天文学进展2012，Vol.30Issue(1)：48-63,16.
太阳系外行星系统轨道参数的统计研究
A Statistical Survey of Orbital Parameters of Extra-Solar Planets System
摘要
Abstract
Since the first extra-solar planet around a Sun-like star was detected in 1995,the number of known extra-solar planets has been growing,which makes statistical surveys of characteristics of extra-solar planets and their host stars very important. By February 18 of 2011,527 planets had been discovered. In this paper, major techniques used for detections of extra-solar planets are introduced.Based on the physical and orbital parameters of these extra-solar planets, a statistical analysis has been carried out to investigate their properties, obtaining a number of meaningful conclusions.(1) The minimum mass of planets ranges from 0 to 25 Mjup, with a peak around 1 Mjup. There are very few planets beyond 12 Mjup.(2) A bimodality is shown in the period of extra-solar planets with peaks at 3 days and 300 days and a " flat" distribution in between.(3) There are very few large-mass planets beyond 0.03 AU and the proportion of large-mass planets become larger as the orbital semi-major axis increases.(4) The orbital semi-major axis and planet mass are two key factors that affect the orbital eccentricity of the planet. The orbital eccentricity decreases as the orbital semi-major axis and planet mass decreases.(5) For F-G-K stars, planets tend to be detected around metal-rich stars. When the star is more massive than the Sun, the mass of its planet is in direct proportion to the star's mass.(6) We have discussed the properties of low-mass ( M < 20 M⊕ ) planets and found that their orbital eccentricities are lower than 0.4.In this paper, we briefly introduce current models of planet formation and evolution and test the models with the derived statistical properties of planets. It therefore provides a reference for future detections of extra-solar planets.关键词
太阳系外行星/统计特性/行星形成Key words
extra-solar planet/detection method/statistical properties/planet formation分类
天文与地球科学引用本文复制引用
赵佳,赵刚..太阳系外行星系统轨道参数的统计研究[J].天文学进展,2012,30(1):48-63,16.基金项目
国家自然科学基金(10821061,10803010 （）
