A Second Giant Planet In 3:2 Mean-Motion Resonance In The HD 204313 System

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Date

2012-07

Authors

Robertson, Paul
Horner, Jonathan
Wittenmyer, Robert A.
Endl, Michael
Cochran, William D.
MacQueen, Phillip J.
Brugamyer, Erik J.
Simon, Attila E.
Barnes, Stuart I.
Caldwell, Caroline

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Journal ISSN

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Abstract

We present eight years of high-precision radial velocity (RV) data for HD 204313 from the 2.7 m Harlan J. Smith Telescope at McDonald Observatory. The star is known to have a giant planet (M sin i = 3.5 M-J) on a similar to 1900 day orbit, and a Neptune-mass planet at 0.2 AU. Using our own data in combination with the published CORALIE RVs of Segransan et al., we discover an outer Jovian (M sin i = 1.6 M-J) planet with P similar to 2800 days. Our orbital fit suggests that the planets are in a 3: 2 mean motion resonance, which would potentially affect their stability. We perform a detailed stability analysis and verify that the planets must be in resonance.

Department

Astronomy

Description

Keywords

planetary systems, planets and satellites: dynamical evolution and, stability, stars: individual (hd 204313), techniques: radial velocities, solar-system, timing variations, trojan asteroids, search program, long-period, low-mass, stars, jupiters, spectrometer, stability, astronomy & astrophysics

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Citation

Robertson, Paul, J. Horner, Robert A. Wittenmyer, Michael Endl, William D. Cochran, Phillip J. MacQueen, Erik J. Brugamyer, Attila E. Simon, Stuart I. Barnes, and Caroline Caldwell. "A second giant planet in 3: 2 mean-motion resonance in the HD 204313 system." The Astrophysical Journal, Vol. 754, No. 1 (Jul., 2012): 50.

URI

http://hdl.handle.net/2152/34675

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