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The nucleosynthetic characteristics of various explosion mechanisms of TypeIa supernovae (SNe Ia) is explored based on three two-dimensional explosionsimulations representing extreme cases: a pure turbulent deflagration, adelayed detonation following an approximately spherical ignition of the initialdeflagration, and a delayed detonation arising from a highly asymmetricdeflagration ignition. Apart from this initial condition, the deflagrationstage is treated in a parameter-free approach. The detonation is initiated whenthe turbulent burning enters the distributed burning regime. This occurs atdensities around $10^{7}$ g cm$^{-3}$ -- relatively low as compared to existingnucleosynthesis studies for one-dimensional spherically symmetric models. Theburning in these multidimensional models is different from that inone-dimensional simulations as the detonation wave propagates both intounburned material in the high density region near the center of a white dwarfand into the low density region near the surface. Thus, the resulting yield isa mixture of different explosive burning products, from carbon-burning productsat low densities to complete silicon-burning products at the highest densities,as well as electron-capture products synthesized at the deflagration stage. Incontrast to the deflagration model, the delayed detonations produce acharacteristic layered structure and the yields largely satisfy constraintsfrom Galactic chemical evolution. In the asymmetric delayed detonation model,the region filled with electron capture species (e.g., $^{58}$Ni, $^{54}$Fe) iswithin a shell, showing a large off-set, above the bulk of $^{56}$Nidistribution, while species produced by the detonation are distributed morespherically (abridged).

Nucleosynthesis in Two-Dimensional Delayed Detonation Models of Type Ia Supernova Explosions