标题： 宜居带中的行星：对双星Gamma Cephei的研究 显示英文标题

标题： Planets in habitable zones: A study of the binary Gamma Cephei

摘要： 最近发现的双星GamCep中的行星系统被研究了其动力学演化。 我们确认观测者找到的轨道参数处于稳定配置中。 本研究的主要目的是在这个系统中寻找宜居区域内的稳定行星轨道，该系统包含一个双星（a=21.36 AU）和一个相对较近（a=2.15 AU）的巨行星（1.7 Mjup sin i）。 我们进行了不同动力学模型中运动方程的直接数值积分，并确定了在更高质量恒星周围半长轴0.5 AU < a < 1.85 AU区间内虚构无质量行星的稳定性区域。 为了验证结果，我们在单独计算中使用了快速李雅普诺夫指标（FLI），这是确定轨道混沌性的常用工具。 两个结果一致，并揭示了一个靠近1 AU的小稳定运动区域，直到约15度的倾角（这对应于两颗行星之间的3:1平均运动共振）。 此外，我们在小的稳定区域内计算了类地行星（最多90个地球质量）的轨道，并发现即使对于大质量行星，在GamCep宜居区的内边缘也存在一个稳定的轨道窗口。 显示英文摘要

摘要： The recently discovered planetary system in the binary GamCep was studied concerning its dynamical evolution. We confirm that the orbital parameters found by the observers are in a stable configuration. The primary aim of this study was to find stable planetary orbits in a habitable region in this system, which consists of a double star (a=21.36 AU) and a relatively close (a=2.15 AU) massive (1.7 Mjup sin i) planet. We did straightforward numerical integrations of the equations of motion in different dynamical models and determined the stability regions for a fictitious massless planet in the interval of the semimajor axis 0.5 AU < a < 1.85 AU around the more massive primary. To confirm the results we used the Fast Lyapunov Indicators (FLI) in separate computations, which are a common tool for determining the chaoticity of an orbit. Both results are in good agreement and unveiled a small island of stable motions close to 1 AU up to an inclination of about 15 deg (which corresponds to the 3:1 mean motion resonance between the two planets). Additionally we computed the orbits of earthlike planets (up to 90 earthmasses) in the small stable island and found out, that there exists a small window of stable orbits on the inner edge of the habitable zone in GamCep even for massive planets.