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Planet migration and magnetic torques

Published online by Cambridge University Press:  27 October 2016

A. Strugarek ,
A. S. Brun ,
S. P. Matt  and
V. Reville
A. Strugarek
Affiliation:
Université de Montréal, C.P. 6128 Succ. Centre-Ville, Montréal, QC H3C-3J7, Canada email: strugarek@astro.umontreal.ca CEA-Saclay, IRFU/SAp, Gif-sur-Yvette, France
A. S. Brun
Affiliation:
CEA-Saclay, IRFU/SAp, Gif-sur-Yvette, France
S. P. Matt
Affiliation:
Department of Physics & Astronomy, University of Exter, EX2 4QL, UK
V. Reville
Affiliation:
CEA-Saclay, IRFU/SAp, Gif-sur-Yvette, France
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Abstract

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The possibility that magnetic torques may participate in close-in planet migration has recently been postulated. We develop three dimensional global models of magnetic star-planet interaction under the ideal magnetohydrodynamic (MHD) approximation to explore the impact of magnetic topology on the development of magnetic torques. We conduct twin numerical experiments in which only the magnetic topology of the interaction is altered. We find that magnetic torques can vary by roughly an order of magnitude when varying the magnetic topology from an aligned case to an anti-aligned case. Provided that the stellar magnetic field is strong enough, we find that magnetic migration time scales can be as fast as ~100 Myr. Hence, our model supports the idea that magnetic torques may participate in planet migration for some close-in star-planet systems.

Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 11 , General Assembly A29A: Astronomy in Focus , August 2015 , pp. 14 - 18
Copyright
Copyright © International Astronomical Union 2016 

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