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Understanding the effects of high-energy radiation and stellar winds onplanetary atmospheres is vital for explaining the observed properties ofclose-in exoplanets. Observations of transiting exoplanets in the triplet ofmetastable helium lines at 10830 A allow extended atmospheres and escapeprocesses to be studied for individual planets. We observed one transit ofWASP-107b with NIRSPEC on Keck at 10830 A. Our observations, for the firsttime, had significant post-transit phase coverage, and we detected excessabsorption for over an hour after fourth contact. The data can be explained bya comet-like tail extending out to ~7 planet radii, which corresponds toroughly twice the Roche lobe radius of the planet. Planetary tails are expectedbased on 3D simulations of escaping exoplanet atmospheres, particularly thoseincluding the interaction between the escaped material and strong stellarwinds, and have been previously observed at 10830 A, in at least one otherexoplanet. With both the largest mid-transit absorption signal and the mostextended tail observed at 10830 A, WASP-107b remains a keystone exoplanet foratmospheric escape studies.

The post-transit tail of WASP-107b observed at 10830A