A Dynamical Investigation of the Proposed BD +20 2457 System

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 timescales 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-fit 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.

Accepted for publication in Monthly Notices of the Royal Astronomical Society; 9 pages, 4 figures, 1 table

References in corpus (2)

• A Detailed Analysis of the HD 73526 2:1 Resonant Planetary System
• 2001 QR322: a dynamically unstable Neptune Trojan?

Cited by in corpus (17)

• Solar System Physics for Exoplanet Research
• Giant planets around two intermediate-mass evolved stars and confirmation of the planetary nature of HIP67851 c
• The Pan-Pacific Planet Search. II. Confirmation of a two-planet system around HD 121056
• The Anglo-Australian Planet Search XXV: A Candidate Massive Saturn Analog Orbiting HD 30177
• Precise radial velocities of giant stars VI. A possible 2:1 resonant planet pair around the K giant star $\eta$ Cet
• Planets around the evolved stars 24 Booties and $\gamma$ Libra: A 30d-period planet and a double giant-planet system in possible 7:3 MMR
• Precise radial velocities of giant stars. XI. Two brown dwarfs in 6:1 mean motion resonance around the K giant star $\nu$ Ophiuchi
• A Pair of Giant Planets around the Evolved Intermediate-Mass Star HD 47366: Multiple Circular Orbits or a Mutually Retrograde Configuration
• Prospecting for exo-Earths in multiple planet systems with a gas giant
• Predicting multiple planet stability and habitable zone companions in the TESS era
• Properties of the single Jovian planet population and the pursuit of Solar system analogues
• The HD 181433 Planetary System: Dynamics and a New Orbital Solution
• Chaos in multiplanetary extrasolar systems
• Planets around evolved intermediate-mass stars in open clusters II. Are there really planets around IC4651No9122, NGC2423No3 and NGC4349No127?
• Searching for Extragalactic Exoplanetary Systems: the Curious Case of BD+20 2457
• Re-analysing the dynamical stability of the HD 47366 planetary system
• On the RZ Draconis Sub-stellar Circumbinary Companions Stability Study of the Proposed Sub-stellar Circumbinary System