您的位置: 专家智库 > >

国家自然科学基金(s10833001)

作品数:3 被引量:2H指数:1
发文基金:国家自然科学基金国家教育部博士点基金国家重点基础研究发展计划更多>>
相关领域:天文地球自动化与计算机技术理学更多>>

文献类型

  • 3篇中文期刊文章

领域

  • 3篇天文地球
  • 1篇自动化与计算...
  • 1篇理学

主题

  • 2篇PLANET
  • 2篇GENERA...
  • 1篇NUMERI...
  • 1篇RI
  • 1篇STARS
  • 1篇CLUSTE...
  • 1篇DISK
  • 1篇FORMIN...
  • 1篇INDIVI...
  • 1篇METHOD...
  • 1篇PLANET...
  • 1篇ECCENT...
  • 1篇SILICA...
  • 1篇KEPLER
  • 1篇N-BODY
  • 1篇COMPAN...

传媒

  • 2篇Resear...
  • 1篇Scienc...

年份

  • 2篇2012
  • 1篇2009
3 条 记 录,以下是 1-3
排序方式:
Forming different planetary systems被引量:2
2012年
With the increasing number of detected exoplanet samples, the statistical properties of planetary systems have become much clearer. In this review, we sum- marize the major statistical results that have been revealed mainly by radial velocity and transiting observations, and try to interpret them within the scope of the classical core-accretion scenario of planet formation, especially in the formation of different orbital architectures for planetary systems around main sequence stars. Based on the different possible formation routes for different planet systems, we tentatively classify them into three major catalogs: hot Jupiter systems, standard systems and distant giant planet systems. The standard systems can be further categorized into three sub-types under different circumstances: solar-like systems, hot Super-Earth systems, and sub- giant planet systems. We also review the theory of planet detection and formation in binary systems as well as planets in star clusters.
Ji-Lin Zhou Ji-Wei Xie Hui-Gen Liu Hui Zhang Yi-Sui Sun
The silicate and carbon-rich models of CoRoT-7b,Kepler-9d and Kepler-10b
2012年
Possible bulk compositions of the super-Earth exoplanets CoRoT-7b, Kepler-9d, and Kepler-10b are investigated by applying a commonly used silicate model and a non-standard carbon model. Their internal structures are deduced using a suitable equation of state for the materials. The degeneracy problems of their compo- sitions can be partly overcome, based on the fact that all three planets are extremely close to their host stars. By analyzing the numerical results, we conclude: 1) the iron core of CoRoT-7b is not more than 27% of its total mass within lc~ mass-radius error bars, so an Earth-like composition is less likely, but its carbon rich model can be com- patible with an Earth-like core/mantle mass fraction; 2) Kepler-10b is more likely to have a Mercury-like composition, with its old age implying that its high iron content may be a result of strong solar wind or giant impact; 3) the transiting-only super-Earth Kepler-9d is also discussed. Combining its possible composition with the formation theory, we can place some constraints on its mass and bulk composition.
Yan-Xiang GongJi-Lin Zhou
Eccentricity modulation of a close-in planet by a companion:Application to GJ 436 system
2009年
GJ 436b is a Neptune-size planet with 23.2 Earth masses in an elliptical orbit of period 2.64 days and eccentricity 0.16. With a typical tidal dissipation factor(Q′~106) as that of a giant planet with convective envelope,its orbital circularization timescale under internal tidal dissipation is around 1 Ga,at least two times less than the stellar age(> 3 Ga). A plausible mechanism is that the eccentricity of GJ 436b is modulated by a planetary companion due to their mutual perturbation. Here we investigate this possibility from the dynamical viewpoint. A general method is given to predict the possible locations of the dynamically coupled companions,including nearby/distance non-resonant or mean motion resonance orbits with the first planet. Applying the method to GJ 436 system,we find it is very unlikely that the eccentricity of GJ 436b is maintained at the present location by a nearby/distance companion through secular perturbation or mean motion resonance. In fact,in all these simulated cases,GJ 436b will undergo eccentricity damp and orbital decay,leaving the present location within the stellar age. However,these results do not rule out the possible existence of planet companions in nearby/distance orbits,although they are not able to maintain the eccentricity of GJ 436b.
TONG XiaoZHOU JiLin
关键词:PLANETARY
共1页<1>
聚类工具0