations can also be ignited when shocks interacting with thermonuclear flames accelerate, or strong shocks allow a direct detonation initiation. We analyze length scales associated with different mechanisms.
This work was supported in part by the NASA ATP program (NRA NNH05ZDA001N-AT) and by the Naval Research Laboratory (NRL) through the Office of Naval Research.
Gamezo Vadim N.
Oran Elaine S.
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