Hot Jupiter satellites

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Hot Jupiter satellites

Post by Lazarus on 7th September 2009, 1:49 pm

Interesting study of hot Jupiter satellites - apparently the tidal Q factor of 105 typically used for giant planets may be a significant underestimate, which may mean massive satellites around hot Jupiters can exist. The evaporation of such satellites suggests that for hot Jupiters with periods longer than 2.46.6 days (depending on efficiency of heat redistribution around the satellite), detectable Earth-size moons could perhaps exist.
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Re: Hot Jupiter satellites

Post by Edasich on 10th September 2009, 11:46 am

But really would these satellites be stable around hot jupiters? Even accounting extreme closeness to host star?
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Re: Hot Jupiter satellites

Post by Sirius_Alpha on 10th September 2009, 12:40 pm

Maybe, it depends on if their hypothesis about the efficiency of tidal dissipation is supported or not, if so..
even Earth-size satellites may be stable around hot Jupiters over Gyr timescales.

However the tidal effects would be interesting.
Large tidal dissipation rates are induced in the satellite due to its fored orbital variations, likely melting all but perhaps a thin surface layer.

The atmosphere of the Hot Jupiter can't be too extended, else the satellite would experience orbital drag.

I assume that the sort of hot Jupiters mentioned here are less HAT-P-7 b - like, and more 55 Cancri b - like, as they discus planet orbital periods in terms of > 6 days as having the greatest chance of having detectable moons.

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