A dynamical investigation of the proposed BD +20 2457 system

Horner, J. and Wittenmyer, R. A. and Hinse, T. C. and Marshall, J. P. (2014) A dynamical investigation of the proposed BD +20 2457 system. Monthly Notices of the Royal Astronomical Society, 439 (1). pp. 1176-1181. ISSN 0035-8711

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We present a detailed dynamical analysis of the orbital stability of the BD +20 2457 system, which features planets or brown dwarfs moving on relatively eccentric orbits. We find that the system exhibits strong dynamical instability on astronomically short time-scales across a wide range of plausible orbital eccentricities, semi-major axes and inclinations. If the system truly hosts massive planets or brown dwarfs, our results suggest that they must move on orbits significantly different to those proposed in the discovery work. If that is indeed the case, then it is likely that the best-fitting orbital solutions for the proposed companions will change markedly as future observations are made. Such observations may result in the solution shifting to a more dynamically stable regime, potentially one where stability is ensured by mutually
resonant motion.

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: © 2014 The Authors. This publication is copyright. It may be reproduced in whole or in part for the purposes of study, research, or review, but is subject to the inclusion of an acknowledgment of the source.
Faculty / Department / School: Current - Faculty of Health, Engineering and Sciences - No Department
Date Deposited: 25 Jun 2014 05:47
Last Modified: 16 Mar 2015 06:41
Uncontrolled Keywords: planets and satellites; stars; BD +20 2457; planetary systems
Fields of Research : 02 Physical Sciences > 0201 Astronomical and Space Sciences > 020110 Stellar Astronomy and Planetary Systems
02 Physical Sciences > 0201 Astronomical and Space Sciences > 020108 Planetary Science (excl. Extraterrestrial Geology)
01 Mathematical Sciences > 0102 Applied Mathematics > 010204 Dynamical Systems in Applications
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970102 Expanding Knowledge in the Physical Sciences
Identification Number or DOI: 10.1093/mnras/stu081
URI: http://eprints.usq.edu.au/id/eprint/25355

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