An Earth-mass planet in a time of COVID-19: KMT-2020-BLG-0414Lb

  title={An Earth-mass planet in a time of COVID-19: KMT-2020-BLG-0414Lb},
  author={Weicheng Zang and Cheongho Han and Iona Kondo and Jennifer C. Yee and Chung-Uk Lee and A. Gould and Shude Mao and Leandro de Almeida and Yossi Shvartzvald and Xiangyu Zhang and Michael D. Albrow and Sun-Ju Chung and Kyu-Ha Hwang and Youn Kil Jung and Yoon-Hyun Ryu and In-Gu Shin and Sang-Mok Cha and Dong-Jin Kim and Hyoun-Woo Kim and Seung-Lee Kim and Dong-Joo Lee and Yongseok Lee and Byeong-Gon Park and Richard W. Pogge and Jack Drummond and T. G. Tan and Jos{\'e} Dias do Nascimento J{\'u}nior and Dan Maoz and Matthew T. Penny and Wei Zhu and Ian A. Bond and Fumio Abe and Richard K. Barry and David P. Bennett and Aparna Bhattacharya and Martin A Donachie and Hirosane Fujii and Akihiko Fukui and Yuki Hirao and Yoshitaka Itow and Rintaro Kirikawa and Naoki Koshimoto and Man Cheung Alex Li and Yutaka Matsubara and Yasushi Muraki and Shota Miyazaki and Greg Olmschenk and Cl{\'e}ment Ranc and Nicholas J. Rattenbury and Yuki Satoh and Hikaru Shoji and Stela Ishitani Silva and Takahiro Sumi and Daisuke Suzuki and Yuzuru Tanaka and Paul . J. Tristram and Tsubasa Yamawaki and Atsunori Yonehara and Andreea O. Petric and Todd W. Burdullis and Pascal Fouqu'e},
  journal={Research in Astronomy and Astrophysics},
We report the discovery of KMT-2020-BLG-0414Lb, with a planet-to-host mass ratio q 2 = 0.9–1.2 × 10−5 = 3–4 ⊕ at 1σ, which is the lowest mass-ratio microlensing planet to date. Together with two other recent discoveries (4 ≲ q/q ⊕ ≲ 6), it fills out the previous empty sector at the bottom of the triangular (log s, log q) diagram, where s is the planet-host separation in units of the angular Einstein radius θE. Hence, these discoveries call into question the existence, or at least the strength… 
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2020b, AJ
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