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Accretion in common envelope evolution

Published online by Cambridge University Press:  30 December 2019

Luke Chamandy ,
Adam Frank ,
Eric G. Blackman ,
Jonathan Carroll-Nellenback ,
Baowei Liu ,
Yisheng Tu ,
Jason Nordhaus ,
Zhuo Chen  and
Bo Peng Open the ORCID record for Bo Peng [Opens in a new window]
Luke Chamandy
Affiliation:
Department of Physics and Astronomy, University of Rochester, Rochester NY 14618, USA emails: [email protected], [email protected], [email protected]
Adam Frank
Affiliation:
Department of Physics and Astronomy, University of Rochester, Rochester NY 14618, USA emails: [email protected], [email protected], [email protected]
Eric G. Blackman
Affiliation:
Department of Physics and Astronomy, University of Rochester, Rochester NY 14618, USA emails: [email protected], [email protected], [email protected]
Jonathan Carroll-Nellenback
Affiliation:
Department of Physics and Astronomy, University of Rochester, Rochester NY 14618, USA emails: [email protected], [email protected], [email protected]
Baowei Liu
Affiliation:
Department of Physics and Astronomy, University of Rochester, Rochester NY 14618, USA emails: [email protected], [email protected], [email protected]
Yisheng Tu
Affiliation:
Department of Physics and Astronomy, University of Rochester, Rochester NY 14618, USA emails: [email protected], [email protected], [email protected]
Jason Nordhaus
Affiliation:
National Technical Institute for the Deaf, Rochester Institute of Technology, NY 14623, USA Center for Computational Relativity and Gravitation, Rochester Institute of Technology, NY 14623, USA
Zhuo Chen
Affiliation:
Department of Physics and Astronomy, University of Rochester, Rochester NY 14618, USA emails: [email protected], [email protected], [email protected]
Bo Peng
Affiliation:
Department of Physics and Astronomy, University of Rochester, Rochester NY 14618, USA emails: [email protected], [email protected], [email protected]
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Abstract

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Common envelope evolution (CEE) occurs in some binary systems involving asymptotic giant branch (AGB) or red giant branch (RGB) stars, and understanding this process is crucial for understanding the origins of various transient phenomena. CEE has been shown to be highly asymmetrical and global 3D simulations are needed to help understand the dynamics. We perform and analyze hydrodynamic CEE simulations with the adaptive mesh refinement (AMR) code AstroBEAR, and focus on the role of accretion onto the companion star. We bracket the range of accretion rates by comparing a model that removes mass and pressure using a subgrid accretion prescription with one that does not. Provided a pressure-release valve, such as a bipolar jet, is available, super-Eddington accretion could be common. Finally, we summarize new results pertaining to the energy budget, and discuss the overall implications relating to the feasibility of unbinding the envelope in CEE simulations.

Keywords

Binaries: closeaccretionaccretion discsstars: kinematicshydrodynamicsmethods: numerical
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 14 , Symposium S343: Why Galaxies Care About AGB Stars: A Continuing Challenge through Cosmic Time , August 2018 , pp. 235 - 238
Copyright
© International Astronomical Union 2019 

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