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

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...

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Published inJournal of the Korean Astronomical Society, 53(1) pp. 9 - 26
Main Authors Andrew Gould, 류윤현, Sebastiano Calchi Novati, Weicheng Zang, Michael D. Albrow, 정선주, CHEONGHOHAN, 황규하(한국천문연구원, 정연길(한국천문연구원, 신인구(한국천문연구원, Yossi Shvartzvald, Jennifer C. Yee, 차상목, Dong-Jin Kim, 김현우(한국천문연구원, 김승리, 이정욱(Korea Astronomy and Space Science Institute, Korea University of Science and Technology, Dong-Joo Lee, 이용석, Byeong-Gon Park, Richard W. Pogge, Charles Beichman, Geoff Bryden, Sean Carey, B. Scott Gaudi, Calen B. Henderson, Wei Zhu, Pascal Fouque, Matthew T. Penny, Andreea Petric, Todd Burdullis, Shude Mao
Format Journal Article
LanguageEnglish
Published 한국천문학회 01.02.2020
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ISSN1225-4614
2288-890X
DOI10.5303/JKAS.2020.53.1.9

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Summary: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 pi_E measurement. Combined with a measurement of the Einstein radius theta_E from finite-source effects during the caustic crossings, these measurements imply masses of the host M_host = 1.14+0.10-0.12 M_sun and planet M_planet = 7.59+0.75-0.69 M_Earth, system distance D_L = 3.38+0.22-0.26 kpc and projected separation a_p = 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. KCI Citation Count: 19
ISSN:1225-4614
2288-890X
DOI:10.5303/JKAS.2020.53.1.9