Dynamics of the Outer Planets and Satellites

外行星和卫星的动力学

• 批准号: 0607306
• 负责人: William Ward
• 金额: --
• 依托单位: Southwest Research Institute
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-09-01 至 2009-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0607306&HistoricalAwards=false
• 关键词: Dynamics; Outer; Planets; Satellites

AWARD NO: AST-0607306PI: William WardINSTITUTION: Southwest Research InstituteTITLE: The Dynamics of the Outer Planets and SatellitesABSTRACTThis research is a continuation of a project to study the formation and dynamical evolution of giant planets and their satellites both in our own solar system and in planetary systems in general. Three specific tasks will be undertaken which have broad implications for our understanding of planetary/satellite systems. The first focuses on the formation of giant planet satellites and examines the evolution of a proto-satellite disk orbiting a growing gas giant planet in order to develop and evaluate a new model of satellite formation. The objective is to place the formation of Jupiter's Galilean satellites from a continuously fed, viscously evolving accretion disk (the so-called starved disk model) within the context of the earliest evolution of the planet itself, and to assess whether the system naturally passes through conditions favorable to their formation and survival. The second task is the continuation of a study of planetary orbital precessions during the dissipation of a precursor nebula which causes secular resonance sweeping, a leading mechanism for the excitation of eccentricities and inclinations of various planetary system populations, such as the asteroid and Kuiper belts. It is essential that the technique used to ascertain resonance locations and migration rates be reliable, and an omission of past models is that they have not considered any motion of the nebula forced by embedded planets. The objective of this task is to determine self-consistent precession rates for planets embedded in disks that are themselves forced to become eccentric in response to planetary perturbations, and use these rates to predict the resonance sites as a function of disk-to-planet mass ratio.Graduate students and post-doctoral fellows will be educated and trained by this work through workshops and direct supervision. In addition to traditional dissemination methods, when possible, the PI will also communicate the results of this study through more public channels including popular science magazines.

奖项编号：AST-0607306PI：William WardInstuttion：西南研究院TITLE：外行星和卫星的动力学研究这项研究是一个项目的继续，该项目旨在研究我们自己的太阳系和整个行星系统中巨行星及其卫星的形成和动力学演化。将开展对我们了解行星/卫星系统有广泛影响的三项具体任务。第一个重点是巨行星卫星的形成，并审查了围绕不断增长的气态巨行星运行的原始卫星盘的演变，以开发和评估卫星形成的新模型。其目的是将木星的伽利略卫星从一个连续馈送的、粘性演化的吸积盘(所谓的饥饿盘模型)形成的过程放在该行星本身最早演化的背景下，并评估该系统是否自然地通过有利于它们形成和生存的条件。第二项任务是继续研究前驱星云消散期间的行星轨道进动，该星云引起长期共振扫描，这是激发小行星和柯伊伯带等各种行星系统人口偏心和倾斜的主要机制。用于确定共振位置和迁移率的技术必须是可靠的，而过去的模型的一个遗漏是，它们没有考虑到由嵌入的行星所强迫的星云的任何运动。这项任务的目标是确定嵌入在圆盘中的行星的自洽进动率，这些行星本身由于行星扰动而被迫变得偏心，并使用这些进动率来预测作为圆盘与行星质量比的函数的共振点。研究生和博士后研究员将通过研讨会和直接指导通过这项工作来教育和培训。除了传统的传播方式外，在可能的情况下，国际和平研究所还将通过包括科普杂志在内的更多公共渠道传播这项研究的结果。