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    OGLE-2016-BLG-0693LB: Probing the brown dwarf desert with microlensing

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    Author
    Ryu YH
    Udalski A
    Yee JC
    Albrow MD
    Chung SJ
    Gould A
    Han C
    Hwang KH
    Jung YK
    Shin IG
    Zhu W
    Cha SM
    Kim DJ
    Kim HW
    Kim SL
    Lee CU
    Lee Y
    Park BG
    Pogge RW
    Pietrukowicz P
    Kozłowski S
    Poleski R
    Skowron J
    Mróz P
    Szymański MK
    Soszyński I
    Pawlak M
    Ulaczyk K
    Date
    2017
    Permanent Link
    http://hdl.handle.net/10092/16270

    © 2017. The American Astronomical Society. All rights reserved. We present an analysis of microlensing event OGLE-2016-BLG-0693, based on the survey-only microlensing observations by the OGLE and KMTNet groups. In order to analyze the light curve, we consider the effects of parallax, orbital motion, and baseline slope, and also refine the result using a Galactic model prior. From the microlensing analysis, we find that the event is a binary composed of a low-mass brown dwarf (49+20-18MJ) companion and a K- or G-dwarf host, which lies at a distance of 5.0±0.6 kpc toward the Galactic bulge. The projected separation between the brown dwarf and its host star is less than .5 au, thus it is likely that the brown dwarf companion is located in the brown dwarf desert.

    Subjects
    binaries: general
     
    brown dwarfs
     
    gravitational lensing: micro
     
    Field of Research::02 - Physical Sciences::0201 - Astronomical and Space Sciences::020110 - Stellar Astronomy and Planetary Systems
     
    Field of Research::02 - Physical Sciences::0201 - Astronomical and Space Sciences::020102 - Astronomical and Space Instrumentation
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    • Science: Journal Articles [906]

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