The planet is only 1.3 times larger than the Earth and revolves around a dim star, to which it is close enough to warm up. A complete revolution around the luminary LHS 3844b takes 11 days. But the observations that were carried out with the Spitzer telescope showed that there was most likely no atmosphere on it.
The data obtained by the researchers for a long time did not fit into any of the models considered by the authors. They corresponded neither to the atmosphere in which carbon dioxide dominates, nor to nitrogen, as on Earth. If there is still an atmosphere on LHS 3844b, it does not exceed the Martian density, which is extremely unexpected for a planet of this size. However, this is precisely what the observational data indicate: most likely, LHS 3844b is a basalt desert, completely devoid of atmosphere, something like the Moon or Mercury.
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Probably, proximity to even a very dim star is dangerous for the atmosphere of the planet and life on it. A continuous stream of radiation and particles can carry the atmosphere into outer space.