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The hottest hot Jupiters may host atmospheric dynamos.

Rogers, T.M. and McElwaine, J. N. (2017) 'The hottest hot Jupiters may host atmospheric dynamos.', Astrophysical journal letters., 841 (2). L26.


Hot Jupiters have proven themselves to be a rich class of exoplanets that test our theories of planetary evolution and atmospheric dynamics under extreme conditions. Here, we present three-dimensional magnetohydrodynamic simulations and analytic results that demonstrate that a dynamo can be maintained in the thin, stably stratified atmosphere of a hot Jupiter, independent of the presumed deep-seated dynamo. This dynamo is maintained by conductivity variations arising from strong asymmetric heating from the planets' host star. The presence of a dynamo significantly increases the surface magnetic field strength and alters the overall planetary magnetic field geometry, possibly affecting star–planet magnetic interactions.

Item Type:Article
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Publisher statement:© 2017. The American Astronomical Society. All rights reserved.
Date accepted:12 May 2017
Date deposited:07 June 2017
Date of first online publication:26 May 2017
Date first made open access:07 June 2017

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