A very low mass T dwarf binary

Keck Laser Guide Star Adaptive Optics Monitoring of 2MASS J1534-2952AB: First Dynamical Mass Determination of a Binary T Dwarf

Each object is below 30 Jupiter masses. Orbital period is 4 years and average seoaration 2.3 AUs.
Young aged (0.78- Gyr) and relatively hot (<10^-4.5 L_Sun).
T_eff1=1028 K and T_eff1=978 K.
There are radii too: R₁=0.98 Rj and R₂= 0.993 Rj (a bit bloated secondary?)

Water zone around 0.0056 AUs (i.e 5.6x10^-3 AUs)? Brrr....