A5100386391- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Astrophysics and Star Formation Studies
- Astro and Planetary Science
- Solar and Space Plasma Dynamics
- Gamma-ray bursts and supernovae
- Galaxies: Formation, Evolution, Phenomena
- Scientific Research and Discoveries
- Astronomical Observations and Instrumentation
- Asymmetric Synthesis and Catalysis
- Membrane Separation Technologies
- Membrane-based Ion Separation Techniques
- Fuel Cells and Related Materials
- Ionosphere and magnetosphere dynamics
- Paleontology and Stratigraphy of Fossils
- Thin-Film Transistor Technologies
- Energy Load and Power Forecasting
- Phase-change materials and chalcogenides
- Solar Radiation and Photovoltaics
- Photochromic and Fluorescence Chemistry
- Astrophysical Phenomena and Observations
- Machine Fault Diagnosis Techniques
- Geophysics and Gravity Measurements
- Adaptive optics and wavefront sensing
- Wind Turbine Control Systems
China Academy of Engineering Physics
2020-2024
China West Normal University
2019-2024
Enrico Fermi Center for Study and Research
2022-2024
Beijing Institute of Radio Metrology and Measurement
2024
Sapienza University of Rome
2023-2024
University of Padua
2024
Osservatorio Astronomico di Padova
2024
Chinese Academy of Sciences
2014-2023
Institute of Electrical Engineering
2016-2023
Nanjing University of Finance and Economics
2023
Our position inside the Galactic disc had prevented us from establishing an accurate rotation curve, until advent of Gaia, whose third data release (Gaia DR3) made it possible to specify up twice optical radius. We aim establish a new curve Galaxy Gaia DR3, by drastically reducing uncertainties and systematics, with goal provide estimate mass Galaxy. have compared different estimates, established robust assessment systematic uncertainties, addressed differences in methodologies, particularly...
We apply a statistical deconvolution of the parallax errors based on Lucy's inversion method (LIM) to Gaia-DR3 sources measure their three dimensional velocity components in range Galactocentric distances $R$ between 8 kpc and 30 with corresponding root mean square values. find results that are consistent those obtained by applying LIM Gaia-DR2 sources, we conclude gives convergent more accurate improving statistics data-set lowering observational errors. The kinematic maps reconstructed up...
We present {complexity} of the Galactic outer disc {by fitting stellar volume densities red giant branch stars with a two-disc component model}. {The discs are confirmed to} extend to $R\sim19$\,kpc. The radial density profile shows {two breaks at $R\sim11$ and $\sim14$\,kpc, respectively, which} separate into three segments different scale lengths $2.12\pm0.26$, $1.18\pm0.08$, $2.72$\,kpc $R<11$, $11\leq R\leq14$, $R>14$\,kpc, respectively. first {break} is likely due sudden drop in thin...
We present a large, homogeneous catalogue of molecular clouds within 4 kpc from the Sun at low Galactic latitudes ($|b|$ $<$ 10\degr) with unprecedented accurate distance determinations. Based on three-dimensional dust reddening map and estimates colour excesses distances over 32 million stars presented in Chen et al, we have identified 567 dust/molecular hierarchical structure identification method obtained their by model fitting algorithm. The typical uncertainty is less than 5 per cent....
In this work, 1272 superflares on 311 stars are collected from 22,539 solar-type the second-year observation of Transiting Exoplanet Survey Satellite (TESS), which almost covered northern hemisphere sky. Three superflare contain hot Jupiter candidates or ultrashort-period planet candidates. We obtain $γ= -1.76\pm 0.11$ correlation between flare frequency and energy ($dN/dE\propto E^{-γ}$) for all get $β=0.42\pm0.01$ duration ($T_{\text {duration }} \propto E^β$), supports that a similar...
Stellar flares are characterized by sudden enhancement of electromagnetic radiation in stellar atmospheres. So far much our understanding comes from photometric observations, which plasma motions flare regions could not be detected. From the spectroscopic data LAMOST DR7, we have found one that is an impulsive increase followed a gradual decrease H$\alpha$ line intensity on M4-type star, and total energy radiated through H${\alpha}$ estimated to order $10^{33}$ erg. The appears Voigt profile...
The nature of optical excitation and the degree intramolecular charge transfer (ICT) as well dynamics excited ICT states two new tribranched donor-pi-acceptor molecules with acceptor-terminated (DA(3)) acceptor-centered (AD(3)) geometries have been investigated by steady-state femtosecond time-resolved stimulated emission fluorescence depletion (FS TR-SEP FD) measurements in different polar solvents. interpretation experimental results is based on comparative investigation D-pi-A compounds...
The newly launched Fengyun-3D (FY-3D) satellite carried a wide-field auroral imager (WAI) that was developed by Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy Sciences (CIOMP), which will provide large field view (FOV), high spatial resolution, broadband ultraviolet images the aurora ionosphere imaging N2 LBH bands emissions. WAI consists two identical cameras, each with an FOV 68° in along-track direction 10° cross-track direction. cameras are tilted relative to...
We investigate the morphology and kinematics of Galactic spiral structure based on a new sample O- early B-type stars. select 6858 highly confident OB star candidates from combined data VST Photometric H α Survey Data Release 2 (VPHAS+ DR2) Gaia (Gaia DR2). Together with O-B2 stars literature, we build consisting 14 880 stars, all parallax uncertainties smaller than 20 per cent. The sample, hitherto largest one robust distance proper motion estimates, covers plane distances up to 6 kpc Sun....
We present a sample of $\sim$ 140,000 primary red clump (RC) stars spectral signal-to-noise ratios higher than 20 from the LAMOST Galactic spectroscopic surveys, selected based on their positions in metallicity-dependent effective temperature--surface gravity and color--metallicity diagrams, supervised by high-quality $Kepler$ asteroseismology data. The stellar masses ages those are further determined spectra, using Kernel Principal Component Analysis method, trained with thousands RCs...
We present a statistical method to derive the stellar density profiles of Milky Way from spectroscopic survey data, taking into account selection effects. assume function, which can be altered during observations and data reductions, is based on photometric colors magnitude. Then underlying function for line-of-sight recovered well by comparing distribution stars in color-magnitude plane with that dataset. Subsequently, profile along derived spectroscopically measured multiplied function....
We present a three dimensional velocity analysis of Milky Way disk kinematics using LAMOST K giant stars and the GPS1 proper motion catalogue. find that Galactic near anticenter direction (in range Galactocentric distance between $R=8$ $13$ kpc vertical position $Z=-2$ $2$ kpc) exhibit asymmetrical motions in radial, azimuthal, components. Radial are not zero, thus departing from circularity orbits; they increase outwards within $R\lesssim 12$ kpc, show some oscillation northern ($0 < Z 2$...
ABSTRACT We perform analysis of the 3D kinematics Milky Way disc stars in mono-age populations. focus on between Galactocentric distances R = 6 and 14 kpc, selected from combined LAMOST Data Release 4 (DR4) red clump giant Gaia DR2 proper motion catalogue. confirm asymmetrical motions recent works provide time tagging Galactic outer near anticentre direction out to kpc. Radial reach values up 10 km s−1, depending age population, present a north–south asymmetry region corresponding density...
Abstract As one of the three payloads for Advanced Space-based Solar Observatory (ASO-S) mission, Lyman-alpha (Ly α ) Telescope (LST) is composed instruments: a Corona Imager (SCI), Ly Disk (SDI) and full-disk White-light (WST). When working in-orbit, LST will simultaneously perform high-resolution imaging observations all regions from solar disk to inner corona up 2.5 R ⊙ (R stands mean radius) with spatial resolution 4.8″ 1.2″ coronal observations, respectively, temporal 30 – 120 s 1...
The unexpected discovery of hot Jupiters challenged the classical theory planet formation inspired by our solar system. Until now, origin and evolution are still uncertain. Determining their age distribution temporal can provide more clues into mechanism subsequent evolution. Using a sample 383 giant planets around Sun-like stars collected from kinematic catalogs Planets Across Space Time (PAST) project, we find that preferentially hosted relatively younger in Galactic thin disk. We...
Abstract The recent discovery of a spiral feature in the Z − V phase plane solar neighborhood implies that galactic disk has been remarkably affected by dwarf galaxy passing through it some hundreds millions years ago. Using 429,500 Large Sky Area Multi-Object Fibre Spectroscopic Telescope K giants stars, we show exists not only vicinity but also extends to about 15 kpc from Galactic center and then disappears beyond this radius. Moreover, find when features plot ϕ as function position at...
Context: In our Paper I, by using statistical deconvolution methods, extended kinematics maps of Gaia-DR2 data have been produced in a range heliocentric distances that are factor two to three larger than those analyzed previously the Gaia Collaboration with same data. It added Galactocentric between 13 kpc and 20 previous maps. Aims: Here, we investigate dynamical effects different mechanisms can explain radial vertical components these kinematic maps, including decomposition bending...
ABSTRACT We estimate the solar peculiar velocities and Oort constants using a sample of 5627 A-type stars with $d\lt 0.6\, \rm kpc$ $|z|\lt 0.1\, kpc$, selected from LAMOST (Large Sky Area Multi-Object Fiber Spectroscopic Telescope) surveys. The radial tangential these are fitted by non-axisymmetric model. best-fitting result yields $(U_\odot ,V_\odot ,W_\odot)=(11.69\pm 0.68, 10.16\pm 0.51, 7.67\pm 0.10)\, km\, s^{-1}$ $A=16.31\pm 0.89\, s^{-1}\, kpc^{-1}$, $B=-11.99\pm 0.79\, $C=-3.10\pm...
CONTEXT. The maximum size of the Galactic stellar disk is not yet known. Some studies have suggested an abrupt drop-off density at Galactocentric distances $R\gtrsim 15$ kpc, which means that in practice no stars or only very few them should be found beyond this limit. However, Milky Way plane are detected larger distances. In addition to halo component, star counts placed end 20 although has been spectroscopically confirmed so far. AIMS. Here, we aim confirm presence up much METHODS. With...
As a major diarrheagenic human pathogen, enterohemorrhagic Escherichia coli (EHEC) produce attaching and effacing (A/E) lesions, characterized by the formation of actin pedestals, on mammalian cells. A bacterial T3SS effector NleL from EHEC O157:H7 was recently shown to be HECT-like E3 ligase in vitro, but its biological functions host targets remain elusive. Here, we report that is required effectively promote EHEC-induced A/E lesions infection. Furthermore, c-Jun NH2-terminal kinases...
ABSTRACT Stellar magnetic activity is an interesting phenomenon in late-type stars. We use the medium-resolution spectroscopic observations of 406 069 stars from LAMOST to explore their properties. perform a statistical analysis on and associated physical parameters. Our samples are cross-matched with other data bases (LAMOST DR5, VSX, SDSS DR12) obtain additional observational The equivalent widths (EWs) Hα lines, indicator chromospheric activity, calculated. According EWs line, we detect...