Hyung Mok Lee
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View article: Formation and Evolution of Compact Binaries Containing Intermediate-mass Black Holes in Dense Star Clusters
Formation and Evolution of Compact Binaries Containing Intermediate-mass Black Holes in Dense Star Clusters Open
We investigate the evolution of star clusters containing intermediate-mass black holes (IMBHs) of 300–5000 M ⊙ , focusing on the formation and evolution of IMBH–stellar-mass black hole (M BH ≲ 10 2 M ⊙ ) binaries. Dense stellar systems lik…
View article: External Attention Transformer: A Robust AI Model for Identifying Initial Eccentricity Signatures in Binary Black Hole Events in Simulated Advanced LIGO Data
External Attention Transformer: A Robust AI Model for Identifying Initial Eccentricity Signatures in Binary Black Hole Events in Simulated Advanced LIGO Data Open
Initial orbital eccentricities of gravitational wave (GW) events associated with merging binary black holes (BBHs) should provide clues to their formation scenarios, mainly because various BBH formation channels predict distinct eccentrici…
View article: Detection of unresolved strongly lensed supernovae with the 7-Dimensional Telescope
Detection of unresolved strongly lensed supernovae with the 7-Dimensional Telescope Open
Gravitationally lensed supernovae (glSNe) are a powerful tool for exploring the realms of astronomy and cosmology. Time-delay measurements and the lens modeling of glSNe can provide a robust and independent method for constraining the expa…
View article: GECKO Follow-up Observations of the Binary Neutron Star–Black Hole Merger Candidate S230518h
GECKO Follow-up Observations of the Binary Neutron Star–Black Hole Merger Candidate S230518h Open
The gravitational-wave (GW) event S230518h is a potential binary neutron star–black hole merger (NSBH) event that was detected during engineering run 15, which served as the commissioning period before the LIGO–Virgo–KAGRA O4a observing ru…
View article: GECKO Follow-up Observation of the Binary Neutron Star-Black Hole Merger Candidate S230518h
GECKO Follow-up Observation of the Binary Neutron Star-Black Hole Merger Candidate S230518h Open
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 commissioning period before the LIGO-Virgo-KAGRA (LVK) O4a…
View article: Detection of Unresolved Strongly Lensed Supernovae with 7-Dimensional Telescope
Detection of Unresolved Strongly Lensed Supernovae with 7-Dimensional Telescope Open
Gravitationally lensed supernovae (glSNe) are a powerful tool for exploring the realms of astronomy and cosmology. Time-delay measurements and lens modeling of glSNe can provide a robust and independent method for constraining the expansio…
View article: The Advantage of Early Detection and Localization from Eccentricity-Induced Higher Harmonic Modes in Second-Generation Ground-Based Detector Networks
The Advantage of Early Detection and Localization from Eccentricity-Induced Higher Harmonic Modes in Second-Generation Ground-Based Detector Networks Open
Early detection and localization of gravitational waves (GWs) are crucial for identifying and capturing their electromagnetic (EM) counterparts, playing a significant role in multi-messenger astronomy. For second-generation (2G) detectors …
View article: General relativistic self-gravitating equilibrium discs around rotating neutron stars
General relativistic self-gravitating equilibrium discs around rotating neutron stars Open
In modelling a relativistic disc around a compact object, the self-gravity of the disc is often neglected while it needs to be incorporated for more accurate descriptions in several circumstances. Extending the Komatsu–Eriguchi–Hachisu sel…
View article: Lowering threshold of NaI(Tl) scintillator to 0.7 keV in the COSINE-100 experiment
Lowering threshold of NaI(Tl) scintillator to 0.7 keV in the COSINE-100 experiment Open
COSINE-100 is a direct dark matter search experiment, with the primary goal of testing the annual modulation signal observed by DAMA/LIBRA, using the same target material, NaI(Tl). In previous analyses, we achieved the same 1 keV energy th…
View article: Introduction to the 7-Dimensional Telescope: Commissioning Procedures and Data Characteristics
Introduction to the 7-Dimensional Telescope: Commissioning Procedures and Data Characteristics Open
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 telescopes along with 40 medium-band filters of 25 nm width, 7D…
View article: Project Management for Ground-based Telescope Array Development
Project Management for Ground-based Telescope Array Development Open
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. Located at El Sauce Observatory in Chilean Rio Hurtado Valley…
View article: General relativistic self-gravitating equilibrium disks around rotating neutron stars
General relativistic self-gravitating equilibrium disks around rotating neutron stars Open
In modeling a relativistic disk around a compact object, the self-gravity of the disk is often neglected while it needs to be incorporated for more accurate descriptions in several circumstances. Extending the Komatsu-Eriguchi-Hachisu self…
View article: A Superconducting Tensor Detector for Mid-Frequency Gravitational Waves: Its Multichannel Nature and Main Astrophysical Targets
A Superconducting Tensor Detector for Mid-Frequency Gravitational Waves: Its Multichannel Nature and Main Astrophysical Targets Open
Mid-frequency band gravitational-wave detectors will be complementary to the existing Earth-based detectors (sensitive above 10 Hz or so) and the future space-based detectors such as the Laser Interferometer Space Antenna (LISA), which wil…
View article: Gravitational-wave Electromagnetic Counterpart Korean Observatory (GECKO): GECKO Follow-up Observation of GW190425
Gravitational-wave Electromagnetic Counterpart Korean Observatory (GECKO): GECKO Follow-up Observation of GW190425 Open
One of the keys to the success of multimessenger astronomy is the rapid identification of the electromagnetic wave counterpart, kilonova (KN), of the gravitational-wave (GW) event. Despite its importance, it is hard to find a KN associated…
View article: A superconducting tensor detector for mid-frequency gravitational waves: its multi-channel nature and main astrophysical targets
A superconducting tensor detector for mid-frequency gravitational waves: its multi-channel nature and main astrophysical targets Open
Mid-frequency band gravitational-wave detectors will be complementary for the existing Earth-based detectors (sensitive above 10 Hz or so) and the future space-based detectors such as LISA, which will be sensitive below around 10 mHz. A gr…
View article: Gravitational-wave Electromagnetic Counterpart Korean Observatory (GECKO): GECKO Follow-up Observation of GW190425
Gravitational-wave Electromagnetic Counterpart Korean Observatory (GECKO): GECKO Follow-up Observation of GW190425 Open
One of the keys to the success of multimessenger astronomy is the rapid identification of the electromagnetic wave counterpart, kilonova (KN), of the gravitational-wave (GW) event. Despite its importance, it is hard to find a KN associated…
View article: Eccentricity enables the earliest warning and localization of gravitational waves with ground-based detectors
Eccentricity enables the earliest warning and localization of gravitational waves with ground-based detectors Open
The early and precise localization of gravitational waves (GWs) is pivotal in detecting their electromagnetic (EM) counterparts, especially for binary neutron stars (BNS) and neutron star-black hole binaries (NSBH). In this letter, we pion…
View article: Gravitational Waves from Black-Hole Encounters: Prospects for Ground- and Galaxy-Based Observatories
Gravitational Waves from Black-Hole Encounters: Prospects for Ground- and Galaxy-Based Observatories Open
Close hyperbolic encounters of black holes (BHs) generate certain Burst With Memory (BWM) events in the frequency windows of the operational, planned, and proposed gravitational wave (GW) observatories. We present detailed explorations of …
View article: Parameter estimation of eccentric gravitational waves with a decihertz observatory and its cosmological implications
Parameter estimation of eccentric gravitational waves with a decihertz observatory and its cosmological implications Open
Eccentricity of compact binaries can improve the parameter estimation of gravitational waves (GWs). In this paper, we first investigate the parameter estimation of eccentric GWs with decihertz observatory. We consider two scenarios for the…
View article: Importance of eccentricities in parameter estimation of compact binary inspirals with decihertz gravitational-wave detectors
Importance of eccentricities in parameter estimation of compact binary inspirals with decihertz gravitational-wave detectors Open
During its inspiral stage, a binary black hole (BBH) produces characteristic gravitational wave (GW) signals. The waveform of the GW signals can be described by the physical parameters of BBH, such as the masses of the black holes and the …
View article: Space-borne atom interferometric gravitational wave detections. Part III. Eccentricity on dark sirens
Space-borne atom interferometric gravitational wave detections. Part III. Eccentricity on dark sirens Open
Eccentricity of the inspiraling compact binaries can greatly improve the distance inference and source localization of dark sirens. In this paper, we continue the research for the space-borne atom interferometric gravitational-wave detecto…
View article: Positron accumulation in the GBAR experiment
Positron accumulation in the GBAR experiment Open
View article: Generalized quasi-Keplerian solution for eccentric, nonspinning compact binaries at 4PN order and the associated inspiral-merger-ringdown waveform
Generalized quasi-Keplerian solution for eccentric, nonspinning compact binaries at 4PN order and the associated inspiral-merger-ringdown waveform Open
We derive fourth post-Newtonian (4PN) contributions to the Keplerian type parametric solution associated with the conservative dynamics of eccentric, nonspinning compact binaries. The solution has been computed while ignoring certain zero-…
View article: Eccentricity of Long Inspiraling Compact Binaries Sheds Light on Dark Sirens
Eccentricity of Long Inspiraling Compact Binaries Sheds Light on Dark Sirens Open
The localization and distance inference of gravitational waves are two crucial factors for dark sirens as precise probes of cosmology, astrophysics, and fundamental physics. In this Letter, for the first time we investigate the parameter e…
View article: Space-borne atom interferometric gravitational wave detections. Part II. Dark sirens and finding the one
Space-borne atom interferometric gravitational wave detections. Part II. Dark sirens and finding the one Open
In this paper, we investigate the potential of dark sirens by the space-borne atom interferometric gravitational-wave detectors to probe the Hubble constant. In the mid-frequency band, the sources live a long time. The motion of a detector…
View article: Space-borne Atom Interferometric Gravitational Wave Detections II: Dark Sirens and Finding the One
Space-borne Atom Interferometric Gravitational Wave Detections II: Dark Sirens and Finding the One Open
In this paper, we investigate the potential of dark sirens by the space-borne atom interferometric gravitational-wave detectors to probe the Hubble constant. In the mid-frequency band, the sources live a long time. The motion of a detector…
View article: Generalized quasi-Keplerian solution for eccentric, non-spinning compact binaries at 4PN order and the associated IMR waveform
Generalized quasi-Keplerian solution for eccentric, non-spinning compact binaries at 4PN order and the associated IMR waveform Open
We derive fourth post-Newtonian (4PN) contributions to the Keplerian-type parametric solution associated with the conservative dynamics of eccentric, non-spinning compact binaries. The solution has been computed while ignoring certain zero…
View article: Deep learning model on gravitational waveforms in merging and ringdown phases of binary black hole coalescences
Deep learning model on gravitational waveforms in merging and ringdown phases of binary black hole coalescences Open
The waveform templates of the matched filtering-based gravitational-wave search ought to cover wide range of parameters for the prosperous detection. Numerical relativity (NR) has been widely accepted as the most accurate method for modeli…
View article: Gravitational-wave Capture in Spinning Black Hole Encounters
Gravitational-wave Capture in Spinning Black Hole Encounters Open
The orbits of two black holes (BHs) that are initially unbound can be transformed into bound orbits by emitting gravitational waves during close encounters in a star cluster, which is called gravitational-wave (GW) capture. The effects of …
View article: NEPSC2, the North Ecliptic Pole SCUBA-2 survey: 850-μm map and catalogue of 850-μm-selected sources over 2 deg2
NEPSC2, the North Ecliptic Pole SCUBA-2 survey: 850-μm map and catalogue of 850-μm-selected sources over 2 deg2 Open
We present an 850-μm mosaic map and extracted catalogue of submillimetre sources in the extended North Ecliptic Pole (NEP) region over about 2 deg2. The 850-μm map is constructed using newly obtained observations by SCUBA-2 at the East Asi…