Magnetic effects in hot Jupiter atmospheres

T. M. Rogers, T. D. Komacek

Research output: Contribution to journalArticlepeer-review

52 Scopus citations

Abstract

We present magnetohydrodynamic simulations of the atmospheres of hot Jupiters ranging in temperature from 1100 to 1800 K. Magnetic effects are negligible in atmospheres with temperatures ≲1400 K. At higher temperatures winds are variable and, in many cases, mean equatorial flows can become westward, opposite to their hydrodynamic counterparts. Ohmic dissipation peaks at temperatures 1500-1600 K, depending on field strength, with maximum values 1018 W at 10 bars, substantially lower than previous estimates. Based on the limited parameter study done, this value cannot be increased substantially with increasing winds, higher temperatures, higher field strengths, different boundary conditions, or lower diffusivities. Although not resolved in these simulations, there is modest evidence that a magnetic buoyancy instability may proceed in hot atmospheres.

Original languageEnglish (US)
Article number132
JournalAstrophysical Journal
Volume794
Issue number2
DOIs
StatePublished - Oct 20 2014

Keywords

  • hydrodynamics
  • magnetohydrodynamics (MHD)

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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