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Galaxies 2018, 6(3), 96; https://doi.org/10.3390/galaxies6030096

The Morphology of the Outflow in the Grazing Envelope Evolution

Physics Department, Technion—Israel Institute of Technology, Technion City, Haifa 3200003, Israel
Received: 24 July 2018 / Revised: 30 August 2018 / Accepted: 31 August 2018 / Published: 6 September 2018
(This article belongs to the Special Issue Asymmetric Planetary Nebulae VII)
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Abstract

We study the grazing envelope evolution (GEE), where a secondary star, which orbits the surface of a giant star, accretes mass from the giant envelope and launches jets. We conduct simulations of the GEE with different half-opening angles and velocities, and simulate the onset phase and the spiralling-in phase. We discuss the resulting envelope structure and the outflow geometry. We find in the simulations of the onset phase with narrow jets that a large fraction of the ejected mass outflows along the polar directions. The mass ejected at these directions has the fastest velocity and the highest angular momentum magnitude. In the simulations of the spiralling-in phase, a large fraction of the ejected mass concentrates around the orbital plane. According to our findings, the outflow with the highest velocity is closer to the poles as we launch narrower jets. The outflow has a toroidal shape accompanied by two faster rings, one ring at each side of the equatorial plane. The interaction of the jets with the giant envelope causes these outflow structures, as we do not include in our simulations the secondary star gravity and the envelope self-gravity. View Full-Text
Keywords: binaries: close; stars: AGB and post-AGB; stars: winds, outflows; ISM: jets and outflows binaries: close; stars: AGB and post-AGB; stars: winds, outflows; ISM: jets and outflows
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Shiber, S. The Morphology of the Outflow in the Grazing Envelope Evolution. Galaxies 2018, 6, 96.

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