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With a spectral type of T10, UGPS J072227.51-054031.2 is one of the coolestobjects known to date in the solar neighborhood. Multiple systems arerelatively common among early and mid-T dwarfs. We search for faint and closecompanions around UGPSJ072227.51-054031.2. We have obtained high spatialresolution images in the H and Ks bands using adaptive optics at the Very LargeTelescope. With a Strehl ratio in the range 10-15%, the final images allow usto rule out the presence of a companion brighter than H<19.4mag at separationlarger than 50mas, and H<21.4mag at separation larger than 0.1".

Adaptive optics observations of the T10 ultracool dwarf UGPSJ072227.51-054031.2