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Aero-resonant migration

Storch, Natalia I. and Batygin, Konstantin (2019) Aero-resonant migration. Monthly Notices of the Royal Astronomical Society, 490 (2). pp. 1861-1869. ISSN 0035-8711. doi:10.1093/mnras/stz2614.

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The process of planet conglomeration, which primarily unfolds in a geometrically thin disc of gas and dust, is often accompanied by dynamical excitation of the forming planets and planetesimals. The ensuing orbital crossing can lead to large-scale collisional fragmentation, populating the system with icy and rocky debris. In a gaseous nebula, such leftover solid matter tends to spiral down towards the host star due to aerodynamic drag. Along the way, the inward drifting debris can encounter planets and gravitationally couple to them via mean-motion resonances, sapping them of their orbital energy and causing them to migrate. Here, we develop a simple theory for this migration mechanism, which we call ‘aero-resonant migration’ (ARM), in which small planetesimals (10 m ≲ s ≲ 10 km) undergo orbital decay due to aerodynamic drag and resonantly shepherd planets ahead of them. Using a combination of analytical calculations and numerical experiments, we show that ARM is a robust migration mechanism, able to significantly transport planets on time-scales ≲1 Myr, and present simple formulae for the ARM rate.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Batygin, Konstantin0000-0002-7094-7908
Additional Information:© 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model ( Accepted 2019 September 10. Received 2019 July 31; in original form 2019 March 19. Published: 19 September 2019. We are thankful to Alessandro Morbidelli, Sean Raymond, and Greg Laughlin for illuminating discussions, as well as to the anonymous referee for providing a thorough and insightful report. NIS gratefully acknowledges support through the Sherman Fairchild Fellowship at Caltech. KB gratefully acknowledges the David and Lucile Packard Foundation and the Alfred P. Sloan Foundation for their generous support.
Group:TAPIR, Walter Burke Institute for Theoretical Physics, Astronomy Department
Funding AgencyGrant Number
Sherman Fairchild FoundationUNSPECIFIED
David and Lucile Packard FoundationUNSPECIFIED
Alfred P. Sloan FoundationUNSPECIFIED
Subject Keywords:planets and satellites: dynamical evolution and stability, planets and satellites: formation
Issue or Number:2
Record Number:CaltechAUTHORS:20191119-074420025
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Official Citation:Natalia I Storch, Konstantin Batygin, Aero-resonant migration, Monthly Notices of the Royal Astronomical Society, Volume 490, Issue 2, December 2019, Pages 1861–1869,
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:99917
Deposited By: Tony Diaz
Deposited On:19 Nov 2019 15:54
Last Modified:16 Nov 2021 17:50

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