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We report the discovery of a 16-20 Jupiter mass radial velocity companionaround the very young (3 Myr) brown dwarf candidate ChaHa8. Based onhigh-resolution echelle spectra of ChaHa8 taken between 2000 and 2007 with UVESat the VLT, a companion was detected through RV variability with asemi-amplitude of 1.6 km/s. A Kepler fit to the data yields an orbital periodof the companion of 1590 days and an eccentricity of e=0.49. A companionminimum mass M2sin i between 16 and 20 Jupiter masses is derived when usingmodel-dependent mass estimates for the primary. The mass ratio M2/M1 might beas small as 0.2 and, with a probability of 87%, it is less than 0.4. ChaHa8harbors most certainly the lowest mass companion detected so far in a close (~1AU) orbit around a brown dwarf or very low-mass star. From the uncertainty inthe orbit solution, it cannot completely be ruled out that the companion has amass in the planetary regime. Its discovery is in any case an important steptowards RV planet detections around BDs. Further, ChaHa8 is the fourth knownspectroscopic brown dwarf or very low-mass binary system with an RV orbitsolution and the second known very young one.

Discovery of 18 Jupiter mass RV companion orbiting the brown dwarf candidate ChaHa8