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arXiv 2209.04542astro-ph.EP
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$μ$ Arae行星系统的轨道结构和稳定性

The orbital architecture and stability of the $μ$ Arae planetary system

Krzysztof Goździewski

摘要:

我们重新分析了$μ$ Arae行星系的全球轨道结构和动力学稳定性。我们已经更新了最佳拟合元素和行星的最小质量的基础上文献径向速度(RV)测量,现在跨越15年。这是2006年系统首次表征所用RV间隔的两倍。它由一颗土星和两颗小行星组成,它们的轨道类似于太阳系中的地球-火星-木星结构,以及近距离的温暖的海王星,质量约为地球的14倍。在这里,我们将这个早期的解决方案与最外层的时间限制为一个月。最佳拟合的牛顿模型的特点是最大质量行星的中等偏心率低于0.1,不确定性很小~0.02。它与类土星-木星对的2e:1b平均运动共振很接近,但有意义地分开,但可能接近弱三体MMR。该系统出现严格稳定的参数空间,覆盖了几个$σ$的不确定性在很宽的区域。该系统的稳定性是鲁棒的最小质量的五倍增加,与广泛的倾斜范围一致,从20到90度。这意味着所有行星的质量都安全地低于褐矮星的质量极限。我们发现了一个弱的统计指标可能的系统倾角I~20 - 30度。鉴于良好的约束轨道的解决方案,我们还调查了假设的碎片盘,这是类似的主带和柯伊伯带,并可能自然发生在这个系统的结构。

英文摘要:

We re-analyze the global orbital architecture and dynamical stability of the $μ$ Arae planetary system. We have updated the best-fit elements and minimal masses of the planets based on literature radial velocity (RV) measurements, now spanning 15 years. This is twice the RVs interval used for the first characterization of the system in 2006. It consists of a Saturn- and two Jupiter-mass planets in low-eccentric orbits resembling the Earth-Mars-Jupiter configuration in the Solar system, as well as the close-in warm Neptune with a mass of ~14 Earth masses. Here, we constrain this early solution with the outermost period to be accurate to one month. The best-fit Newtonian model is characterized by moderate eccentricities of the most massive planets below 0.1 with small uncertainties ~0.02. It is close but meaningfully separated from the 2e:1b mean motion resonance of the Saturn-Jupiter-like pair, but may be close to weak three-body MMRs. The system appears rigorously stable over a wide region of parameter space covering uncertainties of several $σ$. The system stability is robust to a five-fold increase in the minimal masses, consistent with a wide range of inclinations, from 20 to 90 deg. This means that all planetary masses are safely below the brown dwarf mass limit. We found a weak statistical indication of the likely system inclination I~20-30 deg. Given the well constrained orbital solution, we also investigate the structure of hypothetical debris disks, which are analogs of the Main Belt and Kuiper Belt, and may naturally occur in this system.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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