Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: MOA-2011-BLG-322Lb: a "second generation survey" microlensing planet   Global "second-generation" microlensing surveys aim to discover and
characterize extrasolar planets and their frequency, by means of
round-the-clock high-cadence monitoring of a large area of the Galactic bulge,
in a controlled experiment. We report the discovery of a giant planet in
microlensing event MOA-2011-BLG-322. This moderate-magnification event, which
displays a clear anomaly induced by a second lensing mass, was inside the
footprint of our second-generation microlensing survey, involving MOA, OGLE and
the Wise Observatory. The event was observed by the survey groups, without
prompting alerts that could have led to dedicated follow-up observations.
Fitting a microlensing model to the data, we find that the timescale of the
event was t_E=23.2 +/-0.8 days, and the mass ratio between the lens star and
its companion is q=0.028 +/-0.001. Finite-source effects are marginally
detected, and upper limits on them help break some of the degeneracy in the
system parameters. Using a Bayesian analysis that incorporates a Galactic
structure model, we estimate the mass of the lens at 0.39 +0.45/-0.19 M_sun, at
a distance of 7.56 +/-0.91 kpc. Thus, the companion is likely a planet of mass
11.6 +13.4/-5.6 M_J, at a projected separation of 4.3 +1.5/-1.2 AU, rather far
beyond the snow line. This is the first pure-survey planet reported from a
second-generation microlensing survey, and shows that survey data alone can be
sufficient to characterize a planetary model. With the detection of additional
survey-only planets, we will be able to constrain the frequency of extrasolar
planets near their systems' snow lines.

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The categories of this paper are: q-fin
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The categories of this paper are: mtrl-th
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The categories of this paper are: quant-ph
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The categories of this paper are: ao-sci
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The categories of this paper are: hep-th
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The categories of this paper are: comp-gas
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The categories of this paper are: stat
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The categories of this paper are: cmp-lg
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The categories of this paper are: gr-qc
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The categories of this paper are: econ
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The categories of this paper are: q-bio
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The categories of this paper are: atom-ph
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The categories of this paper are: eess
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The categories of this paper are: funct-an
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The categories of this paper are: solv-int
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The categories of this paper are: cs