Journal ArticleConstraints on Metastable Helium in the Atmospheres of WASP-69b and WASP-52b with Ultranarrowband PhotometryVissapragada, Shreyas; Knutson, Heather A.; Jovanovic, Nemanja; Harada, Caleb K.; Oklopčić, Antonija; Eriksen, James; Mawet, Dimitri; Millar-Blanchaer, Maxwell A.; Tinyanont, Samaporn; Vasisht, Gautamnull2020-06-0110250322The Astronomical Journal15962781538-3881https://doi.org/10.3847/1538-3881/ab8e341852268National Science Foundation