Dynamics of the Outer Planets and Satellites

奖项编号：AST-0607306PI: William ward机构：西南研究所标题：外行星和卫星动力学摘要本研究是研究太阳系和一般行星系中巨行星及其卫星形成和动力学演化项目的延续。将进行三项具体任务，这些任务对我们了解行星/卫星系统具有广泛的影响。第一个重点是巨行星卫星的形成，并检查围绕一颗不断增长的气态巨行星的原卫星盘的演变，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持续供给的粘性演化的吸积盘（所谓的饥饿盘模型）中形成，置于行星本身最早演化的背景下，并评估该系统是否自然地经历了有利于它们形成和生存的条件。第二项任务是继续研究前体星云耗散期间的行星轨道进动，该进动引起长期共振扫掠，这是激发各种行星系统种群（如小行星和柯伊伯带）偏心和倾角的主要机制。用于确定共振位置和迁移速率的技术必须是可靠的，而过去模型的一个遗漏是，它们没有考虑嵌入行星所迫使的星云的任何运动。这项任务的目标是确定嵌入圆盘中的行星的自洽进动率，这些行星本身由于行星的扰动而被迫变得偏心，并利用这些进动率来预测共振点作为圆盘与行星质量比的函数。研究生和博士后将通过研讨会和直接指导的方式接受教育和培训。除了传统的传播方式外，在可能的情况下，PI还将通过包括科普杂志在内的更多公共渠道传播本研究的结果。

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.