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Titolo:
THE DELAYED-DETONATION MODEL OF TYPE-IA SUPERNOVAE .2. THE DETONATIONPHASE
Autore:
ARNETT D; LIVNE E;
Indirizzi:
UNIV ARIZONA,STEWARD OBSERV TUCSON AZ 85724
Titolo Testata:
The Astrophysical journal
fascicolo: 1, volume: 427, anno: 1994,
parte:, 1
pagine: 330 - 341
SICI:
0004-637X(1994)427:1<330:TDMOTS>2.0.ZU;2-1
Fonte:
ISI
Lingua:
ENG
Soggetto:
WHITE-DWARFS; LIGHT-CURVE; EVOLUTION; SIMULATIONS; INSTABILITY; MECHANISMS; SN-1987A; NOVAE;
Keywords:
HYDRODYNAMICS; NUCLEAR REACTIONS, NUCLEOSYNTHESIS, ABUNDANCES; SUPERNOVAE, GENERAL;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
47
Recensione:
Indirizzi per estratti:
Citazione:
D. Arnett e E. Livne, "THE DELAYED-DETONATION MODEL OF TYPE-IA SUPERNOVAE .2. THE DETONATIONPHASE", The Astrophysical journal, 427(1), 1994, pp. 330-341

Abstract

The investigation, by use of two-dimensional numerical hydrodynamics simulations, of the ''delayed detonation'' mechanism of Khokhlov for the explosion of Type Ia supernovae is continued. Previously we found that 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 electron-capture problem. 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 mixingof high-entropy ashes with low-entropy fuel. During the first contraction phase, compressional heating reignites the material. The burning was allowed to develop into a detonation in these nonspherical models. The detonation grows toward spherical symmetry at late times. At these densities (rho approximately 10(7) to 10(8) g cm-3), either Ni-56 ornuclei of the Si-Ca group are the dominant products of the burning. The bulk yields are sensitive to the density of the star when the transition to detonation occurs. The relevance of the abundances, velocities, mixing, and total energy release to the theory and interpretation of Type la supernovae is discussed.

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Documento generato il 26/11/20 alle ore 09:02:01