Protostars and Planets VI, Heidelberg, July 15-20, 2013

Poster 2K063

Magnetically driven wind from hot Jupiters

Tanaka, Yuki (Nagoya University)
Suzuki, Takeru (Nagoya University)
Inutsuka, Shu-ichiro (Nagoya University)

Recently theoretical studies on thermal evolution of hot jupiters invoked Ohmic dissipation to account for extraordinary large radii of some objects. Those analyses suggest the existence of significantly strong magnetic fields in hot Jupiters. To test this hypothesis it is important to investigate possible consequence of magnetic fields in gaseous giant planets. Since gaseous giant planets are supposed to have large convection zones, magnetic field mediates energy transfer from the interior to the exterior of the atmosphere. Atmospheric escape from hot Jupiters have been observed in some exoplanets by using transit method. But there are no previous works about magnetically driven wind from a gaseous planet. In this poster we develop a model of magnetically driven wind from a gaseous planet and investigate the resultant mass loss. We applied the theory of mass loss from the Sun to calculate mass loss rate from gaseous planet, especially from hot Jupiters. We got mass loss rate which is consistent with observational mass loss rate when we use parameters which are assumed to be typical value for hot Jupiters. This work may provide a possible consistency check of theories with observations of hot Jupiters.

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