Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Search for Low-Mass Exoplanets by Gravitational Microlensing at High
  Magnification   Observations of the gravitational microlensing event MOA 2003-BLG-32/OGLE
2003-BLG-219 are presented for which the peak magnification was over 500, the
highest yet reported. Continuous observations around the peak enabled a
sensitive search for planets orbiting the lens star. No planets were detected.
Planets 1.3 times heavier than Earth were excluded from more than 50 % of the
projected annular region from approximately 2.3 to 3.6 astronomical units
surrounding the lens star, Uranus-mass planets from 0.9 to 8.7 astronomical
units, and planets 1.3 times heavier than Saturn from 0.2 to 60 astronomical
units. These are the largest regions of sensitivity yet achieved in searches
for extrasolar planets orbiting any star.

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The categories of this paper are: solv-int
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The categories of this paper are: nlin
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The categories of this paper are: eess
34
The categories of this paper are: chem-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: patt-sol
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The categories of this paper are: comp-gas
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The categories of this paper are: chao-dyn
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The categories of this paper are: cmp-lg
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The categories of this paper are: atom-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: q-fin
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The categories of this paper are: ao-sci
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The categories of this paper are: hep-ph
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The categories of this paper are: econ
1
The categories of this paper are: cs