We report detections of new exoplanets from a radial velocity ( RV ) survey of metal-rich FGK stars by using three telescopes .
By optimizing our RV analysis method to long time-baseline observations , we have succeeded in detecting five new Jovian-planets around three metal-rich stars HD 1605 , HD 1666 , and HD 67087 with the masses of 1.3 M _ { \odot } , 1.5 M _ { \odot } , and 1.4 M _ { \odot } , respectively .
A K1 subgiant star HD 1605 hosts two planetary companions with the minimum masses of M _ { p } \sin i = 0.96 M _ { JUP } and 3.5 M _ { JUP } in circular orbits with the planets ’ periods P = 577.9 days and 2111 days , respectively .
HD 1605 shows a significant linear trend in RVs .
Such a system consisting of Jovian planets in circular orbits has rarely been found and thus HD 1605 should be an important example of a multi-planetary system that is likely unperturbed by planet-planet interactions .
HD 1666 is a F7 main sequence star which hosts an eccentric and massive planet of M _ { p } \sin i = 6.4 M _ { JUP } in the orbit with a _ { p } = 0.94 AU and an eccentricity e = 0.63 .
Such an eccentric and massive planet can be explained as a result of planet-planet interactions among Jovian planets .
While we have found the large residuals of \mathrm { rms } = 35.6 { m s } ^ { -1 } , the periodogram analysis does not support any additional periodicities .
Finally , HD 67087 hosts two planets of M _ { p } \sin i = 3.1 M _ { JUP } and 4.9 M _ { JUP } in orbits with P = 352.2 days and 2374 days , and e = 0.17 and 0.76 , respectively .
Although the current RVs do not lead to accurate determinations of its orbit and mass , HD 67087 c can be one of the most eccentric planets ever discovered in multiple systems .