Stability analysis of three exoplanet systems
Article
Article Title | Stability analysis of three exoplanet systems |
---|---|
ERA Journal ID | 1074 |
Article Category | Article |
Authors | Marshall, J. P. (Author), Horner, J. (Author), Wittenmyer, R. A. (Author), Clark, J. T. (Author) and Mengel, M. W. (Author) |
Journal Title | Monthly Notices of the Royal Astronomical Society |
Journal Citation | 494 (2), pp. 2280-2288 |
Number of Pages | 9 |
Year | 2020 |
Publisher | Oxford University Press |
Place of Publication | United Kingdom |
ISSN | 0035-8711 |
1365-2966 | |
Digital Object Identifier (DOI) | https://doi.org/10.1093/mnras/staa847 |
Web Address (URL) | https://academic.oup.com/mnras/article/494/2/2280/5819459 |
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. |
Keywords | planets and satellites; dynamical evolution and stability; stars; HD 67087; HD 110014; HD 133131A; planetary systems |
ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
Public Notes | This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2020 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. |
Byline Affiliations | Centre for Astrophysics |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q5x0x/stability-analysis-of-three-exoplanet-systems
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