The HD 181433 Planetary System: Dynamics and a New Orbital Solution
Article
Article Title | The HD 181433 Planetary System: Dynamics and a New Orbital Solution |
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ERA Journal ID | 1048 |
Article Category | Article |
Authors | Horner, Jonathan (Author), Wittenmyer, Robert A. (Author), Wright, Duncan J. (Author), Hinse, Tobias C. (Author), Marshall, Jonathan P. (Author), Kane, Stephen R. (Author), Clark, Jake T. (Author), Mengel, Matthew (Author), Agnew, Matthew T. (Author) and Johns, Daniel (Author) |
Journal Title | The Astronomical Journal |
Journal Citation | 158 (3), pp. 100-111 |
Article Number | 100 |
Number of Pages | 12 |
Year | 2019 |
Publisher | IOP Publishing |
Place of Publication | United States |
ISSN | 0004-6256 |
1538-3881 | |
Digital Object Identifier (DOI) | https://doi.org/10.3847/1538-3881/ab2e78 |
Web Address (URL) | https://iopscience.iop.org/article/10.3847/1538-3881/ab2e78 |
Abstract | We present a detailed analysis of the orbital stability of the HD 181433 planetary system, finding it to exhibit strong dynamical instability across a wide range of orbital eccentricities, semimajor axes, and mutual inclinations. We also analyze the behavior of an alternative system architecture, proposed by Campanella, and find that it offers greater stability than the original solution, as a result of the planets being trapped in strong mutual resonance. We take advantage of more recent observations to perform a full refit of the system, producing a new planetary solution. The best-fit orbit for HD 181433 d now places the planet at a semimajor axis of 6.60 ± 0.22 au, with an eccentricity of 0.469 ± 0.013. Extensive simulations of this new system architecture reveal it to be dynamically stable across a broad range of potential orbital parameter space, increasing our confidence that the new solution represents the ground truth of the system. Our work highlights the advantage of performing dynamical simulations of candidate planetary systems in concert with the orbital fitting process, as well as supporting the continuing monitoring of radial velocity planet search targets. |
Keywords | planetary systems; planets and satellites: general; stars:; individual: HD 181433; Astrophysics - Earth and Planetary Astrophysics |
Contains Sensitive Content | Does not contain sensitive content |
ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
Public Notes | For access to this article, please click on the URL link provided. |
Byline Affiliations | Centre for Astrophysics |
Chungnam National University, Korea | |
University of California, United States | |
Swinburne University of Technology | |
Kutztown University, United States | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q5754/the-hd-181433-planetary-system-dynamics-and-a-new-orbital-solution
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