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The Astrophysical Journal Volume 681 Number 2 Create an alert RSS this journal

G. C. Jordan IV et al. 2008 ApJ 681 1448 doi:10.1086/588269

Three-Dimensional Simulations of the Deflagration Phase of the Gravitationally Confined Detonation Model of Type Ia Supernovae

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G. C. Jordan IV1,2, R. T. Fisher1,2, D. M. Townsley2,3, A. C. Calder1,2,4, C. Graziani1,2, S. Asida5, D. Q. Lamb1,2,6, and J. W. Truran1,2,6,7

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Abstract References Cited By
We report the results of a series of three-dimensional (3D) simulations of the deflagration phase of the gravitationally confined detonation mechanism for Type Ia supernovae. In this mechanism, ignition occurs at one or several off-center points, resulting in a burning bubble of hot ash that rises rapidly, breaks through the surface of the star, and collides at a point opposite the breakout on the stellar surface. We find that detonation conditions are robustly reached in our 3D simulations for a range of initial conditions and resolutions. Detonation conditions are achieved as the result of an inwardly directed jet that is produced by the compression of unburnt surface material when the surface flow collides with itself. A high-velocity outwardly directed jet is also produced. The initial conditions explored in this paper lead to conditions at detonation that can be expected to produce large amounts of 56Ni and small amounts of intermediate-mass elements. These particular simulations are therefore relevant only to high-luminosity Type Ia supernovae. Recent observations of Type Ia supernovae imply a compositional structure that is qualitatively consistent with that expected from these simulations.

Subject headings

hydrodynamics; nuclear reactions, nucleosynthesis, abundances; supernovae: general; white dwarfs


Dates

Issue 2 (2008 July 10)

Received 2007 March 22, accepted for publication 2008 March 11



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