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OGLE-2014-BLG-1112LB: A Microlensing Brown Dwarf Detected through the Channel of a Gravitational Binary-lens Event

Han, C. and Udalski, A. and Bozza, V. and Szymański, M. K. and Soszyński, I. and Skowron, J. and Mróz, P. and Poleski, R. and Pietrukowicz, P. and Kozłowski, S. and Ulaczyk, K. and Wyrzykowski, Ł. and Calchi Novati, S. and D’Ago, G. and Dominik, M. and Hundertmark, M. and Jorgensen, U. G. and Scarpetta, G. (2017) OGLE-2014-BLG-1112LB: A Microlensing Brown Dwarf Detected through the Channel of a Gravitational Binary-lens Event. Astrophysical Journal, 843 (2). Art. No. 87. ISSN 1538-4357.

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Due to the nature of the gravitational field, microlensing, in principle, provides an important tool for detecting faint and even dark brown dwarfs. However, the number of identified brown dwarfs is limited due to the difficulty of the lens mass measurement that is needed to check the substellar nature of the lensing object. In this work, we report a microlensing brown dwarf discovered from an analysis of the gravitational binary-lens event OGLE-2014-BLG-1112. We identify the brown dwarf nature of the lens companion by measuring the lens mass from the detections of both microlens-parallax and finite-source effects. We find that the companion has a mass of 3.03 ± 0.78) x 10^)-2) M_⊙ and it is orbiting a solar-type primary star with a mass of 1.07 ± 0.28 M_⊙. The estimated projected separation between the lens components is 9.63 ± 1.33 au and the distance to the lens is 4.84 ± 0.67 kpc. We discuss the usefulness of space-based microlensing observations for detecting brown dwarfs through the channel of binary-lens events.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Udalski, A.0000-0001-5207-5619
Bozza, V.0000-0003-4590-0136
Skowron, J.0000-0002-2335-1730
Mróz, P.0000-0001-7016-1692
Poleski, R.0000-0002-9245-6368
Pietrukowicz, P.0000-0002-2339-5899
Ulaczyk, K.0000-0001-6364-408X
Calchi Novati, S.0000-0002-7669-1069
Dominik, M.0000-0002-3202-0343
Additional Information:© 2017. The American Astronomical Society. Received 2017 March 31. Accepted 2017 May 29. Published 2017 July 6. Work by C. Han was supported by the grant 2017R1A4A1015178 of the 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. The OGLE Team thanks professors M. Kubiak and G. Pietrzyński, former members of the OGLE team, for their contribution to the collection of the OGLE photometric data over the past years. 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)
Funding AgencyGrant Number
National Research Foundation of Korea2017R1A4A1015178
National Science Centre (Poland)MAESTRO 2014/14/A/ST9/00121
Subject Keywords:binaries: general; brown dwarfs; gravitational lensing: micro
Issue or Number:2
Record Number:CaltechAUTHORS:20170707-090506209
Persistent URL:
Official Citation:C. Han et al 2017 ApJ 843 87
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:78834
Deposited By: Ruth Sustaita
Deposited On:07 Jul 2017 17:16
Last Modified:09 Mar 2020 13:19

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