The Anglo-Australian Planet Search. XXII. Two new multi-planet systems

Robert A. Wittenmyer*, J. Horner, Mikko Tuomi, G. S. Salter, C. G. Tinney, R. P. Butler, H. R A Jones, S. J. O'Toole, J. Bailey, B. D. Carter, J. S. Jenkins, Z. Zhang, S. S. Vogt, Eugenio J. Rivera

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    51 Citations (Scopus)

    Abstract

    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 HD142 has a period of 6005 ± 427days, and a minimum mass of 5.3 M Jup. HD142c is thus a new Jupiter analog: a gas-giant planet with a long period and low eccentricity (e = 0.21 ± 0.07). The second planet in the HD159868 system has a period of 352.3 ± 1.3days and m sin i = 0.73 ± 0.05 M 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.

    Original languageEnglish
    Article number169
    Pages (from-to)1-12
    Number of pages12
    JournalAstrophysical Journal
    Volume753
    Issue number2
    DOIs
    Publication statusPublished - 10 Jul 2012

    Keywords

    • planetary systems
    • stars: individual (HD 142, HD 159868)
    • techniques: radial velocities

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