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Characterization of the nearby L/T Binary Brown Dwarf WISE J104915.57–531906.1 at 2 Pc from the Sun

Kniazev, A. Y. and Vaisanen, P. and Mužic, K. and Mehner, A. and Boffin, H. M. J. and Kurtev, R. and Melo, C. and Ivanov, V. D. and Girard, J. and Mawet, D. and Schmidtobreick, L. and Huélamo, N. and Borissova, J. and Minniti, D. and Ishibashi, K. and Potter, S. B. and Beletsky, Y. and Buckley, D. A. H. and Crawford, S. and Gulbis, A. A. S. and Kotze, P. and Miszalski, B. and Pickering, T. E. and Romero Colmenero, E. and Williams, T. B. (2013) Characterization of the nearby L/T Binary Brown Dwarf WISE J104915.57–531906.1 at 2 Pc from the Sun. Astrophysical Journal, 770 (2). Art. No. 124. ISSN 0004-637X. https://resolver.caltech.edu/CaltechAUTHORS:20150528-123635645

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Abstract

WISE J104915.57–531906.1 is a L/T brown dwarf binary located 2 pc from the Sun. The pair contains the closest known brown dwarfs and is the third closest known system, stellar or sub-stellar. We report comprehensive follow-up observations of this newly uncovered system. We have determined the spectral types of both components (L8 ± 1, for the primary, agreeing with the discovery paper; T1.5 ± 2 for the secondary, which was lacking spectroscopic type determination in the discovery paper) and, for the first time, their radial velocities (V_(rad) ~ 23.1, 19.5 km s^(–1)) using optical spectra obtained at the Southern African Large Telescope and other facilities located at the South African Astronomical Observatory (SAAO). The relative radial velocity of the two components is smaller than the range of orbital velocities for theoretically predicted masses, implying that they form a gravitationally bound system. We report resolved near-infrared JHK_S photometry from the Infrared Survey Facility telescope at the SAAO which yields colors consistent with the spectroscopically derived spectral types. The available kinematic and photometric information excludes the possibility that the object belongs to any of the known nearby young moving groups or associations. Simultaneous optical polarimetry observations taken at the SAAO 1.9 m give a non-detection with an upper limit of 0.07%. For the given spectral types and absolute magnitudes, 1 Gyr theoretical models predict masses of 0.04-0.05 M _☉ for the primary, and 0.03-0.05 M _☉ for the secondary.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1088/0004-637X/770/2/124DOIArticle
http://iopscience.iop.org/0004-637X/770/2/124/PublisherArticle
http://arxiv.org/abs/1303.7171arXivArticle
ORCID:
AuthorORCID
Mehner, A.0000-0002-9564-3302
Mawet, D.0000-0002-8895-4735
Huélamo, N.0000-0002-2711-8143
Borissova, J.0000-0002-5936-7718
Minniti, D.0000-0002-7064-099X
Additional Information:© 2013 The American Astronomical Society. Received 2013 March 28; Accepted 2013 May 2; Published 2013 June 4. Some observations reported in this paper were obtained with the Southern African Large Telescope (SALT). All SAAO and SALT co-authors acknowledge the support from the National Research Foundation (NRF) of South Africa. This research has benefited from the MLTY dwarf compendium at http://DwarfArchives.org. We thank Adam Burgasser for making some template spectra available to us and the anonymous referee for the suggestions that helped to greatly improve the paper. R.K. and J.B. acknowledge partial support from FONDECYT through grant Nos. 1130140 and 1120601, respectively. D.M. is supported by BASAL CATA PFB-06 and FONDECYT No. 1130196.
Funders:
Funding AgencyGrant Number
National Research Foundation of South AfricaUNSPECIFIED
Fondo Nacional de Desarrollo Científico y Tecnológico (FONDECYT)1130140
Fondo Nacional de Desarrollo Científico y Tecnológico (FONDECYT)1120601
El Centro de Astrofísica y Tecnologías Afines' (CATA)PFB-06
Fondo Nacional de Desarrollo Científico y Tecnológico (FONDECYT)1130196
Subject Keywords:brown dwarfs; infrared: stars; solar neighborhood; stars: individual (G 171-22, HD 55383, WISE J104915.57-531906.1); stars: low-mass
Issue or Number:2
Record Number:CaltechAUTHORS:20150528-123635645
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20150528-123635645
Official Citation:Characterization of the nearby L/T Binary Brown Dwarf WISE J104915.57–531906.1 at 2 Pc from the Sun. A. Y. Kniazev et al. 2013 ApJ 770 124
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:57879
Collection:CaltechAUTHORS
Deposited By: Joanne McCole
Deposited On:29 May 2015 20:17
Last Modified:11 Oct 2019 20:41

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