The ignition of thermonuclear flames in Type Ia supernovae

Details The ignition of thermonuclear flames in Type Ia supernovae The ignition of thermonuclear flames in Type Ia supernovae

2005-12-12

arxiv.org/abs/astro-ph/0512300v1

Astron.Astrophys.450:655-666,2006

Astronomy and Astrophysics

Astrophysics

12 pages, 11 figures, submitted to A&A

Scientific paper

10.1051/0004-6361:20054052

In the framework of the Chandrasekhar-mass deflagration model for Type Ia supernovae (SNe Ia), a persisting free parameter is the initial morphology of the flame front, which is linked to the ignition process in the progenitor white dwarf. Previous analytical models indicate that the thermal runaway is driven by temperature perturbations (''bubbles'') that develop in the white dwarf's convective core. In order to probe the conditions at ignition (diameters, temperatures and evolutionary timescales), we have performed hydrodynamical 2D simulations of buoyant bubbles in white dwarf interiors. Our results show that fragmentation occurring during the bubble rise affects the outcome of the bubble evolution. Possible implications for the ignition process of SNe Ia are discussed.

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