Post-AGB Discs from Common-Envelope Evolution
Department of Physics, University of Surrey, Guildford, Surrey GU2 7XH, UK
Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA, UK
Author to whom correspondence should be addressed.
Received: 26 July 2018 / Revised: 3 September 2018 / Accepted: 4 September 2018 / Published: 11 September 2018
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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
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.
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MDPI and ACS Style
Izzard, R.G.; Jermyn, A.S. Post-AGB Discs from Common-Envelope Evolution. Galaxies 2018, 6, 97.
Izzard RG, Jermyn AS. Post-AGB Discs from Common-Envelope Evolution. Galaxies. 2018; 6(3):97.
Izzard, Robert G.; Jermyn, Adam S. 2018. "Post-AGB Discs from Common-Envelope Evolution." Galaxies 6, no. 3: 97.
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