Forever alone? Testing single eccentric planetary systems for multiple companions

Wittenmyer, Robert A. and Wang, Songhu and Horner, Jonathan and Tinney, C. G. and Butler, R. P. and Jones, H. R. A. and O'Toole, S. J. and Bailey, J. and Carter, B. D. and Salter, G. S. and Wright, D. and Zhou, Ji-Lin (2013) Forever alone? Testing single eccentric planetary systems for multiple companions. Astrophysical Journal, Supplement Series , 208 (1). pp. 1-16. ISSN 0067-0049

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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.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Published version made accessible, in accordance with the copyright policy of the publisher.
Faculty / Department / School: Current - Faculty of Health, Engineering and Sciences - No Department
Date Deposited: 01 Oct 2013 04:54
Last Modified: 17 May 2017 02:03
Uncontrolled Keywords: planetary systems; radial velocities
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: 10.1088/0067-0049/208/1/2
URI: http://eprints.usq.edu.au/id/eprint/24101

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