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I found this original work about the possibility of life in a superearth so massive to retain its hydrogen envelope:
https://www.mdpi.com/2075-1729/4/4/716/htm
Hydrogen superearths are rocky planets up to 10 Earth masses with liquid water oceans, continents but have an atmosphere mostly composed by hydrogen rather than nitrogen.
It's very interesting to note that synthesizing carbohydrates from methane and light requires less energy than doing the same thing from CO2 and light, like plants do on our Earth. So hydrogen superearths have a habitable more wide than nitrogen-oxygen planets, and hydrogen photosynthesis can work well even in infrared band with wavelength up to 1.5 micron.
Last edited by Quaoar (2021-03-27 05:15:21)
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Life can Thrive Around Even the Smallest Stars
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