The GAPS Programme with HARPS-N at TNG - III: The retrograde orbit of HAT-P-18b M. Esposito, E. Covino, L. Mancini, A. Harutyunyan, J. Southworth, K. Biazzo, D. Gandolfi, A. F. Lanza, M. Barbieri, A. S. Bonomo et al. (15 more) A&A, 564 (2014) L13 Published online: 14 April 2014 DOI: 10.1051/0004-6361/201423735