KMT-2018-BLG-1988Lb: Microlensing super-Earth orbiting a low-mass disk dwarf

Han, Cheongho; Gould, Andrew; Albrow, Michael D.; Chung, Sun-Ju; Hwang, Kyu-Ha; Jung, Youn Kil; Kim, Doeon; Lee, Chung-Uk; Ryu, Yoon-Hyun; Shin, In-Gu; Shvartzvald, Yossi; Yee, Jennifer C.; Zang, Weicheng; Cha, Sang-Mok; Kim, Dong-Jin; Kim, Hyoun-Woo; Lee, Dong-Joo; Lee, Yongseok; Park, Byeong-Gon; Pogge, Richard W.; Kim, Chun-Hwey

doi:10.1051/0004-6361/202142077

Cited by 8 publications

(5 citation statements)

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“…However, of the 12 dip-type anomalies, 9 were solely detected by AnomalyFinder, including 8 non-caustic-crossing anomalies. KMT-2018-BLG-1988(Han et al 2022a) is the only case that the anomaly is a non-caustic-crossing dip and was first discovered from by-eye searches. Unlike the dip-type anomalies, the four non-caustic-crossing bumps were all first noticed However, there is no planet located at the left lower corner of Figure 15, with |u 0,limit | = 0.0060 and |u anom,limit | = 0.0158.…”

Section: The Missing Planetary Caustics Problemmentioning

confidence: 99%

Systematic KMTNet Planetary Anomaly Search. VII. Complete Sample of q < 10⁻⁴ Planets from the First 4 yr Survey

Zang

Jung

Yang

et al. 2023

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We present the analysis of seven microlensing planetary events with planet/host mass ratios q < 10−4: KMT-2017-BLG-1194, KMT-2017-BLG-0428, KMT-2019-BLG-1806, KMT-2017-BLG-1003, KMT-2019-BLG-1367, OGLE-2017-BLG-1806, and KMT-2016-BLG-1105. They were identified by applying the Korea Microlensing Telescope Network (KMTNet) AnomalyFinder algorithm to 2016–2019 KMTNet events. A Bayesian analysis indicates that all the lens systems consist of a cold super-Earth orbiting an M or K dwarf. Together with 17 previously published and three that will be published elsewhere, AnomalyFinder has found a total of 27 planets that have solutions with q < 10−4 from 2016–2019 KMTNet events, which lays the foundation for the first statistical analysis of the planetary mass-ratio function based on KMTNet data. By reviewing the 27 planets, we find that the missing planetary caustics problem in the KMTNet planetary sample has been solved by AnomalyFinder. We also find a desert of high-magnification planetary signals (A ≳ 65), and a follow-up project for KMTNet high-magnification events could detect at least two more q < 10−4 planets per year and form an independent statistical sample.

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Section: The Missing Planetary Caustics Problemmentioning

confidence: 99%

Systematic KMTNet Planetary Anomaly Search. VII. Complete Sample of q < 10⁻⁴ Planets from the First 4 yr Survey

Zang

Jung

Yang

et al. 2023

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“…The number of super-Earth planets detected by microlensing is rapidly increasing thanks to the onset of high-cadence surveys. The microlensing planets with M 10 M ⊕ are listed in Table 3 of Han et al (2022). With an additional planet, KMT-2020-BLG-0414LAbB (Zang et al 2021), which was detected after the publication of Han et al (2022), there exist 19 super-Earth microlensing planets with M 10 M ⊕ , including the one we report here.…”

Section: Physical Parametersmentioning

confidence: 66%

“…The microlensing planets with M 10 M ⊕ are listed in Table 3 of Han et al (2022). With an additional planet, KMT-2020-BLG-0414LAbB (Zang et al 2021), which was detected after the publication of Han et al (2022), there exist 19 super-Earth microlensing planets with M 10 M ⊕ , including the one we report here. Among these planets, 16 planets were detected during the last 6 yr after the full operation of the KMTNet survey.…”

Section: Physical Parametersmentioning

confidence: 66%

“… KMT-2016-BLG-0212 (Hwang et al 2018a ,KMT-2016-BLG- 1105(Zang et al 2023), OGLE-2016-BLG-1195(Shvartzvald et al 2017,KMT-2017-BLG-1003(Zang et al 2023, KMT-2017-BLG-0428(Zang et al 2023),KMT-2017-BLG-1194(Zang et al 2023, OGLE-2017-BLG-0173(Hwang et al 2018b), OGLE-2017-BLG-1434(Udalski et al 20118), OGLE-2017-BLG-1691(Han et al 2022c), OGLE-2017-BLG-1806(Zang et al 2023), KMT-2018-BLG-0029(Gould et al 2020),KMT-2018-BLG-1025(Han et al 2021,KMT-2018-BLG-1988(Han et al 2022a), OGLE-2018-BLG-0506(Hwang et al 2022), OGLE-2018-BLG-0532(Ryu et al 2020), OGLE-2018-BLG-0977(Hwang et al 2022), OGLE-2018-BLG-1185(Kondo et al 2021), OGLE-2018-BLG-1126(Gould et al 2022, KMT-2019-BLG-0253(Hwang et al 2022), KMT-2019-BLG-0842(Jung et al 2020),KMT-2019-BLG-1367(Zang et al 2023, KMT-…”

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confidence: 99%

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KMT-2021-BLG-0912Lb: a microlensing super Earth around a K-type star

Han

Bond

Yee

et al. 2022

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Aims. The light curve of the microlensing event KMT-2021-BLG-0912 exhibits a very short anomaly relative to a single-lens single-source form. We investigate the light curve for the purpose of identifying the origin of the anomaly. Methods. We model the light curve under various interpretations. From this, we find four solutions, in which three solutions are found underthe assumption that the lens is composed of two masses (2L1S models), and the other solution is found under the assumption that the source is comprised of binary stars (1L2S model). The 1L2S model is ruled out based on the contradiction that the faint source companion is bigger than its primary, and one of the 2L1S solutions is excluded from the combination of the poorer fit, blending constraint, and lower overall probability, leaving two surviving solutions with the planet/host mass ratios of q ~ 2.8 × 10−5 and ~ 1.1 × 10−5. A subtle central deviation supports the possibility of a tertiary lens component, either a binary companion to the host with a very large or small separation, or a second planet lying near the Einstein ring, but it is difficult to claim a secure detection due to the marginal improvement of the fit, lack of consistency among different data sets, and difficulty in uniquely specifying the nature of the tertiary component. Results. With the observables of the event, it is estimated that the masses of the planet and host are ~ (6.9 M⊕, 0.75 M⊙) according to one solution and~(2.8 M⊕, 0.80 M⊙) according to the other, indicating that the planet is a super Earth around a K-type star, regardless of the solution. The fact that 16 (including the one reported in this work) out of 19 microlensing planets with M ≲ 10 M⊕ were detected during the last 6 yr nicely demonstrates the importance of high-cadence global surveys in detecting very low-mass planets.

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“…Han et al (2021b) additionally identified 3 planets (KMT-2017-BLG-2509Lb, OGLE-2017-BLG-1099Lb, and OGLE-2019 detected via resonant-caustic channels. Han et al (2022) reexamined high-magnification microlensing events in the 2018 season data and found 1 planet (KMT-2018) with a very shortduration planetary signal.…”

Section: Introductionmentioning

confidence: 99%

KMT-2017-BLG-0673Lb and KMT-2019-BLG-0414Lb: Two microlensing planets detected in peripheral fields of KMTNet survey

Han

Lee

Gould

et al. 2022

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Aims. We investigate the microlensing data collected during the 2017-2019 seasons in the peripheral Galactic bulge fields with the aim of finding planetary signals in microlensing light curves observed with relatively sparse coverage. Methods. We first sort out lensing events with weak short-term anomalies in the lensing light curves from the visual inspection of all non-prime-field events, and then test various interpretations of the anomalies. From this procedure, we find two previously unidentified candidate planetary lensing events KMT-2017-BLG-0673 and KMT-2019-BLG-0414. It is found that the planetary signal of KMT-2017-BLG-0673 was produced by the source crossing over a planet-induced caustic, but it was previously missed because of the sparse coverage of the signal. On the other hand, the possibly planetary signal of KMT-2019-BLG-0414 was generated without caustic crossing, and it was previously missed due to the weakness of the signal. We identify a unique planetary solution for KMT-2017-BLG-0673. However, for KMT-2019-BLG-0414, we identify two pairs of planetary solutions, for each of which there are two solutions caused by the close-wide degeneracy, and a slightly less favored binary-source solution, in which a single lens mass gravitationally magnified a rapidly orbiting binary source with a faint companion (xallarap). Results. From Bayesian analyses, it is estimated that the planet KMT-2017-BLG-0673Lb has a mass of 3.7 +2.2 −2.1 M J , and it is orbiting a late K-type host star with a mass of 0.63 +0.37 −0.35 M ⊙ . Under the planetary interpretation of KMT-2010-BLG-0414L, a star with a mass of 0.74 +0.43 −0.38 M ⊙ hosts a planet with a mass of ∼ 3.2-3.6 M J depending on the solution. We discuss the possible resolution of the planet-xallarap degeneracy of KMT-2019-BLG-0414 by future adaptive-optics observations on 30 m class telescopes. The detections of the planets indicate the need for thorough investigations of non-prime-field lensing events for the complete census of microlensing planet samples.

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KMT-2018-BLG-1988Lb: Microlensing super-Earth orbiting a low-mass disk dwarf

Cited by 8 publications

References 50 publications

Systematic KMTNet Planetary Anomaly Search. VII. Complete Sample of q < 10⁻⁴ Planets from the First 4 yr Survey

Systematic KMTNet Planetary Anomaly Search. VII. Complete Sample of q < 10⁻⁴ Planets from the First 4 yr Survey

KMT-2021-BLG-0912Lb: a microlensing super Earth around a K-type star

KMT-2017-BLG-0673Lb and KMT-2019-BLG-0414Lb: Two microlensing planets detected in peripheral fields of KMTNet survey

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KMT-2018-BLG-1988Lb: Microlensing super-Earth orbiting a low-mass disk dwarf

Cited by 8 publications

References 50 publications

Systematic KMTNet Planetary Anomaly Search. VII. Complete Sample of q < 10−4 Planets from the First 4 yr Survey

Systematic KMTNet Planetary Anomaly Search. VII. Complete Sample of q < 10−4 Planets from the First 4 yr Survey

KMT-2021-BLG-0912Lb: a microlensing super Earth around a K-type star

KMT-2017-BLG-0673Lb and KMT-2019-BLG-0414Lb: Two microlensing planets detected in peripheral fields of KMTNet survey

Contact Info

Product

Resources

About

Systematic KMTNet Planetary Anomaly Search. VII. Complete Sample of q < 10⁻⁴ Planets from the First 4 yr Survey

Systematic KMTNet Planetary Anomaly Search. VII. Complete Sample of q < 10⁻⁴ Planets from the First 4 yr Survey