553 citations · 802 across the 17 of their papers we have counts for
17 papers
Systematics of planetary ephemeris reference frames inferred from pulsar timing astrometry
Niu Liu, Ziu Zhu, John Antoniadis +2
This study aims to investigate the systematics in planetary ephemeris reference frames through pulsar timing observations. We used the published data sets from several pulsar timin…
Comparison of dynamical and kinematic reference frames via pulsar positions from timing, Gaia, and interferometric astrometry
Niu Liu, Zi Zhu, John Antoniadis +3
Pulsars are special objects whose positions can be determined independently from timing, radio interferometric, and Gaia astrometry at sub-milliarcsecond (mas) precision; thus, the…
CHES: a space-borne astrometric mission for the detection of habitable planets of the nearby solar-type stars
Jianghui Ji, Haitao Li, Junbo Zhang +19
The Closeby Habitable Exoplanet Survey (CHES) mission is proposed to discover habitable-zone Earth-like planets of the nearby solar-type stars ( away from our…
Evaluate the ICRF3 axes stability via extragalactic source position time series
Niu Liu, Sebastien Lambert, Felicitas Arias +2
We present an updated study on assessing the axes stability of the third generation of the International Celestial Reference Frame (ICRF3) in terms of linear drift and scatter base…
Planets Across Space and Time (PAST). III. Morphology of the Planetary Radius Valley as a Function of Stellar Age and Metallicity in the Galactic Context Revealed by the LAMOST-Gaia-Kepler Sample
Di-Chang Chen, Ji Wei Xie, Ji-Lin. Zhou +7
The radius valley, a dip in the radius distribution of exoplanets at ~1.9 Earth radii separates compact rocky Super-Earths and Sub-Neptunes with lower density. Various hypotheses h…
Evaluation of the ICRF stability from position time series analysis
Niu Liu, Sebastien Lambert, Felicitas Arias +2
The celestial reference frame is realized by absolute positions of extragalactic sources that are assumed to be fixed in the space. The fixing of the axes is one of the crucial poi…
Vertical structure of Galactic disk kinematics from LAMOST K giants
Ping-Jie Ding, Xiang-Xiang Xue, Chengqun Yang +3
We examine the vertical structure of Galactic disk kinematics over a Galactocentric radial distance range of and up to away from the Galactic pla…
Comparison of multifrequency positions of extragalactic sources from global geodetic VLBI monitoring program and Gaia EDR3
Niu Liu, Sebastien Lambert, Patrick Charlot +5
We extend previous works by considering two additional radio frequencies (K band and X/Ka band) with the aim to study the frequency dependence of the source positions and its poten…
Systematics and accuracy of VLBI astrometry: What can be learned from a comparison with Gaia Data Release 2
Niu Liu, Sebastien Lambert, Zi Zhu +1
We aim to investigate the overall properties of the ICRF3 with the help of the Gaia Data release 2 (Gaia DR2). This could serve as an external check of the quality of the ICRF3. Th…
Analyses of celestial pole offsets with VLBI, LLR, and optical observations
Yu-Ting Cheng, Jia-Cheng Liu, Zi Zhu
This work aims to explore the possibilities of determining the long-period part of the precession-nutation of the Earth with techniques other than very long baseline interferometry…
Kinematics of Solar neighborhood stars and its dependency on age and metallicity
Zong-Bo Huyan, Zi Zhu, Jia-Cheng Liu
We have constructed a catalog containing best available astrometric, photometric, radial velocity and astrophysical data for mainly F-type and G-type stars (called the Astrometric…
Aberration in proper motions for stars in our Galaxy
Jia-Cheng Liu, Yi Xie, Zi Zhu
Accelerations of both the solar system barycenter (SSB) and stars in the Milky Way cause a systematic observational effect on the stellar proper motions, which was first studied in…
LAMOST Experiment for Galactic Understanding and Exploration (LEGUE) The survey science plan
Licai Deng, Heidi Jo Newberg, Chao Liu +22
We describe the current plans for a spectroscopic survey of millions of stars in the Milky Way galaxy using the Guo Shou Jing Telescope (GSJT, formerly the Large Area Multi-Object…
The selection of LEGUE disk targets for LAMOST's pilot survey
Li Chen, Jinliang Hou, Jincheng Yu +18
We describe the target selection algorithm for the low latitude disk portion of the LAMOST Pilot Survey, which aims to test systems in preparation for the LAMOST spectroscopic surv…
An Algorithm for Preferential Selection of Spectroscopic Targets in LEGUE
Jeffrey L. Carlin, Sebastien Lepine, Heidi Jo Newberg +22
We describe a general target selection algorithm that is applicable to any survey in which the number of available candidates is much larger than the number of objects to be observ…
Constructing a Galactic coordinate system based on near-infrared and radio catalogs
Jia-Cheng Liu, Zi Zhu, Bo Hu
The definition of the Galactic coordinate system was announced by the IAU Sub-Commission 33b on behalf of the IAU in 1958. For more than 50 years the definition of the Galactic coo…
Reconsidering the galactic coordinate system
Jia-Cheng Liu, Zi Zhu, Hong Zhang
Initially defined by the IAU in 1958, the galactic coordinate system was thereafter in 1984 transformed from the B1950.0 FK4-based system to the J2000.0 FK5-based system. In 1994,…