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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
发表期刊ASTRONOMY & ASTROPHYSICS
2015-12-01
卷号584
DOI10.1051/0004-6361/201526899
产权排序第18完成单位
收录类别SCI ; EI
摘要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 1.54 m 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.
语种英语
学科领域Astronomy & Astrophysics
文章类型Article
ISSN0004-6361
URL查看原文
WOS记录号WOS:000366936800104
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]T-DWARFS ; WISE J104915.57-531906.1 ; EVOLVING WEATHER ; VARIABLE-STARS ; I. DETECTION ; 2 PC ; TRANSITION ; VARIABILITY ; PHOTOMETRY ; BINARY
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文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/6805
专题系外行星研究组
中国科学院天体结构与演化重点实验室
作者单位1.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
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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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