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, Zhecheng Hu Department of Astronomy, Tsinghua University , Beijing 10084, China E-mail: hzc22@mails.tsinghua.edu.cn Search for other works by this author on: Oxford Academic Wei Zhu Department of Astronomy, Tsinghua University , Beijing 10084, China E-mail: weizhu@tsinghua.edu.cn Search for other works by this author on: Oxford Academic Andrew Gould Max-Planck-Institute for Astronomy , Königstuhl 17, 69117 Heidelberg, Germany Department of Astronomy, Ohio State University , 140W. 18th Ave., Columbus, OH 43210, USA Search for other works by this author on: Oxford Academic Andrzej Udalski Astronomical Observatory, University of Warsaw , Al. Ujazdowskie 4, 00-478 Warszawa, Poland Search for other works by this author on: Oxford Academic Takahiro Sumi Department of Earth and Space Science, Graduate School of Science, Osaka University , Toyonaka, Osaka 560-0043, Japan Search for other works by this author on: Oxford Academic Ping Chen Department of Particle Physics and Astrophysics, Weizmann Institute of Science , Rehovot 7610001, Israel Search for other works by this author on: Oxford Academic Sebastiano Calchi Novati IPAC , Mail Code 100-22, Caltech, 1200 E. California Blvd., Pasadena, CA 91125, USA Search for other works by this author on: Oxford Academic Jennifer C Yee Center for Astrophysics, Harvard, and Smithsonian , 60 Garden Street, Cambridge, MA 02138, USA Search for other works by this author on: Oxford Academic Charles A Beichman IPAC , Mail Code 100-22, Caltech, 1200 E. California Blvd., Pasadena, CA 91125, USA Search for other works by this author on: Oxford Academic Geoffery Bryden Jet Propulsion Laboratory, California Institute of Technology , 4800 Oak Grove Drive, Pasadena, CA 91109, USA Search for other works by this author on: Oxford Academic
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The Spitzer Team
The OGLE Collaboration
MOA Collaboration
Author Notes
Monthly Notices of the Royal Astronomical Society, stae1906, https://doi.org/10.1093/mnras/stae1906
Published:
07 August 2024
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Zhecheng Hu, Wei Zhu, Andrew Gould, Andrzej Udalski, Takahiro Sumi, Ping Chen, Sebastiano Calchi Novati, Jennifer C Yee, Charles A Beichman, Geoffery Bryden, Sean Carey, Michael Fausnaugh, B Scott Gaudi, Calen B Henderson, Yossi Shvartzvald, Benjamin Wibking, Przemek Mróz, Jan Skowron, Radosław Poleski, Michał K Szymański, Igor Soszyński, Paweł Pietrukowicz, Szymon Kozłowski, Krzysztof Ulaczyk, Krzysztof A Rybicki, Patryk Iwanek, Marcin Wrona, Mariusz Gromadzki, Fumio Abe, Richard Barry, David P Bennett, Aparna Bhattacharya, Ian A Bond, Hirosane Fujii, Akihiko f*ckui, Ryusei Hamada, Yuki Hirao, Stela Ish*tani Silva, Yosh*taka Itow, Rintaro Kirikawa, Naoki Koshimoto, Yutaka Matsubara, Shota Miyazaki, Yasushi Muraki, Greg Olmschenk, Clément Ranc, Nicholas J Rattenbury, Yuki Satoh, Daisuke Suzuki, Mio Tomoyoshi, Paul J Tristram, Aikaterini Vandorou, Hibiki Yama, Kansuke Yamash*ta, OGLE-2015-BLG-0845L: A low-mass M dwarf from the microlensing parallax and xallarap effects, Monthly Notices of the Royal Astronomical Society, 2024;, stae1906, https://doi.org/10.1093/mnras/stae1906
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Abstract
We present the analysis of the microlensing event OGLE-2015-BLG-0845, which was affected by both the microlensing parallax and xallarap effects. The former was detected via the simultaneous observations from the ground and Spitzer, and the latter was caused by the orbital motion of the source star in a relatively close binary. The combination of these two effects led to a mass measurement of the lens object, revealing a low-mass (0.14 ± 0.05M⊙) M-dwarf at the bulge distance (7.6 ± 1.0kpc). The source binary consists of a late F-type subgiant and a K-type dwarf of ∼1.2M⊙ and ∼0.9M⊙, respectively, and the orbital period is 70 ± 10days. OGLE-2015-BLG-0845 is the first single-lens event in which the lens mass is measured via the binarity of the source. Given the abundance of binary systems as potential microlensing sources, the xallarap effect may not be a rare phenomenon. Our work thus highlights the application of the xallarap effect in the mass determination of microlenses, and the same method can be used to identify isolated dark lenses.
gravitational lensing: micro, methods: data analysis, binaries: general
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Author notes
The Spitzer Team
The OGLE Collaboration
MOA Collaboration
© The Author(s) 2024. Published by Oxford University Press on behalf of Royal Astronomical Society.
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.
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