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Galaxies 2018, 6(4), 113;

Planetary Nebulae Shaped by Common Envelope Evolution

Department of Physics and Astronomy, University of Rochester, Rochester, NY 14627, USA
Department of Physics & Astronomy, Macquarie University, Sydney, NSW 2109, Australia
National Technical Institute for the Deaf, Rochester Institute of Technology, Rochester, NY 14623, USA
Author to whom correspondence should be addressed.
Received: 16 July 2018 / Revised: 29 September 2018 / Accepted: 2 October 2018 / Published: 26 October 2018
(This article belongs to the Special Issue Asymmetric Planetary Nebulae VII)
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The morphologies of planetary nebula have long been believed to be due to wind shaping processes in which a “fast wind” from the central star impacts a previously ejected envelope. It is assumed that asymmetries existing in the “slow wind” envelope would lead to inertial confinement, shaping the resulting interacting wind flow. We present new results demonstrating the effectiveness of Common Envelope Evolution (CEE) at producing aspherical envelopes which, when impinged upon by a spherical fast stellar wind, produce highly bipolar, jet-like outflows. We have run two simple cases using the output of a single PHANTOM SPH CEE simulation. Our work uses the Adaptive Mesh Refinement code AstroBEAR to track the interaction of the fast wind and CEE ejecta allows us to follow the morphological evolution of the outflow lobes at high resolution in 3-D. Our two models bracket low and high momentum output fast winds. We find the interaction leads to highly collimated bipolar outflows. In addition, the bipolar morphology depends on the fast wind momentum injection rate. With this dependence comes the initiation of significant symmetry breaking between the top and bottom bipolar lobes. Our simulations, though simplified, confirm the long-standing belief that CEE can plan a major role in PPN and PN shaping. These simulations are intended as an initial exploration of the post-CE/PPN flow patterns that can be expected from central source outflows and CE ejecta. View Full-Text
Keywords: post-AGB stars; pre-PN hydrodynamic models; planetary nebulae: Common Envelope; planetary nebulae: individual (OH231+8+04.2) post-AGB stars; pre-PN hydrodynamic models; planetary nebulae: Common Envelope; planetary nebulae: individual (OH231+8+04.2)

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Frank, A.; Chen, Z.; Reichardt, T.; De Marco, O.; Blackman, E.; Nordhaus, J. Planetary Nebulae Shaped by Common Envelope Evolution. Galaxies 2018, 6, 113.

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