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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents



ID: 742360.0, MPI für Astronomie / Publikationen_mpia
Effect of the stellar absorption line centre-to-limb variation on exoplanet transmission spectrum observations
Authors:Yan, F.; Pallé, E.; Fosbury, R. A. E.; Petr-Gotzens, M. G.; Henning, T.
Date of Publication (YYYY-MM-DD):2017
Title of Journal:Astronomy and Astrophysics
Volume:603
Start Page:id. A73 (10 pp)
Audience:Not Specified
Abstract / Description:Transit spectroscopy is one of the most commonly used techniques for exoplanet atmosphere characterisation. This technique has been used to detect ionised and neutral species in exoplanet atmospheres by comparing the observed stellar lines in and out of transit. The centre-to-limb variation (CLV) of the stellar lines across the stellar disk is an important effect for transmission spectroscopy, since it results in a change of stellar line depth when the planet transits different parts of the stellar disk. We reanalysed the transit data of HD 189733b taken with the HARPS spectrograph to study the CLV effect during transit. The transmission light curve of the Na i D line so obtained shows a clear imprint of the CLV effect. We used a one-dimensional non-LTE stellar spectral model to simulate the CLV effect. After applying the correction, the measurement of the Na i absorption in the atmosphere of
Free Keywords:planets and satellites: atmospheres; techniques: spectroscopic; stars: atmospheres
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:ISSN:0004-6361
URL:http://adsabs.harvard.edu/abs/2017A%26A...603A..73...
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