ProtoJeb21
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Maybe a SIXTH planet around EPIC 220221272, a red dwarf with five rocky planet candidates, one in the habitable zone. This new one is the smallest of the system and is a much better candidate for habitability.
https://www.zooniverse.org/projects/ianc2/exoplanet-explorers/talk/821/320198?comment=679398&page=22
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The one 2.5x the radius of Earth? That sounds more like a mini-neptune or super water-world.
Oh wait, yours was at the bottom, the one I saw was the bigger one.
Anyway, you also found a sub-Mercury planet in the HZ? What are the odds of it being habitable? I doubt they're good, since the core probably long died by now, but could it once have been habitable?
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There are two ways that Sub-Mercury could've formed: either it naturally grew into a small rocky world, or it's the core of a small ocean planet. The original object could've been around the size of Mars or Trappist-1h and made of about 50-75% water. It would migrate inwards and thaw out. However, it would have a horrifically weak magnetosphere, so it's atmosphere would be blown off and the water not far behind. What would be left is a small, dense object rich in silicates and iron but completely bone-dry.
So yeah, this thing is dead. It's also possible that the star - and the planet as well - actually are larger, which may either boost or destroy the chances for this world hosting life.
