GJ876行星系统中潜在类地行星研究

The Study of the Earth-like Planets in the GJ876 Planetary System

用数值积分方法模拟探讨了GJ876行星系统中存在潜在类地行星的可能性．结果表明分别产生于内外两颗巨行星的长期共振v1和v2可激发类地行星（其轨道半长轴分布在0．21AU≤α〈0．50AU之间）的偏心率，并使它们在极短时间内被抛射出系统．然而，从动力学角度而言，类地行星潜在存在区域可分布在0．50AU≤α≤1．00AU之间，其能在系统中10^5年时间尺度上稳定地存在．

The numerical simulations to investigate the Earth-like planets in the GJ 876 planetary system is performed. It shows that the secular resonances v1 and v2 （respectively, resulting from the inner and outer giant planets） can excite the eccentricities of the Earth-like planets with orbits 0.21 AU ≤α 〈 0.50AU and render them eject out from the system in short time. However, in a dynamical sense, the potential zones for the existence of Earth-like planets are in the region 0.50 AU ≤α 〈 1.00 AU, and there exist all stable orbits last up to 105 yr with low eccentricities.