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Magnetically Controlled Circulation on Hot Extrasolar Planets

Batygin, Konstantin and Stanley, Sabine and Stevenson, David J. (2013) Magnetically Controlled Circulation on Hot Extrasolar Planets. Astrophysical Journal, 776 (1). Art. No. 53. ISSN 0004-637X. https://resolver.caltech.edu/CaltechAUTHORS:20131104-090105732

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Abstract

Through the process of thermal ionization, intense stellar irradiation renders hot Jupiter atmospheres electrically conductive. Simultaneously, lateral variability in the irradiation drives the global circulation with peak wind speeds of the order of ~km s^(–1). In turn, the interactions between the atmospheric flows and the background magnetic field give rise to Lorentz forces that can act to perturb the flow away from its purely hydrodynamical counterpart. Using analytical theory and numerical simulations, we show here that significant deviations away from axisymmetric circulation are unstable in presence of a non-negligible axisymmetric magnetic field. Specifically, our results suggest that dayside-to-nightside flows, often obtained within the context of three-dimensional circulation models, only exist on objects with anomalously low magnetic fields, while the majority of highly irradiated exoplanetary atmospheres are entirely dominated by zonal jets.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1088/0004-637X/776/1/53DOIArticle
http://iopscience.iop.org/0004-637X/776/1/53PublisherArticle
http://arxiv.org/abs/1307.8038arXivDiscussion Paper
ORCID:
AuthorORCID
Batygin, Konstantin0000-0002-7094-7908
Stanley, Sabine0000-0002-4039-2809
Stevenson, David J.0000-0001-9432-7159
Additional Information:© 2013 American Astronomical Society. Received 2013 May 31; accepted 2013 July 29; published 2013 September 25. We thank Adam Showman, Kristen Menou, Peter Goldreich, and Greg Laughlin for useful conversations, as well as the anonymous referee for a thorough and insightful report. K.B. acknowledges the generous support from the ITC Prize Postdoctoral Fellowship at the Institute for Theory and Computation, Harvard-Smithsonian Center for Astrophysics. S.S. acknowledges funding by the Natural Sciences and Engineering Research Council of Canada (NSERC) and the Alfred P. Sloan Foundation.
Funders:
Funding AgencyGrant Number
Institute for Theory and Computation ITC Prize Postdoctoral FellowshipUNSPECIFIED
Harvard-Smithsonian Center for AstrophysicsUNSPECIFIED
Natural Sciences and Engineering Research Council of Canada (NSERC)UNSPECIFIED
Alfred P. Sloan FoundationUNSPECIFIED
Subject Keywords: planets and satellites: atmospheres; planets and satellites: magnetic fields
Issue or Number:1
Record Number:CaltechAUTHORS:20131104-090105732
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20131104-090105732
Official Citation:Magnetically Controlled Circulation on Hot Extrasolar Planets Konstantin Batygin et al. 2013 ApJ 776 53
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:42211
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:04 Nov 2013 17:17
Last Modified:09 Mar 2020 13:19

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