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• W2022039054 abstract "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." @default.
• W2022039054 created "2016-06-24" @default.
• W2022039054 creator A5025773845 @default.
• W2022039054 creator A5087696741 @default.
• W2022039054 date "2014-01-28" @default.
• W2022039054 modified "2023-10-01" @default.
• W2022039054 title "Possible solution to the riddle of HD 82943 multiplanet system: the three-planet resonance 1:2:5?" @default.
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• W2022039054 doi "https://doi.org/10.1093/mnras/stt2486" @default.
• W2022039054 hasPublicationYear "2014" @default.
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