183 research outputs found
The runaway velocity of the white dwarf companion in the double detonation scenario of supernovae
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-donor
companion, and find that the runaway velocity of the surviving (mass donor) WD
is lower than its pre-explosion orbital velocity by about 8-11 %. This implies
that 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 the
finite ejecta velocity gives. This extreme set of initial conditions makes such
binaries less common. We also tentatively find that the inner ejecta largely
deviate from spherical symmetry, unlike observed SN Ia remnants. We argue that
these findings support the claim that the DDet scenario leads mostly to
peculiar SNe Ia but not to normal SNe Ia.Comment: Will be submitted in two days to allow for comment
Acyanotic fallot's tetralogy: a clinical report of six cases
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Le procès de Novosibirsk, d'après la Pravda
Braudo Michel. Le procès de Novosibirsk, d'après la Pravda. In: Matériaux pour l'histoire de notre temps, n°7-8, 1986. L'année 1936 dans le monde, sous la direction de Stéphane Courtois. pp. 44-46
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