Journal Article

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

T. C. Hinse, J. W. Lee, K. Goździewski, N. Haghighipour, C.-U. Lee and E. M. Scullion

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 420, issue 4, pages 3609-3620
Published in print March 2012 | ISSN: 0035-8711
Published online March 2012 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2011.20283.x
New light-travel time models and orbital stability study of the proposed planetary system HU Aquarii

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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.

Keywords: binaries: close; binaries: eclipsing; stars: individual: HU Aquarii

Journal Article.  6991 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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