MOA-2019-BLG-008Lb: A New Microlensing Detection of an Object at the Planet/Brown Dwarf Boundary

  title={MOA-2019-BLG-008Lb: A New Microlensing Detection of an Object at the Planet/Brown Dwarf Boundary},
  author={Etienne Bachelet and Yiannis Tsapras and A. Gould and Rachel A. Street and David P. Bennett and M. Hundertmark and Valerio Bozza and D. M. Bramich and Arnaud Cassan and Martin Dominik and K. Horne and S. Mao and A. Saha and Joachim Wambsganss and Weicheng Zang and Fumio Abe and Richard K. Barry and David P. Bennett and Aparna Bhattacharya and Ian A. Bond and Akihiko Fukui and Hirosane Fujii and Yuki Hirao and Yoshitaka Itow and Rintaro Kirikawa and Iona Kondo and Naoki Koshimoto and Yutaka Matsubara and Sho Matsumoto and Shota Miyazaki and Yasushi Muraki and Greg Olmschenk and Cl{\'e}ment Ranc and Arisa Okamura and Nicholas J. Rattenbury and Yuki Satoh and Takahiro Sumi and Daisuke Suzuki and Stela Ishitani Silva and Taiga Toda and Paul . J. Tristram and Aikaterini Vandorou and Hibiki Yama and Michael D. Albrow and Sun-Ju Chung and Cheongho Han and Kyu-Ha Hwang and Youn Kil Jung and Yoon-Hyun Ryu and In-Gu Shin and Yossi Shvartzvald and Jennifer C. Yee and Sang-Mok Cha and Dong-Jin Kim and Seung-Lee Kim and Chung-Uk Lee and Dong-Joo Lee and Yongseok Lee and B.-G. Park and Richard W. Pogge and Andrzej Udalski and Przemek Mr{\'o}z and Radosław Poleski and Jan Skowron and Michał K. Szymański and Igor Soszyński and Paweł Pietrukowicz and Szymon Kozłowski and Krzysztof Ulaczyk and Krzysztof A. Rybicki and Patryk Iwanek and Marcin Wrona and Mariusz Gromadzki},
  journal={The Astronomical Journal},
We report on the observations, analysis and interpretation of the microlensing event MOA-2019-BLG-008. The observed anomaly in the photometric light curve is best described through a binary lens model. In this model, the source did not cross caustics and no finite-source effects were observed. Therefore, the angular Einstein ring radius θ E cannot be measured from the light curve alone. However, the large event duration, t E ∼ 80 days, allows a precise measurement of the microlensing parallax… 


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