Kavli Affiliate: Avi Shporer
| First 5 Authors: Adriana Errico, Robert A. Wittenmyer, Jonathan Horner, Zhexing Li, Gregory Mirek Brandt
| Summary:
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=8.0pm$0.8,au
and eccentricity $e=0.76pm$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.
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