Stability analysis of three exoplanet systems

Author:

Marshall J P12ORCID,Horner J2,Wittenmyer R A2,Clark J T2,Mengel M W2ORCID

Affiliation:

1. Academia Sinica Institute of Astronomy and Astrophysics, 11F Astronomy-Mathematics Building, NTU/AS Campus, No. 1, Section 4, Roosevelt Road, Taipei 10617, Taiwan

2. Centre for Astrophysics, University of Southern Queensland, Toowoomba, QLD 4350, Australia

Abstract

ABSTRACT The orbital solutions of published multiplanet systems are not necessarily dynamically stable on time-scales comparable to the lifetime of the system as a whole. For this reason, dynamical tests of the architectures of proposed exoplanetary systems are a critical tool to probe the stability and feasibility of the candidate planetary systems, with the potential to point the way towards refined orbital parameters of those planets. Such studies can even help in the identification of additional companions in such systems. Here, we examine the dynamical stability of three planetary systems, orbiting HD 67087, HD 110014, and HD 133131A. We use the published radial velocity measurements of the target stars to determine the best-fitting orbital solutions for these planetary systems using the systemic console. We then employ the N-body integrator mercury to test the stability of a range of orbital solutions lying within 3σ of the nominal best fit for a duration of 100 Myr. From the results of the N-body integrations, we infer the best-fitting orbital parameters using the Bayesian package astroemperor. We find that both HD 110014 and HD 133131A have long-term stable architectures that lie within the 1σ uncertainties of the nominal best fit to their previously determined orbital solutions. However, the HD 67087 system exhibits a strong tendency towards instability on short time-scales. We compare these results to the predictions made from consideration of the angular momentum deficit criterion, and find that its predictions are consistent with our findings.

Funder

Ministry of Science and Technology, Taiwan

Academia Sinica

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

Cited by 3 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. System Architecture and Planetary Obliquity: Implications for Long-term Habitability;The Astronomical Journal;2022-09-08

2. Classification of orbits in three-dimensional exoplanetary systems;Astronomy & Astrophysics;2021-01

3. Solar System Physics for Exoplanet Research;Publications of the Astronomical Society of the Pacific;2020-09-03

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