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High-resolution transmission spectrum of the Earth's atmosphere-seeing Earth as an exoplanet using a lunar eclipse

文献类型：期刊论文

作者Yan, F.1,2,3; Fosbury, R. A. E.3; Petr-Gotzens, M. G.3; Zhao, G.1; Wang, W.1; Wang, L.1; Liu, Y.1; Palle, E.4,5
刊名INTERNATIONAL JOURNAL OF ASTROBIOLOGY
出版日期2015-04-01
卷号14期号:2页码:255-266
关键词atmospheres eclipse Earth planets and satellites
英文摘要With the rapid developments in the exoplanet field, more and more terrestrial exoplanets are being detected. Characterizing their atmospheres using transit observations will become a key datum in the quest for detecting an Earth-like exoplanet. The atmospheric transmission spectrum of our Earth will be an ideal template for comparison with future exo-Earth candidates. By observing a lunar eclipse, which offers a similar configuration to that of an exoplanet transit, we have obtained a high-resolution and high signal-to-noise ratio (SNR) transmission spectrum of the Earth's atmosphere. This observation was performed with the High Resolution Spectrograph at Xinglong Station, China during the total lunar eclipse in December 2011. We compare the observed transmission spectrum with our atmospheric model, and determine the characteristics of the various atmospheric species in detail. In the transmission spectrum, O-2, O-3, O-2 O-2, NO2 and H2O are detected, and their column densities are measured and compared with the satellites data. The visible Chappuis band of ozone produces the most prominent absorption feature, which suggests that ozone is a promising molecule for the future exo-Earth characterization. Due to the high resolution and high SNR of our spectrum, several novel details of the Earth atmosphere's transmission spectrum are presented. The individual O-2 lines are resolved and O-2 isotopes are clearly detected. Our new observations do not confirm the absorption features of Ca II or Na I which have been reported in previous lunar eclipse observations. However, features in these and some other strong Fraunhofer line positions do occur in the observed spectrum. We propose that these are due to a Raman-scattered component in the forward-scattered sunlight appearing in the lunar umbral spectrum. Water vapour absorption is found to be rather weak in our spectrum because the atmosphere we probed is relatively dry, which prompts us to discuss the detectability of water vapour in Earth-like exoplanet atmospheres.
收录类别SCI
语种英语
WOS记录号WOS:000351349900010
源URL[http://ir.bao.ac.cn/handle/114a11/5737]  
专题国家天文台_光学天文研究部
作者单位1.Chinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, Beijing 100012, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.European So Observ, D-85748 Garching, Germany
4.Inst Astrofis Canarias, Tenerife 38205, Spain
5.Univ La Laguna, Dept Astrofis, E-38206 Tenerife, Spain
推荐引用方式
GB/T 7714		 Yan, F.,Fosbury, R. A. E.,Petr-Gotzens, M. G.,et al. High-resolution transmission spectrum of the Earth's atmosphere-seeing Earth as an exoplanet using a lunar eclipse[J]. INTERNATIONAL JOURNAL OF ASTROBIOLOGY,2015,14(2):255-266.
APA Yan, F..,Fosbury, R. A. E..,Petr-Gotzens, M. G..,Zhao, G..,Wang, W..,...&Palle, E..(2015).High-resolution transmission spectrum of the Earth's atmosphere-seeing Earth as an exoplanet using a lunar eclipse.INTERNATIONAL JOURNAL OF ASTROBIOLOGY,14(2),255-266.
MLA Yan, F.,et al."High-resolution transmission spectrum of the Earth's atmosphere-seeing Earth as an exoplanet using a lunar eclipse".INTERNATIONAL JOURNAL OF ASTROBIOLOGY 14.2(2015):255-266.

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来源：国家天文台

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