Evolutionary Models of Young Jupiters and Hot Jupiters

年轻木星和热木星的演化模型

• 批准号: 0607489
• 负责人: Jonathan Fortney
• 金额: $ 19.74万
• 依托单位: SETI 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 2008-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0607489&HistoricalAwards=false
• 关键词: Evolutionary; Models; Young; Jupiters; Hot

The research to be conducted here centers around models for the structure and evolutionof giant planets which can be used to relate observations of giant exoplanets tofundamental properties such as mass and radius. First, a modeling effort will beundertaken to compute the thermal evolution of young giant planets over a range ofmasses in a self-consistent way, i.e., coupled with core accretion models, rather than withthe arbitrary initial conditions currently used. From these models, both spectra and colorswill be calculated to allow for more accurate determinations of the masses of youngobjects found orbiting other stars. A second project will explore recent revisions in theequation of state for hydrogen to evaluate the corresponding changes in model radius. Itis suggested that this change leads to larger radii at a given age and that the wide spreadin radii seen among transiting extrasolar giant planets may be understood in terms of alarge range in interior heavy element abundances versus the need for internal energysources.This work will improve the return of future space missions to locate extrasolar planets aswell as efforts from the ground by enabling more accurate determinations of basicproperties from observations. The models here will also serve as a stepping stone to theeventual detection of Earth-like planets. The results of this work will be posted on theSETI Institute website and disseminated to the public through articles in popular journals.

这里要进行的研究以巨行星的结构和演化模型为中心，该模型可用于将巨系外行星的观测与质量和半径等基本属性联系起来。首先，将进行建模工作，以自洽的方式计算年轻巨行星在一定质量范围内的热演化，即与核心吸积模型相结合，而不是与当前使用的任意初始条件相结合。根据这些模型，光谱和颜色都将被计算出来，以便更准确地确定绕其他恒星运行的年轻天体的质量。第二个项目将探索氢状态方程的最新修订，以评估模型半径的相应变化。有人认为，这种变化导致了给定年龄的半径更大，凌日系外巨行星的半径分布范围很广，可以理解为内部重元素丰度的大范围变化与内部能源的需求之间的关系。这项工作将改善未来太空任务的返回将定位太阳系外行星，以及通过地面观测更准确地确定基本属性的努力。这里的模型也将作为最终探测类地行星的垫脚石。这项工作的结果将发布在 SETI 研究所网站上，并通过流行期刊上的文章向公众传播。