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American Astronomical Society, Astrophysical Journal Supplement, 1(208), p. 2, 2013

DOI: 10.1088/0067-0049/208/1/2

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Forever alone? Testing single eccentric planetary systems for multiple companions

Journal article published in 2013 by Robert A. Wittenmyer, Songhu Wang, Jonathan Horner, Cg G. Tinney ORCID, Rp P. Butler, Hra R. A. Jones ORCID, Sj J. O'Toole ORCID, D. Wright, J. Bailey, Bd D. Carter ORCID, Ji-Lin Zhou, Gs S. Salter
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

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. ; Comment: Accepted for publication in ApJS