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OGLE-2014-BLG-1112LB : a microlensing brown dwarf detected through the channel of a gravitational binary-lens event

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Date
06/07/2017
Author
Han, C.
Udalski, A.
Bozza, V.
Szymański, M. K.
Soszyński, I.
Skowron, J.
Mróz, P.
Poleski, R.
Pietrukowicz, P.
Kozłowski, S.
Ulaczyk, K.
Wyrzykowski, Ł.
Novati, S. Calchi
D’Ago, G.
Dominik, M.
Hundertmark, M.
Jorgensen, U. G.
Scarpetta, G.
Keywords
Binaries: general
Brown dwarfs
Gravitational lensing: micro
QB Astronomy
QC Physics
NDAS
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Abstract
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) × 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.
Citation
Han , C , Udalski , A , Bozza , V , Szymański , M K , Soszyński , I , Skowron , J , Mróz , P , Poleski , R , Pietrukowicz , P , Kozłowski , S , Ulaczyk , K , Wyrzykowski , Ł , Novati , S C , D’Ago , G , Dominik , M , Hundertmark , M , Jorgensen , U G & Scarpetta , G 2017 , ' OGLE-2014-BLG-1112LB : a microlensing brown dwarf detected through the channel of a gravitational binary-lens event ' , Astrophysical Journal , vol. 843 , no. 2 , 87 . https://doi.org/10.3847/1538-4357/aa762f
Publication
Astrophysical Journal
Status
Peer reviewed
DOI
https://doi.org/10.3847/1538-4357/aa762f
ISSN
0004-637X
Type
Journal article
Rights
© 2017 The American Astronomical Society. All rights reserved. This work is made available online in accordance with the publisher’s policies. This is the final published version of the work, which was originally published at: https://doi.org/10.3847/1538-4357/aa762f
Description
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.
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URI
http://hdl.handle.net/10023/11405

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