The cool brown dwarf Gliese 229 B is a close binary
Brandt, M. et al. Improved dynamical masses for six brown dwarf companions using Hipparcos and Gaia EDR3. Astron. J. 162, 301 (2021). ADSĀ Google ScholarĀ Cheetham, A. et al. Direct imaging of an ultracool substellar companion to the exoplanet host star HD …