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Title: The Hottest Hot Jupiters May Host Atmospheric Dynamos

Abstract

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.

Authors:
 [1];  [2]
  1. Department of Mathematics and Statistics, Newcastle University, Newcastle upon Tyne (United Kingdom)
  2. Planetary Science Institute, Tucson, AZ 85721 (United States)
Publication Date:
OSTI Identifier:
22654466
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal Letters; Journal Volume: 841; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ASYMMETRY; ATMOSPHERES; INTERACTIONS; JUPITER PLANET; MAGNETIC FIELDS; MAGNETOHYDRODYNAMICS; SATELLITES; SIMULATION; SOLAR SYSTEM EVOLUTION; STARS; SURFACES; THREE-DIMENSIONAL CALCULATIONS

Citation Formats

Rogers, T. M., and McElwaine, J. N. The Hottest Hot Jupiters May Host Atmospheric Dynamos. United States: N. p., 2017. Web. doi:10.3847/2041-8213/AA72DA.
Rogers, T. M., & McElwaine, J. N. The Hottest Hot Jupiters May Host Atmospheric Dynamos. United States. doi:10.3847/2041-8213/AA72DA.
Rogers, T. M., and McElwaine, J. N. Thu . "The Hottest Hot Jupiters May Host Atmospheric Dynamos". United States. doi:10.3847/2041-8213/AA72DA.
@article{osti_22654466,
title = {The Hottest Hot Jupiters May Host Atmospheric Dynamos},
author = {Rogers, T. M. and McElwaine, J. N.},
abstractNote = {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.},
doi = {10.3847/2041-8213/AA72DA},
journal = {Astrophysical Journal Letters},
number = 2,
volume = 841,
place = {United States},
year = {Thu Jun 01 00:00:00 EDT 2017},
month = {Thu Jun 01 00:00:00 EDT 2017}
}