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Comparative blind test of five planetary transit detection algorithms on realistic synthetic light curves

Moutou, C. and Pont, F.(Observatoire de Genève, Sauverny, Switzerland), and Barge, P. and Aigrain, S. and Auvergne, M. and Blouin, D. and Cautain, R. and Erikson, A. and Guis, V. and Guterman, P.(Gemplus Card International, La Ciotat, France), and Irwin, M. and Lanza, A. F. and Queloz, D. and Rauer, H. and Voss, H. and Zucker, S. (2005) Comparative blind test of five planetary transit detection algorithms on realistic synthetic light curves. Astronomy and Astrophysics, 437, pp. 355-368.

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Abstract

Because photometric surveys of exoplanet transits are very promising sources of future discoveries, many algorithms are being developed to detect transit signals in stellar light curves. This paper compares such algorithms for the next generation of space-based transit detection surveys like CoRoT, Kepler, and Eddington. Five independent analyses of a thousand synthetic light curves are presented. The light curves were produced with an end-to-end instrument simulator and include stellar micro-variability and a varied sample of stellar and planetary transits diluted within a much larger set of light curves. The results show that different algorithms perform quite differently, with varying degrees of success in detecting real transits and avoiding false positives. We also find that the detection algorithm alone does not make all the difference, as the way the light curves are filtered and detrended beforehand also has a strong impact on the detection limit and on the false alarm rate. The microvariability of sun-like stars is a limiting factor only in extreme cases, when the fluctuation amplitudes are large and the star is faint. In the majority of cases it does not prevent detection of planetary transits. The most sensitive analysis is performed with periodic box-shaped detection filters. False positives are method-dependent, which should allow reduction of their detection rate in real surveys. Background eclipsing binaries are wrongly identified as planetary transits in most cases, a result which confirms that contamination by background stars is the main limiting factor. With parameters simulating the CoRoT mission, our detection test indicates that the smallest detectable planet radius is on the order of 2 Earth radii for a 10-day orbital period planet around a K0 dwarf.

Item URL in elib:https://elib.dlr.de/18923/
Document Type:Article
Additional Information: LIDO-Berichtsjahr=2005,
Title:Comparative blind test of five planetary transit detection algorithms on realistic synthetic light curves
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Moutou, C.LAM, Marseille, FranceUNSPECIFIED
Pont, F.(Observatoire de Genève, Sauverny, Switzerland), LAM, Marseille, FranceUNSPECIFIED
Barge, P.LAM, Marseille, FranceUNSPECIFIED
Aigrain, S.Institute of Astronomy, University of Cambridge, Cambridge, UKUNSPECIFIED
Auvergne, M.OPM, Meudon, FranceUNSPECIFIED
Blouin, D.LAM, Marseille, FranceUNSPECIFIED
Cautain, R.LAM, Marseille, FranceUNSPECIFIED
Erikson, A.UNSPECIFIEDUNSPECIFIED
Guis, V.LAM, Marseille, FranceUNSPECIFIED
Guterman, P.(Gemplus Card International, La Ciotat, France), LAM, Marseille, FranceUNSPECIFIED
Irwin, M.Institute of Astronomy, University of Cambridge, Cambridge, UKUNSPECIFIED
Lanza, A. F.INAF - Osservatorio Astrofisico di Catania, Catania, ItalyUNSPECIFIED
Queloz, D.Observatoire de Genève, Sauverny, SwitzerlandUNSPECIFIED
Rauer, H.UNSPECIFIEDUNSPECIFIED
Voss, H.UNSPECIFIEDUNSPECIFIED
Zucker, S.Observatoire de Genève, Sauverny, SwitzerlandUNSPECIFIED
Date:2005
Journal or Publication Title:Astronomy and Astrophysics
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:Yes
Volume:437
Page Range:pp. 355-368
Status:Published
Keywords:planetary systems -- methods: data analysis -- techniques: photometric -- methods: observational
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EW - Erforschung des Weltraums
DLR - Research area:Space
DLR - Program:W EW - Erforschung des Weltraums
DLR - Research theme (Project):UNSPECIFIED
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research
Deposited By: Pieth, Susanne
Deposited On:13 Dec 2005
Last Modified:14 Jan 2010 12:48

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