OGLE-2017-BLG-1130: The First Binary Gravitational Microlens Detected from Spitzer Only

doi:10.3847/1538-4357/aabcd2

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	OGLE-2017-BLG-1130: The First Binary Gravitational Microlens Detected from Spitzer Only
	Wang,Tianshu 2; Calchi Novati,S.3; Udalski,A.4; Gould,A.1,5,6; Mao,Shude 2,7,8; Zang,W.2; Beichman,C.9; Bryden,G.10; Carey,S.11; Gaudi,B. S.6
刊名	The Astrophysical Journal
	2018-06-07
卷号	860 期号:1
关键词	binaries: general gravitational lensing: micro
ISSN号	0004-637X
DOI	10.3847/1538-4357/aabcd2
英文摘要	Abstract We analyze the binary gravitational microlensing event OGLE-2017-BLG-1130 (mass ratio q?～?0.45), the first published case in which the binary anomaly was detected only by the Spitzer Space Telescope. This event provides strong evidence that some binary signals can be missed by observations from the ground alone but detected by Spitzer. We therefore invert the normal procedure, first finding the lens parameters by fitting the space-based data and then measuring the microlensing parallax using ground-based observations. We also show that the normal four-fold space-based degeneracy in the single-lens case can become a weak eight-fold degeneracy in binary-lens events. Although this degeneracy is resolved in event OGLE-2017-BLG-1130, it might persist in other events.
语种	英语
出版者	The American Astronomical Society
WOS记录号	IOP:0004-637X-860-1-AABCD2
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/21639]
专题	中国科学院国家天文台
作者单位	1.Max-Planck-Institute for Astronomy, K?nigstuhl 17, D-69117 Heidelberg, Germany 2.Physics Department and Tsinghua Centre for Astrophysics, Tsinghua University, Beijing 100084, People's Republic of China 3.IPAC, Mail Code 100-22, Caltech, 1200 E. California Blvd., Pasadena, CA 91125, USA 4.Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland 5.Korea Astronomy and Space Science Institute, Daejon 34055, Republic of Korea 6.Department of Astronomy, Ohio State University, 140 W. 18th Ave., Columbus, OH 43210, USA 7.National Astronomical Observatories, Chinese Academy of Sciences, 20A Datun Rd., Chaoyang District, Beijing 100012, People's Republic of China 8.Jodrell Bank Centre for Astrophysics, School of Physics and Astronomy, The University of Manchester, Oxford Road, Manchester M13 9PL, UK 9.NASA Exoplanet Science Institute, MS 100-22, California Institute of Technology, Pasadena, CA 91125, USA 10.Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Dr., Pasadena, CA 91109, USA
推荐引用方式 GB/T 7714	Wang,Tianshu,Calchi Novati,S.,Udalski,A.,et al. OGLE-2017-BLG-1130: The First Binary Gravitational Microlens Detected from Spitzer Only[J]. The Astrophysical Journal,2018,860(1).
APA	Wang,Tianshu.,Calchi Novati,S..,Udalski,A..,Gould,A..,Mao,Shude.,...&Pogge,R. W..(2018).OGLE-2017-BLG-1130: The First Binary Gravitational Microlens Detected from Spitzer Only.The Astrophysical Journal,860(1).
MLA	Wang,Tianshu,et al."OGLE-2017-BLG-1130: The First Binary Gravitational Microlens Detected from Spitzer Only".The Astrophysical Journal 860.1(2018).