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        The Anglo-Australian Planet Search XXV : A Candidate Massive Saturn Analog Orbiting HD 30177

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        Accepted_Manuscript.pdf (PDF, 3Mb)
        Author
        Wittenmyer, Robert A.
        Horner, Jonathan
        Mengel, M. W.
        Butler, R. P.
        Tinney, C. G.
        Carter, B. D.
        Jones, H. R. A.
        Anglada-Escude, G.
        Bailey, J.
        O'Toole, Simon J.
        Attention
        2299/19558
        Abstract
        We report the discovery of a second long-period giant planet orbiting HD 30177, a star previously known to host a massive Jupiter analog (HD 30177b: a=3.8$\pm$0.1 au, m sin $i=9.7\pm$0.5 Mjup). HD 30177c can be regarded as a massive Saturn analog in this system, with a=9.9$\pm$1.0 au and m sin $i=7.6\pm$3.1 Mjup. The formal best fit solution slightly favours a closer-in planet at $a\sim$7 au, but detailed n-body dynamical simulations show that configuration to be unstable. A shallow local minimum of longer-period, lower-eccentricity solutions was found to be dynamically stable, and hence we adopt the longer period in this work. The proposed $\sim$32 year orbit remains incomplete; further monitoring of this and other stars is necessary to reveal the population of distant gas giant planets with orbital separations $a\sim$10 au, analogous to that of Saturn.
        Publication date
        2017-03-20
        Published in
        The Astronomical Journal
        Published version
        https://doi.org/10.3847/1538-3881/aa5f17
        Other links
        http://hdl.handle.net/2299/19558
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