HD 83443c: A Highly Eccentric Giant Planet on a 22 yr Orbit
Article
Article Title | HD 83443c: A Highly Eccentric Giant Planet on a 22 yr Orbit |
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ERA Journal ID | 1048 |
Article Category | Article |
Authors | Errico, Adriana (Author), Wittenmyer, Robert A. (Author), Horner, Jonathan (Author), Li, Zhexing (Author), Brandt, G. Mirek (Author), Kane, Stephen R. (Author), Fetherolf, Tara (Author), Holt, Timothy R. (Author), Carter, Brad (Author), Clark, Jake T. (Author), Butler, R. P. (Author), Tinney, C. G. (Author), Ballard, Sarah (Author), Bowler, Brendan P. (Author), Kielkopf, John (Author), Liu, Huigen (Author), Plavchan, Peter P. (Author), Shporer, Avi (Author), Zhang, Hui (Author), Wright, Duncan J. (Author), Addison, Brett C. (Author), Mengel, Matthew W. (Author) and Okumura, Jack (Author) |
Journal Title | The Astronomical Journal |
Journal Citation | 163 (6), pp. 1-19 |
Article Number | 273 |
Number of Pages | 19 |
Year | 2022 |
Publisher | IOP Publishing |
Place of Publication | United States |
ISSN | 0004-6256 |
1538-3881 | |
Digital Object Identifier (DOI) | https://doi.org/10.3847/1538-3881/ac6589 |
Web Address (URL) | https://iopscience.iop.org/article/10.3847/1538-3881/ac6589 |
Abstract | We report the discovery of a highly eccentric long-period Jovian planet orbiting the hot-Jupiter host HD 83443. By combining radial velocity data from four instruments (AAT/UCLES, Keck/HIRES, HARPS, Minerva-Australis) spanning more than two decades, we find evidence for a planet with m sin i=1.35-0.06+0.07 M J, moving on an orbit with a = 8.0 ± 0.8 au and eccentricity e = 0.76 ± 0.05. We combine our radial velocity analysis with Gaia eDR3 /Hipparcos proper motion anomalies and derive a dynamical mass of 1.5-0.2+0.5MJup . We perform a detailed dynamical simulation that reveals locations of stability within the system that may harbor additional planets, including stable regions within the habitable zone of the host star. HD 83443 is a rare example of a system hosting a hot Jupiter and an exterior planetary companion. The high eccentricity of HD 83443c suggests that a scattering event may have sent the hot Jupiter to its close orbit while leaving the outer planet on a wide and eccentric path. |
Keywords | Planet hosting stars; Radial velocity; Exoplanet astronomy; Exoplanet; dynamics; Subgiant stars; Astrometry; Astrophysics - Earth and Planetary Astrophysics |
ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
Byline Affiliations | Centre for Astrophysics |
University of California, United States | |
Carnegie Institution of Washington, United States | |
University of New South Wales | |
University of Florida, United States | |
University of Texas at Austin, United States | |
University of Louisville, United States | |
Nanjing University, China | |
George Mason University, United States | |
Massachusetts Institute of Technology, United States | |
Chinese Academy of Sciences, China | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q77v8/hd-83443c-a-highly-eccentric-giant-planet-on-a-22-yr-orbit
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