  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.
