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Binaries provide empirical key constraints for star formation theories, likethe overall binary fraction, mass ratio distribution and the separationdistribution. They play a crucial role to calibrate the output of theoreticalmodels, like absolute magnitudes, colors and effective temperature depending onmass, metallicity and age. We present first results of our on-goinghigh-resolution imaging survey of late type brown dwarfs. The survey aims atresolving tight brown dwarf binary systems to better constrain the T dwarfbinary fraction. We intent to follow-up the individual binaries to determineorbital parameters. Using NACO at the VLT we performed AO-assistednear-infrared observations of SDSS J2052-1609. High-spatial resolution imagesof the T1 dwarf were obtained in H and Ks filters. We resolved SDSS J2052-1609into a binary system with a separation of 0.101" \pm 0.001". Archival data fromHST/NICMOS taken one year previous to our observations proves the components tobe co-moving. Using the flux ratio between the components we infer J, H and Ksmagnitudes for the resolved system. From the near-IR colors we estimatespectral types of T1 +1 -4 and T2.5 \pm 1 for component A and B, respectively.A first estimate of the total system mass yields Mtot > 78 Mjup, assuming acircular orbit.

Resolving the L/T transition binary SDSS J2052-1609 AB