2013/10/31 by Roman V. Baluev, C. Beaugé, Cristian Beaugé
Physics and Astronomy · #Astronomy #Astronomy and Astrophysical Research #Astrophysics #Astrophysics and Star Formation Studies #Celestial mechanics #Computer science #Exoplanet #Giant planet #Mean motion #Orbital elements #Physics #Planet #Planetary system #Radial velocity #Stars #Stellar, planetary, and galactic studies #Upgrade #Variation (astronomy) #astro-ph.EP
paper · pdf · doi:10.1093/mnras/stt2486
18 pages, 5 tables, 18 figures; accepted for publication in MNRAS
arxiv created 2014/01/13 · arxiv updated 2014/01/14 · openalex publication_date 2014/01/28 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We carry out a new analysis of the published radial velocity data for the planet-hosting star HD 82943. We include the recent Keck/HIRES measurements as well as the aged but much more numerous CORALIE data. We find that the CORALIE radial velocity measurements are polluted by a systematic annual variation which affected the robustness of many previous results. We show that after purging this variation, the residuals still contain a clear signature of an additional ∼1100 d periodicity. The latter variation leaves significant hints in all three independent radial velocity subsets that we analysed: the CORALIE data, the Keck data acquired prior to a hardware upgrade and the Keck data taken after the upgrade. We mainly treat this variation as a signature of a third planet in the system, although we cannot rule out other interpretations, such as long-term stellar activity. We find it easy to naturally obtain a stable three-planet radial velocity fit close to the three-planet mean-motion resonance 1:2:5, with the two main planets (those in the 1:2 resonance) in an aligned apsidal corotation. The dynamical status of the third planet is still uncertain: it may reside in as well as slightly out of the 5:2 resonance. We obtain the value of about 1075 d for its orbital period and ∼0.3MJup for its minimum mass, while the eccentric parameters are uncertain.