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Rotation periods and astrometric motions of the Luhman 16AB brown dwarfs by high-resolution lucky-imaging monitoring
Mancini, L.1,2; Giacobbe, P.2; Littlefair, S.P.3; Southworth, J.4; Bozza, V.5,6; Damasso, M.2; Dominik, M.7; Hundertmark, M.7; Jørgensen, U.G.8; Juncher, D.8; Popovas, A.8; Rabus, M.1,9; Rahvar, S.10; Schmidt, R.W.11; Skottfelt, J.8,12; Snodgrass, C.13; Sozzetti, A.2; Alsubai, K.14; Bramich, D.M.14; Calchi Novati, S.5,15,16; Ciceri, S.1; D'Ago, G.5,6,16; Figuera Jaimes, R.7,17; Galianni, P.7; Gu SH(顾盛宏)18,19; Harpsøe, K.8; Haugbølle, T.8; Henning, Th.1; Hinse, T.C.20; Kains, N.21; Korhonen, H.8,22; Scarpetta, G.5,6,16; Starkey, D.7; Surdej, J.23; Wang XB(王晓彬)18,19; Wertz, O.23
Source PublicationASTRONOMY & ASTROPHYSICS
2015-12-01
Volume584
DOI10.1051/0004-6361/201526899
Contribution Rank第18完成单位
Indexed BySCI ; EI
Keywordbinaries: visual brown dwarfs stars: variables: general techniques: photometric techniques: image processing
Abstract

Context. Photometric monitoring of the variability of brown dwarfs can provide useful information about the structure of clouds in their cold atmospheres. The brown-dwarf binary system Luhman 16AB is an interesting target for such a study, because its components stand at the L/T transition and show high levels of variability. Luhman 16AB is also the third closest system to the solar system, which allows precise astrometric investigations with ground-based facilities. 

Aims. The aim of the work is to estimate the rotation period and study the astrometric motion of both components. 

Methods. We have monitored Luhman 16AB over a period of two years with the lucky-imaging camera mounted on the Danish 1.54m telescope at La Silla, through a special i + z long-pass filter, which allowed us to clearly resolve the two brown dwarfs into single objects. An intense monitoring of the target was also performed over 16 nights, in which we observed a peak-to-peak variability of 0 : 20 +/- 0 : 02 mag and 0 : 34 +/- 0 : 02 mag for Luhman 16A and 16B, respectively. 

Results. We used the 16-night time-series data to estimate the rotation period of the two components. We found that Luhman 16B rotates with a period of 5 : 1 +/- 0 : 1 h, in very good agreement with previous measurements. For Luhman 16A, we report that it rotates more slowly than its companion, and even though we were not able to get a robust determination, our data indicate a rotation period of roughly 8 h. This implies that the rotation axes of the two components are well aligned and suggests a scenario in which the two objects underwent the same accretion process. The 2-year complete data set was used to study the astrometric motion of Luhman 16AB. We predict a motion of the system that is not consistent with a previous estimate based on two months of monitoring, but cannot confirm or refute the presence of additional planetary-mass bodies in the system.

Funding ProjectDanish Natural Science Research Council (FNU) ; STFC ; Communaute francaise de Belgique - Actions de recherche concertees - Academie Wallonie-Europe ; National Natural Science Foundation of China [10873031] ; National Natural Science Foundation of China [11473066] ; Villum Foundation
Funding OrganizationDanish Natural Science Research Council (FNU) ; STFC ; Communaute francaise de Belgique - Actions de recherche concertees - Academie Wallonie-Europe ; National Natural Science Foundation of China [10873031, 11473066] ; Villum Foundation
Language英语
Subject Area天文学 ; 天体物理学 ; 实测天体物理学 ; 恒星与银河系 ; 恒星天文学
MOST Discipline Catalogue理学 ; 理学::天文学
SubtypeArticle
PublisherEDP SCIENCES S A
Publication Place17, AVE DU HOGGAR, PA COURTABOEUF, BP 112, F-91944 LES ULIS CEDEX A, FRANCE
ISSN0004-6361
URL查看原文
WOS IDWOS:000366936800104
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordT-DWARFS ; WISE J104915.57-531906.1 ; EVOLVING WEATHER ; VARIABLE-STARS ; I. DETECTION ; 2 PC ; TRANSITION ; VARIABILITY ; PHOTOMETRY ; BINARY
EI Accession Number20155001664500
EI KeywordsRotation
EI Classification Number657.2Extraterrestrial Physics and Stellar Phenomena - 931.1Mechanics - 941.4Optical Variables Measurements
Citation statistics
Cited Times:5[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/6805
Collection系外行星研究组
中国科学院天体结构与演化重点实验室
Corresponding AuthorMancini, L.
Affiliation1.Max-Planck Institute for Astronomy, Königstuhl 17, 69117 Heidelberg, Germany
2.INAF–Osservatorio Astrofisico di Torino, via Osservatorio 20, 10025 Pino Torinese, Italy
3.Department of Physics and Astronomy, University of Sheffield, Sheffield S3 7RH, UK
4.Astrophysics Group, Keele University, Keele, United Kingdom
5.Department of Physics, University of Salerno, Via Giovanni Paolo II 132, 84084 Fisciano (SA), Italy
6.Istituto Nazionale di Fisica Nucleare, Sezione di Napoli, 80126 Napoli, Italy
7.SUPA, University of St Andrews, School of Physics & Astronomy, North Haugh, St Andrews, Fife KY16 9SS, UK
8.Niels Bohr Institute, Centre for Star and Planet Formation, University of Copenhagen, Østervoldgade 5, Copenhagen K, Denmark
9.Instituto de Astrofísica, Pontificia Universidad Católica de Chile, Av. Vicuña Mackenna 4860, Macul, Santiago, Chile
10.Department of Physics, Sharif University of Technology, PO Box 11155-9161, Tehran, Iran
11.Astronomisches Rechen-Institut, Zentrum für Astronomie, Universität Heidelberg, Mönchhofstrasse 12-14, Heidelberg, Germany
12.Centre for Electronic Imaging, Dept. of Physical Sciences, Open University, Milton Keynes, United Kingdom
13.Planetary and Space Sciences, Dept. of Physical Sciences, Open University, Milton Keynes, United Kingdom
14.Qatar Environment and Energy Research Institute, Qatar Foundation, Tornado Tower, PO Box 5825, Doha, Qatar
15.NASA Exoplanet Science Institute, MS 100-22, California Institute of Technology, Pasadena
16.Istituto Internazionale per gli Alti Studi Scientifici (IIASS), 84019 Vietri Sul Mare (SA), Italy
17.European Southern Observatory, Karl-Schwarzschild-Strasse 2, 85748 Garching bei München, Germany
18.Yunnan Observatories, Chinese Academy of Sciences, 650011 Kunming, PR China
19.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, 650011 Kunming, PR China
20.Korea Astronomy and Space Science Institute, 305-348 Daejeon, Republic of Korea
21.Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA
22.Finnish Centre for Astronomy with ESO (FINCA), University of Turku, Väisäläntie 20, 21500 Piikkiö, Finland
23.Institut d’Astrophysique et de Géophysique, Université de Liège, 4000 Liège, Belgium
Recommended Citation
GB/T 7714
Mancini, L.,Giacobbe, P.,Littlefair, S.P.,et al. Rotation periods and astrometric motions of the Luhman 16AB brown dwarfs by high-resolution lucky-imaging monitoring[J]. ASTRONOMY & ASTROPHYSICS,2015,584.
APA Mancini, L..,Giacobbe, P..,Littlefair, S.P..,Southworth, J..,Bozza, V..,...&Wertz, O..(2015).Rotation periods and astrometric motions of the Luhman 16AB brown dwarfs by high-resolution lucky-imaging monitoring.ASTRONOMY & ASTROPHYSICS,584.
MLA Mancini, L.,et al."Rotation periods and astrometric motions of the Luhman 16AB brown dwarfs by high-resolution lucky-imaging monitoring".ASTRONOMY & ASTROPHYSICS 584(2015).
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