Outward Migration of Super-Jupiters

Dempsey, Adam M. and Muñoz, Diego J. and Lithwick, Yoram (2021) Outward Migration of Super-Jupiters. The Astrophysical Journal Letters, 918 (2). L36. ISSN 2041-8205

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Abstract

Recent simulations show that giant planets of about 1 MJ migrate inward at a rate that differs from the type II prediction. Here we show that at higher masses, planets migrate outward. Our result differs from previous ones because of our longer simulation times, lower viscosity, and boundary conditions that allow the disk to reach a viscous steady state. We show that, for planets on circular orbits, the transition from inward to outward migration coincides with the known transition from circular to eccentric disks that occurs for planets more massive than a few Jupiters. In an eccentric disk, the torque on the outer disk weakens due to two effects: the planet launches weaker waves, and those waves travel further before damping. As a result, the torque on the inner disk dominates, and the planet pushes itself outward. Our results suggest that the many super-Jupiters observed by direct imaging at large distances from the star may have gotten there by outward migration.

Item Type: Article
Subjects: Science Global Plos > Physics and Astronomy
Depositing User: Unnamed user with email support@science.globalplos.com
Date Deposited: 13 May 2023 08:12
Last Modified: 29 Jan 2024 06:17
URI: http://ebooks.manu2sent.com/id/eprint/780

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