Narrow band Hα photometry of the super-Earth GJ 1214b with GTC/OSIRIS tunable filters F. Murgas, E. Pallé, A. Cabrera-Lavers, K. D. Colón, E. L. Martín and H. Parviainen A&A, 544 (2012) A41 Published online: 24 July 2012 DOI: 10.1051/0004-6361/201219380