Systematic KMTNet Planetary Anomaly Search. II. Six New q < 2 × 10<SUP>-4</SUP> Mass-ratio Planets - Archive ouverte HAL Access content directly
Journal Articles The Astronomical Journal Year : 2022

Systematic KMTNet Planetary Anomaly Search. II. Six New q < 2 × 10-4 Mass-ratio Planets

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Kyu-Ha Hwang
  • Function : Author
Weicheng Zang
  • Function : Author
Andrew Gould
Andrzej Udalski
  • Function : Author
Ian A. Bond
  • Function : Author
Hongjing Yang
  • Function : Author
Shude Mao
  • Function : Author
Michael D. Albrow
  • Function : Author
Sun-Ju Chung
  • Function : Author
Cheongho Han
  • Function : Author
Youn Kil Jung
  • Function : Author
Yoon-Hyun Ryu
  • Function : Author
In-Gu Shin
  • Function : Author
Yossi Shvartzvald
  • Function : Author
Jennifer C. Yee
  • Function : Author
Sang-Mok Cha
  • Function : Author
Dong-Jin Kim
  • Function : Author
Hyoun-Woo Kim
  • Function : Author
Seung-Lee Kim
  • Function : Author
Chung-Uk Lee
  • Function : Author
Dong-Joo Lee
  • Function : Author
Yongseok Lee
  • Function : Author
Byeong-Gon Park
  • Function : Author
Richard W. Pogge
  • Function : Author
Przemek Mróz
  • Function : Author
Radek Poleski
  • Function : Author
Jan Skowron
Michał K. Szymański
  • Function : Author
Igor Soszyński
  • Function : Author
Paweł Pietrukowicz
  • Function : Author
Szymon Kozłowski
  • Function : Author
Krzysztof Ulaczyk
  • Function : Author
Krzysztof A. Rybicki
  • Function : Author
Patryk Iwanek
  • Function : Author
Marcin Wrona
  • Function : Author
Mariusz Gromadzki
  • Function : Author
Fumio Abe
  • Function : Author
Richard Barry
  • Function : Author
David P. Bennett
  • Function : Author
Aparna Bhattacharya
  • Function : Author
Hirosame Fujii
  • Function : Author
Akihiko Fukui
Yuki Hirao
  • Function : Author
Yoshitaka Itow
Rintaro Kirikawa
  • Function : Author
Iona Kondo
Naoki Koshimoto
Brandon Munford
  • Function : Author
Yutaka Matsubara
  • Function : Author
Shota Miyazaki
Yasushi Muraki
Greg Olmschenk
Clément Ranc
  • Function : Author
  • PersonId : 1181264
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Nicholas J. Rattenbury
  • Function : Author
Yuki K. Satoh
  • Function : Author
Hikaru Shoji
  • Function : Author
Stela Ishitani Silva
  • Function : Author
Takahiro Sumi
Daisuke Suzuki
Paul J. Tristram
  • Function : Author
Atsunori Yonehara
  • Function : Author
Xiangyu Zhang
  • Function : Author
Wei Zhu
  • Function : Author
Matthew T. Penny
  • Function : Author

Abstract

We apply the automated AnomalyFinder algorithm of Paper I to 2018-2019 light curves from the ≃13 deg2 covered by the six KMTNet prime fields, with cadences Γ ≥ 2 hr-1. We find a total of 11 planets with mass ratios q < 2 × 10-4, including 6 newly discovered planets, 1 planet that was reported in Paper I, and recovery of 4 previously discovered planets. One of the new planets, OGLE-2018-BLG-0977Lb, is in a planetary caustic event, while the other five (OGLE-2018-BLG-0506Lb, OGLE-2018-BLG-0516Lb, OGLE-2019-BLG-1492Lb, KMT-2019-BLG-0253, and KMT-2019-BLG-0953) are revealed by a "dip" in the light curve as the source crosses the host-planet axis on the opposite side of the planet. These subtle signals were missed in previous by-eye searches. The planet-host separations (scaled to the Einstein radius), s, and planet-host mass ratios, q, are, respectively, (s, q × 105) = (0.88, 4.1), (0.96 ± 0.10, 8.3), (0.94 ± 0.07, 13), (0.97 ± 0.07, 18), (0.97 ± 0.04, 4.1), and (0.74, 18), where the " ± " indicates a discrete degeneracy. The 11 planets are spread out over the range $-5 \mathrm{log}q -3.7$ . Together with the two planets previously reported with q ~ 10-5 from the 2018-2019 nonprime KMT fields, this result suggests that planets toward the bottom of this mass-ratio range may be more common than previously believed.
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Dates and versions

insu-03672055 , version 1 (19-05-2022)

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Attribution - CC BY 4.0

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Kyu-Ha Hwang, Weicheng Zang, Andrew Gould, Andrzej Udalski, Ian A. Bond, et al.. Systematic KMTNet Planetary Anomaly Search. II. Six New q < 2 × 10-4 Mass-ratio Planets. The Astronomical Journal, 2022, 163, ⟨10.3847/1538-3881/ac38ad⟩. ⟨insu-03672055⟩
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