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An international team led by Alexandre Santerne from Instituto de Astrofísica e Ciências do Espaço (IA), made a 5-year radial velocity campaign of Kepler's giant exoplanet candidates, using the SOPHIE4spectrograph (Observatory of Haute-Provence, France), and found that 52.3% were actually eclipsing binaries, while 2.3% were brown dwarfs.
Santerne (IA & University of Porto), first author of this paper commented: "It was thought that the reliability of the Kepler exoplanets detection was very good -- between 10 and 20% of them were not planets. Our extensive spectroscopic survey, of the largest exoplanets discovered by Kepler, shows that this percentage is much higher, even above 50%. This has strong implications in our understanding of the exoplanet population in the Kepler field."