The Hottest Hot Jupiters May Host Atmospheric Dynamos

Tamara Rogers, J. N. McElwaine

Research output: Contribution to journalArticle

8 Citations (Scopus)

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.

Original languageEnglish (US)
Article numberL26
JournalAstrophysical Journal Letters
Volume841
Issue number2
DOIs
StatePublished - Jun 1 2017

Fingerprint

rotating generators
Jupiter (planet)
Jupiter
planets
planetary evolution
planet
planetary magnetic fields
magnetic field
stars
atmospheric dynamics
magnetohydrodynamic simulation
extrasolar planets
magnetohydrodynamics
field strength
conductivity
heating
geometry
atmospheres
atmosphere
magnetic fields

Keywords

  • dynamo
  • magnetohydrodynamics (MHD)
  • planets and satellites: gaseous planets

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

The Hottest Hot Jupiters May Host Atmospheric Dynamos. / Rogers, Tamara; McElwaine, J. N.

In: Astrophysical Journal Letters, Vol. 841, No. 2, L26, 01.06.2017.

Research output: Contribution to journalArticle

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