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Spitzer Microlensing of MOA-2016-BLG-231L: A Counter-rotating Brown Dwarf Binary in the Galactic DiskWe analyze the binary microlensing event MOA-2016-BLG-231, which was observed from the ground and from Spitzer. The lens is composed of very-low-mass brown dwarfs (BDs) with M(1)= 21(+12, -5) M(J) and M(2)=9(+5. -2) M(J), and it is located in the Galactic disk D(L)=2.85(+0.88, -0.50) kpc. This is the fifth binary brown dwarf discovered by microlensing, and the BD binary is moving counter to the orbital motion of disk stars. Constraints on the lens physical properties come from late-time, non-caustic-crossing features of the Spitzer light curve. Thus, MOA-2016-BLG-231 shows how Spitzer plays a crucial role in resolving the nature of BDs in binary BD events with short timescales (≲10 days).
Document ID
20205002549
Acquisition Source
Goddard Space Flight Center
Document Type
Reprint (Version printed in journal)
Authors
Sun-Ju Chung (Korea Astronomy and Space Science Institute Daejeon, South Korea)
Andrew Gould (Korea Astronomy and Space Science Institute Daejeon, South Korea)
Jan Skowron (University of Warsaw Warsaw, Poland)
Ian A. Bond (Massey University Palmerston North, New Zealand)
Wei Zhu (Canadian Institute for Theoretical Astrophysics Toronto, Ontario, Canada)
Michael D. Albrow (University of Canterbury Christchurch, New Zealand)
Youn Kil Jung (Korea Astronomy and Space Science Institute Daejeon, South Korea)
Cheongho Han (Chungbuk National University Cheongju-si, South Korea)
Kyu-Ha Hwang (Korea Astronomy and Space Science Institute Daejeon, South Korea)
Yoon-Hyun Ryu (Korea Astronomy and Space Science Institute Daejeon, South Korea)
In-Gu Shin (Harvard-Smithsonian Center for Astrophysics Cambridge, Massachusetts, United States)
Yossi Shvartzvald (California Institute of Technology Pasadena, California, United States)
Jennifer C. Yee (Harvard-Smithsonian Center for Astrophysics Cambridge, Massachusetts, United States)
Weicheng Zang (Tsinghua University Beijing, Beijing, China)
Sang-Mok Cha (Korea Astronomy and Space Science Institute Daejeon, South Korea)
Dong-Jin Kim (Korea Astronomy and Space Science Institute Daejeon, South Korea)
Hyoun-Woo Kim (Korea Astronomy and Space Science Institute Daejeon, South Korea)
Seung-Lee Kim (Korea Astronomy and Space Science Institute Daejeon, South Korea)
Yun-Hak Kim (Korea Astronomy and Space Science Institute Daejeon, South Korea)
Chung-Uk Lee (Korea Astronomy and Space Science Institute Daejeon, South Korea)
Dong-Joo Lee (Korea Astronomy and Space Science Institute Daejeon, South Korea)
Yongseok Lee (Korea Astronomy and Space Science Institute Daejeon, South Korea)
Byeong-Gon Park (Korea Astronomy and Space Science Institute Daejeon, South Korea)
Richard W. Pogge (The Ohio State University Columbus, Ohio, United States)
Andrzej Udalski (University of Warsaw Warsaw, Poland)
Radek Poleski (The Ohio State University Columbus, Ohio, United States)
Przemek Mroz (University of Warsaw Warsaw, Poland)
Pawel Pietrukowicz (University of Warsaw Warsaw, Poland)
Michal K. Szymanski (University of Warsaw Warsaw, Poland)
Igor Soszynski (University of Warsaw Warsaw, Poland)
Szymon Kozłowski (University of Warsaw Warsaw, Poland)
Krzysztof Ulaczyk (University of Warsaw Warsaw, Poland)
Michal Pawlak (University of Warsaw Warsaw, Poland)
Charles A. Beichman (California Institute of Technology Pasadena, California, United States)
Geoffery Bryden (Jet Propulsion Lab La Cañada Flintridge, California, United States)
Sebastiano Calchi Novati (California Institute of Technology Pasadena, California, United States)
Sean Carey (California Institute of Technology Pasadena, California, United States)
B. Scott Gaudi (The Ohio State University Columbus, Ohio, United States)
Calen B. Henderson (California Institute of Technology Pasadena, California, United States)
Fumio Abe (Nagoya University Nagoya, Japan)
Richard Barry (Goddard Space Flight Center Greenbelt, Maryland, United States)
David Bennett (University of Maryland, College Park College Park, Maryland, United States)
Aparna Bhattacharya (University of Maryland, College Park College Park, Maryland, United States)
Martin Donachie (University of Auckland Auckland, New Zealand)
Akihiko Fukui (National Astronomical Observatory of Japan Mitaka-shi, Japan)
Yuki Hirao (Osaka University Osaka, Japan)
Yoshitaka Itow (Nagoya University Nagoya, Japan)
Kohei Kawasaki (Osaka University Osaka, Japan)
Iona Kondo (Osaka University Osaka, Japan)
Naoki Koshimoto (University of Tokyo Tokyo, Japan)
Man Cheung Alex Li (University of Auckland Auckland, New Zealand)
Yutaka Matsubara (Nagoya University Nagoya, Japan)
Yasushi Muraki (Nagoya University Nagoya, Japan)
Shota Miyazaki (Osaka University Osaka, Japan)
Masayuki Nagakane (Osaka University Osaka, Japan)
Clement Ranc (Goddard Space Flight Center Greenbelt, Maryland, United States)
Nicholas J. Rattenbury (University of Auckland Auckland, New Zealand)
Haruno Suematsu (Osaka University Osaka, Japan)
Denis J. Sullivan (Victoria University Kampala, Uganda)
Takahiro Sumi (Osaka University Osaka, Japan)
Daisuke Suzuki (Japan Aerospace Exploration Agency Tokyo, Japan)
Paul J. Tristram (University of Canterbury Christchurch, New Zealand)
Atsunori Yonehara (Kyoto Sangyo University Kyoto, Kyôto, Japan)
Date Acquired
May 21, 2020
Publication Date
January 30, 2019
Publication Information
Publication: The Astrophysical Journal
Publisher: The American Astronomical Society
Volume: 871
Issue: 2
Issue Publication Date: February 1, 2019
ISSN: 0004-637X
e-ISSN: 1538-4357
DOI: 10.3847/1538-4357/aaf861
Subject Category
Astrophysics
Funding Number(s)
WBS: 134180.04.04.01
CONTRACT_GRANT: 2018-1-830-02
CONTRACT_GRANT: AST-1516842
CONTRACT_GRANT: JPL 1500811
CONTRACT_GRANT: 2017R1A4A1015178
Distribution Limits
Public
Copyright
Portions of document may include copyright protected material.
Technical Review
External Peer Committee

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