Webb Telescope Probes TRAPPIST-1 e for Atmosphere Clues

NASA's James Webb Space Telescope is investigating TRAPPIST-1 e, an Earth-sized exoplanet in the habitable zone of its star. Initial observations using Webb's infrared instruments suggest that TRAPPIST-1 e likely lacks its primary atmosphere, typically composed of hydrogen and helium, due to the star's intense radiation. However, the possibility of a secondary atmosphere remains open. Researchers are employing innovative methods to analyze the planet's atmospheric composition by comparing data from transits of TRAPPIST-1 e and its neighboring planet, TRAPPIST-1 b, which is believed to be a bare rock.

The study aims to determine if TRAPPIST-1 e could harbor liquid water, potentially sustained by a greenhouse effect. While the presence of carbon dioxide in the atmosphere is uncertain, it could indicate conditions suitable for water in some form, possibly as a global ocean or localized bodies of water. The research is part of a broader effort to understand the potential habitability of exoplanets.

The findings are detailed in two papers published in the Astrophysical Journal Letters. The ongoing research is led by Néstor Espinoza and Natalie Allen, with 15 additional observations planned to refine the understanding of TRAPPIST-1 e's atmosphere.