2001 Fiscal Year Final Research Report Summary
Dynamical Stability and Dynamical Evolution of Extra-Solar Planetary System
Project/Area Number |
12640241
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Research Category |
Grant-in-Aid for Scientific Research (C)
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Allocation Type | Single-year Grants |
Section | 一般 |
Research Field |
Astronomy
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Research Institution | National Astronomical Observatory |
Principal Investigator |
KINOSHITA Hiroshi National Astronomical Observatory Fundametal Astronmy Professor and Celestila Mechanics, 位置天文・天体力学研究系, 教授 (00012857)
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Co-Investigator(Kenkyū-buntansha) |
NAKAI Hiroshi National Astronomical Observatory Public Relation Center Associate Professor, 天文情報公開センター, 助教授 (60155653)
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Project Period (FY) |
2000 – 2001
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Keywords | Extrasolar Planets / Mean Motion Resonance / Secular Resonance / Corotation of Pericenters |
Research Abstract |
Since the discovery of a planet Of 51 Peg, 76 planets orbiting nearby stars have been discovered from the Doppler observations. Among them v Andromedae has three planets and, GJ876, HD83443, HD1683443, HD82943, HD74156, and 47 Uma have two planets. In the planetary systems of HD83443, HD1683443, HD74156, and 47 Uma the mutual distance between two planets are very large compared with their mutual Hill radius and then they are dynamically stable. In other three planetary stems the mutual distances are small and their eccentricity large, which means that a close approach may take place and become unstable. We mainly investigated the long-term dynamical stability of these planetary systems and obtained the following results : 1)These planetary systems are stabilized by the corotation of the pericenters and/or 2 : 1 mean motion resonance. 2)The stability of outer two planets of v Andromedae is maintained by the corotation of the pericenters, which avoid the close approaches of two planets. The disturbance to the most inner planet from two outer planets is weak and the planetary system of the v Andromedae is stable. 3-1) When two planets of GJ876 have minimum mass estimated from the observation, this planetary system. The is stabilized only of 2 : 1 mean motion resonance. 3-2)When the two planets have much larger masses, they are stabilized by 2 : 1 mean motion resonance and the corotation of the pericenters
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Research Products
(16 results)