Post-AGB discs from common-envelope evolution

Abstract

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 populations 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.

arXiv comment8 pages, refereed conference proceedings of the excellent Asymmetric Planetary Nebulae VII conference in Hong Kong, 2018 https://apn7.com/ published in Galaxies

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• The quest for Magrathea planets I: formation of second generation exoplanets around double white dwarfs
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• Excitation of post-AGB Star Binary Eccentricity by Massive Polar-Aligned Circumbinary Disks
• Modelling the impact of circumbinary disk accretion on post-AGB binary evolution and surface chemistry