A second substellar companion in the Gliese 86 system - A brown dwarf in an extrasolar planetary systemS. G. Els, M. F. Sterzik, F. Marchis, E. Pantin, M. Endl and M. KürsterA&A, 370 1 (2001) L1-L4DOI: https://doi.org/10.1051/0004-6361:20010298