We report the discovery of a new planet candidate orbiting the subgiant star HD 118203 with a period of P = 6.1335 days .
The best Keplerian solution yields an eccentricity e = 0.31 and a minimum mass m _ { 2 } \sin { i } = 2.1 M _ { Jup } for the planet .
This star has been observed with the ELODIE fiber-fed spectrograph as one of the targets in our planet-search programme biased toward high-metallicity stars , on-going since March 2004 at the Haute-Provence Observatory .
An analysis of the spectroscopic line profiles using line bisectors revealed no correlation between the radial velocities and the line-bisector orientations , indicating that the periodic radial-velocity signal is best explained by the presence of a planet-mass companion .
A linear trend is observed in the residuals around the orbital solution that could be explained by the presence of a second companion in a longer-period orbit .
We also present here our orbital solution for another slightly evolved star in our metal-rich sample , HD 149143 , recently proposed to host a 4-d period Hot Jupiter by the N2K consortium .
Our solution yields a period P =4.09 days , a marginally significant eccentricity e = 0.08 and a planetary minimum mass of 1.36 M _ { Jup } .
We checked that the shape of the spectral lines does not vary for this star as well .