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dc.contributor.author
Dumusque, X.  
dc.contributor.author
Borsa, F.  
dc.contributor.author
Damasso, M.  
dc.contributor.author
Diaz, Rodrigo Fernando  
dc.contributor.author
Gregory, P. C.  
dc.contributor.author
Hara, N. C.  
dc.contributor.author
Hatzes, A.  
dc.contributor.author
Rajpaul, V.  
dc.contributor.author
Tuomi, M.  
dc.contributor.author
Aigrain, S.  
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Anglada Escudé, G.  
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Bonomo, A. S.  
dc.contributor.author
Boué, G.  
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Dauvergne, F.  
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Frustagli, G.  
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Giacobbe, P.  
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Haywood, R. D.  
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Jones, H. R. A.  
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Laskar, J.  
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Pinamonti, M.  
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Poretti, E.  
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Rainer, M.  
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Ségransan, D.  
dc.contributor.author
Sozzetti, A.  
dc.contributor.author
Udry, S.  
dc.date.available
2017-06-19T18:19:05Z  
dc.date.issued
2017-02  
dc.identifier.citation
Dumusque, X.; Borsa, F.; Damasso, M.; Diaz, Rodrigo Fernando; Gregory, P. C.; et al.; Radial-velocity fitting challenge. II. First results of the analysis of the data set; Edp Sciences; Astronomy And Astrophysics; 598; A133; 2-2017; 1-35  
dc.identifier.issn
0004-6361  
dc.identifier.uri
http://hdl.handle.net/11336/18442  
dc.description.abstract
Context. Radial-velocity (RV) signals arising from stellar photospheric phenomena are the main limitation for precise RV measurements. Those signals induce RV variations an order of magnitude larger than the signal created by the orbit of Earth-twins, thus preventing their detection. Aims. Different methods have been developed to mitigate the impact of stellar RV signals. The goal of this paper is to compare the efficiency of these different methods to recover extremely low-mass planets despite stellar RV signals. However, because observed RV variations at the meter-per-second precision level or below is a combination of signals induced by unresolved orbiting planets, by the star, and by the instrument, performing such a comparison using real data is extremely challenging. Methods. To circumvent this problem, we generated simulated RV measurements including realistic stellar and planetary signals. Different teams analyzed blindly those simulated RV measurements, using their own method to recover planetary signals despite stellar RV signals. By comparing the results obtained by the different teams with the planetary and stellar parameters used to generate the simulated RVs, it is therefore possible to compare the efficiency of these different methods. Results. The most efficient methods to recover planetary signals take into account the different activity indicators, use red-noise models to account for stellar RV signals and a Bayesian framework to provide model comparison in a robust statistical approach. Using the most efficient methodology, planets can be found down to with a threshold of K/N = 7.5 at the level of 80–90% recovery rate found for a number of methods. These recovery rates drop dramatically for K/N smaller than this threshold. In addition, for the best teams, no false positives with K/N > 7.5 were detected, while a non-negligible fraction of them appear for smaller K/N. A limit of K/N = 7.5 seems therefore a safe threshold to attest the veracity of planetary signals for RV measurements with similar properties to those of the different RV fitting challenge systems.  
dc.format
application/pdf  
dc.language.iso
eng  
dc.publisher
Edp Sciences  
dc.rights
info:eu-repo/semantics/openAccess  
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/  
dc.subject
Techniques: Radial Velocities  
dc.subject
Planetary Systems  
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Stars: Oscillations  
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Stars: Activity  
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Methods: Data Analysis  
dc.subject.classification
Astronomía  
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Ciencias Físicas  
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CIENCIAS NATURALES Y EXACTAS  
dc.title
Radial-velocity fitting challenge. II. First results of the analysis of the data set  
dc.type
info:eu-repo/semantics/article  
dc.type
info:ar-repo/semantics/artículo  
dc.type
info:eu-repo/semantics/publishedVersion  
dc.date.updated
2017-06-13T14:15:09Z  
dc.journal.volume
598  
dc.journal.number
A133  
dc.journal.pagination
1-35  
dc.journal.pais
Francia  
dc.journal.ciudad
Paris  
dc.description.fil
Fil: Dumusque, X.. Université de Genève; Suiza  
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Fil: Borsa, F.. Osservatorio Astronomico di Brera; Italia  
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Fil: Damasso, M.. Osservatorio Astrofisico di Torino; Italia  
dc.description.fil
Fil: Diaz, Rodrigo Fernando. Consejo Nacional de Investigaciónes Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; Argentina. Université de Genève; Suiza  
dc.description.fil
Fil: Gregory, P. C.. University Of British Columbia; Canadá  
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Fil: Hara, N. C.. Centre National de la Recherche Scientifique. Observatoire de Paris; Francia  
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Fil: Hatzes, A.. Thüringer Landessternwarte Tautenburg; Alemania  
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Fil: Rajpaul, V.. University of Oxford; Reino Unido  
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Fil: Tuomi, M.. University Of Hertfordshire; Reino Unido  
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Fil: Aigrain, S.. University of Oxford; Reino Unido  
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Fil: Anglada Escudé, G.. Queen Mary University of London; Reino Unido  
dc.description.fil
Fil: Bonomo, A. S.. Osservatorio Astrofisico di Torino; Italia  
dc.description.fil
Fil: Boué, G.. Centre National de la Recherche Scientifique. Observatoire de Paris; Francia  
dc.description.fil
Fil: Dauvergne, F.. Centre National de la Recherche Scientifique. Observatoire de Paris; Francia  
dc.description.fil
Fil: Frustagli, G.. Osservatorio Astronomico di Brera; Italia  
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Fil: Giacobbe, P.. Osservatorio Astrofisico di Torino; Italia  
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Fil: Haywood, R. D.. Harvard-Smithsonian Center for Astrophysics; Estados Unidos  
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Fil: Jones, H. R. A.. University of Hertfordshire,; Reino Unido  
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Fil: Laskar, J.. Centre National de la Recherche Scientifique. Observatoire de Paris; Francia  
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Fil: Pinamonti, M.. Osservatorio Astronomico di Trieste; Italia  
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Fil: Poretti, E.. Osservatorio Astronomico di Brera; Italia  
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Fil: Rainer, M.. Osservatorio Astronomico di Brera; Italia  
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Fil: Ségransan, D.. Observatoire de Genève; Suiza  
dc.description.fil
Fil: Sozzetti, A.. Osservatorio Astrofisico di Torino; Italia  
dc.description.fil
Fil: Udry, S.. Observatoire de Genève; Suiza  
dc.journal.title
Astronomy And Astrophysics  
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1051/0004-6361/201628671  
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info:eu-repo/semantics/altIdentifier/url/https://arxiv.org/abs/1609.03674  
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://www.aanda.org/articles/aa/abs/2017/02/aa28671-16/aa28671-16.html