Thermonuclear Supernovae: Is Deflagration Triggered by Floating Bubbles?

Abstract.

In recent years, it has become clear from multidimensional simulations that the outcome of deflagrations depends strongly on the initial configuration of the flame. We have studied under which conditions this configuration could consist of a number of scattered, isolated, hot bubbles. Afterwards, we have calculated the evolution of deflagrations starting from different numbers of bubbles. We have found that starting from 30 bubbles a mild explosion is produced ( $M (^{56}{\mathrm Ni}) = 0.56 {\mathrm M}_\odot$), while starting from 10 bubbles the star becomes only marginally unbound (K = 0.05 foes).