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Three new late-type hypervelocity star candidates from Gaia DR2 with refined selection criteria
Li J(李蛟)1,2,3,4; Jia, Shi1,2,5; Gao Y(高沿)1,2,3,4; Jiang DK(姜登凯)1,2,4; Kupfer, Thomas6,7; Heber, Ulrich8; Liu, Chao9; Chen XF(陈雪飞)1,2,4; Han ZW(韩占文)1,2,3,4
Source PublicationRESEARCH IN ASTRONOMY AND ASTROPHYSICS
2020-03-01
Volume20Issue:3Pages:15
DOI10.1088/1674-4527/20/3/42
Contribution Rank第1完成单位
Indexed BySCI ; CSCD
Keywordkinematics and dynamics evolution statistics
Abstract

Several dozen hypervelocity star (HVS) candidates have been reported based on the second data release of Gaia (Gaia DR2). However, it has been proven that the radial velocities of some Gaia HVS candidates are not reliable. In this paper, we employ refined astrometric criteria to re-examine Gaia DR2, arriving at a more reliable sample of HVS and high velocity star candidates than those found by previous authors. We develop a method called Binary Escape Probability Analysis to identify some HVS candidates. This method allows us to work with stars having only two epochs of measured radial velocity. These stars were usually discarded in previous similar studies. A scrutiny of our final results sheds light on selection effects present in our studies, which we propose to be the focus of future studies. In total, we find three late-type (2 G-type and 1 K-type) HVS and 21 high velocity star candidates, 3 and 11 of which are new, respectively. Judging by their historical trajectories, which we calculate, all three HVS candidates could not have had Galactic center origins. Further monitoring is required to confirm their status.

Funding ProjectNatural Natural Science Foundation of China (NSFC)[11521303] ; Natural Natural Science Foundation of China (NSFC)[11573061] ; Natural Natural Science Foundation of China (NSFC)[11733008] ; Natural Natural Science Foundation of China (NSFC)[11661161016] ; Yunnan province[2015FB190] ; Science and Technology Development Fund, Macau SAR[001/2016/AFJ] ; Science and Technology Development Fund, Macau SAR[0001/2019/A1] ; NSFC[11333003] ; NSFC[11390372]
Funding OrganizationNatural Natural Science Foundation of China (NSFC)[11521303, 11573061, 11733008, 11661161016] ; Yunnan province[2015FB190] ; Science and Technology Development Fund, Macau SAR[001/2016/AFJ, 0001/2019/A1] ; NSFC[11333003] ; NSFC[11390372]
Language英语
Subject Area天文学 ; 恒星与银河系 ; 恒星形成与演化
MOST Discipline Catalogue理学 ; 理学::天文学
SubtypeArticle
PublisherNATL ASTRONOMICAL OBSERVATORIES, CHIN ACAD SCIENCES
Publication Place20A DATUN RD, CHAOYANG, BEIJING, 100012, PEOPLES R CHINA
ISSN1674-4527
URL查看原文
WOS IDWOS:000526826000001
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordWHITE-DWARFS ; KINEMATICS ; ORIGIN ; MASS ; VELOCITIES ; BINARIES
CSCD IDCSCD:6721344
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/23030
Collection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
Corresponding AuthorLi J(李蛟)
Affiliation1.Yunnan observatories, Chinese Academy of Sciences, Kunming 650011, China
2.Key Laboratory for the Structure and Evolution of Celestial Objects, Yunnan observatories, Chinese Academy of Sciences, Kunming 650011, China
3.University of Chinese Academy of Sciences, Beijing 100049, China
4.Center for Astronomical Mega-Science, Chinese Academy of Sciences, Beijing 100101, China
5.State Key Laboratory of Lunar and Planetary Sciences, Macau University of Science and Technology,Macau, China
6.Kavli Institute for Theoretical Physics, University of California, Santa Barbara, CA 93106, USA
7.Department of Physics, University of California, Santa Barbara, CA 93106, USA
8.Dr. Remeis-Sternwarte & ECAP, University of Erlangen-Nürnberg, Erlangen, Germany
9.Key Lab of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101, China
First Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Corresponding Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Li J,Jia, Shi,Gao Y,et al. Three new late-type hypervelocity star candidates from Gaia DR2 with refined selection criteria[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2020,20(3):15.
APA Li J.,Jia, Shi.,Gao Y.,Jiang DK.,Kupfer, Thomas.,...&Han ZW.(2020).Three new late-type hypervelocity star candidates from Gaia DR2 with refined selection criteria.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,20(3),15.
MLA Li J,et al."Three new late-type hypervelocity star candidates from Gaia DR2 with refined selection criteria".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 20.3(2020):15.
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