共振系统HD 73526的稳定性和形成
Stability and Formation of the Resonant System HD 73526
摘要：
根据径向速度测量，最近发现HD 73526周围的两颗巨行星处于2：1共振状态。然而，正如我们的数值积分所示，该系统的导出轨道数据导致巨行星的混沌行为，这在共振太阳系外行星系统中是罕见的。我们打算提出定期（非混乱）的巨行星系统HD 73526的轨道解，并提供形成方案的基础上结合行星迁移和突然的扰动效应，如行星行星散射或快速分散的原行星盘。与已经研究的谐振系统HD 128311，表现出类似的行为，也做了比较。系统控制台（www.oklo.org）推导出了新的轨道解集。这些解决方案的稳定性进行了研究的相对李雅普诺夫指标，而迁移和散射的影响进行了研究的重力N体模拟应用非保守力以及。此外，流体动力学模拟嵌入行星在原行星盘进行后续的捕获到共振。对于系统HD 73526，我们证明，观测径向速度数据是一致的，从事一个稳定的2：1共振共面行星系统表现出拱线共转。我们已经证明，类似于系统HD 128311，HD 73526目前的动力学状态可能是混合演化过程的结果，将行星迁移和微扰事件融合在一起。
英文摘要：
Based on radial velocity measurements it has been found recently that the two giant planets detected around the star HD 73526 are in 2:1 resonance. However, as our numerical integration shows, the derived orbital data for this system result in chaotic behavior of the giant planets, which is uncommon among the resonant extrasolar planetary systems. We intend to present regular (non-chaotic) orbital solutions for the giant planets in the system HD 73526 and offer formation scenarios based on combining planetary migration and sudden perturbative effects such as planet-planet scattering or rapid dispersal of the protoplanetary disk. A comparison with the already studied resonant system HD 128311, exhibiting similar behavior, is also done. The new sets of orbital solutions have been derived by the Systemic Console (www.oklo.org). The stability of these solutions has been investigated by the Relative Lyapunov indicator, while the migration and scattering effects are studied by gravitational N-body simulations applying non-conservative forces as well. Additionally, hydrodynamic simulations of embedded planets in protoplanetary disks are performed to follow the capture into resonance. For the system HD 73526 we demonstrate that the observational radial velocity data are consistent with a coplanar planetary system engaged in a stable 2:1 resonance exhibiting apsidal corotation. We have shown that, similarly to the system HD 128311, the present dynamical state of HD 73526 could be the result of a mixed evolutionary process melting together planetary migration and a perturbative event.
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