HD 17156b: a transiting planet with a 21.2-day period and an eccentric orbit M. Barbieri, R. Alonso, G. Laughlin, J. M. Almenara, R. Bissinger, D. Davies, D. Gasparri, E. Guido, C. Lopresti, F. Manzini and G. Sostero A&A, 476 2 (2007) L13-L16 Published online: 06 November 2007 DOI: 10.1051/0004-6361:20078787