Measurement of Source Star Colors with the K2C9-CFHT Multi-color Microlensing Survey

doi:10.1088/1538-3873/aadcd3

CORC > 国家天文台 > 中国科学院国家天文台

	Measurement of Source Star Colors with the K2C9-CFHT Multi-color Microlensing Survey
	Zang, Weicheng 2,3,4; Penny, Matthew T.5; Zhu, Wei 5,6; Mao, Shude 2,3,7,8; Fouque, Pascal 1,9; Udalski, Andrzej 10; Hwang, Kyu-Ha 11; Wang, Tianshu 2,3; Huang, Chelsea 12,13,14,15; Boyajian, Tabetha. S.16
刊名	PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC
	2018-10-01
卷号	130 期号:992 页码:16
关键词	gravitational lensing: micro planets and satellites: detection surveys
ISSN号	0004-6280
DOI	10.1088/1538-3873/aadcd3
英文摘要	Microlensing events observed from locations separated by similar to au have different peak times and peak magnifications due to microlensing parallax. K2 Campaign 9 (K2C9) was the first space-based microlensing parallax survey capable of measuring microlensing parallaxes of free-floating planet candidate microlensing events. Simultaneous to K2C9 observations we conducted the K2C9 Canada-France-Hawaii Telescope Multi-Color Microlensing Survey (K2C9-CFHT MCMS) in order to measure the colors of microlensing source stars to improve the accuracy of K2C9's parallax measurements. We describe the difference imaging photometry analysis of the K2C9-CFHT MCMS observations, and present the project's first data release. This includes instrumental difference flux light curves in up to three filters (g, r, and i) of 217 microlensing events identified by other microlensing surveys, reference image photometry of more than 30 million point sources calibrated to PanSTARRS data release 1 photometry with an absolute accuracy better than 0.02. mag. We derive accurate analytic transformations between the PanSTARRS bandpasses and the Kepler bandpass, as well as color-surface brightness relations in the PanSTARRS bandpasses. To demonstrate the use of our data set, we analyze ground-based and K2 data of a short timescale microlensing event, OGLE-2016-BLG-0795. We find the event has a timescale t(E) = 4.5 +/- 0.1 days and microlens parallax pi(E) = 0.09 +/- 0.03 or 0.91 +/- 0.04, subject to the standard satellite parallax degeneracy. We argue that the smaller value of the parallax is more likely, which implies that the lens is likely a stellar-mass object in the Galactic bulge as opposed to a super-Jupiter mass object in the Galactic disk.
资助项目	National Astronomical Observatories of China ; Chinese Academy of Sciences (the Strategic Priority Research Program "The Emergence of Cosmological Structures")[XDB09000000] ; Special Fund for Astronomy from the Ministry of Finance ; National Science Foundation of China[11333003] ; National Science Foundation of China[11390372] ; NASA through the Sagan Fellowship Program ; NASA[NNX16AC62G] ; NASA[NNG16PJ32C] ; National Science Centre, Poland[MAESTRO 2014/14/A/ST9/00121] ; KASI grant[2017-1-830-03] ; National Aeronautics and Space Administration[NNX08AR22G] ; National Science Foundation[AST-1238877]
WOS关键词	FREE-FLOATING PLANETS ; GRAVITATIONAL LENSING EXPERIMENT ; IMAGE SUBTRACTION ; GALACTIC BULGE ; PHOTOMETRY ; PARALLAX ; CATALOG ; EVENT ; PREDICTIONS ; MAGNITUDES
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	IOP PUBLISHING LTD
WOS记录号	WOS:000444697900001
资助机构	National Astronomical Observatories of China ; National Astronomical Observatories of China ; Chinese Academy of Sciences (the Strategic Priority Research Program "The Emergence of Cosmological Structures") ; Chinese Academy of Sciences (the Strategic Priority Research Program "The Emergence of Cosmological Structures") ; Special Fund for Astronomy from the Ministry of Finance ; Special Fund for Astronomy from the Ministry of Finance ; National Science Foundation of China ; National Science Foundation of China ; NASA through the Sagan Fellowship Program ; NASA through the Sagan Fellowship Program ; NASA ; NASA ; National Science Centre, Poland ; National Science Centre, Poland ; KASI grant ; KASI grant ; National Aeronautics and Space Administration ; National Aeronautics and Space Administration ; National Science Foundation ; National Science Foundation ; National Astronomical Observatories of China ; National Astronomical Observatories of China ; Chinese Academy of Sciences (the Strategic Priority Research Program "The Emergence of Cosmological Structures") ; Chinese Academy of Sciences (the Strategic Priority Research Program "The Emergence of Cosmological Structures") ; Special Fund for Astronomy from the Ministry of Finance ; Special Fund for Astronomy from the Ministry of Finance ; National Science Foundation of China ; National Science Foundation of China ; NASA through the Sagan Fellowship Program ; NASA through the Sagan Fellowship Program ; NASA ; NASA ; National Science Centre, Poland ; National Science Centre, Poland ; KASI grant ; KASI grant ; National Aeronautics and Space Administration ; National Aeronautics and Space Administration ; National Science Foundation ; National Science Foundation ; National Astronomical Observatories of China ; National Astronomical Observatories of China ; Chinese Academy of Sciences (the Strategic Priority Research Program "The Emergence of Cosmological Structures") ; Chinese Academy of Sciences (the Strategic Priority Research Program "The Emergence of Cosmological Structures") ; Special Fund for Astronomy from the Ministry of Finance ; Special Fund for Astronomy from the Ministry of Finance ; National Science Foundation of China ; National Science Foundation of China ; NASA through the Sagan Fellowship Program ; NASA through the Sagan Fellowship Program ; NASA ; NASA ; National Science Centre, Poland ; National Science Centre, Poland ; KASI grant ; KASI grant ; National Aeronautics and Space Administration ; National Aeronautics and Space Administration ; National Science Foundation ; National Science Foundation ; National Astronomical Observatories of China ; National Astronomical Observatories of China ; Chinese Academy of Sciences (the Strategic Priority Research Program "The Emergence of Cosmological Structures") ; Chinese Academy of Sciences (the Strategic Priority Research Program "The Emergence of Cosmological Structures") ; Special Fund for Astronomy from the Ministry of Finance ; Special Fund for Astronomy from the Ministry of Finance ; National Science Foundation of China ; National Science Foundation of China ; NASA through the Sagan Fellowship Program ; NASA through the Sagan Fellowship Program ; NASA ; NASA ; National Science Centre, Poland ; National Science Centre, Poland ; KASI grant ; KASI grant ; National Aeronautics and Space Administration ; National Aeronautics and Space Administration ; National Science Foundation ; National Science Foundation
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/22740]
专题	中国科学院国家天文台
通讯作者	Zang, Weicheng
作者单位	1.CFHT Corp, 65-1238 Mamalahoa Hwy, Kamuela, HI 96743 USA 2.Tsinghua Univ, Phys Dept, Beijing 100084, Peoples R China 3.Tsinghua Univ, Tsinghua Ctr Astrophys, Beijing 100084, Peoples R China 4.Zhejiang Univ, Dept Phys, Hangzhou 310058, Zhejiang, Peoples R China 5.Ohio State Univ, Dept Astron, 140 W 18th Ave, Columbus, OH 43210 USA 6.Univ Toronto, Canadian Inst Theoret Astrophys, 60 St George St, Toronto, ON M5S 3H8, Canada 7.Chinese Acad Sci, Natl Astron Observ, A20 Datun Rd, Beijing 100012, Peoples R China 8.Univ Manchester, Jodrell Bank Ctr Astrophys, Alan Turing Bldg, Manchester M13 9PL, Lancs, England 9.Univ Toulouse, UPS OMP, IRAP, Toulouse, France 10.Univ Warsaw Observ, Al Ujazdowskie 4, PL-00478 Warsaw, Poland
推荐引用方式 GB/T 7714	Zang, Weicheng,Penny, Matthew T.,Zhu, Wei,et al. Measurement of Source Star Colors with the K2C9-CFHT Multi-color Microlensing Survey[J]. PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC,2018,130(992):16.
APA	Zang, Weicheng.,Penny, Matthew T..,Zhu, Wei.,Mao, Shude.,Fouque, Pascal.,...&Barentsen, Geert.(2018).Measurement of Source Star Colors with the K2C9-CFHT Multi-color Microlensing Survey.PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC,130(992),16.
MLA	Zang, Weicheng,et al."Measurement of Source Star Colors with the K2C9-CFHT Multi-color Microlensing Survey".PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC 130.992(2018):16.