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

G. Ottoni, S. Udry, D. Ségransan, G. Buldgen, C. Lovis, P. Eggenberger, C. Pezzotti, V. Zh. Adibekyan, M. Marmier, M. Mayor, N. C. Santos, S. G. Sousa, N. Lagarde, C. Charbonnel

Context. Following the first discovery of a planet orbiting a giant star in 2002, we started the CORALIE radial-velocity search for companions around evolved stars. We present the observations of three stars conducted at the 1.2 m Leonard Euler Swiss telescope at La Silla Observatory, Chile, using the CORALIE spectrograph.
Aims. We aim to detect planetary companions to intermediate-mass G- and K- type evolved stars and perform a statistical analysis of this population. We searched for new planetary systems around the stars HD 22532 (TIC 200851704), HD 64121 (TIC 264770836), and HD 69123 (TIC 146264536).
Methods. We have followed a volume-limited sample of 641 red giants since 2006 to obtain high-precision radial-velocity measurements. We used the Data & Analysis Center for Exoplanets platform to perform a radial-velocity analysis to search for periodic signals in the line profile and activity indices, to distinguish between planetary-induced radial-velocity variations and stellar photospheric jitter, and to search for significant signals in the radial-velocity time series to fit a corresponding Keplerian model.
Results. In this paper, we present the survey in detail, and we report on the discovery of the first three planets of the sample around the giant stars HD 22532, HD 64121, and HD 69123.

techniques: radial velocities / planets and satellites: detection / planetary systems

★ Full Table 2 is only available at the CDS via anonymous ftp to ( or via ★★ Based on observations collected with the CORALIE echelle spectrograph on the 1.2-m Euler Swiss telescope at La Silla Observatory, ESO, Chile.

Astronomy & Astrophysics
Volume 657, Article Number A87, Number of pages 20
2022 January

>> ADS>> DOI

Faculdade de Ciências da Universidade de Lisboa Universidade do Porto Faculdade de Ciências e Tecnologia da Universidade de Coimbra
Fundação para a Ciência e a Tecnologia COMPETE 2020 PORTUGAL 2020 União Europeia