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The delayed-detonation model of a type Ia supernovae. 1: The deflagration phaseThe nature of the 'delayed detonation' mechanism of Khokhlov for the explosion of Type Ia supernovae is investigated by using two-dimensional numerical hydrodynamics simulations. A new algorithm is used to treat the deflagration front. Assuming that it propagates locally at the laminar flame speed, the deflagration is insufficient to unbind the star. Expansion shuts of the flame; much of this small production of iron group nuclei occurs at lower densities, which reduces the electron-capture problem. The burning front does become wrinkled, but the wavelength of the instability is much larger than the computational grid size and is resolved; this is consistent with previous analysis. Because the degenerate star has an adiabatic exponent only slightly above 4/3, the energy released by deflagration drives a pulsation of large amplitude. During the first expansion phase, adiabatic cooling shuts off the burning, and a Rayleigh-Taylor instability then gives mixing of high-entropy ashes with low-entropy fuel. During the first contraction phase, compressional heating reignites the material. This paper deals with the deflagration phase, from the onset of burning, through expansion and quenching of the flame, to the first contraction.
Document ID
19950034144
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Arnett, David
(Univ. of Arizona, Tucson, AZ United States)
Livne, Eli
(Univ. of Arizona, Tucson, AZ United States)
Date Acquired
August 16, 2013
Publication Date
May 20, 1994
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 427
Issue: 1
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
95A65743
Funding Number(s)
CONTRACT_GRANT: NAGW-2450
CONTRACT_GRANT: NSF ASTRO-90-15976
Distribution Limits
Public
Copyright
Other

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