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 · 21 September 2009 · The Astrophysical Journal

DOI: https://doi.org/10.1088/0004-637x/704/1/196 · OSTI ID:1564699

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

Stony Brook Univ., NY (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Univ. of California, Santa Cruz, CA (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. To conclude, we evolve several calculations to the point of ignition and discuss the range of ignition radii.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF); Univ. of California, Oakland, CA (United States); Argonne National Lab. (ANL), Argonne, IL (United States); UT-Battelle LLC/ORNL, Oak Ridge, TN (United States); Univ. of California, Santa Cruz, CA (United States); State Univ. of New York (SUNY), Albany, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC02-05CH11231; AC02-06CH11357; AC05-00OR22725; FC02-06ER41438; FG02-06ER41448

OSTI ID:: 1564699

Journal Information:: The Astrophysical Journal, Journal Name: The Astrophysical Journal Journal Issue: 1 Vol. 704; ISSN 0004-637X

Publisher:: Institute of Physics (IOP)Copyright Statement

Country of Publication:: United States

Language:: English

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