Ground-based photometry of the 21-day Neptune HD 106315c M. Lendl, D. Ehrenreich, O. D. Turner, D. Bayliss, S. Blanco-Cuaresma, H. Giles, F. Bouchy, M. Marmier and S. Udry A&A, 603 (2017) L5 Published online: 13 July 2017 DOI: 10.1051/0004-6361/201731278