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Observational consequences of shallow-water magnetohydrodynamics on hot Jupiters

Lookup NU author(s): Dr Alex HindleORCiD, Professor Paul BushbyORCiD, Professor Tamara Rogers



This is the authors' accepted manuscript of an article that has been published in its final definitive form by Institution of Physics, 2021.

For re-use rights please refer to the publisher's terms and conditions.


We use results of shallow-water magnetohydrodynamics (SWMHD) to place estimates on the minimum magnetic field strengths required to cause atmospheric wind variations (and therefore westward venturing hotspots) for a dataset of hot Jupiters (HJs), including HAT-P-7b, CoRoT-2b, Kepler-76, WASP-12b, and WASP-33b, on which westward hotspots have been observationally inferred. For HAT-P-7b and CoRoT-2b our estimates agree with past results; for Kepler-76b we find that the critical dipolar magnetic field strength, over which the observed wind variations can be explained by magnetism, lies between 4G and 19 G; for WASP-12b and WASP-33b westward hotspots can be explained by 1G and 2G dipolar fields respectively. Additionally, to guide future observational missions, we identify 61 further HJs that are likely to exhibit magnetically-driven atmospheric wind variations and predict these variation are highly-likely in ~ 40 of the hottest HJs.

Publication metadata

Author(s): Hindle AW, Bushby PJ, Rogers TM

Publication type: Article

Publication status: Published

Journal: The Astrophysical Journal Letters

Year: 2021

Volume: 916

Issue: 1

Online publication date: 26/07/2021

Acceptance date: 30/06/2021

Date deposited: 13/07/2021

ISSN (print): 2041-8205

ISSN (electronic): 2041-8213

Publisher: Institution of Physics


DOI: 10.3847/2041-8213/ac0fec


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