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

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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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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.



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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.