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Presentation #317.04 in the session Type Ia and Iax Supernovae.
The discovery of three hypervelocity white dwarfs (WDs) in the the Gaia DR2 catalog provided observational evidence of the ex-companions of sub-Chandrasekhar (sub-MCh) WDs which underwent type Ia supernovae (SNe Ia) explosions in a variant of the double-degenerate scenario. In this talk, I will present recent 3D hydrodynamical simulations of this dynamically driven double-degenerate double-detonation (D6) channel, a promising SN Ia explosion mechanism which accounts for the Gaia DR2 hypervelocity WDs. I will discuss the hydrodynamical evolution and nucleosynthetic yields of these simulations, and consider their relevance for the broader SN Ia progenitor problem.