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- W3098582721 abstract "We report on the detections of planetary companions orbiting around three evolved intermediate-mass stars based on precise radial velocity measurements at Okayama Astrophysical Observatory. HD 2952 (K0III, 2.5 |$M_{odot}$|) and |$omega$| Ser (G8III, 2.2 |$M_{odot}$|) host a relatively low-mass planet with minimum masses of |$m_2$| sin|$i =$| 1.6 |$M_{rm J}$| and 1.7 |$M_{rm J}$| in nearly circular orbits with periods of |$P =$| 312 and 277 d, respectively. HD 120084 (G7 III, 2.4 |$M_{odot}$|) hosts an eccentric planet with |$m_2$| sin|$i =$| 4.5 |$M_{rm J}$| in an orbit with |$P =$| 2082 d and an eccentricity of |$e =$| 0.66. The planet has one of the largest eccentricities among those ever discovered around evolved intermediate-mass stars, almost all of which have an eccentricity smaller than 0.4. We also show that the radial-velocity variations of stellar oscillations for G giants can be averaged out below a level of a few m s|$^{-1}$|, at least on a timescale of a week by high-cadence observations. This enables us to detect a super-Earth and a Neptune-mass planet in short-period orbits even around such giant stars." @default.
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- W3098582721 date "2013-08-25" @default.
- W3098582721 modified "2023-09-30" @default.
- W3098582721 title "Planetary Companions to Three Evolved Intermediate-Mass Stars: HD 2952, HD 120084, and<i>ω</i>Serpentis" @default.
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- W3098582721 doi "https://doi.org/10.1093/pasj/65.4.85" @default.
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