论文标题
部分可观测时空混沌系统的无模型预测
Kepler-80 Revisited: Assessing the Participation of a Newly Discovered Planet in the Resonant Chain
论文作者
论文摘要
在本文中，我们考虑了Kepler-80系统中的共振链，并评估了Sallue＆Vanderburg（2018）发现的谐振链的附加成员对系统动力学的影响以及可以通过拟合对过境时定时量变种（TTTVS）恢复的物理参数的影响。最终，在假设所有行星的偏心度为零时，我们将开普勒80 g的质量计算为0.8 \ pm 0.3 m_ \ oplus $，而放松该假设时，我们的质量为$ 1.0 \ pm 0.3 \ m _ {\ m _ {\ oplus} $。我们表明，外部五个行星是连续的三体平均谐振（MMR）。我们评估了系统中两体MMR的当前状态，发现行星似乎不在两体MMR中。我们发现，尽管谐振链的附加成员的存在并不能显着改变Kepler-80三体MMR的特征，但它可以改变从TTVS得出的物理参数，这表明在从TTV中得出结论时，应谨慎行事，以确定潜在的不完整系统。我们还将我们的结果与MacDonald等人的结果进行了比较。 （2021），他们在同一系统上使用不同的方法进行了类似的分析。尽管这项工作的结果和MacDonald等人。 （2021）表明，不同的合适方法和基本假设可能导致不同的测量轨道参数，最安全的结论是，在所有分析方面都保持真实：Kepler-80包含三体MMR中的行星链，但在两体MMR中不包含一系列行星。
In this paper, we consider the chain of resonances in the Kepler-80 system and evaluate the impact that the additional member of the resonant chain discovered by Shallue & Vanderburg (2018) has on the dynamics of the system and the physical parameters that can be recovered by a fit to the transit timing variations (TTVs). Ultimately, we calculate the mass of Kepler-80 g to be $0.8 \pm 0.3 M_\oplus$ when assuming all planets have zero eccentricity, and $1.0 \pm 0.3 \ M_{\oplus}$ when relaxing that assumption. We show that the outer five planets are in successive three-body mean-motion resonances (MMRs). We assess the current state of two-body MMRs in the system and find that the planets do not appear to be in two-body MMRs. We find that while the existence of the additional member of the resonant chain does not significantly alter the character of the Kepler-80 three-body MMRs, it can alter the physical parameters derived from the TTVs, suggesting caution should be applied when drawing conclusions from TTVs for potentially incomplete systems. We also compare our results to those of MacDonald et al. (2021), who perform a similar analysis on the same system with a different method. Although the results of this work and MacDonald et al. (2021) show that different fit methodologies and underlying assumptions can result in different measured orbital parameters, the most secure conclusion is that which holds true across all lines of analysis: Kepler-80 contains a chain of planets in three-body MMRs but not in two-body MMRs.
