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Hydrodynamic escape of multicomponent exoplanet atmospheres of terrestrial-type exoplanets

类地系外行星多组分系外行星大气的流体动力逃逸

基本信息

批准号：
2603120
负责人：
金额：
--
依托单位：
University of Oxford
依托单位国家：
英国
项目类别：
Studentship
财政年份：
2021
资助国家：
英国
起止时间：
2021 至无数据
项目状态：
未结题

来源：
https://gtr.ukri.org/projects?ref=studentship-2603120
关键词：
Hydrodynamic escape multicomponent exoplanet atmospheres

项目摘要

Terrestrial planets are defined as planets with a distinct condensed surface, which may be liquid, ice or rock. Such planets may be essentially free of atmosphere (such as Mercury), may have thin atmospheres in the sense of the atmosphere making up a small portion of the observable radius of the planet, or may have very thick envelopes, such as molecular hydrogen envelopes that may be accreted from the protoplanetary disks. Planetary atmospheres are sculpted by various atmospheric escape processes among which hydrodynamic escape is the most important in early stages of a planet's evolution. One important question is what kinds of atmospheres can survive (or be regenerated) on planets orbiting M stars, which are the most common form of star in the Univers, but provide an environment conducive to hydrodynamic escape when young. The goal of this project is to further the understanding of such escape, and particular the understanding of whether heavy species such as nitrogen (essential to life as we know it) can escape. This will be done by applying advanced computational methods to 1D compressible multispecies hydrodynamics, ultimately coupling the escape model to models of atmospheric chemistry and fluxes of constituents from a magma ocean at the lower boundary.There are no companies or formal collaborators involved, though of course the usual web of informal collaborators within and outside Oxford will be involved from time to time.

类地行星被定义为具有明显凝聚表面的行星，可能是液体、冰或岩石。此类行星可能基本上没有大气层（例如水星），可能具有稀薄的大气层（大气层构成行星可观测半径的一小部分），或者可能具有非常厚的包层，例如可能从原行星盘吸积的分子氢包层。行星大气是由各种大气逃逸过程塑造的，其中流体动力逃逸在行星演化的早期阶段是最重要的。一个重要的问题是，什么样的大气可以在绕 M 星运行的行星上生存（或再生），M 星是宇宙中最常见的恒星形式，但在年轻时提供了有利于流体动力逃逸的环境。该项目的目标是进一步了解这种逃逸，特别是了解诸如氮（我们所知的生命必需物质）之类的重物质是否可以逃逸。这将通过将先进的计算方法应用于一维可压缩多物种流体动力学，最终将逃逸模型与大气化学模型和下边界岩浆海洋的成分通量耦合起来来完成。没有公司或正式合作者参与，尽管牛津内外的非正式合作者网络通常会不时参与。