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http://dx.doi.org/10.5303/JKAS.2020.53.1.9

KMT-2018-BLG-0029LB: A VERY LOW MASS-RATIO Spitzer MICROLENS PLANET  

Gould, Andrew (Max-Planck-Institute for Astronomy)
Ryu, Yoon-Hyun (Korea Astronomy and Space Science Institute)
Novati, Sebastiano Calchi (IPAC)
Zang, Weicheng (Physics Department and Tsinghua Centre for Astrophysics, Tsinghua University)
Albrow, Michael D. (University of Canterbury, Department of Physics and Astronomy)
Chung, Sun-Ju (Korea Astronomy and Space Science Institute)
Han, Cheongho (Department of Physics, Chungbuk National University)
Hwang, Kyu-Ha (Korea Astronomy and Space Science Institute)
Jung, Youn Kil (Korea Astronomy and Space Science Institute)
Shin, In-Gu (Korea Astronomy and Space Science Institute)
Shvartzvald, Yossi (IPAC)
Yee, Jennifer C. (Center for Astrophysics / Harvard & Smithsonian)
Cha, Sang-Mok (Korea Astronomy and Space Science Institute)
Kim, Dong-Jin (Korea Astronomy and Space Science Institute)
Kim, Hyoun-Woo (Korea Astronomy and Space Science Institute)
Kim, Seung-Lee (Korea Astronomy and Space Science Institute)
Lee, Chung-Uk (Korea Astronomy and Space Science Institute)
Lee, Dong-Joo (Korea Astronomy and Space Science Institute)
Lee, Yongseok (Korea Astronomy and Space Science Institute)
Park, Byeong-Gon (Korea Astronomy and Space Science Institute)
Pogge, Richard W. (Department of Astronomy Ohio State University)
Beichman, Charles (NASA Exoplanet Science Institute, California Institute of Technology)
Bryden, Geoff (IPAC)
Carey, Sean (Spitzer, Science Center)
Gaudi, B. Scott (Department of Astronomy Ohio State University)
Henderson, Calen B. (IPAC)
Zhu, Wei (Canadian Institute for Theoretical Astrophysics, University of Toronto)
Fouque, Pascal (CFHT Corporation)
Penny, Matthew T. (Department of Astronomy Ohio State University)
Petric, Andreea (CFHT Corporation)
Burdullis, Todd (CFHT Corporation)
Mao, Shude (Department of Astronomy and Tsinghua Centre for Astrophysics, Tsinghua University)
Publication Information
Journal of The Korean Astronomical Society / v.53, no.1, 2020 , pp. 9-26 More about this Journal
Abstract
At q = 1.81 ± 0.20 × 10-5, KMT-2018-BLG-0029Lb has the lowest planet-host mass ratio q of any microlensing planet to date by more than a factor of two. Hence, it is the first planet that probes below the apparent "pile-up" at q = 5-10 ×10-5. The event was observed by Spitzer, yielding a microlens-parallax πE measurement. Combined with a measurement of the Einstein radius θE from finite-source effects during the caustic crossings, these measurements imply masses of the host Mhost = 1.14+0.10-0.12 M⊙ and planet Mplanet = 7.59+0.75-0.69 M⊕, system distance DL = 3.38+0.22-0.26 kpc and projected separation a⊥ = 4.27+0.21-0.23 AU. The blended light, which is substantially brighter than the microlensed source, is plausibly due to the lens and could be observed at high resolution immediately.
Keywords
gravitational lensing: micro; planetary systems;
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