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

文献类型：期刊论文

作者Zang, Weicheng2,3,4; Penny, Matthew T.5; Zhu, Wei5,6; Mao, Shude2,3,7,8; Fouque, Pascal1,9; Udalski, Andrzej10; Hwang, Kyu-Ha11; Wang, Tianshu2,3; Huang, Chelsea12,13,14,15; Boyajian, Tabetha. S.16
刊名PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC
出版日期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
DOI10.1088/1538-3873/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.
WOS关键词FREE-FLOATING PLANETS ; GRAVITATIONAL LENSING EXPERIMENT ; IMAGE SUBTRACTION ; GALACTIC BULGE ; PHOTOMETRY ; PARALLAX ; CATALOG ; EVENT ; PREDICTIONS ; MAGNITUDES
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研究方向Astronomy & Astrophysics
语种英语
WOS记录号WOS:000444697900001
出版者IOP PUBLISHING LTD
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
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.

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