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

Wittenmyer, Robert A. and Horner, Jonathan and Mengel, M. W. ORCID: https://orcid.org/0000-0002-7830-6822 and Butler, R. P. and Wright, D. J. and Tinney, C. G. and Carter, B. D. ORCID: https://orcid.org/0000-0003-0035-8769 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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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.


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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/School / Institute/Centre: Historic - Faculty of Health, Engineering and Sciences - School of Agricultural, Computational and Environmental Sciences (1 Jul 2013 - 5 Sep 2019)
Faculty/School / Institute/Centre: Historic - Faculty of Health, Engineering and Sciences - School of Agricultural, Computational and Environmental Sciences (1 Jul 2013 - 5 Sep 2019)
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 (2008): 02 Physical Sciences > 0201 Astronomical and Space Sciences > 020110 Stellar Astronomy and Planetary Systems
Fields of Research (2020): 51 PHYSICAL SCIENCES > 5101 Astronomical sciences > 510109 Stellar astronomy and planetary systems
Socio-Economic Objectives (2008): E Expanding Knowledge > 97 Expanding Knowledge > 970102 Expanding Knowledge in the Physical Sciences
Identification Number or DOI: https://doi.org/10.3847/1538-3881/aa5f17
URI: http://eprints.usq.edu.au/id/eprint/30610

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