Short-Term Dynamical Interactions among Extrasolar Planets
Short-Term Dynamical Interactions among Extrasolar Planets
复制标题
系外行星之间的短期动力学相互作用
DOI：
10.1086/319847
复制
发表时间：
2001
期刊：
影响因子：
--
通讯作者：
J. Chambers
中科院分区：
文献类型：
--
作者：
G. Laughlin;J. Chambers
我们发现，在多个行星系统中的大质量行星之间的短期扰动可能会导致径向速度变化的中央星星，从假设行星执行独立的开普勒运动的速度变化有很大不同。我们讨论了两种拟合方法，可以导致一个改进的多行星系统的动力学描述。在第一种方法中，密切轨道要素确定通过Levenberg-Marquardt最小化方案驱动的N体积分。第二种方法是一种改进的分析模型，其中允许轨道要素根据行星之间共振相互作用的简单模型而变化。这两种方法都可以通过消除假设独立开普勒运动的拟合中固有的sin i简并来确定行星的真实质量。我们将我们的拟合方法应用于GJ 876径向速度数据，并认为这两颗行星的质量因子可能在1.25-2.0的范围内。
We show that short-term perturbations among massive planets in multiple planet systems can result in radial velocity variations of the central star that differ substantially from velocity variations derived assuming the planets are executing independent Keplerian motions. We discuss two fitting methods that can lead to an improved dynamical description of multiple planet systems. In the first method, the osculating orbital elements are determined via a Levenberg-Marquardt minimization scheme driving an N-body integrator. The second method is an improved analytic model in which orbital elements are allowed to vary according to a simple model for resonant interactions between the planets. Both of these methods can determine the true masses for the planets by eliminating the sin i degeneracy inherent in fits that assume independent Keplerian motions. We apply our fitting methods to the GJ 876 radial velocity data and argue that the mass factors for the two planets are likely in the 1.25-2.0 range.
影响因子：
3.2
作者：
V. Mannings;A. Boss;S. Russell
通讯作者：
V. Mannings;A. Boss;S. Russell