Kmt-2022-Blg-0440lb: A New q < 10−4 Microlensing Planet With the Central-Resonant Caustic Degeneracy Broken
We present the observations and analysis of a high-magnification microlensing planetary event, KMT-2022-BLG-0440, for which the weak and short-lived planetary signal was covered by both the KMTNet survey and follow-up observations. The binary-lens models with a central caustic provide the best fits,...
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Published in | Monthly notices of the Royal Astronomical Society Vol. 522; no. 4; pp. 6055 - 6069 |
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Main Authors | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
Format | Journal Article |
Language | English |
Published |
Goddard Space Flight Center
Oxford University Press (United Kingdom)
11.05.2023
Oxford University Press |
Subjects | |
Online Access | Get full text |
ISSN | 0035-8711 1365-2966 |
DOI | 10.1093/mnras/stad1398 |
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Abstract | We present the observations and analysis of a high-magnification microlensing planetary event, KMT-2022-BLG-0440, for which the weak and short-lived planetary signal was covered by both the KMTNet survey and follow-up observations. The binary-lens models with a central caustic provide the best fits, with a planet/host mass ratio, q = 0.75–1.00 ×10−4 at 1 σ. The binary-lens models with a resonant caustic and a brown-dwarf mass ratio are both excluded by ∆χ2 > 70. The binary-source model can fit the anomaly well but is rejected by the ‘colour argument’ on the second source. From Bayesian analyses, it is estimated that the host star is likely a K or M dwarf located in the Galactic disc, the planet probably has a Neptune-mass, and the projected planet-host separation is 1.9+0.6−0.7 or 4.6+1.4−1.7 au, subject to the close/wide de generac y. This is the third q < 10−4 planet from a high-magnification planetary signal ( A ≳ 65). Together with another such planet, KMT-2021-BLG-0171Lb, the ongoing follow-up program for the KMTNet high-magnification events has demonstrated its ability to detect high-magnification planetary signals for q < 10−4 planets, which are challenging for the current microlensing surveys. |
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AbstractList | We present the observations and analysis of a high-magnification microlensing planetary event, KMT-2022-BLG-0440, for which the weak and short-lived planetary signal was covered by both the KMTNet survey and follow-up observations. The binary-lens models with a central caustic provide the best fits, with a planet/host mass ratio, q = 0.75–1.00 ×10−4 at 1 σ. The binary-lens models with a resonant caustic and a brown-dwarf mass ratio are both excluded by ∆χ2 > 70. The binary-source model can fit the anomaly well but is rejected by the ‘colour argument’ on the second source. From Bayesian analyses, it is estimated that the host star is likely a K or M dwarf located in the Galactic disc, the planet probably has a Neptune-mass, and the projected planet-host separation is 1.9+0.6−0.7 or 4.6+1.4−1.7 au, subject to the close/wide de generac y. This is the third q < 10−4 planet from a high-magnification planetary signal ( A ≳ 65). Together with another such planet, KMT-2021-BLG-0171Lb, the ongoing follow-up program for the KMTNet high-magnification events has demonstrated its ability to detect high-magnification planetary signals for q < 10−4 planets, which are challenging for the current microlensing surveys. We present the observations and analysis of a high-magnification microlensing planetary event, KMT-2022-BLG-0440, for which the weak and short-lived planetary signal was covered by both the KMTNet survey and follow-up observations. The binary-lens models with a central caustic provide the best fits, with a planet/host mass ratio, q = 0.75–1.00 × 10−4 at 1σ. The binary-lens models with a resonant caustic and a brown-dwarf mass ratio are both excluded by Δχ2 > 70. The binary-source model can fit the anomaly well but is rejected by the ‘colour argument’ on the second source. From Bayesian analyses, it is estimated that the host star is likely a K or M dwarf located in the Galactic disc, the planet probably has a Neptune-mass, and the projected planet-host separation is $1.9^{+0.6}_{-0.7}$ or $4.6^{+1.4}_{-1.7}$ au, subject to the close/wide degeneracy. This is the third q < 10−4 planet from a high-magnification planetary signal (A ≳ 65). Together with another such planet, KMT-2021-BLG-0171Lb, the ongoing follow-up program for the KMTNet high-magnification events has demonstrated its ability to detect high-magnification planetary signals for q < 10−4 planets, which are challenging for the current microlensing surveys. ABSTRACT We present the observations and analysis of a high-magnification microlensing planetary event, KMT-2022-BLG-0440, for which the weak and short-lived planetary signal was covered by both the KMTNet survey and follow-up observations. The binary-lens models with a central caustic provide the best fits, with a planet/host mass ratio, q = 0.75–1.00 × 10−4 at 1σ. The binary-lens models with a resonant caustic and a brown-dwarf mass ratio are both excluded by Δχ2 > 70. The binary-source model can fit the anomaly well but is rejected by the ‘colour argument’ on the second source. From Bayesian analyses, it is estimated that the host star is likely a K or M dwarf located in the Galactic disc, the planet probably has a Neptune-mass, and the projected planet-host separation is $1.9^{+0.6}_{-0.7}$ or $4.6^{+1.4}_{-1.7}$ au, subject to the close/wide degeneracy. This is the third q < 10−4 planet from a high-magnification planetary signal (A ≳ 65). Together with another such planet, KMT-2021-BLG-0171Lb, the ongoing follow-up program for the KMTNet high-magnification events has demonstrated its ability to detect high-magnification planetary signals for q < 10−4 planets, which are challenging for the current microlensing surveys. |
Audience | PUBLIC |
Author | Mao, Shude Pogge, Richard W Silva, Stela Ishitani Cha, Sang-Mok Yee, Jennifer C Kim, Dong-Jin Jung, Youn Kil Albrow, Michael D Zhang, Jiyuan Zhu, Wei Kim, Seung-Lee Sumi, Takahiro Shvartzvald, Yossi Ryu, Yoon-Hyun Gould, Andrew Maoz, Dan Lee, Dong-Joo Barry, Richard Abe, Fumio Olmschenk, Greg Vandorou, Aikaterini Koshimoto, Naoki Zang, Weicheng Han, Cheongho Bennett, David P Lee, Chung-Uk Qian, Qiyue Lee, Yongseok Penny, Matthew T Bond, Ian A Yang, Hongjing Liu, Zhuokai Dong, Subo Park, Byeong-Gon Chung, Sun-Ju Kim, Hyoun-Woo Shin, In-Gu Hwang, Kyu-Ha Bhattacharya, Aparna |
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CorporateAuthor | The MAP, and μFUN Follow-up Teams Leading Authors The KMTNet Collaboration The MOA Collaboration |
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Keywords | Gravitational Lensing: Micro Planets And Satellites: Detection gravitational lensing: micro planets and satellites: detection |
Language | English |
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Snippet | We present the observations and analysis of a high-magnification microlensing planetary event, KMT-2022-BLG-0440, for which the weak and short-lived planetary... ABSTRACT We present the observations and analysis of a high-magnification microlensing planetary event, KMT-2022-BLG-0440, for which the weak and short-lived... |
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SubjectTerms | Astronomy |
Title | Kmt-2022-Blg-0440lb: A New q < 10−4 Microlensing Planet With the Central-Resonant Caustic Degeneracy Broken |
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