两个可能具有2:1平运动共振结构系统的稳定性研究

摘要

通过分析现有视向速度资料提供的轨道拟合解,发现HD 155358和24 Sextanis两系统都有可能处于2:1平运动共振状态.主要讨论了两系统共振结构的动力学稳定性问题,计算了两系统最优拟合值1σ置信区间内大量样本的混沌指标?emax.结果表明:HD 155358系统长期稳定,不依赖于平运动共振的保护.但是,24 Sextanis系统如果要维持长期稳定,2:1平运动共振保护是必要条件.%Based on the existing orbital parameters determined with the radial ve-locity (RV) data, the planets in HD 155358 and 24 Sextanis systems are found possibly trapped in the 2:1 mean motion resonance (MMR), respectively. For each system, the dynamical behavior of the best-fitting solution is discussed, and the 1σ confidence around the best-fitting initial phase point is explored using the chaos indicator?emax. The results reveal that HD 155358 could be stable without the 2:1 MMR protection, but the case is different for 24 Sextanis system.