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Diurnal Variability and Detectability of Vegetation Red Edge of Earth-like Exoplanets
Wang, Fei1,2,3; He, Jinping1,2
2021-03-01
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume909Issue:1Pages:12
AbstractThe vegetation red edge (VRE) is a unique spectral fingerprint of light-harvesting vegetation on Earth and provides a robust remote detectable surface biosignature of exoplanets. To improve the detectability and sensitivity, we have studied the diurnal variability of VRE in the disk-integrated spectra of Earth and also Earth analogs in the case of different observing geometry conditions. Simulation results show that the VRE index varies from 0.6 at a diurnal timescale for both present and also Late Triassic Earth, and the maximum variation of VRE in 1 day changes by >3 times with different observing geometry conditions. This means that the extraterrestrial light-harvesting vegetation (even if it really exists) will not be efficiently detectable without proper observing geometry conditions and time, especially in the case of the exoplanets covered with thick clouds. The VRE temporal variation curve can also be used to retrieve the cloud cover fraction and continent distribution of exoplanets with relatively high precision. Several observational strategies are proposed to detect the light-harvesting vegetation and retrieve the planetary information from the planet's VRE variation signals, and a mock observation is also demonstrated.
KeywordAstrobiology Biosignatures Exoplanet surface variability Exoplanet surface characteristics Spectroscopy
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; CAS Pioneer Hundred Talents Program ; CAS Pioneer Hundred Talents Program ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; CAS Pioneer Hundred Talents Program ; CAS Pioneer Hundred Talents Program ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; CAS Pioneer Hundred Talents Program ; CAS Pioneer Hundred Talents Program ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; CAS Pioneer Hundred Talents Program ; CAS Pioneer Hundred Talents Program
DOI10.3847/1538-4357/abd6ff
Language英语
Funding ProjectNational Natural Science Foundation of China[11773045] ; National Natural Science Foundation of China[11973009] ; National Natural Science Foundation of China[11933005] ; CAS Pioneer Hundred Talents Program
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; CAS Pioneer Hundred Talents Program ; CAS Pioneer Hundred Talents Program ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; CAS Pioneer Hundred Talents Program ; CAS Pioneer Hundred Talents Program ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; CAS Pioneer Hundred Talents Program ; CAS Pioneer Hundred Talents Program ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; CAS Pioneer Hundred Talents Program ; CAS Pioneer Hundred Talents Program
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000623905100001
PublisherIOP PUBLISHING LTD
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Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/79430
Collection中国科学院国家天文台
Corresponding AuthorHe, Jinping
Affiliation1.Chinese Acad Sci, Nanjing Inst Astron Opt & Technol, Natl Astron Observ, Nanjing 210042, Peoples R China
2.Chinese Acad Sci, Nanjing Inst Astron Opt & Technol, CAS Key Lab Astron Opt & Technol, Nanjing 210042, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Wang, Fei,He, Jinping. Diurnal Variability and Detectability of Vegetation Red Edge of Earth-like Exoplanets[J]. ASTROPHYSICAL JOURNAL,2021,909(1):12.
APA Wang, Fei,&He, Jinping.(2021).Diurnal Variability and Detectability of Vegetation Red Edge of Earth-like Exoplanets.ASTROPHYSICAL JOURNAL,909(1),12.
MLA Wang, Fei,et al."Diurnal Variability and Detectability of Vegetation Red Edge of Earth-like Exoplanets".ASTROPHYSICAL JOURNAL 909.1(2021):12.
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