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Post-AGB discs from common-envelope evolution

Izzard, Robert G and Jermyn, Adam S (2018) Post-AGB discs from common-envelope evolution Galaxies, 6 (3), 97.

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Post-asymptotic giant branch (post-AGB) stars with discs are all binaries. Many of these binaries have orbital periods between 100 and 1000 days so cannot have avoided mass transfer between the AGB star and its companion, likely through a common-envelope type interaction. We report on preliminary results of our project to model circumbinary discs around post-AGB stars using our binary population synthesis code binary_c. We combine a simple analytic thin-disc model with binary stellar evolution to estimate the impact of the disc on the binary, and vice versa, fast enough that we can model stellar population and hence explore the rather uncertain parameter space involved with disc formation. We find that, provided the discs form with sufficient mass and angular momentum, and have an inner edge that is relatively close to the binary, they can both prolong the life of their parent post-AGB star and pump the eccentricity of orbits of their inner binaries.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
Izzard, Robert
Jermyn, Adam S
Date : 11 September 2018
DOI : 10.3390/galaxies6030097
Copyright Disclaimer : Copyright 2018 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (
Uncontrolled Keywords : binary stars; post-AGB; discs
Depositing User : Users 8 not found.
Date Deposited : 05 Sep 2018 12:20
Last Modified : 06 Jul 2019 05:26

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