A multi-site campaign to detect the transit of the second planet in HAT-P-13 Gy. M. Szabó, L. L. Kiss, J. M. Benkő, Gy. Mező, J. Nuspl, Zs. Regály, K. Sárneczky, A. E. Simon, G. Leto, R. Zanmar Sanchez et al. (3 more) A&A, 523 (2010) A84 Published online: 18 November 2010 DOI: 10.1051/0004-6361/201015172