Forever alone? Testing single eccentric planetary systems for multiple companions

Determining the orbital eccentricity of an extrasolar planet is critically important for understanding the system's dynamical environment and history. However, eccentricity is often poorly determined or entirely mischaracterized due to poor observational sampling, low signal-to-noise, and/or de...

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Bibliographic Details
Published in:arXiv.org 2013-07
Main Authors: Wittenmyer, Robert A, Wang, Songhu, Horner, Jonathan, Tinney, C G, Butler, R P, Jones, H R A, O'Toole, S J, Bailey, J, Carter, B D, Salter, G S, Wright, D, Ji-Lin, Zhou
Format: Article
Language:English
Subjects:
Circular orbits
Dynamic stability
Eccentric orbits
Extrasolar planets
Planetary systems
Online Access:Get full text
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Summary:Determining the orbital eccentricity of an extrasolar planet is critically important for understanding the system's dynamical environment and history. However, eccentricity is often poorly determined or entirely mischaracterized due to poor observational sampling, low signal-to-noise, and/or degeneracies with other planetary signals. Some systems previously thought to contain a single, moderate-eccentricity planet have been shown, after further monitoring, to host two planets on nearly-circular orbits. We investigate published apparent single-planet systems to see if the available data can be better fit by two lower-eccentricity planets. We identify nine promising candidate systems and perform detailed dynamical tests to confirm the stability of the potential new multiple-planet systems. Finally, we compare the expected orbits of the single- and double-planet scenarios to better inform future observations of these interesting systems.
ISSN:2331-8422
DOI:10.48550/arxiv.1307.0894