Which unique features should have a habitable planet originating from atmosphere stripped waterworld?

Premises:

• red dwarfs tend to have violent sun storms in their early years, thus are expected to strip atmosphere of planets that may be in their habitable zones;

• water worlds (including planets with hundreds kilometre ocean deep) seem to be quite common type of planets.

So at least in theory if one had a lucky combination, of watery Earth-like planet and right amount of atmosphere / water loss, then it should end up as a nice, habitable planet.

Nevertheless, I'm trying to avoid "it's just a tidally locked Earth analogue with troubled past and I happily found a scientifically plausible excuse how to squeeze it near red dwarf". I'm trying to actually find features of stripped water world which would have to be distinct and be direct consequence of such past.

So far the best thing I come up with is increased deuterium concentration. (as noticed in atmosphere of Venus) Any other ideas concerning atmosphere? Hydrosphere? Crust composition? Any still visible features, that billions years earlier the crust formed under water?

posted over 5 years ago

Shadow1024‭

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