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OGLE-2014-BLG-0962 and a Comparison of Galactic Model Priors to Microlensing Data

Shan, Yutong and Yee, Jennifer C. and Udalski, Andrzej and Bond, Ian A. and Shvartzvald, Yossi and Shin, In-Gu and Jung, Youn-Kil and Calchi Novati, Sebastiano and Beichman, Charles A. and Carey, Sean and Gaudi, B. Scott and Gould, Andrew and Pogge, Richard W. and Poleski, Radosław and Skowron, Jan and Kozłowski, Szymon and Mróz, Przemysław and Pietrukowicz, Paweł and Szymański, Michał K. and Soszyński, Igor and Ulaczyk, Krzysztof and Wyrzykowski, Łukasz and Abe, Fumio and Barry, Richard K. and Bennett, David P. and Bhattacharya, Aparna and Donachie, Martin and Fukui, Akihiko and Hirao, Yuki and Itow, Yoshitaka and Kawasaki, Kohei and Kondo, Iona and Koshimoto, Naoki and Li, Man Cheung Alex and Matsubara, Yutaka and Muraki, Yasushi and Miyazaki, Shota and Nagakane, Masayuki and Ranc, Clément and Rattenbury, Nicholas J. and Suematsu, Haruno and Sullivan, Denis J. and Sumi, Takahiro and Suzuki, Daisuke and Tristram, Paul J. and Yonehara, Atsunori and Maoz, Dan and Kaspi, Shai and Friedmann, Matan (2019) OGLE-2014-BLG-0962 and a Comparison of Galactic Model Priors to Microlensing Data. Astrophysical Journal, 873 (1). Art. No. 30. ISSN 1538-4357.

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OGLE-2014-BLG-0962 (OB140962) is a stellar binary microlensing event that was well covered by observations from the Spitzer satellite as well as ground-based surveys. Modeling yields a unique physical solution: a mid-M+M-dwarf binary with M_(prim) = 0.20 ± 0.01 M☉ and M_(sec) = 0.16 ± 0.01 M☉, with projected separation of 2.0 ± 0.3 au. The lens is only D_(LS) = 0.41 ± 0.06 kpc in front of the source, making OB140962 a bulge lens and the most distant Spitzer binary lens to date. In contrast, because the Einstein radius (θ_E = 0.143 ± 0.007 mas) is unusually small, a standard Bayesian analysis, conducted in the absence of parallax information, would predict a brown dwarf binary. We compare the results of Bayesian analysis using two commonly used Galactic model priors to the measured values for a set of Spitzer lenses. We find all models tested predict lens properties consistent with the Spitzer data. Furthermore, we illustrate the methodology for probing the Galactic distribution of planets by comparing the cumulative distance distribution of the Spitzer two-body lenses to that of the Spitzer single lenses.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Calchi Novati, Sebastiano0000-0002-7669-1069
Beichman, Charles A.0000-0002-5627-5471
Carey, Sean0000-0002-0221-6871
Gaudi, B. Scott0000-0003-0395-9869
Pogge, Richard W.0000-0003-1435-3053
Alternate Title:OGLE-2014-BLG-0962 and the First Statistical Validation of Bayesian Priors for Galactic Microlensing
Additional Information:© 2019 The American Astronomical Society. Received 2018 May 23; revised 2019 January 15; accepted 2019 January 17; published 2019 February 28. The authors would like to thank John Johnson, Jason Eastman, and other members of the Exolab for providing helpful suggestions and feedback throughout the course of this work. We are grateful to Vinay Kashyap for his statistical guidance. We thank Wei Zhu for contributing the data for the Spitzer single-lens CDF (Figure 12 of Zhu et al. 2017) and for discussions. Y. Shan is supported in part by a Doctoral Postgraduate Scholarship from the Natural Science and Engineering Research Council (NSERC) of Canada. The OGLE project has received funding from the National Science Centre, Poland, grant MAESTRO 2014/14/A/ST9/00121 to A.U. The OGLE Team thanks Profs. M. Kubiak and G. Pietrzyński for their contribution to the OGLE photometric data set. The MOA project is supported by JSPS KAKENHI grant Nos. JSPS24253004, JSPS26247023, JSPS23340064, JSPS15H00781, and JP16H06287. This research was supported by the I-CORE program of the Planning and Budgeting Committee and the Israel Science Foundation, grant 1829/12. D.M. and A.G. acknowledge support by the U.S.–Israel Binational Science Foundation.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Natural Sciences and Engineering Research Council of Canada (NSERC)UNSPECIFIED
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
I-CORE Program of the Planning and Budgeting CommitteeUNSPECIFIED
Israel Science Foundation1829/12
Binational Science Foundation (USA-Israel)UNSPECIFIED
Subject Keywords:binaries: general – Galaxy: bulge – gravitational lensing: micro – methods: statistical – stars: low-mass
Issue or Number:1
Record Number:CaltechAUTHORS:20190124-122631813
Persistent URL:
Official Citation:Yutong Shan et al 2019 ApJ 873 30
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:92466
Deposited By: George Porter
Deposited On:25 Jan 2019 18:41
Last Modified:24 Feb 2020 10:30

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