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Most of the leading explosion scenarios for Type Ia supernovae involve thenuclear incineration of a white dwarf star through a detonation wave. Severalscenarios have been proposed as to how this detonation may actually occur, butthe exact mechanism and environment in which it takes place remain unknown. Weexplore the effects of an off-center initiated detonation on the spatialdistribution of the nucleosynthetic yield products in a toy model -- apre-expanded near Chandrasekhar-mass white dwarf. We find that a single-pointnear edge-lit detonation results in asymmetries in the density and thermalprofiles, notably the expansion timescale, throughout the supernova ejecta. Wedemonstrate that this asymmetry of the thermodynamic trajectories should becommon to off-center detonations where a small amount of the star is burnedprior to detonation. The sensitivity of the yields on the expansion timescaleresults in an asymmetric distribution of the elements synthesized as reactionproducts. We tabulate the shift in the center of mass of the various elementsproduced in our model supernova and find an odd-even pattern for elements pastsilicon. Our calculations show that off-center single-point detonations incarbon-oxygen white dwarfs are marked by significant composition asymmetries intheir remnants which bear potentially observable signatures in both velocityand coordinate space, including an elemental nickel mass fraction which variesby a factor of two to three from one side of the remnant to the other.

Asymmetry and the Nucleosynthetic Signature of Nearly Edge-Lit Detonation in White Dwarf Cores