[fidelis]

If liquid water does exist on planet d, it would likely be confined to one half of the planet — unlike Earth, planet d is tidally locked, meaning the same side of the exoplanet is always facing its host star, and temperatures in that hemisphere are likely too hot for liquid water.

It's hard to imagine a planet being so hot on one side being able to sustain life on the other side. Any chance of the planet developing anything like a life-sustaining atmosphere would have it burned away by the heat coming from the hot side of the planet.

[Fai Mao]

This thing sounds like a really big moon, not a planet.