Constraints on Metastable Helium in the Atmospheres of WASP-69b and WASP-52b with Ultra-Narrowband Photometry

Shreyas Vissapragada, Heather A. Knutson, Nemanja Jovanovic +7

Infrared observations of metastable 2${}^3$S helium absorption with ground- and space-based spectroscopy are rapidly maturing, as this species is a unique probe of exoplanet atmosphe…