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WITTENMYER, Robert A; HORNER, J; JENKINS, J. S; ZHANG, Z; VOGT, S. S; RIVERA, Eugenio J; TUOMI, Mikko; SALTER, G. S; TINNEY, C. G; BUTLER, R. P; JONES, H. R. A; O'TOOLE, S. J; BAILEY, J; CARTER, B. D
The Astrophysical journal, 07/2012, Letnik: 753, Številka: 2Journal Article
We report the detection of two new planets from the Anglo-Australian Planet Search. These planets orbit two stars each previously known to host one planet. The new planet orbiting HD 142 has a period of 6005 + or - 427 days, and a minimum mass of 5.3 M sub(Jup). HD 142c is thus a new Jupiter analog: a gas-giant planet with a long period and low eccentricity (e = 0.21 + or - 0.07). The second planet in the HD 159868 system has a period of 352.3 + or - 1.3 days and m sin i = 0.73 + or - 0.05 M sub(Jup). In both of these systems, including the additional planets in the fitting process significantly reduced the eccentricity of the original planet. These systems are thus examples of how multiple-planet systems can masquerade as moderately eccentric single-planet systems.
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