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Thread: gas giant planets detected around metal poor giants

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    Default gas giant planets detected around metal poor giants



    https://phys.org/news/2018-04-japane...t-planets.html

    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.
    PS I've recently become less interested in posting planet discoveries since they are become rather routine. This seemed and exception because of the peculiarities. Also note the relatively small (1.88 meter) scope used.
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    Default Re: gas giant planets detected around metal poor giants

    Quote Originally Posted by not_Fritz_Argelander View Post
    https://phys.org/news/2018-04-japane...t-planets.html



    PS I've recently become less interested in posting planet discoveries since they are become rather routine. This seemed and exception because of the peculiarities. Also note the relatively small (1.88 meter) scope used.
    Peculiarities appears to be a very appropriate word in this case. Cant wait to see the first hypothesese to try and explain it.
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    Default Re: gas giant planets detected around metal poor giants

    Thanks for the article not_Fritz! I can never get enough exoplanet news, just waiting for that earth-like planet with H2O to be found.
    Michael
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