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Author Batygin, Konstantin ♦ Stevenson, David J.
Source arXiv.org
Content type Text
File Format PDF
Date of Submission 2010-02-18
Language English
Subject Domain (in DDC) Computer science, information & general works ♦ Natural sciences & mathematics ♦ Astronomy & allied sciences ♦ Physics
Subject Keyword Astrophysics - Earth and Planetary Astrophysics ♦ physics:astro-ph
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 towards solving a decade-old puzzle of extrasolar gas giant radius anomalies.
Description Reference: The Astrophysical Journal Letters 714 (2010) L28
Educational Use Research
Learning Resource Type Article
Page Count 6


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