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Titolo: THE DELAYEDDETONATION MODEL OF A TYPEIA SUPERNOVAE .1. THE DEFLAGRATION PHASE
Autore: ARNETT D; LIVNE E;
 Indirizzi:
 UNIV ARIZONA,STEWARD OBSERV TUCSON AZ 85721
 Titolo Testata:
 The Astrophysical journal
fascicolo: 1,
volume: 427,
anno: 1994,
parte:, 1
pagine: 315  329
 SICI:
 0004637X(1994)427:1<315:TDMOAT>2.0.ZU;2I
 Fonte:
 ISI
 Lingua:
 ENG
 Soggetto:
 WHITEDWARFS; SIMULATIONS; INSTABILITY; EVOLUTION; SN1987A;
 Keywords:
 HYDRODYNAMICS; NUCLEAR REACTIONS, NUCLEOSYNTHESIS, ABUNDANCES; SUPERNOVAE, GENERAL;
 Tipo documento:
 Article
 Natura:
 Periodico
 Settore Disciplinare:
 Science Citation Index Expanded
 Citazioni:
 31
 Recensione:
 Indirizzi per estratti:



 Citazione:
 D. Arnett e E. Livne, "THE DELAYEDDETONATION MODEL OF A TYPEIA SUPERNOVAE .1. THE DEFLAGRATION PHASE", The Astrophysical journal, 427(1), 1994, pp. 315329
Abstract
The nature of the ''delayed detonation'' mechanism of Khokhlov for the explosion of Type Ia supernovae is investigated by using twodimensional 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 off the flame; much of this small production of iron group nuclei occurs at lower densities, which reduces the electroncapture 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 offthe burning, and a RayleighTaylor instability then gives mixing of highentropy ashes with lowentropy 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.
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Documento generato il 26/11/20 alle ore 08:57:57