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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

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

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Abstract

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

URL: https://doi.org/10.3847/2041-8213/ac0fec

DOI: 10.3847/2041-8213/ac0fec

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