Article (Scientific journals)
Luhman 16AB: A Remarkable, Variable L/T Transition Binary 2 pc from the Sun
Burgasser, A. J.; Faherty, J.; Beletsky, Y. et al.
2013In Memorie della Società Astronomica Italiana: Journal of the Italian Astronomical Society
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Keywords :
Astrophysics - Solar and Stellar Astrophysics
Abstract :
[en] Luhman (2013) has reported the discovery of a brown dwarf binary system only 2.01±0.15 pc from the Sun. The binary is well-resolved with a projected separation of 1farcs 5, and spectroscopic observations have identified the components as late-L and early-T dwarfs. The system exhibits several remarkable traits, including a ``flux reversal'', where the T dwarf is brighter over 0.9-1.3 mu m but fainter at other wavelengths; and significant (˜10%) short-period (˜4.9 hr) photometric variability with a complex light curve. These observations suggest spatial variations in condensate cloud structure, which is known to evolve substantially across the L dwarf/T dwarf transition. Here we report preliminary results from a multi-site monitoring campaign aimed at probing the spectral and temporal properties of this source. Focusing on our spectroscopic observations, we report the first detections of NIR spectral variability, present detailed analysis of K I lines that confirm differences in condensate opacity between the components; and preliminary determinations of radial and rotational velocities based on high-resolution NIR spectroscopy.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Burgasser, A. J.
Faherty, J.
Beletsky, Y.
Plavchan, P.
Gillon, Michaël  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa)
Radigan, J.
Jehin, Emmanuel  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa)
Delrez, Laetitia ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa)
Opitom, Cyrielle ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa)
Morrell, N.
Osten, R.
Street, R.
Melis, C.
Triaud, A.
Simcoe, R.
More authors (5 more) Less
Language :
English
Title :
Luhman 16AB: A Remarkable, Variable L/T Transition Binary 2 pc from the Sun
Publication date :
2013
Journal title :
Memorie della Società Astronomica Italiana: Journal of the Italian Astronomical Society
ISSN :
0037-8720
Publisher :
Società Astronomica Italiana, Milano, Italy
Peer reviewed :
Peer reviewed
Commentary :
eprintid: arXiv:1307.6916
Available on ORBi :
since 11 October 2013

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