LOW MACH NUMBER MODELING OF TYPE IA SUPERNOVAE. IV. WHITE DWARF CONVECTION

Zingale, M; Almgren, A S; Bell, J B; Nonaka, A; Woosley, S E

doi:10.1088/0004-637X/704/1/196

Title: LOW MACH NUMBER MODELING OF TYPE IA SUPERNOVAE. IV. WHITE DWARF CONVECTION

Journal Article · Sat Oct 10 00:00:00 EDT 2009 · Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/704/1/196· OSTI ID:21367468

Zingale, M ^[1]; Almgren, A S; Bell, J B; Nonaka, A ^[2]; Woosley, S E ^[3]

Department of Physics and Astronomy, Stony Brook University, Stony Brook, NY 11794-3800 (United States)
Center for Computational Sciences and Engineering, Lawrence Berkeley National Laboratory, Berkeley, CA 94720 (United States)
Department of Astronomy and Astrophysics, University of California, Santa Cruz, Santa Cruz, CA 95064 (United States)

We present the first three-dimensional, full-star simulations of convection in a white dwarf preceding a Type Ia supernova, specifically the last few hours before ignition. For these long-time calculations, we use our low Mach number hydrodynamics code, MAESTRO, which we have further developed to treat spherical stars centered in a three-dimensional Cartesian geometry. The main change required is a procedure to map the one-dimensional radial base state to and from the Cartesian grid. Our models recover the dipole structure of the flow seen in previous calculations, but our long-time integration shows that the orientation of the dipole changes with time. Furthermore, we show the development of gravity waves in the outer, stable portion of the star. Finally, we evolve several calculations to the point of ignition and discuss the range of ignition radii.

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OSTI ID:: 21367468

Journal Information:: Astrophysical Journal, Vol. 704, Issue 1; Other Information: DOI: 10.1088/0004-637X/704/1/196; ISSN 0004-637X

Country of Publication:: United States

Language:: English

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79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
ABUNDANCE
CONVECTION
DIPOLES
GRAVITY WAVES
HYDRODYNAMICS
IGNITION
MACH NUMBER
MAPS
NUCLEAR REACTIONS
NUCLEOSYNTHESIS
ONE-DIMENSIONAL CALCULATIONS
SIMULATION
SUPERNOVAE
THREE-DIMENSIONAL CALCULATIONS
WHITE DWARF STARS
BINARY STARS
DIMENSIONLESS NUMBERS
DWARF STARS
ENERGY TRANSFER
ERUPTIVE VARIABLE STARS
FLUID MECHANICS
HEAT TRANSFER
MASS TRANSFER
MECHANICS
MULTIPOLES
STARS
SYNTHESIS
VARIABLE STARS
VELOCITY

Title: LOW MACH NUMBER MODELING OF TYPE IA SUPERNOVAE. IV. WHITE DWARF CONVECTION

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