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OGLE-2016-BLG-0156: Microlensing Event with Pronounced Microlens-parallax Effects Yielding a Precise Lens Mass Measurement

Jung, Youn Kil and Shvartzvald, Yossi (2019) OGLE-2016-BLG-0156: Microlensing Event with Pronounced Microlens-parallax Effects Yielding a Precise Lens Mass Measurement. Astrophysical Journal, 872 (2). Art. No. 175. ISSN 1538-4357. https://resolver.caltech.edu/CaltechAUTHORS:20190220-084913750

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Abstract

We analyze the gravitational binary-lensing event OGLE-2016-BLG-0156, for which the lensing light curve displays pronounced deviations induced by microlens-parallax effects. The light curve exhibits three distinctive widely separated peaks and we find that the multiple-peak feature provides a very tight constraint on the microlens-parallax effect, enabling us to precisely measure the microlens parallax π_E. All the peaks are densely and continuously covered from high-cadence survey observations using globally located telescopes and the analysis of the peaks leads to the precise measurement of the angular Einstein radius θ_E. From the combination of the measured π_E and θ_E, we determine the physical parameters of the lens. It is found that the lens is a binary composed of two M dwarfs with masses M_1 = 0.18 ± 0.01 M⊙ and M_2 = 0.16 ± 0.01 M⊙ located at a distance D_L = 1.35 ± 0.09 kpc. According to the estimated lens mass and distance, the flux from the lens comprises an important fraction, ~25%, of the blended flux. The bright nature of the lens combined with the high relative lens-source motion, μ = 6.94 ± 0.50 mas yr^(−1), suggests that the lens can be directly observed from future high-resolution follow-up observations.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.3847/1538-4357/ab001fDOIArticle
https://iopscience.iop.org/article/10.3847/1538-4357/ab001fPublisherArticle
https://arxiv.org/abs/1901.06457arXivDiscussion Paper
ORCID:
AuthorORCID
Jung, Youn Kil0000-0002-0314-6000
Shvartzvald, Yossi0000-0003-1525-5041
Additional Information:© 2019 The American Astronomical Society. Received 2018 November 11; revised 2019 January 15; accepted 2019 January 18; published 2019 February 20. Work by C.H. was supported by the grant (2017R1A4A1015178) of National Research Foundation of Korea. Work by A.G. was supported by US NSF grant AST-1516842. Work by I.G.S. and A.G. was supported by JPL grant 1500811. A.G. received support from the European Research Council under the European Union's Seventh Framework Programme (FP 7) ERC Grant Agreement No. [321035]. The MOA project is supported by JSPS KAKENHI grant Nos. JSPS24253004, JSPS26247023, JSPS23340064, JSPS15H00781, and JP16H06287. Y.M. acknowledges the support by grant JP14002006. D.P.B., A.B., and C.R. were supported by NASA through grant NASA-80NSSC18K0274. The work by C.R. was supported by an appointment to the NASA Postdoctoral Program at the Goddard Space Flight Center, administered by USRA through a contract with NASA. N.J.R. is a Royal Society of New Zealand Rutherford Discovery Fellow. The OGLE project has received funding from the National Science Centre, Poland, grant MAESTRO 2014/14/A/ST9/00121 to A.U. This research has made use of the KMTNet system operated by the Korea Astronomy and Space Science Institute (KASI) and the data were obtained at three host sites of CTIO in Chile, SAAO in South Africa, and SSO in Australia. We acknowledge the high-speed internet service (KREONET) provided by the Korea Institute of Science and Technology Information (KISTI).
Group:Infrared Processing and Analysis Center (IPAC)
Funders:
Funding AgencyGrant Number
National Research Foundation of Korea2017R1A4A1015178
NSFAST-1516842
JPL1500811
European Research Council (ERC)321035
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
Japan Society for the Promotion of Science (JSPS)JP14002006
NASA80NSSC18K0274
NASA Postdoctoral ProgramUNSPECIFIED
Royal SocietyUNSPECIFIED
National Science Centre (Poland)MAESTRO 2014/14/A/ST9/00121
Subject Keywords:binaries: general – gravitational lensing: micro
Issue or Number:2
Record Number:CaltechAUTHORS:20190220-084913750
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20190220-084913750
Official Citation:Youn Kil Jung et al 2019 ApJ 872 175
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:92996
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:20 Feb 2019 18:27
Last Modified:03 Oct 2019 20:50

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