Active carbon and oxygen shell burning hydrodynamics

Casey A. Meakin, David Arnett

Research output: Contribution to journalArticle

72 Scopus citations

Abstract

We have simulated 2.5 × 103 s of the late evolution of a 23 M star with full hydrodynamic behavior. We present the first simulations of a multiple-shell burning epoch, including the concurrent evolution and interaction of an oxygen- and a carbon-burning shell. In addition, we have evolved a three-dimensional model of the oxygen-burning shell to sufficiently long times (300 s) to begin to assess the adequacy of the two-dimensional approximation. We summarize striking new results: (1) strong interactions occur between active carbon- and oxygen-burning shells; (2) hydrodynamic wave motions in nonconvective regions, generated at the convective-radiative boundaries, are energetically important in both two and three dimensions, with important consequences for compositional mixing; and (3) a spectrum of mixed p- and g-modes are unambiguously identified with corresponding adiabatic waves in these computational domains. We find that two-dimensional convective motions are exaggerated relative to three-dimensional ones because of vortex instability in three dimensions. We discuss the implications for supernova progenitor evolution and symmetry breaking in core collapse.

Original languageEnglish (US)
Pages (from-to)L53-L56
JournalAstrophysical Journal
Volume637
Issue number1 II
DOIs
StatePublished - Jan 20 2006

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Keywords

  • Hydrodynamics
  • Stars: interiors - Turbulence
  • Waves

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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