Tidal stimulation of the formation of the outer planets

潮汐刺激外行星的形成

• 批准号: 146187319
• 负责人: Professor Dr. Pavel Kroupa
• 金额: --
• 依托单位: Helmholtz-Institut für Strahlen- und Kernphysik
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2010
• 资助国家: 德国
• 起止时间: 2009-12-31 至 2013-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/146187319?language=en
• 关键词: Tidal; stimulation; formation; outer; planets

Planet formation is a key issue in current astronomy and astrophysics, and as such it is subject to ongoing debates. An increasing amount of observational data on extrasolar planetary systems repeatedly challenges theoretical models. While many details on the basic mechanisms of forming planetesimals from dust and protoplanets from planetesimals are still unclear, there is increasing evidence for fingerprints of a dense dynamical birth environment of planetary systems like ours. The discoveries of exoplanets on strongly eccentric and/or misaligned orbits suggest even more complex dynamics in forming planetary systems than previously thought. Even our Sun exhibits a modest misalignment of 7degree wrt. the ecliptic plane, and, besides the eight regular planets, our Solar Systems also hosts a variety of minor planets on distant and eccentric orbits (e.g. Sedna). Their origin poses a challenge to current planet formation theory. The project which I am herewith applying for focuses on an attempt to understand these peculiar features of our Solar System through a yet rarely attended scenario of tidal perturbations of protoplanetary discs and material exchange in gas-rich star-forming environments, which may have played an important role in the formation of the Edgeworth-Kuiper Belt. In particular, transient vortices caused by the tidal forces by passing stars in the birth cluster or by the inflow of gas from dense structures inside the star-forming region and the possibility of enhanced dust coagulation inside these vortices will be analysed. In addition, the consequences of repeated accretion due to disc perturbations on the Solar chemistry, particularly the observed Lithium depletion, will be studied. To my knowledge no other group is working on this environment-driven ansatz to explain the peculiar features of the Solar System.

行星形成是当前天文学和天体物理学的一个关键问题，因此它受到持续辩论的影响。越来越多的太阳系外行星系统观测数据不断挑战理论模型。虽然从尘埃中形成微行星和从微行星中形成原行星的基本机制的许多细节仍然不清楚，但越来越多的证据表明，像我们这样的行星系统的密集动力学诞生环境的指纹。在强烈偏心和/或错位轨道上发现的系外行星表明，形成行星系统的动力学比以前认为的更为复杂。甚至我们的太阳也显示出适度的7度wrt偏差。黄道面，除了八颗规则行星外，我们的太阳系还拥有各种位于遥远和偏心轨道上的小行星（例如塞德娜）。它们的起源对目前的行星形成理论提出了挑战。我在此申请的项目的重点是试图了解我们太阳系的这些特殊特征，通过一个很少有人关注的场景，即原行星盘的潮汐扰动和富含气体的恒星形成环境中的物质交换，这可能在埃奇奥尔-柯伊伯带的形成中发挥了重要作用。特别是，将分析由出生星团中经过的恒星的潮汐力或恒星形成区域内致密结构的气体流入所造成的瞬态涡旋，以及这些涡旋内增强尘埃凝结的可能性。此外，由于盘扰动对太阳化学的重复吸积的后果，特别是观察到的锂耗尽，将进行研究。据我所知，没有其他小组正在研究这种环境驱动的解释太阳系独特特征的方法。