CORALIE radial-velocity search for companions around evolved stars (CASCADES)

Context . With around 200 detections of exoplanets around giant stars to date, our knowledge of the population of exoplanets orbiting evolved hosts more massive than the Sun remains limited. The CORALIE radial-velocity search for companions around evolved stars (CASCADES) was launched in 2006 with the aim of improving our understanding of the demographics of exoplanets around intermediate-mass stars, by studying them once they have evolved off the main sequence. Aims . We intend to refine the current sample of known exoplanets orbiting intermediate-mass (1.5–5 M ⊙ ) giant stars of spectral types G and early K. We searched for exoplanets orbiting the four stars HD 87816, HD 94890, HD 102888, and HD 121056. Methods . We used data obtained with the CORALIE spectrograph, mounted on the Leonhard Euler Swiss telescope located at La Silla Observatory in Chile. We gathered high-precision radial-velocity measurements over more than ten years for each of the aforementioned targets. We started by performing a search for periodic signals in the radial-velocity time series of the four targets by using periodograms. Following this, we fit for a Keplerian model using the significant peak with the highest power of the periodogram as the starting guess for the period. We then subtracted this model and repeated the procedure iteratively on the residuals until no significant peaks were found. Finally, to explore the posterior distribution of our models, the final solution was determined using a Markov chain Monte Carlo approach. Results . We report the discovery of five new massive planets around HD 87816, HD 94890, and HD 102888 as well as the presence of a distant, potentially substellar, companion around HD 102888. We confirm the presence of a previously announced exoplanet orbiting the HD 121056 multi-object system with a period of 89 days and propose an update to the period of the outer companion.

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Publication Details

Journal
Astronomy and Astrophysics
Published
2025-07-01
DOI
https://doi.org/10.1051/0004-6361/202554137
Citations
1
Primary Topic
Stellar, planetary, and galactic studies
Type
article
Field-Weighted Citation Impact
1.15

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article

CORALIE radial-velocity search for companions around evolved stars (CASCADES)

M. Mayor, P. Figueira, B. Akinsanmi, D. Ségransan et al.
1 citations
Astronomy and Astrophysics
Stellar, planetary, and galactic studies
1.15
article

CORALIE radial-velocity search for companions around evolved stars (CASCADES)

M. Mayor, P. Figueira, B. Akinsanmi, D. Ségransan, B. Lavie, E. Fontanet, D. J. M. Petit dit de la Roche, Casper Farret Jentink, J.A. Acevedo Barroso, Siddharth Bhatnagar, F. Pepe, Maddalena Bugatti, C. Lovis, Yann Carteret, N. C. Santos, O. Attia, Manohar Shinde, Matthew P. Battley, N. Unger, A. Deline, S. Udry, Yolanda G. C. Frensch, Giordano Viviani, A. Nigioni, H. Chakraborty, Mathilde Houelle, G. Ottoni, S. Tavella
article en
1 citations

Abstract

Context . With around 200 detections of exoplanets around giant stars to date, our knowledge of the population of exoplanets orbiting evolved hosts more massive than the Sun remains limited. The CORALIE radial-velocity search for companions around evolved stars (CASCADES) was launched in 2006 with the aim of improving our understanding of the demographics of exoplanets around intermediate-mass stars, by studying them once they have evolved off the main sequence. Aims . We intend to refine the current sample of known exoplanets orbiting intermediate-mass (1.5–5 M ⊙ ) giant stars of spectral types G and early K. We searched for exoplanets orbiting the four stars HD 87816, HD 94890, HD 102888, and HD 121056. Methods . We used data obtained with the CORALIE spectrograph, mounted on the Leonhard Euler Swiss telescope located at La Silla Observatory in Chile. We gathered high-precision radial-velocity measurements over more than ten years for each of the aforementioned targets. We started by performing a search for periodic signals in the radial-velocity time series of the four targets by using periodograms. Following this, we fit for a Keplerian model using the significant peak with the highest power of the periodogram as the starting guess for the period. We then subtracted this model and repeated the procedure iteratively on the residuals until no significant peaks were found. Finally, to explore the posterior distribution of our models, the final solution was determined using a Markov chain Monte Carlo approach. Results . We report the discovery of five new massive planets around HD 87816, HD 94890, and HD 102888 as well as the presence of a distant, potentially substellar, companion around HD 102888. We confirm the presence of a previously announced exoplanet orbiting the HD 121056 multi-object system with a period of 89 days and propose an update to the period of the outer companion.

Astronomy and AstrophysicsVol. 699
University of Geneva (CH), Queen Mary University of London (GB), Universidade do Porto (PT), HES-SO Genève (CH), Institute of Astrophysics and Space Sciences (PT), École Polytechnique Fédérale de Lausanne (CH)
National Science Foundation, European Commission, Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung, Université de Genève, Fundação para a Ciência e a Tecnologia
Openalex Percentile: Top 18%
Stellar, planetary, and galactic studies
1.15
DOIOpen Access PDFOpenAlex
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