Architecture of planetary systems with and without outer giant planets

Understanding the link between outer giant planets (OGPs) and inner light planets (ILPs) is key to understanding planetary system formation and architecture. The correlation between these two populations of planets is debated both theoretically – different formation models predict either a correlation or an anticorrelation – and observationally. Several recent attempts to constrain this correlation have yielded contradictory results, due to small-number statistics and heterogeneous samples. We present an ongoing long-term observational effort with CORALIE, HARPS, and ESPRESSO to probe the ILP occurrence in systems with and without OGP. In this first article of a series, we discuss how, from the design to the observations, we ensured the homogeneity of the samples, both in terms of stellar properties and observing strategy. We also present the first three detections of ILPs in our OGP host sample. We find a 8.3 m ⊕ planet at 5.75 d around HD 23079, a 10.4 m ⊕ planet at 4.6 d around HD 196067, and we confirm the 7.5 m ⊕ planet at 3.98 d around HD 86226. While a rigorous statistical analysis of our samples will be performed in subsequent studies, the relatively low number of detections in our sample seems to contradict previous studies that found a strong OGP-ILP correlation.

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Publication Details

Journal
Astronomy and Astrophysics
Published
2025-09-30
DOI
https://doi.org/10.1051/0004-6361/202555445
Primary Topic
Stellar, planetary, and galactic studies
Type
article
Field-Weighted Citation Impact
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article

Architecture of planetary systems with and without outer giant planets

N. Unger, R. F. Díaz, D. Barbato, S. Udry et al.
Astronomy and Astrophysics
Stellar, planetary, and galactic studies
article

Architecture of planetary systems with and without outer giant planets

N. Unger, R. F. Díaz, D. Barbato, S. Udry, W. Ceva, D. Ségransan, E. Fontanet, C. Lovis, J. P. Faria, N.C. Santos, F. Bouchy, G. Laughlin, C. Mordasini, M. Marmier, M. Mayor, N.C. Hara, A. Leleu, M. Cretignier, X. Dumusque, Fabrizio Pepe, G. Lo Curto, Yolanda G. C. Frensch, S. G. Sousa, L. Mignon, J.-B. Delisle
article en

Abstract

Understanding the link between outer giant planets (OGPs) and inner light planets (ILPs) is key to understanding planetary system formation and architecture. The correlation between these two populations of planets is debated both theoretically – different formation models predict either a correlation or an anticorrelation – and observationally. Several recent attempts to constrain this correlation have yielded contradictory results, due to small-number statistics and heterogeneous samples. We present an ongoing long-term observational effort with CORALIE, HARPS, and ESPRESSO to probe the ILP occurrence in systems with and without OGP. In this first article of a series, we discuss how, from the design to the observations, we ensured the homogeneity of the samples, both in terms of stellar properties and observing strategy. We also present the first three detections of ILPs in our OGP host sample. We find a 8.3 m ⊕ planet at 5.75 d around HD 23079, a 10.4 m ⊕ planet at 4.6 d around HD 196067, and we confirm the 7.5 m ⊕ planet at 3.98 d around HD 86226. While a rigorous statistical analysis of our samples will be performed in subsequent studies, the relatively low number of detections in our sample seems to contradict previous studies that found a strong OGP-ILP correlation.

Astronomy and AstrophysicsVol. 703
University of Geneva (CH), Centre National de la Recherche Scientifique (FR), Planetary Science Institute (US), Universidade do Porto (PT), Aix-Marseille Université (FR), Yale University (US), University of Oxford (GB), Institute of Astrophysics and Space Sciences (PT), Instituto Tecnológico de Buenos Aires (ITBA) (AR), International Center for Advanced Studies (AR), Osservatorio Astronomico di Padova (IT), Lunar and Planetary Institute (US), Université Grenoble Alpes (FR)
Openalex Percentile: Top 81%
Stellar, planetary, and galactic studies
DOIOpen Access PDFOpenAlex
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