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Flux and polarization signals of Earth-like exoplanets covered by sub-solar clouds
Wang S(王爽)1,2,3; Qu ZQ(屈中权)1,2,3
Source PublicationASTROPHYSICS AND SPACE SCIENCE
2019-06-01
Volume364Issue:6Pages:8
DOI10.1007/s10509-019-3588-y
Contribution Rank第1完成单位
Indexed BySCI
KeywordPolarimetry Earth-like exoplanets
Abstract

We investigate the flux and polarization signals of Earth-like exoplanets covered by sub-solar clouds. These clouds occur at the region where solar zenith angle is smaller than a specific angle sigma. We calculate the flux and polarization of the light reflected by the planetary disk, and we include multiple scattering. For a given sigma, the sub-solar cloud coverage will change with the phase angle, corresponding to the various viewing geometries. We study the influences of cloud optical thicknesses, surface albedos, cloud particle sizes and wavelengths. Then we investigate how these parameters together with the variation of cloud coverage caused by viewing geometries leave traces on flux and polarization signals. The larger values of sigma corresponding to larger cloud coverage before the cloud totally disappears, which increases flux and reduces polarization. For a given value of sigma, while considering the influences of parameters such as cloud optical thickness, surface albedo, cloud particle size and wavelength, the cloud coverage variation also should be taken into account. The location of a rainbow is not affected by sigma, cloud optical thickness and surface albedo. However, both the larger values of sub-solar cloud optical thicknesses and the larger surface albedos would reduce the polarization of the rainbow peaks. The location of a rainbow may be affected by cloud particle effective radius (reff) and wavelength. As reff and/or wavelength increases, the polarization signal shows a stronger primary rainbow feature. The location of the maximum polarization can be affected by sigma, cloud optical thickness, surface albedo and wavelength. But the reff seems not to affect the location of maximum polarization. The longer wavelength (such as 865nm) is suitable to derive sub-solar cloud coverage, and the rainbow feature can help to characterize cloud particles. All these results emphasize the importance of polarimetry for the characterization of exoplanets.

Funding ProjectNational Science Foundation of China (NSFC)[11078005] ; National Science Foundation of China (NSFC)[11527804] ; National Science Foundation of China (NSFC)[11373065] ; National Science Foundation of China (NSFC)[10943002] ; National Science Foundation of China (NSFC)[11373023]
Funding OrganizationNational Science Foundation of China (NSFC)[11078005, 11527804, 11373065, 10943002, 11373023]
Language英语
Subject Area天文学 ; 太阳与太阳系
MOST Discipline Catalogue理学 ; 理学::天文学
SubtypeArticle
PublisherSPRINGER
Publication PlaceVAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS
ISSN0004-640X
URL查看原文
WOS IDWOS:000472016100001
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordPOLARIMETRY ; JUPITER
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/20378
Collection光纤阵列太阳光学望远镜研究组
Corresponding AuthorWang S(王爽)
Affiliation1.Yunnan Observatories, Chinese Academy of Sciences, Kunming, China
2.University of Chinese Academy of Sciences, Beijing, China
3.Center for Astronomical Mega-Science, CAS, Beijing, China
First Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Corresponding Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Wang S,Qu ZQ. Flux and polarization signals of Earth-like exoplanets covered by sub-solar clouds[J]. ASTROPHYSICS AND SPACE SCIENCE,2019,364(6):8.
APA Wang S,&Qu ZQ.(2019).Flux and polarization signals of Earth-like exoplanets covered by sub-solar clouds.ASTROPHYSICS AND SPACE SCIENCE,364(6),8.
MLA Wang S,et al."Flux and polarization signals of Earth-like exoplanets covered by sub-solar clouds".ASTROPHYSICS AND SPACE SCIENCE 364.6(2019):8.
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