Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Resolved imaging of the AR Puppis circumbinary disk   Circumbinary disks are common around post-asymptotic giant branch (post-AGB)
stars with a stellar companion on orbital time scales of a few 100 to few 1000
days. The presence of a disk is usually inferred from the system's spectral
energy distribution (SED), and confirmed, for a sub-sample, by interferometric
observations. We used the Spectro-Polarimetric High-contrast Exoplanet REsearch
(SPHERE) instrument on the Very Large Telescope to obtain extreme adaptive
optics assisted scattered light images of the post-AGB binary system AR Puppis.
Data have been obtained in the V, I, and H bands. Our observations have
produced the first resolved images of AR Puppis' circumbinary disk and confirm
its edge-on orientation. In our high angular-resolution and high dynamic-range
images we identify several structural components such as a dark mid-plane, the
disk surface, and arc-like features. We discuss the nature of these components
and use complementary photometric monitoring to relate them to the orbital
phase of the binary system. Because the star is completely obscured by the disk
at visible wavelengths, we conclude that the long-term photometric variability
of the system must be caused by variable scattering, not extinction, of star
light by the disk over the binary orbit. Finally, we discuss how the short disk
life times and fast evolution of the host stars compared to the ages at which
protoplanetary disks are typically observed make systems like AR Puppis
valuable extreme laboratories to study circumstellar disk evolution and
constrain the time scale of dust grain growth during the planet formation
process.

19
The categories of this paper are: eess
33
The categories of this paper are: plasm-ph
23
The categories of this paper are: solv-int
21
The categories of this paper are: adap-org
15
The categories of this paper are: nucl-ex
24
The categories of this paper are: dg-ga
14
The categories of this paper are: math-ph
5
The categories of this paper are: gr-qc
28
The categories of this paper are: alg-geom
13
The categories of this paper are: quant-ph
30
The categories of this paper are: q-alg
11
The categories of this paper are: hep-lat
3
The categories of this paper are: physics
8
The categories of this paper are: hep-ex
9
The categories of this paper are: nlin
27
The categories of this paper are: comp-gas