Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The HARPS search for Earth-like planets in the habitable zone: I -- Very
  low-mass planets around HD20794, HD85512 and HD192310   In 2009 we started an intense radial-velocity monitoring of a few nearby,
slowly-rotating and quiet solar-type stars within the dedicated HARPS-Upgrade
GTO program. The goal of this campaign is to gather very-precise
radial-velocity data with high cadence and continuity to detect tiny signatures
of very-low-mass stars that are potentially present in the habitable zone of
their parent stars. Ten stars were selected among the most stable stars of the
original HARPS high-precision program that are uniformly spread in hour angle,
such that three to four of them are observable at any time of the year. For
each star we recorded 50 data points spread over the observing season. The data
points consist of three nightly observations with a total integration time of
10 minutes each and are separated by two hours. This is an observational
strategy adopted to minimize stellar pulsation and granulation noise. We
present the first results of this ambitious program. The radial-velocity data
and the orbital parameters of five new and one confirmed low-mass planets
around the stars HD20794, HD85512, and HD192310 are reported and discussed,
among which is a system of three super-Earths and one that harbors a 3.6
Earth-mass planet at the inner edge of the habitable zone. This result already
confirms previous indications that low-mass planets seem to be very frequent
around solar-type stars and that this may occur with a frequency higher than
30%

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The categories of this paper are: hep-ex
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The categories of this paper are: q-alg
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The categories of this paper are: hep-lat
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The categories of this paper are: dg-ga
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The categories of this paper are: cond-mat
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The categories of this paper are: comp-gas
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The categories of this paper are: plasm-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: solv-int
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The categories of this paper are: mtrl-th
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The categories of this paper are: cmp-lg
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The categories of this paper are: chem-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: adap-org
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The categories of this paper are: cs
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The categories of this paper are: hep-th