Ground-based Parallax Confirmed by Spitzer: Binary Microlensing Event MOA-2015-BLG-020

doi:10.3847/1538-4357/aa813b

	Ground-based Parallax Confirmed by Spitzer: Binary Microlensing Event MOA-2015-BLG-020
	Pietrukowicz, P.42; Pawlak, M.42; Mroz, P.42; Kozlowski, S.42; Yonehara, A.16; Yamada, T.16; Tristram, P. J.39; Suzuki, D.4,40; Sullivan, D. J.30; Shibai, H.43
刊名	ASTROPHYSICAL JOURNAL
	2017-08-20
卷号	845 期号:2
关键词	Binaries: General Galaxy: Bulge Gravitational Lensing: Micro
DOI	10.3847/1538-4357/aa813b
文献子类	Article
英文摘要	We present the analysis of the binary gravitational microlensing event MOA-2015-BLG-020. The event has a fairly long timescale (similar to 63 days) and thus the light curve deviates significantly from the lensing model that is based on the rectilinear lens-source relative motion. This enables us to measure the microlensing parallax through the annual parallax effect. The microlensing parallax parameters constrained by the ground-based data are confirmed by the Spitzer observations through the satellite parallax method. By additionally measuring the angular Einstein radius from the analysis of the resolved caustic crossing, the physical parameters of the lens are determined. It is found that the binary lens is composed of two dwarf stars with masses M-1= 0.606 +/- 0.028M(circle dot) and M-2= 0.125 +/- 0.006 M-circle dot in the Galactic disk. Assuming that the source star is at the same distance as the bulge red clump stars, we find the lens is at a distance D-L = 2.44 +/- 0.10 kpc. We also provide a summary and short discussion of all of the published microlensing events in which the annual parallax effect is confirmed by other independent observations.
WOS关键词	GRAVITATIONAL LENSING EXPERIMENT ; JUPITER/SATURN ANALOG ; PLANETARY SYSTEMS ; DISTANCES ; ALGORITHM ; NETWORK ; MASSES ; STARS
WOS研究方向	Astronomy & Astrophysics
语种	英语
WOS记录号	WOS:000408111400015
资助机构	National Natural Science Foundation of China (NSFC)(11333003 ; National Natural Science Foundation of China (NSFC)(11333003 ; Strategic Priority Research Program "The Emergence of Cosmological Structures"(XDB09000000) ; Strategic Priority Research Program "The Emergence of Cosmological Structures"(XDB09000000) ; National Astronomical Observatories ; National Astronomical Observatories ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Special Fund for Astronomy from the Ministry of Finance ; Special Fund for Astronomy from the Ministry of Finance ; US NSF(AST-1516842) ; US NSF(AST-1516842) ; JPL(1500811) ; JPL(1500811) ; NASA through the Sagan Fellowship Program ; NASA through the Sagan Fellowship Program ; National Science Centre, Poland(MAESTRO 2014/14/A/ST9/00121) ; National Science Centre, Poland(MAESTRO 2014/14/A/ST9/00121) ; National Research Foundation of Korea(2017R1A4A1015178) ; National Research Foundation of Korea(2017R1A4A1015178) ; JSPS KAKENHI(JSPS24253004 ; JSPS KAKENHI(JSPS24253004 ; 11390372) ; 11390372) ; JSPS26247023 ; JSPS26247023 ; JSPS23340064 ; JSPS23340064 ; JSPS15H00781 ; JSPS15H00781 ; JP16H06287) ; JP16H06287) ; National Natural Science Foundation of China (NSFC)(11333003 ; National Natural Science Foundation of China (NSFC)(11333003 ; Strategic Priority Research Program "The Emergence of Cosmological Structures"(XDB09000000) ; Strategic Priority Research Program "The Emergence of Cosmological Structures"(XDB09000000) ; National Astronomical Observatories ; National Astronomical Observatories ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Special Fund for Astronomy from the Ministry of Finance ; Special Fund for Astronomy from the Ministry of Finance ; US NSF(AST-1516842) ; US NSF(AST-1516842) ; JPL(1500811) ; JPL(1500811) ; NASA through the Sagan Fellowship Program ; NASA through the Sagan Fellowship Program ; National Science Centre, Poland(MAESTRO 2014/14/A/ST9/00121) ; National Science Centre, Poland(MAESTRO 2014/14/A/ST9/00121) ; National Research Foundation of Korea(2017R1A4A1015178) ; National Research Foundation of Korea(2017R1A4A1015178) ; JSPS KAKENHI(JSPS24253004 ; JSPS KAKENHI(JSPS24253004 ; 11390372) ; 11390372) ; JSPS26247023 ; JSPS26247023 ; JSPS23340064 ; JSPS23340064 ; JSPS15H00781 ; JSPS15H00781 ; JP16H06287) ; JP16H06287)
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/20129]
专题	国家天文台_星系宇宙学研究部
作者单位	1.Chungbuk Natl Univ, Dept Phys, Cheongju 361763, South Korea 2.Smithsonian Astrophys Observ, 60 Garden St, Cambridge, MA 02138 USA 3.Sorbonne Univ, UPMC, Univ Paris 06, CNRS,UMR 7095,Inst Astrophys Paris, 98 Bis Bd Arago, F-75014 Paris, France 4.NASA, Goddard Space Flight Ctr, Code 667, Greenbelt, MD 20771 USA 5.Ist Int Alti Sci IIASS, Via G Pellegrino 19, I-84019 Vietri Sul Mare, SA, Italy 6.Univ Salerno, Dipartimento Fis ER Caianiello, Via Giovanni Paolo II, I-84084 Fisciano, SA, Italy 7.Osaka Univ, Grad Sch Sci, Dept Earth & Space Sci, Toyonaka, Osaka 5600043, Japan 8.Univ Warsaw Observ, AI Ujazdowskie 4, PL-00478 Warsaw, Poland 9.Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany 10.Korea Astron & Space Sci Inst, 776 Daedeokdae Ro, Yusung Gu 34055, Daejeon, South Korea
推荐引用方式 GB/T 7714	Pietrukowicz, P.,Pawlak, M.,Mroz, P.,et al. Ground-based Parallax Confirmed by Spitzer: Binary Microlensing Event MOA-2015-BLG-020[J]. ASTROPHYSICAL JOURNAL,2017,845(2).
APA	Pietrukowicz, P..,Pawlak, M..,Mroz, P..,Kozlowski, S..,Yonehara, A..,...&Fausnaugh, M..(2017).Ground-based Parallax Confirmed by Spitzer: Binary Microlensing Event MOA-2015-BLG-020.ASTROPHYSICAL JOURNAL,845(2).
MLA	Pietrukowicz, P.,et al."Ground-based Parallax Confirmed by Spitzer: Binary Microlensing Event MOA-2015-BLG-020".ASTROPHYSICAL JOURNAL 845.2(2017).