The HD 181433 Planetary System: Dynamics and a New Orbital Solution

Horner, Jonathan and Wittenmyer, Robert A. and Wright, Duncan J. and Hinse, Tobias C. and Marshall, Jonathan P. and Kane, Stephen R. and Clark, Jake T. and Mengel, Matthew and Agnew, Matthew T. and Johns, Daniel (2019) The HD 181433 Planetary System: Dynamics and a New Orbital Solution. The Astronomical Journal, 158 (3). pp. 100-111. ISSN 0004-6256

[img]
Preview
Text (Published Version)
181433.pdf

Download (1MB) | Preview

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.


Statistics for USQ ePrint 37417
Statistics for this ePrint Item
Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: ©American Institute of Physics
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Astrophysics (1 Aug 2018 -)
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Astrophysics (1 Aug 2018 -)
Date Deposited: 24 Jan 2020 00:25
Last Modified: 30 Jan 2020 00:59
Uncontrolled Keywords: planetary systems; planets and satellites: general; stars:; individual: HD 181433; Astrophysics - Earth and Planetary Astrophysics
Fields of Research : 02 Physical Sciences > 0201 Astronomical and Space Sciences > 020110 Stellar Astronomy and Planetary Systems
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970102 Expanding Knowledge in the Physical Sciences
Identification Number or DOI: 10.3847/1538-3881/ab2e78
URI: http://eprints.usq.edu.au/id/eprint/37417

Actions (login required)

View Item Archive Repository Staff Only