How planetary systems are shaped by their birthplace

行星系统如何由其诞生地塑造

• 批准号: 362583045
• 负责人: Professor Dr. Rainer Spurzem
• 金额: --
• 依托单位: Astronomisches Rechen-Institut
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2017
• 资助国家: 德国
• 起止时间: 2016-12-31 至 2021-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/362583045?language=en
• 关键词: How; planetary; systems; shaped; their

Thousands of exoplanets, including multiple systems, have been identified in recent years. The formation of planetary systems from protoplanetary disks and planetary embryos has been well studied, in particular how the observed diversity of planetary systems is generated by processes such as planet-planet scattering, secular evolution, and interaction between planets and gas/debris disks. Almost all of this work has focused on the formation and evolution of isolated planetary systems. The birth places of many if not all stars, however, is in a star cluster or association, which may either disperse after some time or remain an open cluster. Here we will study how planetary systems are shaped and reorganized by the external dynamical effects in their nascent star cluster by encounters with other stars. Planetary orbits will undergo to lowest order eccentricity changes which in turn may trigger internal instabilities of the entire planetary system. Planets escape or merge to their host star, or can be found on orbits very close to their host star. In this project we will examine the process in two ways - theoretically by studying a wide range of star clusters with planetary systems in the computer and analyze the resulting diversity of planetary systems; and inversely by identifying observable properties of planetary systems which can give clues about the conditions under which they were formed.

近年来，已经发现了数千颗系外行星，包括多个系统。行星系统从原行星盘和行星胚胎的形成已经得到了很好的研究，特别是观察到的行星系统的多样性是如何通过行星-行星散射，长期演化以及行星和气体/碎片盘之间的相互作用等过程产生的。几乎所有这些工作都集中在孤立行星系统的形成和演化上。然而，即使不是所有的恒星，也有许多恒星的诞生地是在一个星星团或星协中，这些恒星团或星协可能在一段时间后分散或保持一个疏散星团。在这里，我们将研究行星系统是如何形成和重组的外部动力学效应，在他们的新生星星集群遇到其他恒星。行星轨道将经历最低阶偏心率的变化，这反过来又可能引发整个行星系统的内部不稳定性。行星逃逸或合并到它们的宿主星星，或者可以在非常接近它们的宿主星星的轨道上被发现。在这个项目中，我们将从两个方面来研究这个过程--理论上通过在计算机中研究大范围的具有行星系统的星星团，并分析由此产生的行星系统的多样性;反之，通过识别行星系统的可观察特性，可以提供有关它们形成条件的线索。