A Focus on L Dwarfs with Trigonometric Parallaxes

doi:10.1088/1538-3873/aaacc5

CORC > 国家天文台 > 中国科学院国家天文台

	A Focus on L Dwarfs with Trigonometric Parallaxes
	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
	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
DOI	10.1088/1538-3873/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.
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关键词	ALL-SKY SURVEY ; T-DWARFS ; PROPER MOTIONS ; BROWN DWARF ; SOLAR NEIGHBORHOOD ; LOCAL STANDARD ; SPACE DENSITY ; DARK-MATTER ; FIELD L ; KINEMATICS
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	IOP PUBLISHING LTD
WOS记录号	WOS:000432339700001
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
内容类型	期刊论文
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.