Influence of different host stars upon the atmospheres of planets at the boundary of rocky and gas planets

不同主星对岩石行星和气体行星边界的行星大气层的影响

• 批准号: 329164484
• 负责人: Dr. Mareike Godolt
• 金额: --
• 依托单位: Zentrum für Astronomie und Astrophysik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2017
• 资助国家: 德国
• 起止时间: 2016-12-31 至 2019-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/329164484?language=en
• 关键词: Influence; different; host; stars; upon

A major issue in exoplanet science is to determine the nature of planets at the boundary of rocky and gaseous planets. To achieve this, the key processes which determine their atmospheres and their spectral appearance need to be understood. The atmospheres of these planets are accessible by current and near future instruments if they orbit nearby, bright stars. These planets orbit different types of stars and the origin of their atmospheres may be diverse, formed e.g. by accretion from the stellar nebula, sublimation of ices and/or outgassing from the interior.This project therefore aims at understanding the influence of different host stars and atmospheric origins upon the atmospheres of planets in the sub-Neptunian mass-radius regime and their spectral appearance. It will determine whether and which spectral signatures can be used to distinguish between mainly rocky and gaseous planets.To study the impact of different stars a coupled atmosphere model is needed hat accounts for the influence of different stellar irradiation upon the atmospheric temperatures and composition. A new coupled atmosphere model will be developed which calculates the atmospheric temperatures via radiative and convective energy transport, utilizing a line-by-line radiative transfer model. This radiative-convective model will be coupled to equilibrium and non-equilibrium chemistry models to consider the impact of the temperature structure and the stellar irradiation upon the atmospheric chemical composition. From the resulting atmospheric profiles the spectral appearance of these planets and the detectability of spectral features with current and future instruments will be determined.

系外行星科学的一个主要问题是确定岩石行星和气态行星边界处的行星性质。为了实现这一目标，需要了解决定其大气和光谱外观的关键过程。如果这些行星绕着附近明亮的恒星运行，当前和不久的将来的仪器就可以接近它们的大气层。这些行星围绕不同类型的恒星运行，其大气层的起源可能各不相同，例如形成于大气层中。通过恒星星云的吸积、冰的升华和/或内部的排气。因此，该项目旨在了解不同的主恒星和大气起源对海王星以下质量半径范围内的行星大气及其光谱外观的影响。它将确定是否以及哪些光谱特征可用于区分主要是岩石行星和气态行星。为了研究不同恒星的影响，需要一个耦合大气模型来解释不同恒星辐射对大气温度和成分的影响。将开发一种新的耦合大气模型，利用逐行辐射传输模型，通过辐射和对流能量传输来计算大气温度。该辐射对流模型将与平衡和非平衡化学模型耦合，以考虑温度结构和恒星辐射对大气化学成分的影响。根据所得的大气剖面，将确定这些行星的光谱外观以及当前和未来仪器的光谱特征的可检测性。

项目成果

What Factors Affect the Duration and Outgassing of the Terrestrial Magma Ocean?

哪些因素影响陆地岩浆海的持续时间和释气？

• DOI: 10.3847/1538-4357/ab08ed
• 发表时间: 2019
• 期刊: The Astrophysical Journal
• 作者: Nikolaou;Katyal;Godolt;Grenfell
• 通讯作者: Grenfell

The habitability of stagnant-lid Earths around dwarf stars

矮星周围静止盖地球的宜居性

• DOI: 10.1051/0004-6361/201834658
• 发表时间: 2019
• 期刊: Astronomy & Astrophysics
• 影响因子: 6.5
• 作者: Godolt;Stracke;Grenfell;Ruedas
• 通讯作者: Ruedas

Evolution and Spectral Response of a Steam Atmosphere for Early Earth with a Coupled Climate–Interior Model

具有耦合气候-内部模型的早期地球蒸汽大气的演化和光谱响应

• DOI: 10.3847/1538-4357/ab0d85
• 发表时间: 2019
• 期刊: The Astrophysical Journal
• 作者: Katyal;Nikolaou;Godolt;Grenfell;Schreier
• 通讯作者: Schreier

Machine-learning Inference of the Interior Structure of Low-mass Exoplanets

• DOI: 10.3847/1538-4357/ab5d32
• 发表时间: 2019-11
• 期刊: The Astrophysical Journal
• 作者: P. Baumeister;S. Padovan;N. Tosi;G. Montavon;N. Nettelmann;J. MacKenzie;M. Godolt