Logo
ScienceStack
Table of Contents
Fetching ...
Sign In

Mass Production of 2023 KMTNet Microlensing Planets. II: Two Planets and A Brown Dwarf

Zhixing Li, Hongyu Li, Weicheng Zang, Yoon-Hyun Ryu, Andrzej Udalski, Takahiro Sumi, Hongjing Yang, Yuchen Tang, Jiyuan Zhang, Shude Mao, Michael D. Albrow, Sun-Ju Chung, Andrew Gould, Cheongho Han, Kyu-Ha Hwang, Youn Kil Jung, In-Gu Shin, Yossi Shvartzvald, Jennifer C. Yee, Sang-Mok Cha, Dong-Jin Kim, Seung-Lee Kim, Chung-Uk Lee, Dong-Joo Lee, Yongseok Lee, Byeong-Gon Park, Richard W. Pogge, Przemek Mróz, Michał K. Szymański, Jan Skowron, Radoslaw Poleski, Igor Soszyński, Paweł Pietrukowicz, Szymon Kozłowski, Krzysztof A. Rybicki, Patryk Iwanek, Krzysztof Ulaczyk, Marcin Wrona, Mariusz Gromadzki, Mateusz J. Mróz, Fumio Abe, Ken Bando, David P. Bennett, Aparna Bhattacharya, Ian A. Bond, Akihiko Fukui, Ryusei Hamada, Shunya Hamada, Naoto Hamasak, Yuki Hirao, Stela Ishitani Silva, Naoki Koshimoto, Yutaka Matsubara, Shota Miyazaki, Yasushi Muraki, Tutumi Nagai, Kansuke Nunota, Greg Olmschenk, Clément Ranc, Nicholas J. Rattenbury, Yuki Satoh, Daisuke Suzuki, Sean Terry, Paul J. Tristram, Aikaterini Vandorou, Hibiki Yama

Abstract

To expand the homogeneous microlensing planetary sample of the Korea Microlensing Telescope Network (KMTNet), we investigate six planetary candidates identified by the AnomalyFinder search in the 2023 prime-field data, namely KMT-2023-BLG-1592, OGLE-2023-BLG-0766, KMT-2023-BLG-0332, KMT-2023-BLG-0486, KMT-2023-BLG-0792, and OGLE-2023-BLG-1043. Light-curve modeling indicates that the first two events have planetary mass ratios of $\log q \sim -3.0$ and $-2.6$, while the third exhibits a brown dwarf mass ratio of $\log q \sim -1.4$. The remaining three events show the well-known degeneracy between the binary-lens single-source (2L1S) and single-lens binary-source (1L2S) interpretations. A Bayesian analysis yields companion masses of about 0.6 and 1.2 Jupiter masses for the two planetary systems, likely orbiting beyond the snow lines of M- or K-dwarf hosts. A review of the KMTNet planetary sample shows that candidates discovered by AnomalyFinder are significantly more likely to exhibit the 2L1S/1L2S degeneracy, consistent with the tendency of AnomalyFinder to detect subtler planetary signals.

Mass Production of 2023 KMTNet Microlensing Planets. II: Two Planets and A Brown Dwarf

Abstract

To expand the homogeneous microlensing planetary sample of the Korea Microlensing Telescope Network (KMTNet), we investigate six planetary candidates identified by the AnomalyFinder search in the 2023 prime-field data, namely KMT-2023-BLG-1592, OGLE-2023-BLG-0766, KMT-2023-BLG-0332, KMT-2023-BLG-0486, KMT-2023-BLG-0792, and OGLE-2023-BLG-1043. Light-curve modeling indicates that the first two events have planetary mass ratios of and , while the third exhibits a brown dwarf mass ratio of . The remaining three events show the well-known degeneracy between the binary-lens single-source (2L1S) and single-lens binary-source (1L2S) interpretations. A Bayesian analysis yields companion masses of about 0.6 and 1.2 Jupiter masses for the two planetary systems, likely orbiting beyond the snow lines of M- or K-dwarf hosts. A review of the KMTNet planetary sample shows that candidates discovered by AnomalyFinder are significantly more likely to exhibit the 2L1S/1L2S degeneracy, consistent with the tendency of AnomalyFinder to detect subtler planetary signals.
Paper Structure (16 sections, 7 equations, 10 figures, 9 tables)

This paper contains 16 sections, 7 equations, 10 figures, 9 tables.

Table of Contents

  1. Introduction
  2. Observations
  3. Light-curve Analysis
  4. Preamble
  5. KMT-2023-BLG-1592
  6. OGLE-2023-BLG-0766
  7. KMT-2023-BLG-0332
  8. KMT-2023-BLG-0486
  9. KMT-2023-BLG-0792
  10. OGLE-2023-BLG-1043
  11. Source and Lens Properties
  12. Preamble
  13. KMT-2023-BLG-1592
  14. OGLE-2023-BLG-0766
  15. KMT-2023-BLG-0332
  16. ...and 1 more sections

Figures (10)

  • Figure 1: Light curves of KMT-2023-BLG-1592 with the 2L1S "Close", "Wide" and the 1L2S models shown as solid black, cyan and yellow curves, respectively. The lower panel provides a zoom-in view of the anomaly. Data from different observatories are plotted in different colors. The corresponding lensing model parameters are listed in Table \ref{['tab:parm-a']}.
  • Figure 2: Geometries of the 2L1S solutions for KMT-2023-BLG-1592, OGLE-2023-BLG-0766, KMT-2023-BLG-0332, KMT-2023-BLG-0792, and OGLE-2023-BLG-1043, each of which exhibits a pair of "Close/Wide" degeneracies. For each event, the upper and lower panels display the corresponding "Wide" and "Close" solutions. In every panel, the red curves indicate the caustic structures, the black curve traces the source trajectory, and the arrow marks the direction of source motion.
  • Figure 3: The observed data and models for OGLE-2023-BLG-0766. The symbols are similar to those in Figure \ref{['fig:lc-a']}.
  • Figure 4: The observed data and models for KMT-2023-BLG-0332. The symbols are similar to those in Figure \ref{['fig:lc-a']}.
  • Figure 5: Light curves and models for KMT-2023-BLG-0486. The symbols are similar to those in Figure \ref{['fig:lc-a']}.
  • ...and 5 more figures