LOW MACH NUMBER MODELING OF CONVECTION IN HELIUM SHELLS ON SUB-CHANDRASEKHAR WHITE DWARFS. II. BULK PROPERTIES OF SIMPLE MODELS

被引：16

作者：

Jacobs, A. M. ^{[1
]}

Zingale, M. ^{[1
]}

Nonaka, A. ^{[2
]}

Almgren, A. S. ^{[2
]}

Bell, J. B. ^{[2
]}

机构：

[1] SUNY Stony Brook, Dept Phys & Astron, Stony Brook, NY 11794 USA

[2] Lawrence Berkeley Natl Lab, Ctr Computat Sci & Engn, Berkeley, CA 94720 USA

来源：

ASTROPHYSICAL JOURNAL | 2016年 / 827卷 / 01期

基金：

美国国家科学基金会;

关键词：

convection; hydrodynamics; methods: numerical; nuclear reactions; nucleosynthesis; abundances; supernovae: general; white dwarfs; THERMONUCLEAR REACTION-RATES; STELLAR ASTROPHYSICS MESA; PRE-SUPERNOVA EVOLUTION; OFF-CENTER DETONATION; AM CVN STARS; IA SUPERNOVAE; MASS MODELS; LAX SUPERNOVAE; EXPLOSIONS; HYDRODYNAMICS;

D O I：

10.3847/0004-637X/827/1/84

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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.

引用

页数：18