The Pan-Pacific planet search. VI. Giant planets orbiting HD 86950 and HD 222076
Article
Article Title | The Pan-Pacific planet search. VI. Giant planets orbiting HD 86950 and HD 222076 |
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ERA Journal ID | 1048 |
Article Category | Article |
Authors | Wittenmyer, Robert A. (Author), Jones, M. I. (Author), Zhao, Jinglin (Author), Marshall, J. P. (Author), Butler, R. P. (Author), Tinney, C. G. (Author), Wang, Liang (Author) and Johnson, John Asher (Author) |
Journal Title | The Astronomical Journal |
Journal Citation | 153 (2), pp. 1-12 |
Article Number | 51 |
Number of Pages | 12 |
Year | 2017 |
Publisher | IOP Publishing |
Place of Publication | United States |
ISSN | 0004-6256 |
1538-3881 | |
Digital Object Identifier (DOI) | https://doi.org/10.3847/1538-3881/153/2/51 |
Web Address (URL) | http://iopscience.iop.org/article/10.3847/1538-3881/153/2/51 |
Abstract | We report the detection of two new planets orbiting the K giants HD 86950 and HD 222076, based on precise radial velocities obtained with three instruments: AAT/UCLES, FEROS, and CHIRON. HD 86950b has a period of 1270 ± 57 days at a=2.72+/- 0.08 au, and m sin i=3.6+/- 0.7 {M}{Jup}. HD 222076b has P=871+/- 19 days at a=1.83+/- 0.03 au, and m sin i=1.56+/- 0.11 {M}{Jup}. These two giant planets are typical of the population of planets known to orbit evolved stars. In addition, we find a high-amplitude periodic velocity signal (K∼ 50 m s‑1) in HD 29399 and show that it is due to stellar variability rather than Keplerian reflex motion. We also investigate the relation between planet occurrence and host-star metallicity for the 164-star Pan-Pacific Planet Search (PPPS) sample of evolved stars. In spite of the small sample of PPPS detections, we confirm the trend of increasing planet occurrence as a function of metallicity found by other studies of planets orbiting evolved stars. |
Keywords | planetary systems; stars: individual (HD 29399, HD 86950, HD 222076); techniques: radial velocities |
Contains Sensitive Content | Does not contain sensitive content |
ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
Public Notes | For access to this article, please click on the URL link provided. |
Byline Affiliations | Computational Engineering and Science Research Centre |
Pontifical Catholic University of Chile, Chile | |
University of New South Wales | |
University of New South Wales | |
Carnegie Institution of Washington, United States | |
Key Laboratory of Optical Astronomy, China | |
Center for Astrophysics Harvard and Smithsonian, United States | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q3x18/the-pan-pacific-planet-search-vi-giant-planets-orbiting-hd-86950-and-hd-222076
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