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.
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|Publisher Web site:||https://doi.org/10.3847/2041-8213/aa72da|
|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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