| Discovery of the first wide L dwarf plus giant binary system and eight other ultracool dwarfs in wide binaries | |
Zhang, ZH1; Pinfield, DJ1; Day-Jones, AC1,2; Burningham, B1; Jones, HRA1; Yu, S3; Jenkins, JS2; Han ZW(韩占文)4,5 ; Galvez-Ortiz, MC1; Gallardo, J2; Garcia-Perez, AE1,6; Weights, D1; Tinney, CG7; R. S. Pokorny4,5; Zhang, ZH (reprint author), Univ Hertfordshire, Sci & Technol Res Inst, Ctr Astrophys Res, Hatfield AL10 9AB, Herts, England.
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| 发表期刊 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
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| 2010-06-01 | |
| 卷号 | 404期号:4页码:1817-1834 |
| DOI | 10.1111/j.1365-2966.2010.16394.x |
| 产权排序 | 第4完成单位 |
| 收录类别 | SCI |
| 关键词 | Binaries: General Brown Dwarfs Stars: Individual: Eta Cancri Stars: Late-type Stars: Low-mass |
| 摘要 | We identify 806 ultracool dwarfs (of which 34 are newly discovered L dwarfs) from their Sloan Digital Sky Survey (SDSS) riz photometry and obtain proper motions through cross-matching with the United Kingdom Infrared Telescope Infrared Deep Sky Survey (UKIDSS) and Two-Micron All-Sky Survey (2MASS). Proper-motion and distance constraints show that nine of our ultracool dwarfs are members of widely separated binary systems: SDSS 0101 (K5V+M9.5V), SDSS 0207 (M1.5V+L3V), SDSS 0832 (K3III+L3.5V), SDSS 0858 (M4V+L0V), SDSS 0953 (M4V+M9.5V), SDSS 0956 (M2V+M9V), SDSS 1304 (M4.5V+L0V), SDSS 1631 (M5.5V+M8V) and SDSS 1638 (M4V+L0V). One of these (SDSS 0832) is shown to be a companion to the bright K3 giant eta Cancri. Such primaries can provide age and metallicity constraints for any companion objects, yielding excellent benchmark objects. eta Cancri AB is the first wide ultracool dwarf + giant binary system identified. We present new observations and analysis that constrain the metallicity of eta Cancri A to be near-solar, and use recent evolutionary models to constrain the age of the giant to be 2.2-6.1 Gyr. If eta Cancri B is a single object, we estimate its physical attributes to be mass = 63-82 M(Jup), T(eff) = 1800 +/- 150 K, log g = 5.3-5.5, [M/H] = 0.0 +/- 0.1. Its colours are non-typical when compared with other ultracool dwarfs, and we also assess the possibility that eta Cancri B is itself an unresolved binary, showing that the combined light of an L4 + T4 system could provide a reasonable explanation for its colours. |
| 项目资助者 | Alfred P. Sloan Foundation ; National Science Foundation ; US Department of Energy ; National Aeronautics and Space Administration ; Japanese Monbukagakusho ; Max Planck Society ; Higher Education Funding Council for England ; American Museum of Natural History ; Astrophysical Institute Potsdam ; University of Basel ; University of Cambridge ; Case Western Reserve University ; University of Chicago ; Drexel University ; Fermilab ; Institute for Advanced Study ; Japan Participation Group ; Johns Hopkins University ; Joint Institute for Nuclear Astrophysics ; Kavli Institute for Particle Astrophysics and Cosmology ; Korean Scientist Group ; Chinese Academy of Sciences (LAMOST) ; Los Alamos National Laboratory ; Max-Planck-Institute for Astronomy (MPIA) ; Max-Planck-Institute for Astrophysics (MPA) ; New Mexico State University ; Ohio State University ; University of Pittsburgh ; University of Portsmouth ; Princeton University ; United States Naval Observatory ; University of Washington ; UK Science and Technology Facilities Council ; NSFC [10821061] ; ARC [DP774000] |
| 语种 | 英语 |
| 学科领域 | Astronomy & Astrophysics |
| 文章类型 | Article |
| ISSN | 0035-8711 |
| URL | 查看原文 |
| WOS记录号 | WOS:000277981400014 |
| WOS研究方向 | Astronomy & Astrophysics |
| WOS类目 | Astronomy & Astrophysics |
| 关键词[WOS] | DIGITAL SKY SURVEY ; STAR ADAPTIVE OPTICS ; LOW-MASS STARS ; PROPER-MOTION CATALOG ; BROWN DWARF ; T-DWARF ; DATA RELEASE ; SUBSTELLAR COMPANION ; NEARBY STARS ; SOLAR NEIGHBORHOOD |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.ynao.ac.cn/handle/114a53/4501 |
| 专题 | 大样本恒星演化研究组 中国科学院天体结构与演化重点实验室 |
| 通讯作者 | Zhang, ZH (reprint author), Univ Hertfordshire, Sci & Technol Res Inst, Ctr Astrophys Res, Hatfield AL10 9AB, Herts, England. |
| 作者单位 | 1.Centre for Astrophysics Research, Science and Technology Research Institute, University of Hertfordshrie, Hatfield AL10 9AB 2.Department of Astronomy, Universidad de Chile, Casilla Postal 36D, Santiago, Chile 3.Armagh Observatory, College Hill, Armagh BT61 9DG 4.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, Kunming 650011, China 5.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences 6.Department of Astronomy, University of Virginia, PO Box 400325, Charlottesville, VA 22904-4325, USA 7.School of Physics, University of New South Wales, NSW 2050, Australia |
| 推荐引用方式 GB/T 7714 | Zhang, ZH,Pinfield, DJ,Day-Jones, AC,et al. Discovery of the first wide L dwarf plus giant binary system and eight other ultracool dwarfs in wide binaries[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2010,404(4):1817-1834. |
| APA | Zhang, ZH.,Pinfield, DJ.,Day-Jones, AC.,Burningham, B.,Jones, HRA.,...&Zhang, ZH .(2010).Discovery of the first wide L dwarf plus giant binary system and eight other ultracool dwarfs in wide binaries.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,404(4),1817-1834. |
| MLA | Zhang, ZH,et al."Discovery of the first wide L dwarf plus giant binary system and eight other ultracool dwarfs in wide binaries".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 404.4(2010):1817-1834. |
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