OGLE-2014-BLG-1112LB : a microlensing brown dwarf detected through the channel of a gravitational binary-lens event
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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) × 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.
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 . DOI: 10.3847/1538-4357/aa762f
© 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
DescriptionWork 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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