| Issue |
A&A
Volume 567, July 2014
|
|
|---|---|---|
| Article Number | A43 | |
| Number of page(s) | 4 | |
| Section | Stellar structure and evolution | |
| DOI | https://doi.org/10.1051/0004-6361/201424070 | |
| Published online | 08 July 2014 | |
Research Note
WISEA J064750.85-154616.4: a new nearby L/T transition dwarf⋆
Leibniz-Institut für Astrophysik Potsdam (AIP),
An der Sternwarte 16,
14482
Potsdam,
Germany
e-mail: rdscholz@aip.de; gbihain@aip.de; jstorm@aip.de
Received:
25
April
2014
Accepted:
4
June
2014
Aims. Our aim is to detect and classify previously overlooked brown dwarfs in the solar neighbourhood.
Methods. We performed a proper motion search among bright sources observed with the Wide-field Infrared Survey Explorer (WISE) that are also seen in the Two Micron All Sky Survey (2MASS). Our candidates appear according to their red J−Ks colours as nearby late-L dwarf candidates. Low-resolution near-infrared (NIR) classification spectroscopy in the HK band allowed us to get spectroscopic distance and tangential velocity estimates.
Results. We have discovered a new L9.5 dwarf, WISEA J064750.85-154616.4, at a spectroscopic distance of about 14 pc and with a tangential velocity of about 11 km s-1, typical of the Galactic thin disc population. We have confirmed another recently found L/T transition object at about 10 pc, WISEA J140533.13+835030.7, which we classified as L8 (NIR).
Key words: astrometry / proper motions / stars: distances / stars: kinematics and dynamics / brown dwarfs / solar neighborhood
© ESO, 2014
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