I've been on other projects which I am hoping to post on other fora, so have neglected this blog. I do wish to discuss Trappist 1's inner planets meanwhile. JWST has a report on -d.
The present consensus runs that -c is airless. This was thought for innermost -b too; now, JWST claims -b has thick supercritical carbon-dioxide atmosphere "with a hydrocarbon smog". The present study looks at -d. This like -c has turned up nothing.
"Turns up nothing" doesn't mean nothing; Mars has something, but Elon doesn't care, since we cannot breathe on it. More of interest for -d is the counterclaim: that a thick cloudlayer shrouds the dark side. We'd be able to see the edges of that at the edges of either transit. Climate models - they say - allow this for such an insolation around such a red-shifted star.
My counter to the counter: planetary-formation models. Trappist-1's planets are in mutual resonance. They formed where they are without interference. Then the star did its T-Tauri thing. The T-Tauri phase enforced a coal line, which starts far away from -d. These planets, then, did not form with water. Nor with ammonia, methane what-have-you.
Whaddabout Venus, I hear my readers. To whom I am sympathetic. I did think T1-c, closer to the star, would be a Venuslike! but... it's not. As for T1-d, Venus is more massive. When our Sun was T-Tauri, Venus was further away than T1 b,c,d to T1... by a lot.
I'd hold the counterclaim for some other inner-HZ planet in a nonresonant M system.
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