Exoplanet orbital eccentricities derived from LAMOST–Kepler analysis
- Ji-Wei Xie, S. Dong, Yong Zhang
- Physics, GeologyProceedings of the National Academy of Sciences
- 26 September 2016
The eccentricity distributions of an unprecedented large and homogeneous sample of 698 Kepler planets are derived and a dichotomy in eccentricities is discovered: the systems with single transiting planets, which make up half of the sample, have a large mean eccentricity, whereas the multiples are on nearly circular orbits.
Post-oligarchic Evolution of Protoplanetary Embryos and the Stability of Planetary Systems
- Ji-lin Zhou, D. Lin, Yi-sui Sun
- Geology, Physics
- 15 May 2007
In the sequential accretion model, planets form through the sedimentation of dust, cohesive collisions of planetesimals, and coagulation of protoplanetary embryos prior to the onset of efficient gas…
Transiting Exoplanet Monitoring Project (TEMP). V. Transit Follow Up for HAT-P-9b, HAT-P-32b, and HAT-P-36b
- Yonghao Wang, Songhu Wang, G. Laughlin
- Physics, GeologyAstronomical Journal
- 29 January 2019
During the past five years, 6, 7, and 26 transit observations were carried out for the HAT-P-9b, HAT-P-32b, and HAT-P-36b systems, respectively, through the Transiting Exoplanet Monitoring Project…
Occurrence and Stability of Apsidal Resonance in Multiple Planetary Systems
- Ji-lin Zhou, Yi-sui Sun
- Physics, Geology
- 7 August 2003
With the help of the Laplace-Lagrange solution of the secular perturbation theory in a double-planet system, we study the occurrence and the stability of apsidal secular resonance between the two…
LAMOST telescope reveals that Neptunian cousins of hot Jupiters are mostly single offspring of stars that are rich in heavy elements
- S. Dong, Ji-Wei Xie, Ji-lin Zhou, Zheng Zheng, A. Luo
- Physics, GeologyProceedings of the National Academy of Sciences
- 23 June 2017
A population of short-period, Neptune-size planets sharing key similarities with hot Jupiters is discovered: both populations are preferentially hosted by metal-rich stars, and both are preferentialially found in Kepler systems with single-transiting planets.
FOREVER ALONE? TESTING SINGLE ECCENTRIC PLANETARY SYSTEMS FOR MULTIPLE COMPANIONS
- R. Wittenmyer, Songhu Wang, Ji-lin Zhou
- Geology, Physics
- 3 July 2013
Determining the orbital eccentricity of an extrasolar planet is critically important for understanding the system's dynamical environment and history. However, eccentricity is often poorly determined…
PLANETESIMAL ACCRETION IN BINARY SYSTEMS: COULD PLANETS FORM AROUND α CENTAURI B?
- Ji-Wei Xie, Ji-lin Zhou, J. Ge
- Physics, Geology
- 10 January 2010
Stellar perturbations affect planet formation in binary systems. Recent studies show that the planet-formation stage of mutual accretion of km-sized planetesimals is most sensitive to binary effects.…
Transiting Exoplanet Monitoring Project (TEMP). IV. Refined System Parameters, Transit Timing Variations, and Orbital Stability of the Transiting Planetary System HAT-P-25
- Xian-Yu Wang, Songhu Wang, Yuanyuan Chen
- Physics, Geology
- 25 April 2018
We present eight new light curves of the transiting extra-solar planet HAT-P-25b obtained from 2013 to 2016 with three telescopes at two observatories. We use the new light curves, along with recent…
PLANETESIMAL ACCRETION IN BINARY SYSTEMS: ROLE OF THE COMPANION'S ORBITAL INCLINATION
- Ji-Wei Xie, Ji-lin Zhou
- Geology, Physics
- 6 April 2009
Recent observations show that planets can reside in close binary systems with stellar separation of only ∼20 AU. However, planet formation in such close binary systems is a challenge to current…
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