Computer Simulation of Hydrogen and Helium in the Interior of Giant Planets

巨行星内部氢和氦的计算机模拟

• 批准号: 0507321
• 负责人: Burkhard Militzer
• 金额: $ 17.87万
• 依托单位: Carnegie Institution of Washington
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-07-15 至 2008-02-29
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0507321&HistoricalAwards=false
• 关键词: Computer; Simulation; Hydrogen; Helium; Interior

AST-0507321Burkhard MilitzerCarnegie Institution of WashingtonComputer Simulation of Hydrogen and Helium in the Interior of Giant PlanetsABSTRACTAn improved equation of state for hydrogen-helium mixtures at high temperatures and pressures will be developed. This will be accomplished using newly developed first principle techniques employing many body simulations (path integral Monte Carlo techniques at higher temperatures and density functional molecular dynamics at lower temperatures). The results will be applied to three outstanding problems in planetaryastronomy:1) Does Jupiter have a core and did it emerge from core accretion?2) What are the properties of the metallic to molecular transition in hydrogen inside giant planets and how does it affect the distribution of helium?3) What mechanism prolonged Saturn's cooling (observed to be twice as long aspredicted)?Moreover, equations of state for degenerate hydrogen-helium mixtures developed here will be critical components in models of extrasolar giant planets. These results are expected to significantly improve our ability to constrain the physical properties of these planets from transit and radial velocity data.The final equations of state and the software to interpolate among them will be placed on the web for public use.One post-doctoral fellow will be supported and undergraduates will be included in the research as part of a Research Experiences for Undergraduates Site program. One post-doctoral fellow will be supported and undergraduates will be included in the research as part of a Research Experiences for Undergraduates Site program.

AST-0507321BURKHARD MILITZERCARNEGIE WashingtonComputer机构在巨型Planetsabtractan内部对氢和氦气的模拟，在高温和压力下改善了用于高温和压力下的氢氢混合物的状态方程。这将使用新开发的第一原理技术采用许多人体模拟（路径积分蒙特卡洛技术在较高的温度下和较低温度下的密度功能分子动力学）来实现。该结果将应用于行星术中的三个未出现的问题：1）木星是否具有核心，并且它是从核心积聚中出现的吗？2）金属在巨大行星内氢中金属的特性到分子过渡的特性，它如何影响它氦的分布​​？3）延长土星冷却的哪些机制（观察到的时间是呈预测的两倍）？此外，这里开发的退化氢己方程的状态方程将是外极巨型行星模型中的关键组成部分。这些结果有望显着提高我们从运输和径向速度数据限制这些行星物理特性的能力。状态和软件的最终方程将放在网络上，以供公共使用。研究员将得到支持，并将在研究中包括本科生，这是本科生现场计划的研究经验的一部分。一名博士后研究员将得到支持，并将在研究中包括本科生，这是本科生现场计划的研究经验的一部分。