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Ingassing of Hydrogen in the Interiors of Sub-Neptunes and Gas Giants

亚海王星和气态巨行星内部的氢气吸收

基本信息

批准号：
2108129
负责人：
Sang-Heon Shim
金额：
$ 32.06万
依托单位：
Arizona State University
依托单位国家：
美国
项目类别：
Continuing Grant
财政年份：
2021
资助国家：
美国
起止时间：
2021-08-01 至 2024-07-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=2108129&HistoricalAwards=false
关键词：
Ingassing Hydrogen Interiors Sub Neptunes

项目摘要

The interiors of large planets such as Jupiter, Saturn, or Neptune are at very high temperatures and pressures. The behavior at the boundary between hydrogen-rich atmospheres and mineral-rich cores under these conditions is not well understood. This project will perform experiments on Earth using high-pressure and high-temperature conditions to determine how hydrogen interacts and is possibly absorbed into the materials of the core. The results will help answer questions about the interiors and history of giant planets. The project will share their results through education at the university level as well as through public outreach events at Arizona State University.The project will use diamond anvil cells to subject silicates and iron metal alloys in hydrogen media to pressures up to 100 GPa and temperatures put to 4,600 K. The resulting reactions will be analyzed using time-resolution X-ray diffraction. The data from these experiments will help answer these key questions: (1) Can hydrogen be ingassed to the interiors through chemical reactions? (2) If ingassed, in what type of chemical forms would H exist (water, metal alloys, or hydrides)? (3) Can H ingassing alter the mass-radius relations of planets? and (4) Can such reactions be affected by the metallization of dense liquid hydrogen and therefore be planet size dependent? The project includes an undergraduate research program. Teaching modules for calculating mass-radius relations of planets will be developed and shared as an open-source teaching resource in public code repositories. Public outreach presentations will be made and campus-wide outreach events at Arizona State University.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

木星、土星或海王星等大型行星的内部温度和压力都很高。在这些条件下，富氢大气和富矿岩芯之间的边界处的行为还没有得到很好的理解。该项目将利用高压和高温条件在地球上进行实验，以确定氢如何相互作用并可能被吸收到核心的材料中。这些结果将有助于回答有关巨行星内部和历史的问题。该项目将通过大学教育以及亚利桑那州立大学的公共宣传活动分享他们的成果。该项目将使用金刚石砧座单元使氢介质中的硅酸盐和铁金属合金承受高达100 GPa的压力和4，600 K的温度。将使用时间分辨率X射线衍射分析所产生的反应。这些实验的数据将有助于回答这些关键问题：（1）氢可以通过化学反应进入内部吗？(2)如果被吸入，氢会以什么样的化学形式存在（水、金属合金或氢）？(3)吸氢能改变行星的质量-半径关系吗？以及（4）这些反应是否会受到稠密液态氢金属化的影响，从而取决于行星的大小？该项目包括一个本科生研究计划。将开发用于计算行星质量-半径关系的教学模块，并将其作为公共代码库中的开放源码教学资源共享。公共宣传演讲将在亚利桑那州立大学进行，并在校园范围内开展宣传活动。该奖项反映了NSF的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。