New light-travel time models and orbital stability study of the proposed planetary system HU Aquarii

Hinse, T. C., Lee, J. W., Goździewski, K., Haghighipour, N., Lee, Chee Yuen and Scullion, Eamon (2012) New light-travel time models and orbital stability study of the proposed planetary system HU Aquarii. Monthly Notices of the Royal Astronomical Society, 420 (4). pp. 3609-3620. ISSN 0035-8711

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In this work we propose a new orbital architecture for the two proposed circumbinary planets around the polar eclipsing binary HU Aquarii. We base the new two-planet, light-travel time model on the result of a Monte Carlo simulation driving a least-squares Levenberg-Marquardt minimization algorithm on the observed eclipse egress times. Our best-fitting model with resulted in high final eccentricities for the two companions leading to an unstable orbital configuration. From a large ensemble of initial guesses, we examined the distribution of final eccentricities and semimajor axes for different parameter intervals and encountered qualitatively a second population of best-fitting parameters. The main characteristic of this population is described by low-eccentric orbits favouring long-term orbital stability of the system. We present our best-fitting model candidate for the proposed two-planet system and demonstrate orbital stability over one million years using numerical integrations.

Item Type: Article
Uncontrolled Keywords: binaries: close, binaries: eclipsing, stars: individual: HU Aquarii
Subjects: F500 Astronomy
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User: Paul Burns
Date Deposited: 19 Dec 2018 16:58
Last Modified: 11 Oct 2019 15:01

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