We present results from our ongoing spectroscopic search for giant planets within 1 AU around a well-defined sample of metal-poor stars with HIRES on the Keck 1 telescope .
We have achieved an rms radial velocity precision of \sim 8 m/s over a time-span of 1.5 years .
The data collected so far build toward evidence of the absence of very short-period ( < 1 month ) giant planets .
However , about 7 % of the stars in our sample exhibits velocity trends indicative of the existence of companions .
We place preliminary upper limits on the detectable companion mass as a function of orbital period , and compare them with the performance of ESA ’ s future space-borne high-precision astrometric observatory Gaia .