Planets around the evolved stars 24 Booties and $\gamma$ Libra: A 30d-period planet and a double giant-planet system in possible 7:3 MMR
Takuya Takarada, Bun'ei Sato, Masashi Omiya, Hiroki Harakawa, Makiko, Nagasawa, Hideyuki Izumiura, Eiji Kambe, Yoichi Takeda, Michitoshi Yoshida,, Yoichi Itoh, Hiroyasu Ando, Eiichiro Kokubo, Shigeru Ida

TL;DR
This study reports the discovery of a short-period planet around 24 Booties and a possible 7:3 mean-motion resonance in a double giant-planet system around gamma Libra, both around evolved, metal-poor stars.
Contribution
First detection of a 30-day period planet around an evolved star and evidence for a 7:3 MMR in a multi-planet system around a low-metallicity giant star.
Findings
24 Boo hosts a 0.91 M_Jup planet with a 30.35-day period.
Gamma Lib hosts two planets with periods of 415 and 964 days.
The gamma Lib system may be in a 7:3 mean-motion resonance.
Abstract
We report the detection of planets around two evolved giant stars from radial velocity measurements at Okayama Astrophysical observatory. 24 Boo (G3IV) has a mass of , a radius of , and a metallicity of . The star hosts one planet with a minimum mass of and an orbital period of . The planet has one of the shortest orbital periods among those ever found around evolved stars by radial-veloocity methods. The stellar radial velocities show additional periodicity with , which are probably attributed to stellar activity. The star is one of the lowest-metallicity stars orbited by planets currently known. Lib (K0III) is also a metal-poor giant with a mass of , a radius of , and . The star hosts two planets with minimum masses of…
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