Atmospheric Retention on the Outer TRAPPIST-1 Planets: Implications for Habitability and Life around Ultracool Dwarfs

To the point

If you’re around TRAPPIST-1, the outer seven Earth-sized planets might keep their atmospheres for billions of years despite harsh space weather, because computer simulations plus simple calculations agree on it, which matters for their possible habitability and for finding life-friendly worlds around such stars, though there are many uncertainties.

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Atmospheric escape from the TRAPPIST-1 planets and implications for habitability
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Atmospheric escape from the TRAPPIST-1 planets and implications for habitability

The presence of an atmosphere over sufficiently long timescales is widely perceived as one of the most prominent criteria associated with planetary surface habitability. We address the crucial question of whether the seven Earth-sized planets