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Internal evolution and magnetic field generation in rocky planets

岩石行星的内部演化和磁场产生

基本信息

批准号：
20J13676
负责人：
BONATI Irene
金额：
$ 1.34万
依托单位：
Tokyo Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for JSPS Fellows
财政年份：
2020
资助国家：
日本
起止时间：
2020-04-24 至 2022-03-31
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-20J13676/
关键词：
Planetary interior Planetary magnetic field

项目摘要

My research consists of dynamics of Earth’s core, and the analysis of the evolution and longevity of magnetic activity on rocky planets beyond the solar system (i.e., exoplanets) having different masses and iron contents. I have focused on a specific boundary layer of Earth’s core, the so-called F-layer. Using current knowledge related to seismology, mineral physics, and geodynamics I have put together a model assessing the feasibility of several binary compositions of Earth’s core in matching present seismic observations, as well as their implications on the dynamics of Earth’s core. This study has been presented at several conferences (AGU, JpGU). The main finding of this study is that carbon and sulfur are likely not present as major alloying components in Earth’s core, whereas silicon and oxygen are two potential candidates. Their predominance in Earth’s core provides interesting implications for the driving force of convection in the liquid outer core, which is of thermal origin in the presence of oxygen and driven by chemical buoyancy for a silicon-rich core.I also developed a code describing the thermal evolution of the cores of rocky planets having different mass and iron content. This code has been used to analyze planetary core structures after accretion, as well as the evolution and lifetime of a magnetic field, and accepted to Journal of Geophysical Research: Planets. The main finding of this study is that both the bulk and mantle iron content are strongly determining the magnetic field lifetime of rocky planets.

我的研究包括地球核心的动力学，以及对太阳系以外岩石行星上磁场活动的演变和寿命的分析（即，系外行星）具有不同的质量和铁含量。我把重点放在地球核心的一个特定边界层上，即所谓的F层。利用目前的知识，地震学，矿物物理学和地球动力学，我已经把一个模型评估的可行性，几个二进制组成的地球的核心，在匹配目前的地震观测，以及它们对地球的核心动力学的影响。该研究已在多个会议上发表（AGU，JpGU）。这项研究的主要发现是，碳和硫不太可能是地核中的主要合金成分，而硅和氧是两个潜在的候选者。他们在地球核心的优势提供了有趣的影响对流的驱动力在液体外核，这是热起源的存在下的氧气和化学浮力驱动的富硅core.I还开发了一个代码描述的热演化的岩石行星的核心具有不同的质量和铁含量。该代码已被用于分析吸积后的行星核心结构，以及磁场的演化和寿命，并被《地球物理研究杂志：行星》接受。这项研究的主要发现是，体铁和地幔铁含量都强烈决定了岩石行星的磁场寿命。