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Old 03-13-2020, 07:09 AM   #10
Daigoro
 
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Default Re: [Space] Climate & habitability of tide-locked planets

Quote:
Originally Posted by Agemegos View Post
⁸ I consider it unfortunate that the cases they published involved (a) one rotation per 24 hours, which is a lot faster than we expect for any habitability candidate, and (b) one rotation per 8 640 hours, which is a good deal slower than we expect for any habitability candidate.
One rotation per 24 hours is fair enough- it allows them to easily compare to Earth, isolating from other factors. And it might be close enough to good candidates. Looking at TRAPPIST-1e, chosen because it's terrestrial size and in the habitable zone (albeit lacking water), it has a 6 day period, so it's Coriolis effect would be within an order of magnitude of Earth's.

Actually, 1d appears it might have watery oceans, despite being inside the habitable zone (however that happens), and it has a 4 day period.

ETA: Another planetary heating mechanism that wasn't mentioned is geothermal heating. This Wikipedia entry suggests that 1d might have geothermal activity to due tidal locking with the primary, so that could be another mechanism for warming the nightside.

ETA2: Agemegos, I refer you to Carone, et al's paper, Stratosphere circulation on tidally locked ExoEarths, for some in-depth discussion of different polar-equatorial transport regimes. It might give you some useful insights.
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Last edited by Daigoro; 03-13-2020 at 08:09 AM.
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