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arXiv 2009.07006astro-ph.EP
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HR 8799行星系的精确广义拉普拉斯共振

An exact, generalised Laplace resonance in the HR 8799 planetary system

Krzysztof Gozdziewski, Cezary Migaszewski

摘要:

HR 8799周围的四颗超级木星行星系统是通过直接成像技术发现的第一个多行星配置。尽管经过了十多年的研究,该系统的架构仍然没有完全解决。主要的困难来自于仍然狭窄的观测窗口,大约20年,覆盖周期约为50至500年的小弧轨道。在发现后不久,人们就清楚地发现,由于~10- 1000质量的伴星之间强烈的相互引力相互作用,无约束的最佳拟合天体测量构型会迅速地自我分裂。最近,我们证明了HR 8799系统在锁定在广义Laplace 8:4:2:1平均运动共振(MMR)链中时可能是长期稳定的,并且我们通过行星迁移来限制它的轨道。在这里,我们定性地改进这种方法,考虑MMR的一个确切的周期性配置。这一假设使我们能够构建的第一次自洽的$N$体模型的长期稳定的轨道结构,只使用现有的天体测量位置的行星相对于恒星。我们独立地确定行星质量,这与热力学演化是一致的,视差重叠到$1σ$与最近的盖亚DR 2值。我们还确定了[8,600] au范围内的内部和外部碎片盘的全球结构,与更新的轨道解一致。

英文摘要:

A system of four super-Jupiter planets around HR 8799 is the first multi-planet configuration discovered via the direct imaging technique. Despite over decade of research, the system's architecture remains not fully resolved. The main difficulty comes from still narrow observing window of ~20 years that covers small arcs of orbits with periods from roughly 50 to 500 years. Soon after the discovery it became clear that unconstrained best-fitting astrometric configurations self-disrupt rapidly, due to strong mutual gravitational interactions between ~10-Jupiter-mass companions. Recently, we showed that the HR 8799 system may be long term stable when locked in a generalized Laplace 8:4:2:1 mean motion resonance (MMR) chain, and we constrained its orbits through the planetary migration. Here we qualitatively improve this approach by considering the MMR in terms of an exactly periodic configuration. This assumption enables us to construct for the first time the self-consistent $N$-body model of the long-term stable orbital architecture, using only available astrometric positions of the planets relative to the star. We independently determine planetary masses, which are consistent with thermodynamic evolution, and the parallax overlapping to $1σ$ with the most recent GAIA DR2 value. We also determine the global structure of the inner and outer debris discs in the [8, 600] au range, consistent with the updated orbital solution.

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