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    Spitzer Microlensing Parallax for OGLE-2017-BLG-0896 Reveals a Counter-Rotating Low-Mass Brown Dwarf (2018)

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    1805.08778v1.pdf (1.163Mb)
    Type of Content
    Journal Article
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    http://hdl.handle.net/10092/15765
    
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    • Science: Journal Articles [1104]
    Authors
    Shvartzvald Y
    Yee JC
    Skowron J
    Lee C-U
    Udalski A
    Novati SC
    Bozza V
    Beichman CA
    Bryden G
    Carey S
    Gaudi BS
    Henderson CB
    Zhu W
    Bachelet E
    Bolt G
    Christie G
    Maoz D
    Natusch T
    Pogge RW
    Street RA
    Tan T-G
    Tsapras Y
    Pietrukowicz P
    Soszyński I
    Szymański MK
    Mróz P
    Poleski R
    Kozłowski S
    Ulaczyk K
    Pawlak M
    Rybicki KA
    Iwanek P
    Albrow MD
    Cha S-M
    Chung S-J
    Gould A
    Han C
    Hwang K-H
    Jung YK
    Kim D-J
    Kim H-W
    Kim S-L
    Lee D-J
    Lee Y
    Park B-G
    Ryu Y-H
    Shin I-G
    Zang W
    Dominik M
    Helling C
    Hundertmark M
    Jørgensen UG
    Longa-Peña P
    Lowry S
    Sajadian S
    Burgdorf MJ
    Campbell-White J
    Ciceri S
    Evans DF
    Fujii YI
    Hinse TC
    Rahvar S
    Rabus M
    Skottfelt J
    Snodgrass C
    Southworth J
    show all
    Abstract

    The kinematics of isolated brown dwarfs in the Galaxy, beyond the solar neighborhood, is virtually unknown. Microlensing has the potential to probe this hidden population, as it can measure both the mass and five of the six phase-space coordinates (all except the radial velocity) even of a dark isolated lens. However, the measurements of both the microlens parallax and finite-source effects are needed in order to recover the full information. Here, we combine Spitzer satellite parallax measurement with the ground-based light curve, which exhibits strong finite-source effects, of event OGLE-2017-BLG-0896. We find that the lens is a ∼19MJ isolated brown dwarf. This is the lowest isolated-object mass measurement to date, only slightly above the common definition of a free-floating planet. The brown dwarf is located at ∼4 kpc toward the Galactic bulge, but with proper motion in the opposite direction of disk stars, possibly moving in the Galactic plane. While it is possibly a halo brown dwarf, it might also represent a different, unknown population.

    Keywords
    astro-ph.SR; gravitational lensing: micro — Galaxy: bulge
    ANZSRC Fields of Research
    51 - Physical sciences::5101 - Astronomical sciences::510109 - Stellar astronomy and planetary systems
    02 - Physical Sciences::0201 - Astronomical and Space Sciences::020102 - Astronomical and Space Instrumentation

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