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

Abstract

With a spectral type of T10, UGPS J072227.51-054031.2 is one of the coolest objects known to date in the solar neighborhood. Multiple systems are relatively common among early and mid-T dwarfs. We search for faint and close companions around UGPSJ072227.51-054031.2. We have obtained high spatial resolution images in the H and Ks bands using adaptive optics at the Very Large Telescope. 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<19.4mag at separation larger than 50mas, and H<21.4mag at separation larger than 0.1".

Research Note, accepted for publication in A&A

References in corpus (5)

• The UKIRT Infrared Deep Sky Survey (UKIDSS)
• A very cool brown dwarf in UKIDSS DR1
• The discovery of a very cool, very nearby brown dwarf in the Galactic plane
• Exploring the substellar temperature regime down to ~550K
• Finding ultracool brown dwarfs with MegaCam on CFHT: method and first results

Cited by in corpus (1)

• The Hawaii Infrared Parallax Program. I. Ultracool Binaries and the L/T Transition