U.S.-Japan Cooperative Research: Structure and Evolution of Protogiant Planet Formation

美日合作研究：原巨行星形成的结构和演化

• 批准号: 9016785
• 负责人: Peter Bodenheimer
• 金额: $ 2.23万
• 依托单位: University of California-Santa Cruz
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1991
• 资助国家: 美国
• 起止时间: 1991-04-15 至 1994-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9016785&HistoricalAwards=false
• 关键词: U.S.; Japan; Cooperative; Research; Structure

This award will provide support for a two year cooperative research project on protogiant planet formation, between Professor Peter H Bodenheimer and colleagues at the Lick Observatory, University of California, Santa Cruz, and Professor Satoru Ikeuchi and colleagues from the National Astronomical Observatory, Japan. The formation of the solar system is one of the most important unsolved problems in astrophysics and planetary science. Recently accumulated observational data on the existence and evolution of protostellar disks around young stars seem to indicate that systems, similar to those that lead to the formation of the solar system, may be abundant, and that the formation of planetary systems may be an ongoing process instead of a long-ago event. The aim of this project is to is to undertake a theoretical investigation of the formation of giant planets to help interpret these observations. Giant planets are thought to have been initiated by the accumulation of small solid particles that existed in the primordial solar nebula. After the build up of this core to a few earth masses, it is believed that the protoplanet was able to gravitationally capture relatively large amounts of gas from the nebula, and that the final formation stages were dominated by gas accretion. It is intended during this project to analyze this process of gas accretion, using a three-dimensional hydrodynamic computer code. Through this analysis, it is hoped to determine the mass accretion rate as a function of time, the rate of accretion of spin angular momentum as a function of time, and the change in the location of the protoplanetary orbit as a function of time. Both the US and Japanese researchers involved in this collaboration have made intensive investigations into the general problem of the origin of the solar system and are highly regarded for their past research in the subject area. The research skills of the two groups are very complementary. If the research is successful it should give us some insight into how the final mass of giant planets was determined and how the regular satellite systems originated, and should provide a very valuable theoretical component to our understanding of the process of planet and solar system formation.

该奖项将为彼得·H·博登海默（Peter H Bodenheimer）教授与加利福尼亚大学圣克鲁斯分校的彼得·H·博登海默（Peter H Bodenheimer）教授和同事之间的两年合作研究项目提供支持。 太阳系的形成是天体物理学和行星科学中最重要的未解决问题之一。 最近积累了有关年轻恒星周围原恒星磁盘的存在和演变的观察数据似乎表明，类似于导致太阳系形成的系统类似，可能是丰富的，并且行星系统的形成可能是一个持续的过程而不是漫长的事件。 该项目的目的是对巨型行星的形成进行理论调查，以帮助解释这些观察结果。 人们认为，巨型行星是由原始太阳星云中存在的小固体颗粒的积累引发的。 在将该核心堆积到几个地球质量之后，据信，原始星et能够从星云中重力捕获相对较大的气体，并且最终的地层阶段以气体积聚为主。 该项目的目的是使用三维流体动力计算机代码分析这种气体积聚过程。通过此分析，希望确定质量吸积率是时间的函数，旋转角动量随时间的函数的积聚速率以及原球门轨道位置随时间的变化而变化。 参与这项合作的美国和日本研究人员都对太阳系起源的一般问题进行了深入的调查，并因其在学科领域的过去研究而受到高度评价。 两组的研究技能非常互补。 如果研究成功，它应该使我们了解如何确定巨型行星的最终质量，以及常规卫星系统的起源，并应为我们对行星和太阳系形成过程的理解提供非常有价值的理论组成部分。