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Updated: Mar 14, 2026
06:48
Surface Mapping of Earth-like Exoplanets using Single Point Light Curves
Published on: May 10, 2020
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Exoplanet orbital eccentricities derived from LAMOST-Kepler analysis
Ji-Wei Xie1, Subo Dong2, Zhaohuan Zhu3
1School of Astronomy and Space Science, Nanjing University, Nanjing 210093, China; Key Laboratory of Modern Astronomy and Astrophysics in Ministry of Education, Nanjing University, Nanjing 210093, China; jwxie@nju.edu.cn dongsubo@pku.edu.cn.
Summary
The solar system
Area of Science:
- Astronomy and astrophysics
- Exoplanetary science
Background:
- The solar system's circular, coplanar orbits suggest disk formation.
- Early discovered exoplanets often have eccentric orbits, questioning solar system uniqueness.
Purpose of the Study:
- To investigate the orbital eccentricity distribution of Kepler exoplanets.
- To compare Kepler exoplanet systems with our solar system.
Main Methods:
- Utilized precise host star parameters from LAMOST observations.
- Analyzed transit duration statistics for a large, homogeneous Kepler planet sample (698 planets).
Main Results:
- Found an eccentricity dichotomy: single-transiting planets are eccentric (e ≈ 0.3), while multiple-transiting planets are nearly circular (e ≈ 0.03) and coplanar.
- Kepler multiples and solar system objects share a common relation between eccentricity and mutual inclination.
Conclusions:
- The solar system's architecture is not unique; many Kepler multiple-planet systems exhibit similar low eccentricities and coplanarity.
- Disk formation may be a common process for generating ordered planetary systems throughout the galaxy.
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