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Searching for Geological Activity in a Rocky Exoplanet around a Sun-Like Star

Presentation #625.09 in the session Planetary Atmospheres - Terrestrial Planets and Mini-Neptunes.

Published onApr 03, 2024
Searching for Geological Activity in a Rocky Exoplanet around a Sun-Like Star

The atmospheres of rocky planets in the Solar System vary widely, and we expect rocky extrasolar planets to display an even greater diversity of properties. By characterizing this diversity, we can explore the factors that drive atmospheric evolution and escape, and, ultimately, the conditions necessary to form Earth-like worlds. HD 219134 b is the closest transiting exoplanet and one of the most observable rocky planets orbiting a Sun-like star. This planet’s close-in and eccentric orbit suggests that extreme tidal forces may be melting its mantle, which could result in Io-like volcanism or crustal sublimation. We present the results from our program, in which we observed four transits of HD 219134 b using the new Keck Planet Finder (KPF) to search for outgassed sodium and quantify this geological activity.

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