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Inflating Hot Jupiters with Ohmic Dissipation

Batygin, Konstantin and Stevenson, David J. (2010) Inflating Hot Jupiters with Ohmic Dissipation. Astrophysical Journal Letters, 714 (2). L238-L243. ISSN 2041-8205.

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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.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Batygin, Konstantin0000-0002-7094-7908
Stevenson, David J.0000-0001-9432-7159
Additional Information:© 2010 The American Astronomical Society. Received 2010 February 18; accepted 2010 March 23; published 2010 April 15. We thank G. Laughlin, P. Bodenheimer, D. Charbonneau, A. Showman, J. Liu, H. Knutson, A. Wolf, and M. Line for useful discussions and the anonymous referee for insightful comments
Subject Keywords:magnetohydrodynamics (MHD) methods: analytical planets and satellites: interiors
Issue or Number:2
Classification Code:PACS: 97.82.-j; 97.10.Me; 95.30.Qd
Record Number:CaltechAUTHORS:20100521-133419708
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Official Citation:Konstantin Batygin and David J. Stevenson 2010 ApJ 714 L238 doi: 10.1088/2041-8205/714/2/L238
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:18395
Deposited By: Ruth Sustaita
Deposited On:21 May 2010 20:57
Last Modified:09 Mar 2020 13:18

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