Simulating the Onset of Grazing Envelope Evolution of Binary Stars

Abstract

We present the first three-dimensional gas-dynamical simulations of the grazing envelope evolution (GEE) of stars, with the goal of exploring the basic flow properties and the role of jets at the onset of the GEE. In the simulated runs, a secondary main-sequence star grazes the envelope of the primary asymptotic giant branch (AGB) star. The orbit is circular at the radius of the AGB primary star on its equator. We inject two opposite jets perpendicular to the equatorial plane from the location of the secondary star, and follow the evolution for several orbital periods. We explore the flow pattern by which the jets eject the outskirts of the AGB envelope. After one orbit the jets start to interact with gas ejected in previous orbits and inflate hot low-density bubbles.

Accepted for publication by MNRAS

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• Energizing the last phase of common envelope removal
• The planetary nebula IC 4776 and its post-common-envelope binary central star
• Variable jets at the termination of the common envelope evolution
• Common envelope: progress and transients