| Issue |
A&A
Volume 526, February 2011
|
|
|---|---|---|
| Article Number | A55 | |
| Number of page(s) | 3 | |
| Section | Stellar structure and evolution | |
| DOI | https://doi.org/10.1051/0004-6361/201015289 | |
| Published online | 21 December 2010 | |
Research Note
Adaptive optics observations of the T10 ultracool dwarf UGPS J072227.51-054031.2⋆
1
Centro de Astrobiología, INTA-CSIC, PO Box 78, 28691
Villanueva de la Cañada,
Madrid,
Spain
e-mail: hbouy@cab.inta-csic.es
2
European Southern Observatory, Alonso de Cordova 3107, Vitacura, Casilla 19001,
Santiago 19,
Chile
3
Centre for Astrophysics, STRI, University of Hertfordshire,
College Lane,
Hatfield
AL10 9AB,
UK
Received:
28
June
2010
Accepted:
17
August
2010
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 Ks 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.
Key words: binaries: general / brown dwarfs / techniques: high angular resolution
© ESO, 2010
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