Journal
ASTROPHYSICAL JOURNAL
Volume 827, Issue 1, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.3847/0004-637X/827/1/84
Keywords
convection; hydrodynamics; methods: numerical; nuclear reactions, nucleosynthesis, abundances; supernovae: general; white dwarfs
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Funding
- DOE/Office of Nuclear Physics grant [DE-FG02-87ER40317]
- Applied Mathematics Program of the DOE Office of Advance Scientific Computing Research under the U.S. Department of Energy [DE-AC02-05CH11231]
- Office of Science of the U.S. Department of Energy [DE-AC02-05CH11231, DE-AC05-00OR22725]
- National Science Foundation [OCI-1036199, OCI 07-25070]
- state of Illinois
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The dynamics of helium shell convection driven by nuclear burning establish the conditions for runaway in the sub-Chandrasekhar-mass, double-detonation model for SNe Ia, as well as for a variety of other explosive phenomena. We explore these convection dynamics for a range of white dwarf core and helium shell masses in three dimensions using the low Mach number hydrodynamics code MAESTRO. We present calculations of the bulk properties of this evolution, including time-series evolution of global diagnostics, lateral averages of the 3D state, and the global 3D state. We find a variety of outcomes, including quasi-equilibrium, localized runaway, and convective runaway. Our results suggest that the double-detonation progenitor model is promising and that 3D dynamic convection plays a key role.
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