Planets at 24 Bo÷ and Gam Lib

Go down

Planets at 24 Bo÷ and Gam Lib

Post by Sirius_Alpha on 11th April 2018, 8:38 pm

Planets around the evolved stars 24 Booties and γ Libra: A 30d-period planet and a double giant-planet system in possible 7:3 MMR
https://arxiv.org/abs/1804.04008

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 0.99M⊙, a radius of 10.64R⊙, and a metallicity of [Fe/H]=−0.77. The star hosts one planet with a minimum mass of 0.91MJup and an orbital period of 30.35d. 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 150d, which are probably attributed to stellar activity. The star is one of the lowest-metallicity stars orbited by planets currently known. γ Lib (K0III) is also a metal-poor giant with a mass of 1.47M⊙, a radius of 11.1R⊙, and [Fe/H]=−0.30. The star hosts two planets with minimum masses of 1.02MJup and 4.58MJup, and periods of 415d and 964d, respectively. The star has the second lowest metallicity among the giant stars hosting more than two planets. Dynamical stability analysis for the γ Lib system sets a minimum orbital inclination angle to be about 70∘ and suggests that the planets are in 7:3 mean-motion resonance, though the current best-fitted orbits to the radial-velocity data are not totally regular.

_________________
Caps Lock: Cruise control for 'Cool'!
avatar
Sirius_Alpha
Admin
Admin

Number of posts : 3630
Location : Earth
Registration date : 2008-04-06

View user profile http://solar-flux.forumandco.com/

Back to top Go down

Re: Planets at 24 Bo÷ and Gam Lib

Post by Edasich on 12th April 2018, 5:25 am

Zubenelhakrabi b (or Ab). It's nice to reveal that known bright stars too are hosting exoplanets.
avatar
Edasich
dM star
dM star

Number of posts : 1544
Location : Tau Ceti g - Mid Latitudes
Registration date : 2008-06-02

View user profile

Back to top Go down

Back to top


 
Permissions in this forum:
You cannot reply to topics in this forum