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OGLE-2014-BLG-0289: Precise Characterization of a Quintuple-peak Gravitational Microlensing Event

Udalski, A. and Beichman, C. and Carey, S. and Calchi Novati, S. (2018) OGLE-2014-BLG-0289: Precise Characterization of a Quintuple-peak Gravitational Microlensing Event. Astrophysical Journal, 853 (1). Art. No. 70. ISSN 0004-637X. doi:10.3847/1538-4357/aaa295.

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We present the analysis of the binary-microlensing event OGLE-2014-BLG-0289. The event light curve exhibits five very unusual peaks, four of which were produced by caustic crossings and the other by a cusp approach. It is found that the quintuple-peak features of the light curve provide tight constraints on the source trajectory, enabling us to precisely and accurately measure the microlensing parallax π_E. Furthermore, the three resolved caustics allow us to measure the angular Einstein radius θ_E. From the combination of π_E and θ_E, the physical lens parameters are uniquely determined. It is found that the lens is a binary composed of two M dwarfs with masses M_1 = 0.52 ± 0.04 M_⊙ and M_2 = 0.42 ± 0.03 M_⊙ separated in projection by α_⊥ = 6.4 ± 0.5 au. The lens is located in the disk with a distance of D_L = 3.3 ± 0.3 kpc. The reason for the absence of a lensing signal in the Spitzer data is that the time of observation corresponds to the flat region of the light curve.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Udalski, A.0000-0001-5207-5619
Beichman, C.0000-0002-5627-5471
Carey, S.0000-0002-0221-6871
Calchi Novati, S.0000-0002-7669-1069
Additional Information:© 2018 American Astronomical Society. Received 2017 November 10. Accepted 2017 December 11. Published 2018 January 24. Work by C. Han was supported by the grant (2017R1A4A1015178) of National Research Foundation of Korea. The OGLE project has received funding from the National Science Centre, Poland, grant MAESTRO 2014/14/A/ST9/00121 to A. Udalski. OGLE Team thanks Profs. M. Kubiak and G. Pietrzyński for their contribution to the OGLE photometric data set presented in this paper. The MOA project is supported by JSPS KAKENHI grant Nos. JSPS24253004, JSPS26247023, JSPS23340064, JSPS15H00781, and JP16H06287. Work by A. Gould was supported by JPL grant 1500811. Work by J. C. Yee was performed in part under contract with the California Institute of Technology (Caltech)/Jet Propulsion Laboratory (JPL) funded by NASA through the Sagan Fellowship Program executed by the NASA Exoplanet Science Institute. We acknowledge the high-speed internet service (KREONET) provided by Korea Institute of Science and Technology Information (KISTI). Software: OGLE pipeline (Woźniak 2000; Udalski 2003), MOA pipeline (Bond et al. 2001), the DANDIA pipeline (Bramich 2008), pySIS (Albrow et al. 2009), DoPHOT (Schechter et al. 1993).
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
National Research Foundation of Korea2017R1A4A1015178
National Science Centre (Poland)MAESTRO 2014/14/A/ST9/00121
Japan Society for the Promotion of Science (JSPS)JSPS24253004
Japan Society for the Promotion of Science (JSPS)JSPS26247023
Japan Society for the Promotion of Science (JSPS)JSPS23340064
Japan Society for the Promotion of Science (JSPS)JSPS15H00781
Japan Society for the Promotion of Science (JSPS)JP16H06287
Subject Keywords:binaries: general; gravitational lensing: micro
Issue or Number:1
Record Number:CaltechAUTHORS:20180131-143212435
Persistent URL:
Official Citation:A. Udalski et al 2018 ApJ 853 70
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:84608
Deposited By: Ruth Sustaita
Deposited On:31 Jan 2018 23:09
Last Modified:22 Nov 2022 20:52

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