Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The abundance of galactic planets from OGLE-III 2002 microlensing data   From the 389 2002 OGLE-III observations of Galactic Bulge microlensing events
we select 321 that are well described by a point-source point-lens lightcurve
model. From this sample we identify n=1 event, 2002-BLG-055, which we regard as
a strong planetary lensing candidate, and another, 2002-BLG-140, which is a
possible candidate. If each of the 321 lens stars has 1 planet with a mass
ratio q=m/M=10^{-3} and orbit radius a=R_E, the Einstein ring radius, analysis
of detection efficiencies indicates that 14 planets should have been detectable
with \Delta\chi^2 > 25. Assuming our candidate is due to planetary lensing,
then the abundance of planets with q=10^{-3} and a=R_E is n_p \approx n/14 =
7%. Conversion to physical units (M_Jup, and AU) gives the abundance of `cool
Jupiters' (m \approx M_Jup, a \approx 4 AU) per lens star as n_p \approx n/5.5
= 18%. The detection probability scales roughly with q and
(\Delta\chi^2)^{-1/2}, and drops off from a peak at a \approx 4 AU like a
Gaussian with a dispersion of 0.4 dex.

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The categories of this paper are: gr-qc
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The categories of this paper are: acc-phys
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The categories of this paper are: cmp-lg
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The categories of this paper are: physics
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The categories of this paper are: plasm-ph
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The categories of this paper are: hep-th
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The categories of this paper are: cs
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The categories of this paper are: nucl-th
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The categories of this paper are: patt-sol
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The categories of this paper are: alg-geom
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The categories of this paper are: ao-sci
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The categories of this paper are: dg-ga
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The categories of this paper are: chem-ph
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The categories of this paper are: funct-an
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The categories of this paper are: mtrl-th
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The categories of this paper are: quant-ph