5 Radial velocity variations

The analysis of UVES spectra taken at different times yielded to the detection of significant RV variations for five out of nine bona fide and candidate brown dwarfs in ChaI. They could be caused by motion of the brown dwarf due to an orbiting companion or by magnetically induced surface features. The detected RV variations are of the order of 1kms^-1. If they are caused by an orbiting object this would have a mass of a few Jupiter masses depending on the orbital parameters (Joergens et al. 2001). More details will be given later after additional follow-up observations.