Stability of a moon of hot jupiter in red dwarf system

  • Thread starter Czcibor
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I was trying to calculate possible orbit of a potential exomoon of a hot jupiter within habitable zone of a red dwarf. Everything (heat absorbed, reasonably within Hill sphere, far from Roche limit) seamed reasonable. However, I encountered one problem - hot jupiter should be tidally locked. It means that it rotation period would be longer than any reasonable orbit for the moon, so the moon orbit should be subject to tidal orbit decay.

Does anyone know an approximate formula to calculate speed of tidal orbit decay? (Or maybe the process would be so slow or so quick that I have a conclusive answer without calculation?)
 

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