Influence of stellar variability on the determination of the radius during a transit of an exoplanet

Influence of stellar variability on the determination of the radius during a transit of an exoplanet

Stellar variability can affect the estimate of an exoplanet radius measured during a transit. We developed a transit light curve model which includes stellar spots. It appears that, if spectro-photometric technique is used, spots and faculae have to be considered to conclude on atmospheric detection...

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Main Authors: Désert J.-M., Lecavelier des Etangs A., Parmentier V., Sing D.
Format: Article
Language:English
Published: EDP Sciences 2011-07-01
Series:EPJ Web of Conferences
Online Access:http://dx.doi.org/10.1051/epjconf/20111604002
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spelling doaj-904cd79ea150454287c8c154da4061722021-08-02T18:20:25ZengEDP SciencesEPJ Web of Conferences2100-014X2011-07-01160400210.1051/epjconf/20111604002Influence of stellar variability on the determination of the radius during a transit of an exoplanetDésert J.-M.Lecavelier des Etangs A.Parmentier V.Sing D.Stellar variability can affect the estimate of an exoplanet radius measured during a transit. We developed a transit light curve model which includes stellar spots. It appears that, if spectro-photometric technique is used, spots and faculae have to be considered to conclude on atmospheric detection and characterization. When using a model including spots, characterization of Hot-Jupiter atmosphere around active stars is possible with this technique, provided a signal to noise ratio up to 105. For Earth-size planets a long-term parallel photometric follow up monitoring the stellar activity is required to compensate the error due to the stellar variability. http://dx.doi.org/10.1051/epjconf/20111604002
collection DOAJ
language English
format Article
sources DOAJ
author Désert J.-M.
Lecavelier des Etangs A.
Parmentier V.
Sing D.
spellingShingle Désert J.-M.
Lecavelier des Etangs A.
Parmentier V.
Sing D.
Influence of stellar variability on the determination of the radius during a transit of an exoplanet
EPJ Web of Conferences
author_facet Désert J.-M.
Lecavelier des Etangs A.
Parmentier V.
Sing D.
author_sort Désert J.-M.
title Influence of stellar variability on the determination of the radius during a transit of an exoplanet
title_short Influence of stellar variability on the determination of the radius during a transit of an exoplanet
title_full Influence of stellar variability on the determination of the radius during a transit of an exoplanet
title_fullStr Influence of stellar variability on the determination of the radius during a transit of an exoplanet
title_full_unstemmed Influence of stellar variability on the determination of the radius during a transit of an exoplanet
title_sort influence of stellar variability on the determination of the radius during a transit of an exoplanet
publisher EDP Sciences
series EPJ Web of Conferences
issn 2100-014X
publishDate 2011-07-01
description Stellar variability can affect the estimate of an exoplanet radius measured during a transit. We developed a transit light curve model which includes stellar spots. It appears that, if spectro-photometric technique is used, spots and faculae have to be considered to conclude on atmospheric detection and characterization. When using a model including spots, characterization of Hot-Jupiter atmosphere around active stars is possible with this technique, provided a signal to noise ratio up to 105. For Earth-size planets a long-term parallel photometric follow up monitoring the stellar activity is required to compensate the error due to the stellar variability.
url http://dx.doi.org/10.1051/epjconf/20111604002
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AT lecavelierdesetangsa influenceofstellarvariabilityonthedeterminationoftheradiusduringatransitofanexoplanet
AT parmentierv influenceofstellarvariabilityonthedeterminationoftheradiusduringatransitofanexoplanet
AT singd influenceofstellarvariabilityonthedeterminationoftheradiusduringatransitofanexoplanet
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