The TRAPPIST-1 system consists of seven Earth-sized planets that orbit very close to a red dwarf star.
Three of them could have the right conditions for life, but only two are potentially habitable.
The remaining two are too close to the star to be habitable, but there is still the question of whether they have atmospheres.
Using telescopes such as the JWST, astronomers estimate that they most likely do not have an atmosphere and may instead have a thin carbon dioxide atmosphere.
This is disappointing, since it would have been expected that planets d, e, f and g would have atmosphes.
The authors note that the TRAPPist-1 b does not have any obvious signs of an atmosphere either, possibly due to the lack of sufficient atmospheric water or to the fact that the star was so bright during this observation that it distorted the spectrum of light reflected from the planet.
The study is published in The Astrophysical Journal Letters.
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