Reference : Rotation periods and astrometric motions of the Luhman 16AB brown dwarfs by high-reso...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
http://hdl.handle.net/2268/218197
Rotation periods and astrometric motions of the Luhman 16AB brown dwarfs by high-resolution lucky-imaging monitoring
English
Mancini, L. [Max-Planck Institute for Astronomy, Königstuhl 17, Heidelberg, Germany, INAF-Osservatorio Astrofisico di Torino, via Osservatorio 20, Pino Torinese, Italy]
Giacobbe, P. [INAF-Osservatorio Astrofisico di Torino, via Osservatorio 20, Pino Torinese, Italy]
Littlefair, S. P. [Department of Physics and Astronomy, University of Sheffield, Sheffield, United Kingdom]
Southworth, J. [Astrophysics Group, Keele University, Keele, United Kingdom]
Bozza, V. [Department of Physics, University of Salerno, Via Giovanni Paolo II 132, Fisciano (SA), Italy, Istituto Nazionale di Fisica Nucleare, Sezione di Napoli, Napoli, Italy]
Damasso, M. [INAF-Osservatorio Astrofisico di Torino, via Osservatorio 20, Pino Torinese, Italy]
Dominik, M. [SUPA, University of St.Andrews, School of Physics and Astronomy, North Haugh, St.Andrews, Fife, United Kingdom]
Hundertmark, M. [SUPA, University of St.Andrews, School of Physics and Astronomy, North Haugh, St.Andrews, Fife, United Kingdom]
Jørgensen, U. G. [Niels Bohr Institute, Centre for Star and Planet Formation, University of Copenhagen, Østervoldgade 5, Copenhagen K, Denmark]
Juncher, D. [Niels Bohr Institute, Centre for Star and Planet Formation, University of Copenhagen, Østervoldgade 5, Copenhagen K, Denmark]
Popovas, A. [Niels Bohr Institute, Centre for Star and Planet Formation, University of Copenhagen, Østervoldgade 5, Copenhagen K, Denmark]
Rabus, M. [Max-Planck Institute for Astronomy, Königstuhl 17, Heidelberg, Germany, Instituto de Astrofísica, Pontificia Universidad Católica de Chile, Av. Vicuña Mackenna 4860, Macul, Santiago, Chile]
Rahvar, S. [Department of Physics, Sharif University of Technology, PO Box 11155-9161, Tehran, Iran]
Schmidt, R. W. [Astronomisches Rechen-Institut, Zentrum für Astronomie, Universität Heidelberg, Mönchhofstrasse 12-14, Heidelberg, Germany]
Skottfelt, J. [Niels Bohr Institute, Centre for Star and Planet Formation, University of Copenhagen, Østervoldgade 5, Copenhagen K, Denmark, Centre for Electronic Imaging, Dept. of Physical Sciences, Open University, Milton Keynes, United Kingdom]
Snodgrass, C. [Planetary and Space Sciences, Dept. of Physical Sciences, Open University, Milton Keynes, United Kingdom]
Sozzetti, A. [INAF-Osservatorio Astrofisico di Torino, via Osservatorio 20, Pino Torinese, Italy]
Alsubai, K. [Qatar Environment and Energy Research Institute, Qatar Foundation, Tornado Tower, PO Box 5825, Doha, Qatar]
Bramich, D. M. [Qatar Environment and Energy Research Institute, Qatar Foundation, Tornado Tower, PO Box 5825, Doha, Qatar]
Calchi Novati, S. [Department of Physics, University of Salerno, Via Giovanni Paolo II 132, Fisciano (SA), Italy, NASA Exoplanet Science Institute, MS 100-22, California Institute of Technology, Pasadena, CA, United States, Istituto Internazionale per Gli Alti Studi Scientifici (IIASS), Vietri Sul Mare (SA), Italy]
Ciceri, S. [Max-Planck Institute for Astronomy, Königstuhl 17, Heidelberg, Germany]
D'Ago, G. [Department of Physics, University of Salerno, Via Giovanni Paolo II 132, Fisciano (SA), Italy, Istituto Nazionale di Fisica Nucleare, Sezione di Napoli, Napoli, Italy, Istituto Internazionale per Gli Alti Studi Scientifici (IIASS), Vietri Sul Mare (SA), Italy]
Figuera Jaimes, R. [SUPA, University of St.Andrews, School of Physics and Astronomy, North Haugh, St.Andrews, Fife, United Kingdom, European Southern Observatory, Karl-Schwarzschild-Strasse 2, Garching bei München, Germany]
Galianni, P. [SUPA, University of St.Andrews, School of Physics and Astronomy, North Haugh, St.Andrews, Fife, United Kingdom]
Gu, S.-H. [Yunnan Observatories, Chinese Academy of Sciences, Kunming, China, Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming, China]
Harpsøe, K. [Niels Bohr Institute, Centre for Star and Planet Formation, University of Copenhagen, Østervoldgade 5, Copenhagen K, Denmark]
Haugbølle, T. [Niels Bohr Institute, Centre for Star and Planet Formation, University of Copenhagen, Østervoldgade 5, Copenhagen K, Denmark]
Henning, Th [Max-Planck Institute for Astronomy, Königstuhl 17, Heidelberg, Germany]
Hinse, T. C. [Korea Astronomy and Space Science Institute, Daejeon, South Korea]
Kains, N. [Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD, United States]
Korhonen, H. [Niels Bohr Institute, Centre for Star and Planet Formation, University of Copenhagen, Østervoldgade 5, Copenhagen K, Denmark, Finnish Centre for Astronomy with ESO (FINCA), University of Turku, Väisäläntie 20, Piikkiö, Finland]
Scarpetta, G. [Department of Physics, University of Salerno, Via Giovanni Paolo II 132, Fisciano (SA), Italy, Istituto Nazionale di Fisica Nucleare, Sezione di Napoli, Napoli, Italy, Istituto Internazionale per Gli Alti Studi Scientifici (IIASS), Vietri Sul Mare (SA), Italy]
Starkey, D. [SUPA, University of St.Andrews, School of Physics and Astronomy, North Haugh, St.Andrews, Fife, United Kingdom]
Surdej, Jean mailto [Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Département d'astrophys., géophysique et océanographie (AGO) >]
Wang, X.-B. [Yunnan Observatories, Chinese Academy of Sciences, Kunming, China, Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming, China]
Wertz, O. [Institut d'Astrophysique et de Géophysique, Université de Liège, Liège, Belgium]
2015
Astronomy and Astrophysics
EDP Sciences
584
Yes (verified by ORBi)
International
0004-6361
1432-0746
[en] Binaries: visual ; Brown dwarfs ; Stars: variables: general ; Techniques: image processing ; Techniques: photometric ; Bins ; Image processing ; Photometry ; Rotation ; Binaries: visuals ; Stars
[en] 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. © ESO, 2015.
Researchers ; Professionals
http://hdl.handle.net/2268/218197
10.1051/0004-6361/201526899

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