Accretion in common envelope evolution

被引：92

作者：

Chamandy, Luke ^{[1
]}

Frank, Adam ^{[1
]}

Blackman, Eric G. ^{[1
]}

Carroll-Nellenback, Jonathan ^{[1
]}

Liu, Baowei ^{[1
]}

Tu, Yisheng ^{[1
]}

Nordhaus, Jason ^{[2
,3
]}

Chen, Zhuo ^{[1
]}

Peng, Bo ^{[1
]}

机构：

[1] Univ Rochester, Dept Phys & Astron, Rochester, NY 14618 USA

[2] Rochester Inst Technol, Natl Tech Inst Deaf, Rochester, NY 14623 USA

[3] Rochester Inst Technol, Ctr Computat Relat & Gravitat, Rochester, NY 14623 USA

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2018年 / 480卷 / 02期

基金：

美国国家科学基金会;

关键词：

accretion; accretion discs; hydrodynamics; methods: numerical; binaries: close; stars: kinematics and dynamics; PLANETARY-NEBULA; RECOMBINATION ENERGY; BINARY-SYSTEM; WHITE-DWARFS; STELLAR; STAR; MASS; SIMULATIONS; EJECTION; TRANSPORT;

D O I：

10.1093/mnras/sty1950

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Common envelope evolution (CEE) is presently a poorly understood, yet critical, process in binary stellar evolution. Characterizing the full 3D dynamics of CEE is difficult in part because simulating CEE is so computationally demanding. Numerical studies have yet to conclusively determine how the envelope ejects and a tight binary results, if only the binary potential energy is used to propel the envelope. Additional power sources might be necessary and accretion onto the inspiraling companion is one such source. Accretion is likely common in post-asymptotic giant branch binary interactions but how it operates and how its consequences depend on binary separation remain open questions. Here we use high-resolution global 3D hydrodynamic simulations of CEE with the adaptive mesh refinement code ASTROBEAR, to bracket the range of CEE companion accretion rates by comparing runs that remove mass and pressure via a subgrid accretion model with those that do not. The results show that if a pressure release valve is available, super-Eddington accretion may be common. Jets are a plausible release valve in these environments, and they could also help unbind and shape the envelopes.

引用

页码：1898 / 1911

页数：14

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