标题： HR 8799 颤动盘：由行星迁移和可能的第五颗最外层行星塑造 显示英文标题

标题： The HR 8799 Debris Disc: Shaped by Planetary Migration and a Possible Fifth Outermost Planet

摘要： 上下文。 HR 8799系统拥有四颗巨行星，位于温暖和冷的星环之间，并有一个延伸的尘埃尾部，这为研究行星形成和演化提供了一个理想的实验室。 星环已在各种波长下被观测到，行星特性也得到了很好的约束。 然而，关于行星在塑造星环中的作用仍存在未解的问题。 目标。 我们通过研究该系统的演化，旨在了解行星迁移如何在行星和星环方面塑造其结构。 方法。 我们进行了$N$-体模拟来模拟HR 8799系统。 我们通过在气态盘中进行简单、强制迁移的过程中考察已知的四颗超级木星行星的轨道演化，同时它们扰动一个外部的无质量小天体盘。 我们还探讨了引入第五颗行星对星环的动力学和形态学方面的影响。 结果。 由于与气态盘的强制相互作用，行星向外迁移，同时保持其共振构型。 这种向外迁移激发了小天体盘，产生了一个瞬时的散射种群。 虽然四行星系统部分再现了恒星和冷星环之间的观测空腔，但引入一颗第五颗低质量行星似乎对于更好地再现冷星环的关键形态特征至关重要。 结论。 这个模型为HR 8799的结构提供了一种新的解释。 向外的行星迁移，结合平均运动共振相互作用和一颗第五颗低质量行星，可以有效地复制观测到的行星结构和冷星环特征。 我们的发现强调了行星迁移在塑造星环中的潜在重要作用。 显示英文摘要

摘要： Context. The HR 8799 system, hosting four giant planets between a warm and cold debris disc, and an extended dusty tail beyond, serves as an ideal laboratory for studying planetary formation and evolution. The debris discs have been observed across various wavelengths, and the planetary properties are well-constrained. Nonetheless, there are still open questions regarding the role of the planets in shaping the debris discs. Aims. We investigate the system's evolution with the aim of understanding how planetary migration shapes its architecture, both in terms of planets and the disc. Methods. We performed $N$-body simulations to model the HR 8799 system. We examined the orbital evolution of the known four super-Jupiter planets through the course of simple, imposed migration in a gaseous disc as they perturb an external, massless planetesimal disc. We also explore the impact of introducing a fifth planet on the dynamical and morphological aspects of the disc. Results. The planets migrate outward as a result of their imposed interactions with the gaseous disc while maintaining their resonant configuration. This outward migration excites the planetesimal disc, producing a transient scattered population. While a four-planet system partially reproduces the observed cavity between the star and the cold debris disc, the inclusion of a fifth low-mass planet appears to be crucial for better reproducing key morphological aspects of the cold debris disc. Conclusions. This model provides a novel explanation for the architecture of HR 8799. Outward planetary migration, combined with mean motion resonant interactions and a fifth, low-mass planet, can effectively replicate the observed planetary architecture and cold debris disc characteristics. Our findings underscore the potential important role of planetary migration in shaping debris discs.