학술논문
HD 83443c: A highly eccentric giant planet on a 22-year orbit
Document Type
Working Paper
Author
Errico, Adriana; Wittenmyer, Robert A.; Horner, Jonathan; Li, Zhexing; Brandt, Gregory Mirek; Kane, Stephen R.; Fetherolf, Tara; Holt, Timothy R.; Carter, Brad; Butler, Jake T. Clark. Robert . P.; Tinney, Chris G.; Ballard, Sarah; Bowler, Brendan P.; Kielkopf, John; Liu, Huigen; Plavchan, Peter P.; Shporer, Avi; Zhang, Hui; Wright, Duncan J.; Addison, Brett C.; Mengel, Matthew W.; Okumura, Jack
Source
Subject
Language
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~$i=1.35^{+0.07}_{-0.06}$\,\mj, moving on an orbit with $a=8.0\pm$0.8\,au and eccentricity $e=0.76\pm$0.05. We combine our radial velocity analysis with \textit{Gaia} eDR3 /\textit{Hipparcos} proper motion anomalies and derive a dynamical mass of $1.5^{+0.5}_{-0.2} M_{\rm Jup}$. 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.