A Trio of Giant Planets Orbiting Evolved Star HD 184010
Huan-Yu Teng, Bun'ei Sato, Takuya Takarada, Masashi Omiya, Hiroki, Harakawa, Makiko Nagasawa, Ryo Hasegawa, Hideyuki Izumiura, Eiji Kambe,, Michitoshi Yoshida, Yoichi Itoh, Hiroyasu Ando, Eiichiro Kokubo, Shigeru Ida

TL;DR
This paper reports the discovery of a unique triple-giant-planet system orbiting an evolved star, using precise radial velocity measurements, revealing a compact configuration with near-circular orbits and no mean motion resonance.
Contribution
First discovery of a multi-planet system around a highly evolved star with more than two giant planets in intermediate orbital periods.
Findings
Three giant planets with minimum masses around 0.3-0.45 M_J discovered.
Planets have orbital periods of approximately 286, 484, and 836 days.
System remains stable over 1 Gyr with near-circular, coplanar orbits.
Abstract
We report the discovery of a triple-giant-planet system around an evolved star HD 184010 (HR 7421, HIP 96016). This discovery is based on observations from Okayama Planet Search Program, a precise radial velocity survey, undertaken at Okayama Astrophysical Observatory between 2004 April and 2021 June. The star is K0 type and located at beginning of the red-giant branch. It has a mass of , a radius of , and a surface gravity of . The planetary system is composed of three giant planets in a compact configuration: The planets have minimum masses of , , and , and orbital periods of ,…
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