A well studied exoplanet here
Does the exoplanet TRAPPIST-1 b have an atmosphere after all?
https://phys.org/news/2024-12-exoplanet-trappist-atmosphere.html
"...The crust of TRAPPIST-1 b could be geologically active "However, the idea of a rocky planet with a heavily weathered surface without an atmosphere is inconsistent with the current measurement," says MPIA astronomer Jeroen Bouwman, who was jointly responsible for the observation program. "Therefore, we think the planet is covered with relatively unchanged material." Usually, the surface is weathered by the radiation of the central star and impacts from meteorites. However, the results suggest that the rock on the surface is at most about 1000 years old, significantly less than the planet itself, which is estimated to date back several billion years. This could indicate that the planet's crust is subject to dramatic changes, which could be explained by extreme volcanism or plate tectonics."
My note, still nothing definite about TRAPPIST-1 b containing an atmosphere and there exist age conflict calculations too concerning the surface age and system age, some 7 Gyr or older in various sources. Other past reports on this exoplanet.
This TRAPPIST-1 exoplanet seems to have no atmosphere — the truth may hide in its star, James Webb Space Telescope reveals,
https://forums.space.com/threads/th...tar-james-webb-space-telescope-reveals.63312/
James Webb Space Telescope's first spectrum of a TRAPPIST-1 planet,
https://phys.org/news/2023-09-james-webb-space-telescope-spectrum.html
My note, TRAPPIST-1 b may indeed be a *bare rock* and if the other TRAPPIST-1 system exoplanets are similar (little or no atmospheres), that would pose challenges for astrobiology.
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