13 papers
Masking Algorithm for CCD Bleeding in Korea Microlensing Telescope Network Images
Jiseop Shin, Mankeun Jeong, Myungshin Im +3
Astronomical CCD images are often affected by bleeding from bright sources, producing column-aligned streaks that degrade source detection and photometry. We present a pixel-level…
7DT Insight: Variability in Young Stellar Objects
Mi-Ryang Kim, Jeong-Eun Lee, Myungshin Im +11
Photometric variability in young stellar objects (YSOs) provides critical insight into the mechanisms of mass accretion, disk evolution, and circumstellar extinction in early stell…
KMTNet Synoptic Survey of Southern Sky III: The First Data Release
Seo-Won Chang, Myungshin Im, Mankeun Jeong +13
We present the first public data release (DR1) of the KMTNet Synoptic Survey of Southern Sky (KS4). This deep, wide-field imaging survey covers a southern footprint of -85$^{\circ}…
KMTNet Synoptic Survey of Southern Sky II: Data Reduction and Real-Time Transient Detection Pipeline
Mankeun Jeong, Myungshin Im, Joonho Kim +9
We present a comprehensive pipeline developed for the image processing of the KMTNet Synoptic Survey of the Southern Sky (KS4) Data Release 1. This pipeline encompasses several key…
A Hybrid Framework for Kilonova Anomaly Detection using Single-Epoch SEDs from the 7-Dimensional Telescope
Gregory S. H. Paek, Myungshin Im, Seo-Won Chang +2
We develop a hybrid framework to identify kilonovae (KNe), using single-epoch, medium-band spectral energy distributions from the 7-Dimensional Telescope (7DT). The framework integ…
Pre-perihelion Emergence of the CN Gas Coma in 3I/ATLAS Temporally and Spatially Resolved by the 7-Dimensional Telescope
Gregory S. H. Paek, Myungshin Im, Mankeun Jeong +8
We present time-series medium-band (R~20-40) observations of the third interstellar object 3I/ATLAS (C/2025 N1) obtained with the 7-Dimensional Telescope (7DT), enabling spatially…
The Redshifts from 122 Bands: Comparative Redshift Forecast for Low-Resolution Spectra from SPHEREx and 7-Dimensional Sky Survey (7DS)
Jangho Bae, Bomee Lee, Myungshin Im +21
The recently initiated SPHEREx and 7DS surveys will deliver low-resolution spectra () for hundreds of millions of galaxies over the optical to near-infrared range…
Investigating the Effects of Point Source Injection Strategies on KMTNet Real/Bogus Classification
Dongjin Lee, Gregory S. H. Paek, Seo-Won Chang +6
Recently, machine learning-based real/bogus (RB) classifiers have demonstrated effectiveness in filtering out artifacts and identifying genuine transients in real-time astronomical…
AllBRICQS: The Discovery of Luminous Quasars in the Northern Hemisphere
Yunyi Choi, Yuming Fu, Myungshin Im +16
We present the second catalog of bright quasars from the All-sky BRIght, Complete Quasar Survey (AllBRICQS), focusing on spectroscopically observed quasars in the Northern Hemisphe…
GECKO Follow-up Observation of the Binary Neutron Star-Black Hole Merger Candidate S230518h
Gregory S. H. Paek, Myungshin Im, Mankeun Jeong +12
The gravitational wave (GW) event S230518h is a potential binary neutron star-black hole merger (NSBH) event that was detected during engineering run 15 (ER15), which served as the…
Exploring Unobscured QSOs in the Southern Hemisphere with KS4
Yongjung Kim, Minjin Kim, Myungshin Im +7
We present a catalog of unobscured QSO candidates in the southern hemisphere from the early interim data of the KMTNet Synoptic Survey of Southern Sky (KS4). The KS4 data covers $\…
Project Management for Ground-based Telescope Array Development
Ji Hoon Kim, Myungshin Im, Hyung Mok Lee +1
Center for the Gravitational-Wave Universe at Seoul National University has been operating its main observational facility, the 7-Dimensional Telescope (7DT) since October 2023. Lo…
Introduction to the 7-Dimensional Telescope: Commissioning Procedures and Data Characteristics
Ji Hoon Kim, Myungshin Im, Hyung Mok Lee +3
The 7-Dimensional Telescope (7DT) is a multi-telescope system designed to identify electromagnetic (EM) counterparts of gravitational-wave (GW) sources. Consisting of 20 50-cm tele…