W.-H. Ip
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View article: Characterizing Temperatures of Flares on the M Dwarf Wolf 359 from Simultaneous Multiband Optical Observations
Characterizing Temperatures of Flares on the M Dwarf Wolf 359 from Simultaneous Multiband Optical Observations Open
We present a flare temperature study of the highly active M dwarf Wolf 359 using simultaneous multiband ( u , g , r , i , and z ) photometric observations from the Lulin 1 m and 41 cm telescopes. Twelve flares were detected over five night…
View article: Water Transport from Enceladus to the Rings
Water Transport from Enceladus to the Rings Open
Enceladus continuously ejects approximately 300 kg s −1 of water vapor from its south polar regions, forming an extensive neutral gas torus around Saturn. In this study, we use the direct simulation Monte Carlo method to model the detailed…
View article: Magnetohydrodynamic simulation assessment of a potential near-ultraviolet early ingress in WASP-189b
Magnetohydrodynamic simulation assessment of a potential near-ultraviolet early ingress in WASP-189b Open
Context . Ultra-hot Jupiters (UHJs) in close orbits around early-type stars provide natural laboratories for studying atmospheric escape and star-planet interactions under extreme irradiation and wind conditions. The near-ultraviolet (NUV)…
View article: Characterizing Temperatures of Flares on the M Dwarf Wolf 359 from Simultaneous Multiband Optical Observations
Characterizing Temperatures of Flares on the M Dwarf Wolf 359 from Simultaneous Multiband Optical Observations Open
We present a flare temperature study of the highly active M~dwarf Wolf~359 using simultaneous multiband ($u$, $g$, $r$, $i$, and $z$) photometric observations from the Lulin 1-m and 41-cm telescopes. Twelve flares were detected over five n…
View article: CROWN/Apophis Mission
CROWN/Apophis Mission Open
The close encounter of asteroid (99942) Apophis with Earth on 2029 April 13 represents a once-in-thousands-of-years opportunity to study the effects of tidal interaction from a planet on the evolution of an asteroid. We propose to use the …
View article: Surface Deposition of Icy Dust Entrained in Europa’s Plumes
Surface Deposition of Icy Dust Entrained in Europa’s Plumes Open
Europa, an icy moon of Jupiter, features complex surface characteristics shaped by tidal forces and interactions with its subsurface ocean, making it a key target for astrobiology research. Outgassing plumes have been reported using Earth-…
View article: Solar Wind–Magnetosphere Coupling by the Kelvin–Helmholtz Instability at Mercury
Solar Wind–Magnetosphere Coupling by the Kelvin–Helmholtz Instability at Mercury Open
The Kelvin–Helmholtz instability (KHI) has been considered important in the energy transfer and momentum coupling between the solar wind and planetary magnetospheres. To explore this issue, we employ a two-dimensional magnetohydrodynamic s…
View article: Scalable, Advanced Machine Learning Based Approaches for Stellar Flare Identification: Application to TESS Short-cadence Data and Analysis of a New Flare Catalog
Scalable, Advanced Machine Learning Based Approaches for Stellar Flare Identification: Application to TESS Short-cadence Data and Analysis of a New Flare Catalog Open
We apply multialgorithm machine learning models to TESS 2 minute survey data from Sectors 1–72 to identify stellar flares. Models trained with deep neural network, random forest, and XGBoost algorithms utilize four flare light-curve charac…
View article: On Energization and Loss of the Ionized Heavy Atom and Molecule in Mars' Atmosphere
On Energization and Loss of the Ionized Heavy Atom and Molecule in Mars' Atmosphere Open
The absence of global magnetic fields is often cited to explain why Mars lacks a dense atmosphere. This line of thought is based on a prevailing theory that magnetic fields can shield the atmosphere from solar wind erosion. However, we pre…
View article: Scalable, Advanced Machine Learning-based Approaches for Stellar Flare Identification: Application to TESS short-cadence Data and Analysis of a New Flare Catalogue
Scalable, Advanced Machine Learning-based Approaches for Stellar Flare Identification: Application to TESS short-cadence Data and Analysis of a New Flare Catalogue Open
We apply multi-algorithm machine learning models to TESS 2-minute survey data from Sectors 1-72 to identify stellar flares. Models trained with Deep Neural Network, Random Forest, and XGBoost algorithms, respectively, utilized four flare l…
View article: Temporal Variations of <sup>222</sup>Rn Density Distributions in the Lunar Exosphere
Temporal Variations of <sup>222</sup>Rn Density Distributions in the Lunar Exosphere Open
Because of radiogenic processes, the lunar interior is a source of rare gases like helium ( 4 He), argon ( 40 Ar), and radon ( 222 Rn) that might be released continuously, or impulsively during moonquakes. The detection of radon is therefo…
View article: Postperihelion Cometary Activity on the Outer Main-belt Asteroid 2005 XR<sub>132</sub>
Postperihelion Cometary Activity on the Outer Main-belt Asteroid 2005 XR<sub>132</sub> Open
We report comet-like activity on the outer main-belt asteroid 2005 XR 132 discovered by the Lulin One-meter Telescope in early 2021 April. A series of follow-up observations were triggered to characterize the morphology and brightness vari…
View article: Magnetohydrodynamic Perspective on the Disappearance of Mercury’s Bow Shock by Helios Data Exploration
Magnetohydrodynamic Perspective on the Disappearance of Mercury’s Bow Shock by Helios Data Exploration Open
In the magnetohydrodynamic (MHD) perspective, the planet’s bow shock would disappear when the fast-mode Mach number ( M F ) of the solar wind is less than one. Compared to Earth, Mercury is subject to a lower M F solar wind due to its prox…
View article: Infalling of Nano-dust Because of Air Drag on Uranus
Infalling of Nano-dust Because of Air Drag on Uranus Open
Uranus and Saturn share similarities in terms of their atmospheric composition, which is primarily made up of hydrogen and helium, as well as their ring systems. Uranus has 13 known rings, which are divided into narrow main rings, dusty ri…
View article: Mass Accretion, Spectral, and Photometric Properties of T Tauri Stars in Taurus Based on TESS and LAMOST
Mass Accretion, Spectral, and Photometric Properties of T Tauri Stars in Taurus Based on TESS and LAMOST Open
We present the analysis of 16 classical T Tauri stars (CTTSs) using LAMOST and TESS data, investigating spectral properties, photometric variations, and mass accretion rates. All 16 stars exhibit emissions in H α lines, from which the aver…
View article: Physical properties of the Didymos system before and after the DART impact
Physical properties of the Didymos system before and after the DART impact Open
Context. On September 26, 2022, the Double Asteroid Redirection Test (DART) successfully changed the trajectory of the asteroid Dimorphos (i.e. 65803 Didymos I), a satellite circling (65803) Didymos. Aims. We aim to characterize the conseq…
View article: EDEN Survey: Small Transiting Planet Detection Limits and Constraints on the Occurrence Rates of Planets around Late-M Dwarfs within 15 pc
EDEN Survey: Small Transiting Planet Detection Limits and Constraints on the Occurrence Rates of Planets around Late-M Dwarfs within 15 pc Open
Earth-sized exoplanets that transit nearby, late-spectral-type red dwarfs will be prime targets for atmospheric characterization in the coming decade. Such systems, however, are difficult to find via widefield transit surveys like Kepler o…
View article: EDEN Survey: Small Transiting Planet Detection Limits and Constraints on the Occurrence Rates for Late M Dwarfs within 15 pc
EDEN Survey: Small Transiting Planet Detection Limits and Constraints on the Occurrence Rates for Late M Dwarfs within 15 pc Open
Earth-sized exoplanets that transit nearby, late spectral type red dwarfs will be prime targets for atmospheric characterization in the coming decade. Such systems, however, are difficult to find via wide-field transit surveys like Kepler …
View article: The Large Superfast Rotators Discovered by the Zwicky Transient Facility
The Large Superfast Rotators Discovered by the Zwicky Transient Facility Open
Two high-cadence surveys aiming for rotation period measurements of asteroids have been conducted in 2019 January and October using the Zwicky Transient Facility. From the surveys, 25 large superfast rotators (SFRs) were discovered and the…
View article: A SUBLIME 3D Model for Cometary Coma Emission: The Hypervolatile-rich Comet C/2016 R2 (PanSTARRS)
A SUBLIME 3D Model for Cometary Coma Emission: The Hypervolatile-rich Comet C/2016 R2 (PanSTARRS) Open
The coma of comet C/2016 R2 (PanSTARRS) is one of the most chemically peculiar ever observed, in particular due to its extremely high CO/H 2 O and /H 2 O ratios, and unusual trace volatile abundances. However, the complex shape of …
View article: Time-series and Phase-curve Photometry of the Episodically Active Asteroid (6478) Gault in a Quiescent State Using APO, GROWTH, P200, and ZTF
Time-series and Phase-curve Photometry of the Episodically Active Asteroid (6478) Gault in a Quiescent State Using APO, GROWTH, P200, and ZTF Open
We observed the episodically active asteroid (6478) Gault in 2020 with multiple telescopes in Asia and North America and found that it is no longer active after its recent outbursts at the end of 2018 and the start of 2019. The inactivity …
View article: Thermophysical Model for Realistic Surface Layers on Airless Small Bodies: Applied to Study the Spin Orientation and Surface Dust Properties of (24) Themis from WISE/NEOWISE Multiepoch Thermal Light Curves
Thermophysical Model for Realistic Surface Layers on Airless Small Bodies: Applied to Study the Spin Orientation and Surface Dust Properties of (24) Themis from WISE/NEOWISE Multiepoch Thermal Light Curves Open
This work proposes a thermophysical model for realistic surface layers on airless small bodies (RSTPM) for the use of interpreting their multiepoch thermal light curves (e.g., WISE/NEOWISE). RSTPM considers the real orbital cycle, rotation…
View article: Gas terminal velocity from MIRO/Rosetta data using neural network approach
Gas terminal velocity from MIRO/Rosetta data using neural network approach Open
Context. The Microwave Instrument on the Rosetta Orbiter (MIRO) on board the Rosetta spacecraft was designed to investigate the surface and gas activity of the comet 67P/Churyumov-Gerasimenko. The MIRO spectroscopic measurements carry info…
View article: Initial characterization of active transitioning centaur, P/2019 LD2 (ATLAS), using Hubble, Spitzer, ZTF, Keck, Apache Point Observatory, and GROWTH visible and infrared imaging and spectroscopy
Initial characterization of active transitioning centaur, P/2019 LD2 (ATLAS), using Hubble, Spitzer, ZTF, Keck, Apache Point Observatory, and GROWTH visible and infrared imaging and spectroscopy Open
We present visible and mid-infrared imagery and photometry of temporary Jovian co-orbital comet P/2019 LD2 taken with Hubble Space Telescope/Wide Field Camera 3 (HST/WFC3), Spitzer Space Telescope/Infrared Array Camera (Spitzer/IRAC), and …
View article: James Clerk Maxwell Telescope Spectral and Continuum Imaging of Hyperactive Comet 46P/Wirtanen
James Clerk Maxwell Telescope Spectral and Continuum Imaging of Hyperactive Comet 46P/Wirtanen Open
The Jupiter-family comet (JFC) 46P/Wirtanen passed the Earth at a distance of 0.077 au on 2018 December 16 UT, presenting a rare opportunity to study the chemical structure of its coma. With the James Clerk Maxwell Telescope we achieved a …
View article: Characterization of Temporarily Captured Minimoon 2020 CD<sub>3</sub> by Keck Time-resolved Spectrophotometry
Characterization of Temporarily Captured Minimoon 2020 CD<sub>3</sub> by Keck Time-resolved Spectrophotometry Open
We present time-resolved visible spectrophotometry of 2020 CD 3 , the second known minimoon. The spectrophotometry was taken with the Keck I/Low Resolution Imaging Spectrometer between wavelengths 434 and 912 nm in the B , g , V , R , I , …
View article: The Asteroid Rotation Period Survey Using the China Near-Earth Object Survey Telescope (CNEOST)
The Asteroid Rotation Period Survey Using the China Near-Earth Object Survey Telescope (CNEOST) Open
We initiated the bilateral collaboration between the Lulin Observatory and the Purple Mountain Observatory to collect asteroid lightcurves using the Chinese Near-Earth Object Survey Telescope at the Xuyi Observation Station. The primary go…
View article: Observations of the Hydrogen Cyanide in Comet 46P/Wirtanen at a 3.4 mm Wavelength
Observations of the Hydrogen Cyanide in Comet 46P/Wirtanen at a 3.4 mm Wavelength Open
We searched for rotational lines of H 12 C 14 N in comet 46P/Wirtanen, using the Purple Mountain Observatory 13.7 m radio telescope. The J = 1–0 lines of HCN (3.4 mm wavelength) were unambiguously detected in 46P during the 2018 December 1…