Observational Consequences of Shallow-water Magnetohydrodynamics on Hot Jupiters. (arXiv:2107.10848v1 [astro-ph.EP])
<a href="http://arxiv.org/find/astro-ph/1/au:+Hindle_A/0/1/0/all/0/1">A. W. Hindle</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Bushby_P/0/1/0/all/0/1">P. J. Bushby</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Rogers_T/0/1/0/all/0/1">T. M. Rogers</a>

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 $4mbox{ G}$ and
$19mbox{ G}$; for WASP-12b and WASP-33b westward hotspots can be explained by
$1mbox{ G}$ and $2mbox{ G}$ 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 variations are highly-likely in $sim 40$ of the hottest HJs.

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 $4mbox{ G}$ and
$19mbox{ G}$; for WASP-12b and WASP-33b westward hotspots can be explained by
$1mbox{ G}$ and $2mbox{ G}$ 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 variations are highly-likely in $sim 40$ of the hottest HJs.

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