16 citations · 27 across the 12 of their papers we have counts for
12 papers
Still non-accelerating: age-bias correction in supernova cosmology is robust to host-progenitor age mapping
Chul Chung, Junhyuk Son, Seunghyun Park +4
We re-examine the claim by Wiseman et al. (2026) that progenitor-age bias has a negligible impact on cosmological inferences from Type Ia supernovae (SNe Ia). We show that their in…
Chemical signatures of planetary systems in their host stars. Near-infrared spectroscopy of four planet-hosting wide binaries
Dongwook Lim, Sol Yun, Andreas J. Koch-Hansen +3
An important open question in exoplanet studies is whether planets leave detectable chemical fingerprints on their host stars. While several studies have suggested possible planeta…
How Robust is the Cosmic Distance with Tip of Red Giant Branch against Stellar Population Variations?
Chul Chung, Young-Wook Lee, Suk-Jin Yoon +10
The tip of the red giant branch (TRGB) provides a key standard candle for extragalactic distance measurements and for refining the Hubble constant. We test its robustness by quanti…
Strong Progenitor Age-bias in Supernova Cosmology. II. Alignment with DESI BAO and Signs of a Non-Accelerating Universe
Junhyuk Son, Young-Wook Lee, Chul Chung +2
Supernova (SN) cosmology is based on the key assumption that the luminosity standardization process of Type Ia SNe remains invariant with progenitor age. However, direct and extens…
Near-Infrared Spectroscopy with IGRINS-2 for Studying Multiple Stellar Populations in Globular Clusters
Dongwook Lim, Young-Wook Lee, Sol Yun +53
Recent advancements in near-infrared (NIR) spectroscopy have opened new opportunities for studying multiple stellar populations in globular clusters (GCs), particularly for newly d…
Strong progenitor age bias in supernova cosmology. I. Robust and ubiquitous evidence from a larger sample of host galaxies in a broader redshift range
Chul Chung, Seunghyun Park, Junhyuk Son +2
Type Ia supernovae (SNe Ia) serve as the most crucial standardizable candles in cosmology, providing direct measurements of the universe's expansion history. However, it is well-kn…
Comparison of chemical compositions between the bright and faint red clumps for the metal-poor and metal-rich populations in the Milky Way bulge
Seungsoo Hong, Dongwook Lim, Young-Wook Lee
We examined the double red clump (RC) observed in the Galactic bulge, interpreted as a difference in distance ("X-shaped bulge scenario") or in chemical composition ("multiple popu…
Two stellar populations with different metallicities in the low-mass globular cluster Gran 5
Dongwook Lim, Sang-Hyun Chun, Young-Wook Lee +3
Context. With the increasing number of discoveries of globular clusters in the inner Milky Way, the need for spectroscopic confirmation and further investigation of their stellar p…
Chemical homogeneity of wide binary system: An approach from Near-Infrared spectroscopy
Dongwook Lim, Andreas J. Koch-Hansen, Seungsoo Hong +2
Wide binaries, with separations between two stars from a few AU to more than several thousand AU, are valuable objects for various research topics in Galactic astronomy. As the num…
On the root cause of the host `mass-step' in the Hubble residuals of type Ia supernovae
Chul Chung, Suk-Jin Yoon, Seunghyun Park +4
It is well established that the Hubble residuals of type Ia supernovae (SNe Ia) show the luminosity step with respect to their host galaxy stellar masses. This `mass-step' is taken…
High-resolution near-infrared spectroscopy of globular cluster and field stars toward the Galactic bulge
Dongwook Lim, Andreas J. Koch-Hansen, Sang-Hyun Chun +2
Globular clusters (GCs) play an important role in the formation and evolution of the Milky Way. New candidates are continuously found, particularly in the high-extinction low-latit…
Nonlinear Color-Metallicity Relations of Globular Clusters. V. Nonlinear Absorption-line Index versus Metallicity Relations and Bimodal Index Distributions of M31 Globular Clusters
Sooyoung Kim, Suk-Jin Yoon, Chul Chung +5
Recent spectroscopy on the globular cluster (GC) system of M31 with unprecedented precision witnessed a clear bimodality in absorption-line index distributions of old GCs. Such div…