Kyung Hee University · Physics and Astronomy
Professor Jeong-Eun Lee's research lab specializes in astrochemistry and star formation, focusing on the chemical and physical evolution of star-forming cores from pre- to protostellar stages. The lab combines multi-phase modeling of gas dynamics, dust radiative transfer, molecular chemistry, and radiative transfer to interpret submillimeter and infrared observations. Key research directions include molecular line variability, chemical depletion in dense cores, and the role of protostellar feedback in shaping molecular chemistry. The lab also explores advanced materials for oxide semiconductor devices, particularly graphene-embedded oxide TFTs for stable high-temperature operation.
Figures are computed from collected data and may differ slightly.
Understanding the chemical evolution in star-forming cores is a necessary pre-condition to correctly assess physical conditions when using molecular emission. We follow the evolution of chemistry and molecular line profiles through the entire star formation process, including a self-consistent treatment of dynamics, dust continuum radiative transfer, gas energetics, chemistry, molecular excitation, and line radiative transfer. In particular, the chemical code follows a gas parcel as it falls tow
We have compared molecular line emission to dust continuum emission and modeled molecular lines using Monte Carlo simulations in order to study the depletion of molecules and the ionization fraction in three preprotostellar cores, L1512, L1544, and L1689B. L1512 is much less dense than L1544 and L1689B, which have similar density structures. L1689B has a different environment from those of L1512 and L1544. We used density and temperature profiles, calculated by modeling dust continuum emission i
We present the four-year survey results of monthly submillimeter monitoring of eight nearby ($< 500 $pc) star-forming regions by the JCMT Transient Survey. We apply the Lomb-Scargle Periodogram technique to search for and characterize variability on 295 submillimeter peaks brighter than 0.14 Jy beam$^{-1}$, including 22 disk sources (Class II), 83 protostars (Class 0/I), and 190 starless sources. We uncover 18 secular variables, all of them protostars. No single-epoch burst or drop events and no
Abstract We present a library of high-resolution ( R ≡ λ /Δ λ ∼ 45,000) and high signal-to-noise ratio (S/N ≥ 200) near-infrared spectra for stars of a wide range of spectral types and luminosity classes. The spectra were obtained with the Immersion GRating INfrared Spectrograph covering the full range of the H (1.496–1.780 μ m) and K (2.080–2.460 μ m) atmospheric windows. The targets were primarily selected for being MK standard stars covering a wide range of effective temperatures and surface
The excellent impermeability of graphene was exploited to produce stable ohmic contact at the interface between Al metal and a semiconducting indium gallium zinc oxide (IGZO) layer after high-temperature annealing. Thin film transistors (TFTs) were fabricated with and without a graphene interlayer between the Al metal and the IGZO channel region. Metal contact at the interface prepared without a graphene interlayer showed serious instabilities in the IGZO TFT under thermal annealing; however, th
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