Adaptive optics observations of the T10 ultracool dwarf UGPS J072227.51-054031.2 H. Bouy, J. H. V. Girard, E. L. Martín, N. Huélamo and P. W. Lucas A&A, 526 (2011) A55 Published online: 21 December 2010 DOI: 10.1051/0004-6361/201015289