Fast-evolving weather for the coolest of our two new substellar neighbours M. Gillon, A. H. M. J. Triaud, E. Jehin, L. Delrez, C. Opitom, P. Magain, M. Lendl and D. Queloz A&A, 555 (2013) L5 Published online: 09 July 2013 DOI: 10.1051/0004-6361/201321620