The Anglo-Australian planet search. XXV. A candidate massive Saturn analog orbiting HD 30177

Wittenmyer, Robert A. and Horner, Jonathan and Mengel, M. W. and Butler, R. P. and Wright, D. J. and Tinney, C. G. and Carter, B. D. and Jones, H. R. A. and Anglada-Escude, G. and Bailey, J. and O'Toole, Simon J. (2017) The Anglo-Australian planet search. XXV. A candidate massive Saturn analog orbiting HD 30177. The Astronomical Journal, 153 (4). pp. 1-12. ISSN 0004-6256

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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.

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Access to published version in accordance with the copyright policy of the publisher.
Faculty / Department / School: Current - Faculty of Health, Engineering and Sciences - School of Agricultural, Computational and Environmental Sciences
Date Deposited: 06 Apr 2017 04:34
Last Modified: 08 Oct 2018 04:24
Uncontrolled Keywords: planetary systems; radial velocities; HD 30177
Fields of Research : 02 Physical Sciences > 0201 Astronomical and Space Sciences > 020110 Stellar Astronomy and Planetary Systems
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970102 Expanding Knowledge in the Physical Sciences
Identification Number or DOI: 10.3847/1538-3881/aa5f17

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