Four Planets Found through Microlensing Events Involving Faint Source Stars
To conduct a comprehensive demographic study of microlensing planets, it is essential to detect all planetary signals that exceed a predefined threshold through a detailed analysis of survey data. We reanalyzed previous data from the Korea Microlensing Telescope Network survey to search for weak pla...
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IOP Publishing
2025-01-01
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| Series: | The Astronomical Journal |
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| Online Access: | https://doi.org/10.3847/1538-3881/adc5e7 |
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| author | Cheongho Han Michael D. Albrow Chung-Uk Lee Sun-Ju Chung Andrew Gould Kyu-Ha Hwang Youn Kil Jung Yoon-Hyun Ryu Yossi Shvartzvald In-Gu Shin Jennifer C. Yee Hongjing Yang Weicheng Zang Sang-Mok Cha Doeon Kim Dong-Jin Kim Seung-Lee Kim Dong-Joo Lee Yongseok Lee Byeong-Gon Park Richard W. Pogge |
| author_facet | Cheongho Han Michael D. Albrow Chung-Uk Lee Sun-Ju Chung Andrew Gould Kyu-Ha Hwang Youn Kil Jung Yoon-Hyun Ryu Yossi Shvartzvald In-Gu Shin Jennifer C. Yee Hongjing Yang Weicheng Zang Sang-Mok Cha Doeon Kim Dong-Jin Kim Seung-Lee Kim Dong-Joo Lee Yongseok Lee Byeong-Gon Park Richard W. Pogge |
| author_sort | Cheongho Han |
| collection | DOAJ |
| description | To conduct a comprehensive demographic study of microlensing planets, it is essential to detect all planetary signals that exceed a predefined threshold through a detailed analysis of survey data. We reanalyzed previous data from the Korea Microlensing Telescope Network survey to search for weak planetary signals in lensing events involving faint source stars. For events with potential short-term anomalies identified in the initial search, we validated the signals using rereduced data and conducted detailed modeling of the anomalous events. This process led to the discovery of four planetary events: KMT-2017-BLG-2197, KMT-2022-BLG-1790, KMT-2022-BLG-2076, and KMT-2023-BLG-2209. For all these events, the modeling resulted in two solutions due to the well-known inner–outer degeneracy. The estimated masses of the planets and their hosts are approximately ( M _p / M _J , M _h / M _⊙ ) ∼ (0.36, 7.9) for KMT-2017-BLG-2197L, ∼(0.6, 1.7) for KMT-2022-BLG-1790L, ∼(0.67, 0.9) for KMT-2022-BLG-2076L, and ∼(0.73, 0.8) for KMT-2023-BLG-2209L. The planetary systems KMT-2017-BLG-2197L and KMT-2022-BLG-1790L are likely located in the Galactic bulge, while KMT-2022-BLG-2076L and KMT-2023-BLG-2209L are more likely situated in the disk. |
| format | Article |
| id | doaj-art-9aefd6b614034caabea7dcb55e8958bd |
| institution | DOAJ |
| issn | 1538-3881 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IOP Publishing |
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| series | The Astronomical Journal |
| spelling | doaj-art-9aefd6b614034caabea7dcb55e8958bd2025-08-20T03:11:49ZengIOP PublishingThe Astronomical Journal1538-38812025-01-01169628810.3847/1538-3881/adc5e7Four Planets Found through Microlensing Events Involving Faint Source StarsCheongho Han0https://orcid.org/0000-0002-2641-9964Michael D. Albrow1https://orcid.org/0000-0003-3316-4012Chung-Uk Lee2https://orcid.org/0000-0003-0043-3925Sun-Ju Chung3Andrew Gould4Kyu-Ha Hwang5Youn Kil Jung6Yoon-Hyun Ryu7Yossi Shvartzvald8https://orcid.org/0000-0003-1525-5041In-Gu Shin9Jennifer C. Yee10https://orcid.org/0000-0001-9481-7123Hongjing Yang11Weicheng Zang12Sang-Mok Cha13Doeon Kim14Dong-Jin Kim15Seung-Lee Kim16Dong-Joo Lee17Yongseok Lee18Byeong-Gon Park19https://orcid.org/0000-0002-6982-7722Richard W. Pogge20https://orcid.org/0000-0003-1435-3053Department of Physics, Chungbuk National University , Cheongju 28644, Republic of Korea ; cheongho@astroph.chungbuk.ac.krUniversity of Canterbury , Department of Physics and Astronomy, Private Bag 4800, Christchurch 8020, New ZealandKorea Astronomy and Space Science Institute , Daejon 34055, Republic of Korea ; leecu@kasi.re.krKorea Astronomy and Space Science Institute , Daejon 34055, Republic of Korea ; leecu@kasi.re.krMax Planck Institute for Astronomy , Königstuhl 17, D-69117 Heidelberg, Germany; Department of Astronomy, The Ohio State University , 140 W. 18th Ave., Columbus, OH 43210, USAKorea Astronomy and Space Science Institute , Daejon 34055, Republic of Korea ; leecu@kasi.re.krKorea Astronomy and Space Science Institute , Daejon 34055, Republic of Korea ; leecu@kasi.re.krKorea Astronomy and Space Science Institute , Daejon 34055, Republic of Korea ; leecu@kasi.re.krDepartment of Particle Physics and Astrophysics, Weizmann Institute of Science , Rehovot 76100, IsraelCenter for Astrophysics, Harvard & Smithsonian, 60 Garden St. , Cambridge, MA 02138, USACenter for Astrophysics, Harvard & Smithsonian, 60 Garden St. , Cambridge, MA 02138, USADepartment of Astronomy and Tsinghua Centre for Astrophysics, Tsinghua University , Beijing 100084, People’s Republic of ChinaCenter for Astrophysics, Harvard & Smithsonian, 60 Garden St. , Cambridge, MA 02138, USA; Department of Astronomy and Tsinghua Centre for Astrophysics, Tsinghua University , Beijing 100084, People’s Republic of ChinaKorea Astronomy and Space Science Institute , Daejon 34055, Republic of Korea ; leecu@kasi.re.kr; School of Space Research, Kyung Hee University , Yongin, Kyeonggi 17104, Republic of KoreaDepartment of Physics, Chungbuk National University , Cheongju 28644, Republic of Korea ; cheongho@astroph.chungbuk.ac.krKorea Astronomy and Space Science Institute , Daejon 34055, Republic of Korea ; leecu@kasi.re.krKorea Astronomy and Space Science Institute , Daejon 34055, Republic of Korea ; leecu@kasi.re.krKorea Astronomy and Space Science Institute , Daejon 34055, Republic of Korea ; leecu@kasi.re.krKorea Astronomy and Space Science Institute , Daejon 34055, Republic of Korea ; leecu@kasi.re.kr; School of Space Research, Kyung Hee University , Yongin, Kyeonggi 17104, Republic of KoreaKorea Astronomy and Space Science Institute , Daejon 34055, Republic of Korea ; leecu@kasi.re.krDepartment of Astronomy, The Ohio State University , 140 W. 18th Ave., Columbus, OH 43210, USATo conduct a comprehensive demographic study of microlensing planets, it is essential to detect all planetary signals that exceed a predefined threshold through a detailed analysis of survey data. We reanalyzed previous data from the Korea Microlensing Telescope Network survey to search for weak planetary signals in lensing events involving faint source stars. For events with potential short-term anomalies identified in the initial search, we validated the signals using rereduced data and conducted detailed modeling of the anomalous events. This process led to the discovery of four planetary events: KMT-2017-BLG-2197, KMT-2022-BLG-1790, KMT-2022-BLG-2076, and KMT-2023-BLG-2209. For all these events, the modeling resulted in two solutions due to the well-known inner–outer degeneracy. The estimated masses of the planets and their hosts are approximately ( M _p / M _J , M _h / M _⊙ ) ∼ (0.36, 7.9) for KMT-2017-BLG-2197L, ∼(0.6, 1.7) for KMT-2022-BLG-1790L, ∼(0.67, 0.9) for KMT-2022-BLG-2076L, and ∼(0.73, 0.8) for KMT-2023-BLG-2209L. The planetary systems KMT-2017-BLG-2197L and KMT-2022-BLG-1790L are likely located in the Galactic bulge, while KMT-2022-BLG-2076L and KMT-2023-BLG-2209L are more likely situated in the disk.https://doi.org/10.3847/1538-3881/adc5e7Gravitational microlensing exoplanet detectionGravitational microlensing |
| spellingShingle | Cheongho Han Michael D. Albrow Chung-Uk Lee Sun-Ju Chung Andrew Gould Kyu-Ha Hwang Youn Kil Jung Yoon-Hyun Ryu Yossi Shvartzvald In-Gu Shin Jennifer C. Yee Hongjing Yang Weicheng Zang Sang-Mok Cha Doeon Kim Dong-Jin Kim Seung-Lee Kim Dong-Joo Lee Yongseok Lee Byeong-Gon Park Richard W. Pogge Four Planets Found through Microlensing Events Involving Faint Source Stars The Astronomical Journal Gravitational microlensing exoplanet detection Gravitational microlensing |
| title | Four Planets Found through Microlensing Events Involving Faint Source Stars |
| title_full | Four Planets Found through Microlensing Events Involving Faint Source Stars |
| title_fullStr | Four Planets Found through Microlensing Events Involving Faint Source Stars |
| title_full_unstemmed | Four Planets Found through Microlensing Events Involving Faint Source Stars |
| title_short | Four Planets Found through Microlensing Events Involving Faint Source Stars |
| title_sort | four planets found through microlensing events involving faint source stars |
| topic | Gravitational microlensing exoplanet detection Gravitational microlensing |
| url | https://doi.org/10.3847/1538-3881/adc5e7 |
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