Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Toward a Galactic Distribution of Planets. I. Methodology & Planet
  Sensitivities of the 2015 High-Cadence Spitzer Microlens Sample   We analyze an ensemble of microlensing events from the 2015 Spitzer
microlensing campaign, all of which were densely monitored by ground-based
high-cadence survey teams. The simultaneous observations from Spitzer and the
ground yield measurements of the microlensing parallax vector $\pi_{\rm E}$,
from which compact constraints on the microlens properties are derived,
including $\lesssim$25\% uncertainties on the lens mass and distance. With the
current sample, we demonstrate that the majority of microlenses are indeed in
the mass range of M dwarfs. The planet sensitivities of all 41 events in the
sample are calculated, from which we provide constraints on the planet
distribution function. In particular, assuming a planet distribution function
that is uniform in $\log{q}$, where $q$ is the planet-to-star mass ratio, we
find a $95\%$ upper limit on the fraction of stars that host typical
microlensing planets of 49\%, which is consistent with previous studies. Based
on this planet-free sample, we develop the methodology to statistically study
the Galactic distribution of planets using microlensing parallax measurements.
Under the assumption that the planet distributions are the same in the bulge as
in the disk, we predict that $\sim$1/3 of all planet detections from the
microlensing campaigns with Spitzer should be in the bulge. This prediction
will be tested with a much larger sample, and deviations from it can be used to
constrain the abundance of planets in the bulge relative to the disk.

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The categories of this paper are: adap-org
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The categories of this paper are: chem-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: nucl-th
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The categories of this paper are: q-bio
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The categories of this paper are: solv-int
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The categories of this paper are: gr-qc
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The categories of this paper are: physics
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The categories of this paper are: quant-ph
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The categories of this paper are: nucl-ex
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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: acc-phys
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The categories of this paper are: math
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The categories of this paper are: econ
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The categories of this paper are: supr-con