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Exo-Titans: Exploring Exoplanet Atmospheres through Titan Analogues

外泰坦：通过泰坦类似物探索系外行星大气

基本信息

批准号：
2843357
负责人：
金额：
--
依托单位：
University College London
依托单位国家：
英国
项目类别：
Studentship
财政年份：
2023
资助国家：
英国
起止时间：
2023 至无数据
项目状态：
未结题

来源：
https://gtr.ukri.org/projects?ref=studentship-2843357
关键词：
Exo Titans Exploring Exoplanet Atmospheres

项目摘要

The number of exoplanet discoveries has grown exponentially since the first discovery in 1992 to over 5,500 detections, thanks to dedicated space surveys such as Kepler. Super-Earths (planets up to 10 Earth masses) are the most abundant, yet very little is known about their properties. These planets often orbit M-dwarfs - ultracool stars that make up ~75% of the stellar population. The recent launch of the James Webb Space Telescope (JWST) will yield a new era of high-quality exoplanetary atmospheric data, offering an exceptional opportunity to study a range of novel environments. Super-Earths may retain hydrogen-rich envelopes and possess reducing atmospheres akin to Saturn's moon, Titan, which serves as an important laboratory for studying prebiotic chemistry. This project explores the atmospheres of terrestrial exoplanets orbiting M-dwarfs through modelling Titan-like analogues with the goal of interpreting key atmospheric features using upcoming data collected by JWST. Existing models based on Titan's photochemistry and dynamics will be updated and cross-validated to study the radiative effects of haze formation on exoplanetary climate and habitability. Modelling these "exo-Titan" atmospheres will unlock unique insights into the anoxic environment of the early Earth and broaden our understanding of the Earth's atmosphere and habitability through comparative climatology.

自从1992年首次发现系外行星以来，由于开普勒等专门的太空调查，发现的系外行星数量呈指数级增长，已超过5500个。超级地球（质量为地球10倍的行星）是最丰富的，但对它们的性质知之甚少。这些行星通常围绕m矮星运行，m矮星是一种超冷恒星，占恒星总数的75%左右。最近发射的詹姆斯·韦伯太空望远镜（JWST）将带来高质量的系外行星大气数据的新时代，为研究一系列新环境提供了难得的机会。超级地球可能会保留富氢的包裹层，并拥有类似于土星卫星土卫六的还原大气层，土卫六是研究生命前化学的重要实验室。该项目通过模拟类似泰坦的类似物来探索围绕m矮星运行的类地系外行星的大气，目的是利用JWST即将收集的数据来解释关键的大气特征。基于土卫六光化学和动力学的现有模型将得到更新和交叉验证，以研究雾霾形成对系外行星气候和可居住性的辐射影响。对这些“外土卫六”大气进行建模，将为早期地球的缺氧环境提供独特的见解，并通过比较气候学拓宽我们对地球大气和可居住性的理解。