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We consider the finite velocity of the ejecta of a type Ia supernova (SN Ia)in the double detonation (DDet) scenario with a white dwarf (WD) mass-donorcompanion, and find that the runaway velocity of the surviving (mass donor) WDis lower than its pre-explosion orbital velocity by about 8-11%. This impliesthat the fastest runaway WDs in the Galaxy, if come from the DDet scenario,require even more massive WDs than what a simple calculation that neglects thefinite ejecta velocity gives. This extreme set of initial conditions makes suchbinaries less common. We also tentatively find that the inner ejecta deviatesfrom spherical symmetry, but not to the degree that we can use observations tomake any claim. Our findings support the claim that the DDet scenario leadsmostly to peculiar SNe Ia but not to normal SNe Ia.

The runaway velocity of the white dwarf companion in the double detonation scenario of supernovae