Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Transit polarimetry of exoplanetary system HD189733   We present and discuss a polarimetric effect caused by a planet transiting
the stellar disk thus breaking the symmetry of the light distribution and
resulting in linear polarization of the partially eclipsed star. Estimates of
this effect for transiting planets have been made only recently. In particular,
we demonstrate that the maximum polarization during transits depends strongly
on the centre-to-limb variation of the linear polarization of the host star.
However, observational and theoretical studies of the limb polarization have
largely concentrated on the Sun. Here we solve the radiative transfer problem
for polarized light and calculate the centre-to-limb polarization for one of
the brightest transiting planet host HD189733 taking into account various
opacities. Using that we simulate the transit effect and estimate the
variations of the flux and the linear polarization for HD189733 during the
event. As the spots on the stellar disk also break the limb polarization
symmetry we simulate the flux and polarization variation due to the spots on
the stellar disk.

15
The categories of this paper are: nucl-ex
31
The categories of this paper are: ao-sci
17
The categories of this paper are: q-fin
2
The categories of this paper are: math
22
The categories of this paper are: chao-dyn
32
The categories of this paper are: atom-ph
29
The categories of this paper are: funct-an
9
The categories of this paper are: nlin
28
The categories of this paper are: alg-geom
7
The categories of this paper are: hep-th
23
The categories of this paper are: solv-int
34
The categories of this paper are: chem-ph
26
The categories of this paper are: bayes-an
14
The categories of this paper are: math-ph
36
The categories of this paper are: cmp-lg
35
The categories of this paper are: mtrl-th