Explanipedia

A Comprehensive Analysis of Three Microlensing Planet Candidates with the Planet/Binary Degeneracy Open

Jiyuan Zhang, Weicheng Zang, Yoon-Hyun Ryu, T. Sumi, A. Udalski , et al. · 2025

We present observations and analyses of three high-magnification microlensing events: KMT-2022-BLG-0954, KMT-2024-BLG-0697, and MOA-2024-BLG-018. All three exhibit the “Planet/Binary” degeneracy, with planetary solutions corresponding to m…

Six microlensing planets detected via sub-day signals during the 2023 -- 2024 season Open

Cheongho Han, Chung‐Uk Lee, A. Udalski, I. A. Bond, Michael D. Albrow , et al. · 2025

We present analyses of six microlensing events: KMT-2023-BLG-0548, KMT-2023-BLG-0830, KMT-2023-BLG-0949, KMT-2024-BLG-1281, KMT-2024-BLG-2059, and KMT-2024-BLG-2242. These were identified in KMTNet data from the 2023 -- 2024 seasons, selec…

KMT-2022-BLG-0086: Another Binary-lens Binary-source Microlensing Event Open

Sun‐Ju Chung, Kyu‐Ha Hwang, Jennifer C. Yee, Andrew Gould, I. A. Bond , et al. · 2025

We present the analysis of a microlensing event KMT-2022-BLG-0086 of which the overall light curve is not described by a binary-lens single-source (2L1S) model, which suggests the existence of an extra lens or an extra source. We found tha…

HST pre-imaging of a free-floating planet candidate microlensing event Open

Mateusz Kapusta, P. Mróz, Yoon-Hyun Ryu, A. Udalski, S. Kozłowski , et al. · 2025

High-cadence microlensing observations uncovered a population of very short-timescale microlensing events, which are believed to be caused by the population of free-floating planets (FFP) roaming the Milky Way. Unfortunately, the light cur…

KMT-2022-BLG-0086: Another binary-lens binary-source microlensing event Open

Sun‐Ju Chung, Kyu‐Ha Hwang, Jennifer C. Yee, Andrew Gould, I. A. Bond , et al. · 2025

We present the analysis of a microlensing event KMT-2022-BLG-0086 of which the overall light curve is not described by a binary-lens single-source (2L1S) model, which suggests the existence of an extra lens or an extra source. We found tha…

MOA-2022-BLG-091Lb and KMT-2024-BLG-1209Lb: Microlensing planets detected through weak caustic-crossing signals Open

Cheongho Han, Chung‐Uk Lee, A. Udalski, I. A. Bond, Hongjing Yang , et al. · 2025

Aims . The light curves of the microlensing events MOA-2022-BLG-091 and KMT-2024-BLG-1209 exhibit anomalies with very similar features. These anomalies appear near the peaks of the light curves, where the magnifications are moderately high…

MOA-2022-BLG-091Lb and KMT-2024-BLG-1209Lb: Microlensing planets detected through weak caustic-crossing signals Open

Cheongho Han, I. A. Bond, Michael D. Albrow, Sun‐Ju Chung, Andrew Gould , et al. · 2025

The light curves of the microlensing events MOA-2022-BLG-091 and KMT-2024-BLG-1209 exhibit anomalies with very similar features. These anomalies appear near the peaks of the light curves, where the magnifications are moderately high, and a…

Systematic Reanalysis of KMTNet Microlensing Events. II. Two New Planets in Giant-source Events Open

Hongjing Yang, Jennifer C. Yee, Jiyuan Zhang, Chung‐Uk Lee, Dong-Jin Kim , et al. · 2025

In this work, we continue to apply the updated KMTNet tender-love care photometric pipeline to historical microlensing events. We apply the pipeline to a subsample of events from the KMTNet database, which we refer to as the giant source s…

Four Planets Found through Microlensing Events Involving Faint Source Stars Open

Cheongho Han, Michael D. Albrow, Chung‐Uk Lee, Sun‐Ju Chung, Andrew Gould , et al. · 2025

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 events indicate that super-Earth exoplanets are common in Jupiter-like orbits Open

Weicheng Zang, Youn Kil Jung, Jennifer C. Yee, Kyu‐Ha Hwang, Hongjing Yang , et al. · 2025

Exoplanets classified as super-Earths are commonly observed on short-period orbits, close to their host stars, but their abundance on wider orbits is poorly constrained. Gravitational microlensing is sensitive to exoplanets on wide orbits.…

KMTNet View of Blue Large-amplitude Pulsators Toward the Galactic Bulge. I. Discovery of Wide-orbit Companions in OGLE-BLAP-006 Open

Seung‐Lee Kim, Chung‐Uk Lee, Kyeongsoo Hong, Jae Woo Lee, Dong-Jin Kim , et al. · 2025

Blue large-amplitude pulsators (BLAPs), a recently classified type of variable stars, are evolved objects likely formed through interactions between stars in a binary system. However, only two BLAPs with stellar companions have been discov…

Analyses of anomalous lensing events detected from the UKIRT microlensing survey Open

Cheongho Han, Weicheng Zang, A. Udalski, Chung‐Uk Lee, I. A. Bond , et al. · 2025

Aims. The United Kingdom Infrared Telescope (UKIRT) microlensing survey was conducted over four years, from 2016 to 2019, with the goal of serving as a precursor to future near-infrared microlensing surveys. Focusing on stars in the Galact…

Analyses of anomalous lensing events detected from the UKIRT microlensing survey Open

Cheongho Han, Weicheng Zang, A. Udalski, Chung‐Uk Lee, I. A. Bond , et al. · 2025

The United Kingdom Infrared Telescope (UKIRT) microlensing survey was conducted over four years, from 2016 to 2019, with the goal of serving as a precursor to future near-infrared microlensing surveys (Shvartzvald et al. 2017). Focusing on…

LensNet: Enhancing Real-time Microlensing Event Discovery with Recurrent Neural Networks in the Korea Microlensing Telescope Network Open

Javier Viaña, Kyu‐Ha Hwang, Zoë L. de Beurs, Jennifer C. Yee, Andrew Vanderburg , et al. · 2025

Traditional microlensing event vetting methods require highly trained human experts, and the process is both complex and time consuming. This reliance on manual inspection often leads to inefficiencies and constrains the ability to scale f…

Observations of Microlensed Images with Dual-field Interferometry: On-sky Demonstration and Prospects Open

P. Mróz, Subo Dong, A. Mérand, J. Shangguan, J. Woillez , et al. · 2025

Interferometric observations of gravitational microlensing events offer an opportunity for precise, efficient, and direct mass and distance measurements of lensing objects, especially those of isolated neutron stars and black holes. Howeve…

MOA-2022-BLG-033Lb, KMT-2023-BLG-0119Lb, and KMT-2023-BLG-1896Lb: Three low mass-ratio microlensing planets detected through dip signals Open

Cheongho Han, A. Bond, Youn Kil Jung, D. Michael Albrow, Sun‐Ju Chung , et al. · 2025

Aims . We examined the anomalies in the light curves of the lensing events MOA-2022-BLG-033, KMT-2023-BLG-0119, and KMT- 2023-BLG-1896. These anomalies share similar traits: they occur near the peak of moderately to highly magnified events…

MOA-2022-BLG-033Lb, KMT-2023-BLG-0119Lb, and KMT-2023-BLG-1896Lb: Three low mass-ratio microlensing planets detected through dip signals Open

Cheongho Han, I. A. Bond, Youn Kil Jung, Michael D. Albrow, Sun‐Ju Chung , et al. · 2025

We examined the anomalies in the light curves of the lensing events MOA-2022-BLG-033, KMT-2023-BLG-0119, and KMT-2023-BLG-1896. We conducted detailed modeling of the light curves to uncover the nature of the anomalies. This modeling reveal…

Geninpsection: Toward Generalizable Anomaly Detection Open

Geonu Lee, Seung Min Lee, Ji‐Soo Song, Sang-Mok Cha, Youngjoon Yoo · 2025

KMT-2021-BLG-0284, KMT-2022-BLG-2480, and KMT-2024-BLG-0412: Three microlensing events involving two lens masses and two source stars Open

Cheongho Han, A. Udalski, I. A. Bond, Chung‐Uk Lee, Andrew Gould , et al. · 2024

We carried out a project involving the systematic analysis of microlensing data from the Korea Microlensing Telescope Network survey. The aim of this project is to identify lensing events with complex anomaly features that are difficult to…

Analysis of the Full Spitzer Microlensing Sample. I. Dark Remnant Candidates and Gaia Predictions Open

Krzysztof A. Rybicki, Yossi Shvartzvald, Jennifer C. Yee, S. Calchi Novati, E. O. Ofek , et al. · 2024

In the pursuit of understanding the population of stellar remnants within the Milky Way, we analyze the sample of ∼950 microlensing events observed by the Spitzer Space Telescope between 2014 and 2019. In this study we focus on a subsample…

KMT-2023-BLG-2669: Ninth Free-floating Planet Candidate with θ <sub>E</sub> Measurements Open

Youn Kil Jung, Kyu‐Ha Hwang, Hongjing Yang, Andrew Gould, Jennifer C. Yee , et al. · 2024

We report a free-floating planet (FFP) candidate identified from the analysis of the microlensing event KMT-2023-BLG-2669. The lensing light curve is characterized by a short duration (≲3 days) and a small amplitude (≲0.7 mag). From the an…

Microlensing brown-dwarf companions in binaries detected during the 2022 and 2023 seasons Open

Cheongho Han, I. A. Bond, A. Udalski, Chung‐Uk Lee, Andrew Gould , et al. · 2024

Aims. Building on previous works to construct a homogeneous sample of brown dwarfs in binary systems, we investigate microlensing events detected by the Korea Microlensing Telescope Network (KMTNet) survey during the 2022 and 2023 seasons.…

Microlensing brown-dwarf companions in binaries detected during the 2022 and 2023 seasons Open

Cheongho Han, I. A. Bond, A. Udalski, Chung‐Uk Lee, Andrew Gould , et al. · 2024

Building on previous works to construct a homogeneous sample of brown dwarfs in binary systems, we investigate microlensing events detected by the Korea Microlensing Telescope Network (KMTNet) survey during the 2022 and 2023 seasons. Given…

KMT-2021-BLG-2609Lb and KMT-2022-BLG-0303Lb: Microlensing planets identified through signals produced by major-image perturbations Open

Cheongho Han, Michael D. Albrow, Chung‐Uk Lee, Sun‐Ju Chung, Andrew Gould , et al. · 2024

Aims. We investigate microlensing data collected by the Korea Microlensing Telescope Network (KMTNet) survey during the 2021 and 2022 seasons to identify planetary lensing events displaying a consistent anomalous pattern. Our investigation…

Analysis of the full Spitzer microlensing sample I: Dark remnant candidates and Gaia predictions Open

Krzysztof A. Rybicki, Yossi Shvartzvald, Jennifer C. Yee, S. Calchi Novati, E. O. Ofek , et al. · 2024

In the pursuit of understanding the population of stellar remnants within the Milky Way, we analyze the sample of $\sim 950$ microlensing events observed by the Spitzer Space Telescope between 2014 and 2019. In this study we focus on a sub…

Systematic KMTNet Planetary Anomaly Search. XII. Complete Sample of 2017 Subprime Field Planets Open

Yuqian Gui, Weicheng Zang, Ruocheng Zhai, Yoon-Hyun Ryu, A. Udalski , et al. · 2024

We report the analysis of four unambiguous planets and one possible planet from the subprime fields (Γ ≤ 1 hr −1 ) of the 2017 Korea Microlensing Telescope Network (KMTNet) microlensing survey, to complete the KMTNet AnomalyFinder planetar…

KMT-2023-BLG-1866Lb: Microlensing super-Earth around an M dwarf host Open

Cheongho Han, I. A. Bond, A. Udalski, Chung‐Uk Lee, Andrew Gould , et al. · 2024

Aims. We aim to investigate the nature of the short-term anomaly that appears in the lensing light curve of KMT-2023-BLG-1866. The anomaly was only partly covered due to its short duration of less than a day, coupled with cloudy weather co…

Four microlensing giant planets detected through signals produced by minor-image perturbations Open

Cheongho Han, I. A. Bond, Chung‐Uk Lee, Andrew Gould, Michael D. Albrow , et al. · 2024

Aims. We investigated the nature of the anomalies appearing in four microlensing events KMT-2020-BLG-0757, KMT-2022-BLG-0732, KMT-2022-BLG-1787, and KMT-2022-BLG-1852. The light curves of these events commonly exhibit initial bumps followe…

Four microlensing giant planets detected through signals produced by minor-image perturbations Open

Cheongho Han, I. A. Bond, Chung‐Uk Lee, Andrew Gould, Michael D. Albrow , et al. · 2024

We investigated the nature of the anomalies appearing in four microlensing events KMT-2020-BLG-0757, KMT-2022-BLG-0732, KMT-2022-BLG-1787, and KMT-2022-BLG-1852. The light curves of these events commonly exhibit initial bumps followed by s…

Erratum: “Photometric Selection of Unobscured QSOs at the Ecliptic Poles: KMTNet in the South Field and Pan-STARRS in the North Field” (2023, ApJS, 268, 57) Open

Woowon Byun, Minjin Kim, Yun‐Kyeong Sheen, Dongseob Lee, Luis C. Ho , et al. · 2024

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