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Context. Following the first discovery of a planet orbiting a giant star in2002, we started the CORALIE radial-velocity search for companions aroundevolved stars (CASCADES). We present the observations of three stars conductedat the 1.2 m Leonard Euler Swiss telescope at La Silla Observatory, Chile,using the CORALIE spectrograph. Aims. We aim to detect planetary companions tointermediate-mass G- and K- type evolved stars and perform a statisticalanalysis of this population. We searched for new planetary systems around thestars HD22532 (TIC 200851704), HD64121 (TIC 264770836), and HD69123 (TIC146264536). Methods. We have followed a volume-limited sample of 641 red giantssince 2006 to obtain high-precision radial-velocity measurements. We used theData & Analysis Center for Exoplanets (DACE) platform to perform aradial-velocity analysis to search for periodic signals in the line profile andactivity indices, to distinguish between planetary-induced radial-velocityvariations and stellar photospheric jitter, and to search for significantsignals in the radial-velocity time series to fit a corresponding Keplerianmodel. Results. In this paper, we present the survey in detail, and we reporton the discovery of the first three planets of the sample around the giantstars HD22532, HD64121, and HD69123.

astronomy and astrophysics

CORALIE radial-velocity search for companions around evolved stars  (CASCADES). I. Sample definition and first results: Three new planets  orbiting giant stars