Search for He I airglow emission from the hot Jupiter τ Boo b Y. Zhang, I. A. G. Snellen, P. Mollière, F. J. Alonso-Floriano, R. K. Webb, M. Brogi and A. Wyttenbach A&A, 641 (2020) A161 Published online: 24 September 2020 DOI: 10.1051/0004-6361/202038412