activity
20162025
most citedThe Exoplanet Mass-Ratio Function from the MOA-II Survey: Discovery of a Break and Likely Peak at a Neptune Mass

278 citations · 478 across the 27 of their papers we have counts for

collaborators

27 papers

astro-ph.EP2025

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

Jiyuan Zhang, Weicheng Zang, Yoon-Hyun Ryu +65

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/Bina…

astro-ph.EP2025

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

Cheongho Han, Chung-Uk Lee, Andrzej Udalski +58

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 ide…

astro-ph.SR2025

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

Sun-Ju Chung, Kyu-Ha Hwang, Jennifer C. Yee +40

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…

astro-ph.EP2025

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

Cheongho Han, Chung-Uk Lee, Andrzej Udalski +66

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…

astro-ph.EP20251 cited

KMT-2022-BLG-1818Lb,c: A Cold Super-Jupiter with a Saturn Sibling

Hongyu Li, Jiyuan Zhang, Cheongho Han +72

We present the discovery and analysis of the sixth microlensing two-planet system, KMT-2022-BLG-1818Lb,c, detected by a follow-up program targeting high-magnification events. Both…

astro-ph.EP202538 cited

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

Weicheng Zang, Youn Kil Jung, Jennifer C. Yee +65

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. Gravitatio…