Adaptive optics observations of the T10 ultracool dwarf UGPS J072227.51-054031.2

Context. With a spectral type of T10, UGPS J072227.51-054031.2 is one of the coolest objects known to date in the solar neighborhood.
Aims: Multiple systems are relatively common among early and mid-T dwarfs. We search for faint and close companions around UGPS J072227.51-054031.2.
Methods: We have obtained high spatial resolution images in the H and K_s bands using adaptive optics at the Very Large Telescope.
Results: With a Strehl ratio in the range 10-15%, the final images allow us to rule out the presence of a companion brighter than H ⪉ 19.4 mag at separation larger than 50 mas, and H ⪉ 21.4 mag at separation larger than 0.1 arcsec.

Based on observations obtained with the ESO Telescopes at the Paranal Observatory under program 285.C-5004.