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A Focus on L Dwarfs with Trigonometric Parallaxes

文献类型：期刊论文

作者Wang, Y.1; Smart, R. L.2,3; Shao, Z.4,5; Jones, H. R. A.3; Marocco, F.3; Luo, A.1; Burgasser, A.6; Zhong, J.4; Du, B.1
刊名PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC
出版日期2018-06-01
卷号130期号:988页码:9
关键词parallaxes proper motions (stars:) brown dwarfs
ISSN号0004-6280
DOI10.1088/1538-3873/aaacc5
英文摘要We report new parallax measurements for 10 L-and early T-type dwarfs, five of which have no previous published values, using observations over 3 years at the robotic Liverpool Telescope. The resulting parallaxes and proper motions have median errors of 2 mas and 1.5 mas/year, respectively. Their space motions indicate they are all Galactic disk members. We combined this sample with other objects with astrometry from the Liverpool Telescope and with the published literature astrometry to construct a sample of 260 L- and early T type dwarfs with measured parallaxes, designated the Astrometry Sample. We study the kinematics of the Astrometry Sample, and derived a solar motion of (U, V, W)(circle dot) =. (7.9 +/- 1.7, 13.2 +/- 1.2, 7.2 +/- 1.0) km s(-1), with respect to the local standard of rest, in agreement with the recent literature. We derive a kinematic age of 1.5-1.7 Gyr for the Astrometry Sample assuming the age increases monotonically with the total velocity for a given disk sample. This kinematic age is less than half of the literature values for which used the same methods and similar but different low-mass dwarf samples. We believe this difference arises for two reasons: (1) the sample is mainly composed of mid to late L dwarfs, which are expected to be relatively young, and (2) the requirement that objects have a measured parallax biases the sample to the brighter examples, which tend to be younger.
WOS关键词ALL-SKY SURVEY ; T-DWARFS ; PROPER MOTIONS ; BROWN DWARF ; SOLAR NEIGHBORHOOD ; LOCAL STANDARD ; SPACE DENSITY ; DARK-MATTER ; FIELD L ; KINEMATICS
资助项目IPERCOOL[247593] ; PARSEC International Fellowship within the Marie Curie 7th European Community Framework Programme[236735] ; Leverhulme Trust[VP1-2015-063] ; NSFC[11233004] ; NSFC[11390373] ; NSFC[11503066] ; UK's Science and Technology Facilities Council[ST/M001008/1] ; Shanghai Natural Science Foundation[14ZR1446900] ; UK Science and Technology Facilities Council
WOS研究方向Astronomy & Astrophysics
语种英语
WOS记录号WOS:000432339700001
出版者IOP PUBLISHING LTD
资助机构IPERCOOL ; IPERCOOL ; PARSEC International Fellowship within the Marie Curie 7th European Community Framework Programme ; PARSEC International Fellowship within the Marie Curie 7th European Community Framework Programme ; Leverhulme Trust ; Leverhulme Trust ; NSFC ; NSFC ; UK's Science and Technology Facilities Council ; UK's Science and Technology Facilities Council ; Shanghai Natural Science Foundation ; Shanghai Natural Science Foundation ; UK Science and Technology Facilities Council ; UK Science and Technology Facilities Council ; IPERCOOL ; IPERCOOL ; PARSEC International Fellowship within the Marie Curie 7th European Community Framework Programme ; PARSEC International Fellowship within the Marie Curie 7th European Community Framework Programme ; Leverhulme Trust ; Leverhulme Trust ; NSFC ; NSFC ; UK's Science and Technology Facilities Council ; UK's Science and Technology Facilities Council ; Shanghai Natural Science Foundation ; Shanghai Natural Science Foundation ; UK Science and Technology Facilities Council ; UK Science and Technology Facilities Council ; IPERCOOL ; IPERCOOL ; PARSEC International Fellowship within the Marie Curie 7th European Community Framework Programme ; PARSEC International Fellowship within the Marie Curie 7th European Community Framework Programme ; Leverhulme Trust ; Leverhulme Trust ; NSFC ; NSFC ; UK's Science and Technology Facilities Council ; UK's Science and Technology Facilities Council ; Shanghai Natural Science Foundation ; Shanghai Natural Science Foundation ; UK Science and Technology Facilities Council ; UK Science and Technology Facilities Council ; IPERCOOL ; IPERCOOL ; PARSEC International Fellowship within the Marie Curie 7th European Community Framework Programme ; PARSEC International Fellowship within the Marie Curie 7th European Community Framework Programme ; Leverhulme Trust ; Leverhulme Trust ; NSFC ; NSFC ; UK's Science and Technology Facilities Council ; UK's Science and Technology Facilities Council ; Shanghai Natural Science Foundation ; Shanghai Natural Science Foundation ; UK Science and Technology Facilities Council ; UK Science and Technology Facilities Council
源URL[http://ir.bao.ac.cn/handle/114a11/21732]  
专题中国科学院国家天文台
通讯作者Wang, Y.
作者单位1.Chinese Acad Sci, Natl Astron Observ China, 20A Datun Rd Chaoyang Dist, Beijing, Peoples R China
2.Osservatorio Astrofis Torino, Ist Nazl Astrofis, Str Osservatorio 20, I-10025 Pino Torinese, Italy
3.Univ Hertfordshire, Sch Phys Astron & Math, Coll Lane, Hatfield AL10 9AB, Herts, England
4.Chinese Acad Sci, Shanghai Astron Observ, 80 Nandan Rd, Shanghai 200030, Peoples R China
5.Key Lab Astrophys, Shanghai 200234, Peoples R China
6.Univ Calif San Diego, Ctr Astrophys & Space Sci, La Jolla, CA 92093 USA
推荐引用方式
GB/T 7714		 Wang, Y.,Smart, R. L.,Shao, Z.,et al. A Focus on L Dwarfs with Trigonometric Parallaxes[J]. PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC,2018,130(988):9.
APA Wang, Y..,Smart, R. L..,Shao, Z..,Jones, H. R. A..,Marocco, F..,...&Du, B..(2018).A Focus on L Dwarfs with Trigonometric Parallaxes.PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC,130(988),9.
MLA Wang, Y.,et al."A Focus on L Dwarfs with Trigonometric Parallaxes".PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC 130.988(2018):9.

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