On the instability of deflagration fronts in white dwarfs

Eli Livne, W David Arnett

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

We discuss the stability of a deflagration front in white dwarfs in the context of burning mechanisms for Type Ia Supernovae. It is shown that the basic characteristics of the instability of the deflagration front are different frorn those of Rayleigh-Taylor instability, on which the deflagration models rely. In view of this, together with resuts from two-dimensional simulations, we argue that the deflagration model needs reconsideration, as Rayleigh-Taylor instability cannot explain the required high flame speed required for producing an explosion similar to Type Ia Supernovae. On the other hand, the same arguments imply that delayed detonations is acceptable and that the transition to detonation must occur in the very low density regime, where good agreement between observations and numerical results is obtained.

Original languageEnglish (US)
JournalAstrophysical Journal
Volume415
Issue number2 PART 2
StatePublished - Oct 1 1993

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deflagration
Taylor instability
detonation
supernovae
explosion
explosions
flames
simulation

Keywords

  • Supernovae: general
  • White dwarfs

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

On the instability of deflagration fronts in white dwarfs. / Livne, Eli; Arnett, W David.

In: Astrophysical Journal, Vol. 415, No. 2 PART 2, 01.10.1993.

Research output: Contribution to journalArticle

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AB - We discuss the stability of a deflagration front in white dwarfs in the context of burning mechanisms for Type Ia Supernovae. It is shown that the basic characteristics of the instability of the deflagration front are different frorn those of Rayleigh-Taylor instability, on which the deflagration models rely. In view of this, together with resuts from two-dimensional simulations, we argue that the deflagration model needs reconsideration, as Rayleigh-Taylor instability cannot explain the required high flame speed required for producing an explosion similar to Type Ia Supernovae. On the other hand, the same arguments imply that delayed detonations is acceptable and that the transition to detonation must occur in the very low density regime, where good agreement between observations and numerical results is obtained.

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