Abstract
The explosion of a helium layer accreted on top of a white dwarf, leading to the subsequent explosion of the star (while the accreting dwarf is still below the Chandrasekhar mass limit ) is an alternative model for some subluminous Type Ia supernova explosions. We present several calculations concerning these so-called sub-Chandrasekhar mass models for Type Ia supernovae, calculated in two dimensions. The usual assumption for this type of models is that the helium shell detonates first, leading to the off-center carbon detonation at the antipodes after a while. We explore the feasibility of a prompted detonation of the carbon lying just beneath the ignition point. To this end, we compare the initial carbon detonation mechanism for several models implying different white dwarf masses and initial helium ignition heights.
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