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Title:
A dynamical investigation of the proposed BD +20 2457 system
Authors:
Horner, J.; Wittenmyer, R. A.; Hinse, T. C.; Marshall, J. P.
Affiliation:
AA(School of Physics, University of New South Wales, Sydney, NSW 2052, Australia; Australian Centre for Astrobiology, University of New South Wales, Sydney, NSW 2052, Australia ), AB(School of Physics, University of New South Wales, Sydney, NSW 2052, Australia; Australian Centre for Astrobiology, University of New South Wales, Sydney, NSW 2052, Australia), AC(Korea Astronomy and Space Science Institute, 776 Daedeokdae-ro Yuseong-gu 305-348 Daejeon, Korea), AD(Departamento de Física Teórica, Facultad de Ciencias, Universidad Autónoma de Madrid, Cantoblanco, E-28049 Madrid, Spain)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 439, Issue 1, p.1176-1181 (MNRAS Homepage)
Publication Date:
03/2014
Origin:
OUP
Astronomy Keywords:
planets and satellites: general, stars: individual: BD +20 2457, planetary systems
Abstract Copyright:
2014 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society
DOI:
10.1093/mnras/stu081
Bibliographic Code:
2014MNRAS.439.1176H

Abstract

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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