INFLATING HOT JUPITERS WITH OHMIC DISSIPATION

2010/02/19 by Konstantin Batygin, David J. Stevenson · 12 citations
Physics and Astronomy · #Astronomy and Astrophysical Research #Computation #Cosmology and Gravitation Theories #Dissipation #Exoplanet #Hot Jupiter #Magnetohydrodynamic drive #Mechanism (biology) #Planet #RADIUS #Stellar, planetary, and galactic studies #astro-ph.EP

paper · pdf · doi:10.1088/2041-8205/714/2/l238

published as The Astrophysical Journal Letters 714 (2010) L28 · 6 pages, 3 figures, 1 table. Submitted to Astrophysical Journal Letters

arxiv created 2010/02/19 · openalex publication_date 2010/04/15 · arxiv updated 2010/04/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

We present a new, magnetohydrodynamic mechanism for inflation of close-in giant extrasolar planets. The idea behind the mechanism is that current, which is induced through interaction of atmospheric winds and the planetary magnetic field, results in significant Ohmic dissipation of energy in the interior. We develop an analytical model for computation of interior Ohmic dissipation, with a simplified treatment of the atmosphere. We apply our model to HD209458b, Tres-4b, and HD189733b. With conservative assumptions for wind speed and field strength, our model predicts a generated power that appears to be large enough to maintain the transit radii, opening an unexplored avenue toward solving a decade-old puzzle of extrasolar gas giant radius anomalies.

Citations

• Atmospheric Circulation of Hot Jupiters: Three‐dimensional Circulation Models of HD 209458b and HD 189733b with Simplified Forcing
• Obliquity Tides on Hot Jupiters

Cited by

• Atmospheric Regimes and Trends on Exoplanets and Brown Dwarfs
• ULTRACAM z′-band detection of the secondary eclipse of WASP-12b
• THE TRANSIT LIGHT-CURVE PROJECT. XIV. CONFIRMATION OF ANOMALOUS RADII FOR THE EXOPLANETS TrES-4b, HAT-P-3b, AND WASP-12b
• PLANET OCCURRENCE WITHIN 0.25 AU OF SOLAR-TYPE STARS FROM KEPLER
• The Strongest Magnetic Fields on the Coolest Brown Dwarfs
• PHOTOMETRICALLY DERIVED MASSES AND RADII OF THE PLANET AND STAR IN THE TrES-2 SYSTEM
• A GENERAL CIRCULATION MODEL FOR GASEOUS EXOPLANETS WITH DOUBLE-GRAY RADIATIVE TRANSFER
• Energy Dissipation in the Upper Atmospheres of TRAPPIST-1 Planets
• DYNAMICAL MEASUREMENTS OF THE INTERIOR STRUCTURE OF EXOPLANETS
• Feature-rich transmission spectrum for WASP-127b
• Atmospheric Characterization via Broadband Color Filters on the PLAnetary Transits and Oscillations of stars (PLATO) Mission
• EXTENDED HEAT DEPOSITION IN HOT JUPITERS: APPLICATION TO OHMIC HEATING

Related

• Inflated hot Jupiters: Inferring average atmospheric velocity via Ohmic models coupled with internal dynamo evolution
• The role of Ohmic dissipation of internal currents on Hot Jupiter radii
• Stellar Magnetic Fields as a Heating Source for Extrasolar Giant Planets
• The Hot Jupiter Radius Anomaly and Stellar Connections
• Non-ideal MHD simulations of hot Jupiter atmospheres