地球与行星物理（英文）2018，Vol.2Issue(1)：22-39,18.DOI:10.26464/epp2018003
Efficient metal emissions in the upper atmospheres of close-in exoplanets
摘要
Abstract
Atmospheric escape is a key process controlling the long term evolution of planets. Radiative cooling competes for energy against atmospheric escape in planetary upper atmospheres. In this work, we use a population balance method and a Monte Carlo model to calculate the previously ignored emissions of metals (C, N, O and their ions) and compare them with radiative recombination of HII and Ly-α emission of HI, which are the most efficient cooling mechanisms currently recognized in the upper atmospheres of hot Jupiters. The results show that the emissions of C, N, O and their ions are strong non-linear functions of environmental parameters (temperature, density, etc.) and are likely to be efficient cooling mechanisms in the upper atmospheres of close-in exoplanets.关键词
exoplanet/upper atmosphere/emissionKey words
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..[J].地球与行星物理（英文）,2018,2(1):22-39,18.基金项目
We thank the anonymous reviewers for their constructive suggestions and comments, which helped to improve the quality of the paper. F. Tian thanks discussions with P. Judge and R. Wordsworth during the preparation of this work. L. Liu and F. Tian are supported by the National Natural Science Foundation of China (11661161014) and Tsinghua University Initiative Science Research Program (523001028). （11661161014）
