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Magnetic energy fluxes in close-in star-planet systems

Published online by Cambridge University Press:  09 September 2016

A. Strugarek ,
A. S. Brun ,
S. P. Matt  and
V. Réville
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. Réville
Affiliation:
CEA-Saclay, IRFU/SAp, Gif-sur-Yvette, France
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Abstract

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Magnetic interactions between a close-in planet and its host star have been postulated to be a source of enhanced chromospheric emissions. We develop three dimensional global models of star-planet systems under the ideal magnetohydrodynamic (MHD) approximation to explore the impact of magnetic topology on the energy fluxes induced by the magnetic interaction. We conduct twin numerical experiments in which only the magnetic topology of the interaction is altered. We find that the Poynting flux varies by more than an order of magnitude when varying the magnetic topology from an aligned case to an anti-aligned case. This provides a simple and robust physical explanation for on/off enhanced chromospheric emissions induced by a close-in planet on time-scales of the order of days to years.

Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 11 , Symposium S320: Solar and Stellar Flares and their Effects on Planets , August 2015 , pp. 403 - 408
Copyright
Copyright © International Astronomical Union 2016 

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