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, E. M. Scullion

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

42 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)3609-3620
Number of pages12
JournalMonthly Notices of the Royal Astronomical Society
Volume420
Issue number4
DOIs
Publication statusPublished - 1 Mar 2012

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