The centre-to-limb variations of solar Fraunhofer lines imprinted upon lunar eclipse spectra

	The centre-to-limb variations of solar Fraunhofer lines imprinted upon lunar eclipse spectra
	Yan, F.1,2,3 ; Fosbury, R. A. E.3; Petr-Gotzens, M. G.3; Zhao, G.1 ; Palle, E.4,5
刊名	ASTRONOMY & ASTROPHYSICS
	2015-02-01
卷号	574
关键词	planets and satellites: atmospheres Earth Moon eclipses stars: atmospheres
英文摘要	The atmospheres of exoplanets are commonly studied by observing the transit of the planet passing in front of its parent star. The obscuration of part of the stellar disk during a transit will reveal aspects of its surface structure resulting from general centre-to-limb variations (CLVs). These become apparent when forming the ratio between the stellar light in and out of transit. These phenomena can be seen particularly clearly during the progress of a penumbral lunar eclipse, where the Earth transits the solar disk and masks different regions of the solar disk as the eclipse progresses. When inferring the properties of the planetary atmosphere, it is essential that this effect originating at the star is properly accounted for. Using the data observed from the 2014-April-15 lunar eclipse with the ESPaDOnS spectrograph mounted on the Canada France Hawaii Telescope (CFHT), we have obtained for the first time a time sequence of the penumbral spectra. These penumbral spectra enable us to study the centre-to-limb variations of solar Fraunhofer lines when the Earth is transiting Sun. The NaI and Call absorption features reported from previous lunar eclipse observations are demonstrated to be CLV features, which dominate the corresponding line profiles and mask possible planetary signal. Detecting atmospheric species in exoplanets via transit spectroscopy must account for the CLV effect.
收录类别	SCI
语种	英语
WOS记录号	WOS:000349467000094
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/6638]
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. The centre-to-limb variations of solar Fraunhofer lines imprinted upon lunar eclipse spectra[J]. ASTRONOMY & ASTROPHYSICS,2015,574.
APA	Yan, F.,Fosbury, R. A. E.,Petr-Gotzens, M. G.,Zhao, G.,&Palle, E..(2015).The centre-to-limb variations of solar Fraunhofer lines imprinted upon lunar eclipse spectra.ASTRONOMY & ASTROPHYSICS,574.
MLA	Yan, F.,et al."The centre-to-limb variations of solar Fraunhofer lines imprinted upon lunar eclipse spectra".ASTRONOMY & ASTROPHYSICS 574(2015).