P. S. Chiang
A5060677890- Stellar, planetary, and galactic studies
- Astro and Planetary Science
- Gamma-ray bursts and supernovae
- Astrophysics and Star Formation Studies
- Astronomical Observations and Instrumentation
- Astronomy and Astrophysical Research
- Planetary Science and Exploration
- Astrophysical Phenomena and Observations
- SAS software applications and methods
- Astrophysics and Cosmic Phenomena
- Atmospheric Ozone and Climate
- Galaxies: Formation, Evolution, Phenomena
- Space Exploration and Technology
- Isotope Analysis in Ecology
- Geophysics and Gravity Measurements
- GNSS positioning and interference
- Meteorological Phenomena and Simulations
- Particle Accelerators and Free-Electron Lasers
National Central University
2006-2020
Korea Astronomy and Space Science Institute
2011
The radio quasar 3C 454.3 underwent an exceptional optical outburst lasting more than 1 year and culminating in spring 2005. maximum brightness detected was R = 12.0, which represents the most luminous state thus far observed (M_B ~ -31.4). In order to follow emission behaviour of source detail, a large multiwavelength campaign organized by Whole Earth Blazar Telescope (WEBT). Continuous optical, near-IR monitoring performed several bands. ToO pointings Chandra INTEGRAL satellites provided...
Earth- and space-based observations provide synergistic information for space mission encounters by providing data over longer timescales, at different wavelengths using techniques that are impossible with an in situ flyby. We report here such support of the EPOXI spacecraft flyby comet 103P/Hartley 2. The nucleus is small dark, exhibited a very rapidly changing rotation period. Prior to onset activity, period was ∼16.4 hr. Starting 2010 August changed from 16.6 hr near 19 December. With...
Abstract The variability of young stellar objects is mostly driven by star–disk interactions. In long-term photometric monitoring the accreting T Tauri star GI Tau, we detect extinction events with typical depths <?CDATA ${\rm{\Delta }}V\sim 2.5$?> mag that last for days to months and often appear occur stochastically. 2014–2015, extinctions repeated a quasi-period 21 over several are first empirical evidence slow warps predicted magnetohydrodynamic simulations form at few radii away from...
Abstract Given its relative proximity (∼430 pc), compact size (<20′), young age (∼0.5 Myr), and rich number of stellar objects, the Serpens-South star-forming region is a promising site for studying substellar yet low-mass members this remain largely undiscovered. In article we report on deep photometric survey using custom 1.45 μ m filter ( W band), as well standard J H near-IR filters, in order to identify candidate brown dwarfs region. We constructed reddening-insensitive index Q ) by...
Abstract We have identified stellar and substellar members in the nearby star cluster Coma Berenices, using photometry, proper motions, distances of a combination 2MASS, UKIDSS, URAT1, Gaia /DR2 data. Those with parallax measurements provide most reliable sample to constrain distance, averaging 86.7 pc dispersion 7.1 pc, age ∼800 Myr, cluster. This is older than 400–600 Myr commonly adopted literature. Our analysis, complete within 5° radius, leads identification 192 candidates, among which,...
Abstract We report serendipitous optical imaging of CVSO30c, an exoplanet candidate associated with the pre-main-sequence T Tauri star CVSO30 that resides in 25 Ori stellar cluster. perform PSF modeling on our seeing-limited image to remove lights from host (CVSO30), allowing us extract photometry CVSO30c be g = 23.2 ± 0.2 (statistic) 0.1 (systematic) and r 21.5 magnitudes, respectively. This is 170 80 times too bright bands, respectively, if were L0 substellar object as suggested by...
We report the discovery of two methane dwarfs in dark cloud L 1688 Rho Oph star-forming region. The objects were among T dwarf candidates with possible absorption and cool atmospheres, as diagnosed by infrared colors using deep WIRCam/CFHT HK plus CH4ON images, IRAC/Spitzer c2d data. Follow-up spectroscopic observations FLAMINGOS-2/Gemini South confirmed at 1.6 micron. Compared spectral templates known field, i.e., old populations, J162738-245240 (Oph-T3) is a T0/T1 type, whereas...
GM Cephei (GM Cep) is an active T Tauri star in the young (∼ 4 Myr) open cluster Trumpler 37, showing abrupt UX Orionis type of photometric variability. Chen et al. (2012) reported frequent, sporadic brightening events, each < 0.5 mag and lasting for days, which must have been originated from circumstellar accretion. In addition, also showed a brightness drop ∼ 1 continuously about month, during time became bluer when fainter. Moreover, drops seem to recurrence timescale year. It proposed...
Abstract We have developed a robust and efficient algorithm to identify gravitational lensing arcs interacting galaxies. The has been applied the Red Sequence Survey II (RCS II) data, we demonstrate few examples here.