Rotation periods and astrometric motions of the Luhman 16AB brown dwarfs by high-resolution lucky-imaging monitoring
文献类型：期刊论文
| 作者 | 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 |
| 刊名 | ASTRONOMY & ASTROPHYSICS
 |
| 出版日期 | 2015-12-01 |
| 卷号 | 584 |
| ISSN号 | 0004-6361 |
| 产权排序 | 第十八完成单位 |
| 英文摘要 | 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. |
| 学科主题 | Astronomy & Astrophysics |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | 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 |
| 收录类别 | SCI ; EI |
| 原文出处 | http://www.aanda.org/articles/aa/abs/2015/12/aa26899-15/aa26899-15.html |
| 语种 | 英语 |
| WOS记录号 | WOS:000366936800104 |
| 源URL | [http://ir.ynao.ac.cn/handle/114a53/6805]  |
| 专题 | 云南天文台_系外行星研究组 云南天文台_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 |
| 推荐引用方式 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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来源：云南天文台
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