1. Αποθετήριο Παραδοτέων Υποτρόφων Δράσεων ΕΣΠΑ Τριτοβάθμιας Εκπαίδευσης 2017-2023
2. Όλο το Αποθετήριο
3. Μεταδιδακτορικοί ερευνητές

Τύπος:	Άρθρο σε επιστημονικό περιοδικό
Τίτλος:	Periodic orbits in the 1:2:3 resonant chain and their impact on the orbital dynamics of the Kepler-51 planetary system
Συγγραφέας:	[EL] Αντωνιάδου, Κυριακή[EN] Antoniadou, Kyriaki [EL] Βογιατζής, Γεώργιος[EN] Voyatzis, Georgios
Ημερομηνία:	19/05/2022
Περίληψη:	Aims. Space missions have discovered a large number of exoplanets evolving in (or close to) mean-motion resonances (MMRs) and resonant chains. Often, the published data exhibit very high uncertainties due to the observational limitations that introduce chaos into the evolution of the system on especially shorter or longer timescales. We propose a study of the dynamics of such systems by exploring particular regions in phase space. Methods. We exemplify our method by studying the long-term orbital stability of the three-planet system Kepler-51 and either favor or constrain its data. It is a dual process which breaks down in two steps: the computation of the families of periodic orbits in the 1:2:3 resonant chain and the visualization of the phase space through maps of dynamical stability. Results. We present novel results for the general four-body problem. Stable periodic orbits were found only in the low-eccentricity regime. We demonstrate three possible scenarios safeguarding Kepler-51, each followed by constraints. Firstly, there are the 2/1 and 3/2 two-body MMRs, in which eb < 0.02, such that these two-body MMRs last for extended time spans. Secondly, there is the 1:2:3 three-body Laplace-like resonance, in which ec < 0.016 and ed < 0.006 are necessary for such a chain to be viable. Thirdly, there is the combination comprising the 1/1 secondary resonance inside the 2/1 MMR for the inner pair of planets and an apsidal difference oscillation for the outer pair of planets in which the observational eccentricities, eb and ec, are favored as long as ed ≈ 0. Conclusions. With the aim to obtain an optimum deduction of the orbital elements, this study showcases the need for dynamical analyses based on periodic orbits performed in parallel to the fitting processes.
Γλώσσα:	Αγγλικά
Σελίδες:	16
DOI:	10.1051/0004-6361/202142953
EISSN:	1432-0746
Θεματική κατηγορία:	[EL] Αστρονομία και Αστροφυσική[EN] Astronomy and Astrophysics
Λέξεις-κλειδιά:	celestial mechanics; planets and satellites: dynamical evolution and stability; planetary systems; methods: analytical; methods: numerical; Chaos
Κάτοχος πνευματικών δικαιωμάτων:	© The European Southern Observatory (ESO) 2022
Όροι και προϋποθέσεις δικαιωμάτων:	To protect the copyright in the article, the following notice should be included in the credit: « Credit: Author, A&A, vol., page, year, reproduced with permission, (c) ESO ».
Διατίθεται ανοιχτά στην τοποθεσία:	https://arxiv.org/abs/2203.03349
Ηλεκτρονική διεύθυνση του τεκμηρίου στον εκδότη:	https://www.aanda.org/articles/aa/full_html/2022/05/aa42953-21/aa42953-21.html
Ηλεκτρονική διεύθυνση περιοδικού:	https://www.aanda.org/
Τίτλος πηγής δημοσίευσης:	Astronomy & Astrophysics (A&A)
Τόμος:	661
Σελίδες τεκμηρίου (στην πηγή):	Article no A62
Σημειώσεις:	The research of KIA is co-financed by Greece and the European Union (European Social Fund -ESF) through the Operational Programme "Human Resources Development, Education and Lifelong Learning” in the context of the project “Reinforcement of Postdoctoral Researchers - 2nd Cycle” (MIS-5033021), implemented by the State Scholarships Foundation (IKY).
Εμφανίζεται στις συλλογές:	Μεταδιδακτορικοί ερευνητές