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MOVES – V. Modelling star–planet magnetic interactions of HD 189733
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Strugarek, A., Fares, R., Bourrier, V., Brun, A. S., Réville, V., Amari, T., Helling, Ch., Jardine, M., Llama, J., Moutou, C., Vidotto, A. A., Wheatley, P. J. and Zarka, P. (2022) MOVES – V. Modelling star–planet magnetic interactions of HD 189733. Monthly Notices of the Royal Astronomical Society, 512 (3). pp. 4556-4572. doi:10.1093/mnras/stac778 ISSN 1365-2966.
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WRAP-MOVES-V-Modelling-star–planet-magnetic-interactions-HD-189733-22.pdf - Published Version - Requires a PDF viewer. Download (3081Kb) | Preview |
Official URL: https://doi.org/10.1093/mnras/stac778
Abstract
Magnetic interactions between stars and close-in planets may lead to a detectable signal on the stellar disc. HD 189733 is one of the key exosystems thought to harbour magnetic interactions, which may have been detected in 2013 August. We present a set of 12 wind models at that period, covering the possible coronal states and coronal topologies of HD 189733 at that time. We assess the power available for the magnetic interaction and predict its temporal modulation. By comparing the predicted signal with the observed signal, we find that some models could be compatible with an interpretation based on star–planet magnetic interactions. We also find that the observed signal can be explained only with a stretch-and-break interaction mechanism, while that the Alfvén wings scenario cannot deliver enough power. We finally demonstrate that the past observational cadence of HD 189733 leads to a detection rate of only between 12 and 23 per cent, which could explain why star–planet interactions have been hard to detect in past campaigns. We conclude that the firm confirmation of their detection will require dedicated spectroscopic observations covering densely the orbital and rotation period, combined with scarcer spectropolarimetric observations to assess the concomitant large-scale magnetic topology of the star.
Item Type: | Journal Article | ||||||||||||||||||||||||||||||||||||
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Subjects: | Q Science > QB Astronomy | ||||||||||||||||||||||||||||||||||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||||||||||||||||||||||||||||||
SWORD Depositor: | Library Publications Router | ||||||||||||||||||||||||||||||||||||
Library of Congress Subject Headings (LCSH): | Planets -- Magnetospheres , Stellar winds | ||||||||||||||||||||||||||||||||||||
Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society | ||||||||||||||||||||||||||||||||||||
Publisher: | Oxford University Press (OUP) | ||||||||||||||||||||||||||||||||||||
ISSN: | 1365-2966 | ||||||||||||||||||||||||||||||||||||
Official Date: | May 2022 | ||||||||||||||||||||||||||||||||||||
Dates: |
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Volume: | 512 | ||||||||||||||||||||||||||||||||||||
Number: | 3 | ||||||||||||||||||||||||||||||||||||
Page Range: | pp. 4556-4572 | ||||||||||||||||||||||||||||||||||||
DOI: | 10.1093/mnras/stac778 | ||||||||||||||||||||||||||||||||||||
Status: | Peer Reviewed | ||||||||||||||||||||||||||||||||||||
Publication Status: | Published | ||||||||||||||||||||||||||||||||||||
Re-use Statement: | This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society © 2022 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. | ||||||||||||||||||||||||||||||||||||
Access rights to Published version: | Open Access (Creative Commons) | ||||||||||||||||||||||||||||||||||||
Date of first compliant deposit: | 15 November 2022 | ||||||||||||||||||||||||||||||||||||
Date of first compliant Open Access: | 15 November 2022 | ||||||||||||||||||||||||||||||||||||
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