We report the detections of planetary companions orbiting around three evolved intermediate-mass stars from 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 mass of m _ { 2 } \sin i = 1.6 ~ { } M _ { J } and 1.7 ~ { } M _ { J } in nearly circular orbits with period 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 _ { J } in an orbit with P = 2082 d and 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 eccentricity smaller than 0.4 .
We also show that radial velocity variations of stellar oscillations for G giants can be averaged out below a level of a few m s ^ { -1 } at least in timescale of a week by high cadence observations , which enables us to detect a super-Earth and a Neptune-mass planet in short-period orbits even around such giant stars .