Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Keck/HIRES Doppler Search for Planets Orbiting Metal-Poor Dwarfs   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.

21
The categories of this paper are: adap-org
37
The categories of this paper are: supr-con
25
The categories of this paper are: patt-sol
1
The categories of this paper are: cs
8
The categories of this paper are: hep-ex
18
The categories of this paper are: econ
34
The categories of this paper are: chem-ph
28
The categories of this paper are: alg-geom
30
The categories of this paper are: q-alg
20
The categories of this paper are: acc-phys
12
The categories of this paper are: nucl-th
36
The categories of this paper are: cmp-lg
22
The categories of this paper are: chao-dyn
31
The categories of this paper are: ao-sci
11
The categories of this paper are: hep-lat
9
The categories of this paper are: nlin