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천문학회지(JKAS) , Vol.53 no.6 (2020)
pp.161~168

DOI : 10.5303/JKAS.2020.53.6.161

OGLE-2017-BLG-1049: ANOTHER GIANT PLANET MICROLENSING EVENT

Yun Hak Kim

(Korea Astronomy and Space Science Institute/University of Science and Technology, Korea, (UST))

Sun-Ju Chung

(Korea Astronomy and Space Science Institute/University of Science and Technology, Korea, (UST)/The KMTNet Collaboration)

A. Udalski

(Warsaw University Observatory/The OGLE Collaboration)

Ian A. Bond

(Institute of Natural and Mathematical Science, Massey University/The MOA Collaboration)

Youn Kil Jung

(Korea Astronomy and Space Science Institute/The KMTNet Collaboration)

Andrew Gould

(Korea Astronomy and Space Science Institute/Department of Astronomy, Ohio State University/Max-Planck-Institute for Astronomy/The KMTNet Collaboration)

Michael D. Albrow

(Department of Physics and Astronomy, University of Canterbury/The KMTNet Collaboration)

Cheongho Han

(Department of Physics, Chungbuk National University/The KMTNet Collaboration)

Kyu-Ha Hwang

(Korea Astronomy and Space Science Institute/The KMTNet Collaboration)

Yoon-Hyun Ryu

(Korea Astronomy and Space Science Institute/The KMTNet Collaboration)

In-Gu Shin

(Korea Astronomy and Space Science Institute/The KMTNet Collaboration)

Yossi Shvartzvald

(Department of Particle Physics and Astrophysics, Weizmann Institute of Science/The KMTNet Collaboration)

Jennifer C. Yee

(Center for Astrophysics | Harvard & Smithsonian/The KMTNet Collaboration)

Weicheng Zang

(Department of Astronomy and Tsinghua Centre for Astrophysics, Tsinghua University/The KMTNet Collaboration)

Sang-Mok Cha

(Korea Astronomy and Space Science Institute/School of Space Research, Kyung Hee University/The KMTNet Collaboration)

Dong-Jin Kim

(Korea Astronomy and Space Science Institute/The KMTNet Collaboration)

Hyoun-Woo Kim

(Korea Astronomy and Space Science Institute/Department of Astronomy and Space Science, Chungbuk National University/The KMTNet Collaboration)

Seung-Lee Kim

(Korea Astronomy and Space Science Institute/University of Science and Technology, Korea, (UST)/The KMTNet Collaboration)

Chung-Uk Lee

(Korea Astronomy and Space Science Institute/University of Science and Technology, Korea, (UST)/The KMTNet Collaboration)

Dong-Joo Lee

(Korea Astronomy and Space Science Institute/The KMTNet Collaboration)

Yongseok Lee

(Korea Astronomy and Space Science Institute/School of Space Research, Kyung Hee University/The KMTNet Collaboration)

Byeong-Gon Park

(Korea Astronomy and Space Science Institute/University of Science and Technology, Korea, (UST)/The KMTNet Collaboration)

Richard W. Pogge

(Department of Astronomy, Ohio State University/The KMTNet Collaboration)

Radek Poleski

(Warsaw University Observatory/The OGLE Collaboration)

Przemek Mroz

(Division of physics, Mathematics, and Astronomy, California institute of Technology/The OGLE Collaboration)

Jan Skowron

(Warsaw University Observatory/The OGLE Collaboration)

Michal K. Szymanski

(Warsaw University Observatory/The OGLE Collaboration)

Igor Soszynski

(Warsaw University Observatory/The OGLE Collaboration)

Pawel Pietrukowicz

(Warsaw University Observatory/The OGLE Collaboration)

Syzmon Koz lowski

(Warsaw University Observatory/The OGLE Collaboration)

Krzysztof Ulaczyk

(Warsaw University Observatory/Department of Physics, University of Warwick/The OGLE Collaboration)

Krzysztof A. Rybicki

(Warsaw University Observatory/The OGLE Collaboration)

Patryk Iwanek

(Warsaw University Observatory/The OGLE Collaboration)

Fumio Abe

(Institute for Space-Earth Environmental Research, Nagoya University/The MOA Collaboration)

Richard Barry

(Code 667, NASA Goddard Space Flight Center/The MOA Collaboration)

David P. Bennett

(Code 667, NASA Goddard Space Flight Center/Department of Astronomy, University of Maryland/The MOA Collaboration)

Aparna Bhattacharya

(Code 667, NASA Goddard Space Flight Center/Department of Astronomy, University of Maryland/The MOA Collaboration)

Martin Donachie

(Department of Physics, University of Auckland/The MOA Collaboration)

Hirosane Fujii

(Department of Earth and Space Science, Graduate School of Science, Osaka University/The MOA Collaboration)

Akihiko Fukui

(Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo/Instituto de Astrofisica de Canarias/The MOA Collaboration)

Yoshitaka Itow

(Institute for Space-Earth Environmental Research, Nagoya University/The MOA Collaboration)

Yuki Hirao

(Department of Earth and Space Science, Graduate School of Science, Osaka University/The MOA Collaboration)

Rintaro Kirikawa

(Department of Earth and Space Science, Graduate School of Science, Osaka University/The MOA Collaboration)

Iona Kondo

(Department of Earth and Space Science, Graduate School of Science, Osaka University/The MOA Collaboration)

Naoki Koshimoto

(Department of Astronomy, Graduate School of Science, The University of Tokyo/National Astronomical Observatory of Japan/The MOA Collaboration)

Yutaka Matsubara

(Institute for Space-Earth Environmental Research, Nagoya University/The MOA Collaboration)

Yasushi Muraki

(Institute for Space-Earth Environmental Research, Nagoya University/The MOA Collaboration)

Shota Miyazaki

(Department of Earth and Space Science, Graduate School of Science, Osaka University/The MOA Collaboration)

Clement Ranc

(Code 667, NASA Goddard Space Flight Center/The MOA Collaboration)

Nicholas J. Rattenbury

(Department of Physics, University of Auckland/The MOA Collaboration)

Yuki Satoh

(Department of Earth and Space Science, Graduate School of Science, Osaka University/The MOA Collaboration)

Hikaru Shoji

(Department of Earth and Space Science, Graduate School of Science, Osaka University/The MOA Collaboration)

Takahiro Sumi

(Department of Earth and Space Science, Graduate School of Science, Osaka University/The MOA Collaboration)

Daisuke Suzuki

(Department of Earth and Space Science, Graduate School of Science, Osaka University/The MOA Collaboration)

Paul J. Tristram

(University of Canterbury Mt. John Observatory/The MOA Collaboration)

Yuzuru Tanaka

(Department of Earth and Space Science, Graduate School of Science, Osaka University/The MOA Collaboration)

Tsubasa Yamawaki

(Department of Earth and Space Science, Graduate School of Science, Osaka University/The MOA Collaboration)

Atsunori Yonehara

(Department of Physics, Faculty of Science, Kyoto Sangyo Univers/The MOA Collaboration)

We report the discovery of a giant exoplanet in the microlensing event OGLE-2017-BLG-1049, with a planet―host star mass ratio of q = 9.53 ± 0.39 × 10-3 and a caustic crossing feature in Korea Microlensing Telescope Network (KMTNet) observations. The caustic crossing feature yields an angular Einstein radius of θE = 0.52 ± 0.11 mas. However, the microlens parallax is not measured because the time scale of the event, tE ≃ 29 days, is too short. Thus, we perform a Bayesian analysis to estimate physical quantities of the lens system. We find that the lens system has a star with mass Mh = 0.55+0.36 -0.29 M⊙ hosting a giant planet with Mp = 5.53+3.62 -2.87 MJup, at a distance of DL = 5.67+1.11 -1.52 kpc. The projected star{planet separation is aㅗ = 3.92+1.10 -1.32 au. This means that the planet is located beyond the snow line of the host. The relative lens{source proper motion is μrel ~ 7 mas yr-1, thus the lens and source will be separated from each other within 10 years. After this, it will be possible to measure the flux of the host star with 30 meter class telescopes and to determine its mass.

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