权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Revealing atmospheric structures, clouds and chemistry of brown dwarfs and free-floating planetary mass objects

揭示褐矮星和自由漂浮行星质量物体的大气结构、云层和化学成分

基本信息

批准号：
2277637
负责人：
金额：
--
依托单位：
University of Hertfordshire
依托单位国家：
英国
项目类别：
Studentship
财政年份：
2019
资助国家：
英国
起止时间：
2019 至无数据
项目状态：
已结题

来源：
https://gtr.ukri.org/projects?ref=studentship-2277637
关键词：
Revealing atmospheric structures clouds chemistry

项目摘要

Spectral inversion techniques, also known as atmospheric retrievals, were first developed for remote sensing the Earth's atmospheric conditions, and have now been applied to Solar system planets, exoplanets and brown dwarfs. In this project you will use Ben Burningham's atmospheric retrieval framework ("Brewster": http://adsabs.harvard.edu/abs/2017MNRAS.470.1177B) to estimate atmospheric structure, chemistry and cloud properties of brown dwarfs, isolated planetary mass objects and planetary mass companions to stars. The results of this will then be used to test predictions from fully self-consistent radiative-convective equilibrium models and identify shortcomings in our understanding of the atmospheric physics of giant exoplanets and brown dwarfs. There is scope for the student to identify new lines of enquiry; however, promising examples include: testing for departures from chemical equilibrium and evaluating disequilibrium effects as a function of gravity; revealing cloud properties such as condensate species, cloud structure, particle sizes; testing predictions for thermal structure across a range of temperatures. These projects will initially exploit archival data, but new data will extend to new data sets as they become available. Atmospheric retrievals using Brewster will also play a key role in analysing data from the James Webb Space Telescope (JWST) following its launch in spring 2021.

光谱反演技术，也被称为大气反演，最初是为了遥感地球的大气状况而开发的，现在已经应用于太阳系行星，系外行星和褐矮星。在这个项目中，你将使用本·伯宁厄姆的大气检索框架（“布鲁斯特”：http：//adsabs.harvard.edu/abs/2017MNRAS.470.1177 B）来估计大气结构，化学和褐矮星，孤立的行星质量物体和行星质量的恒星同伴的云属性。其结果将用于测试完全自洽的辐射-对流平衡模型的预测，并确定我们对巨型系外行星和褐矮星大气物理学理解的不足之处。学生有机会确定新的调查路线;然而，有希望的例子包括：测试偏离化学平衡和评估不平衡效应作为重力的函数;揭示云的性质，如冷凝物种类，云结构，颗粒大小;测试预测在一个温度范围内的热结构。这些项目最初将利用档案数据，但随着新数据的出现，将扩大到新的数据集。使用布鲁斯特进行的大气检索也将在分析詹姆斯韦伯太空望远镜（JWST）于2021年春季发射后的数据方面发挥关键作用。