Details

Autor(en) / Beteiligte

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

Titel

Low Mach Number Modeling of Type IA Supernovae. IV. White Dwarf Convection

Ist Teil von

• The Astrophysical journal, 2009-10, Vol.704 (1), p.196-210

Ort / Verlag

Bristol: IOP Publishing

Erscheinungsjahr

2009

Link zum Volltext

Quelle

Free E-Journal (出版社公開部分のみ）

Beschreibungen/Notizen

• 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.