Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Pulsating sdB+M Eclipsing System NY Virginis and its Circumbinary
  Planets   We searched for circumbinary planets orbiting NY Vir in historical eclipse
times including our long-term CCD data. Sixty-eight times of minimum light with
accuracies better than 10 s were used for the ephemeris computations. The best
fit to those timings indicated that the orbital period of NY Vir has varied due
to a combination of two sinusoids with periods of $P_3$=8.2 yr and $P_4$=27.0
yr and semi-amplitudes of $K_3$=6.9 s and $K_4$=27.3 s, respectively. The
periodic variations most likely arise from a pair of light-time effects due to
the presence of third and fourth bodies that are gravitationally bound to the
eclipsing pair. We have derived the orbital parameters and the minimum masses,
$M_3 \sin i_3$ = 2.8 M$\rm_{Jup}$ and $M_4 \sin i_4$ = 4.5 M$\rm_{Jup}$, of
both objects. A dynamical analysis suggests that the outer companion is less
likely to orbit the binary on a circular orbit. Instead we show that future
timing data might push its eccentricity to moderate values for which the system
exhibits long-term stability. The results demonstrate that NY Vir is probably a
star-planet system, which consists of a very close binary star and two giant
planets. The period ratio $P_{3}/P_{4}$ suggests that a long-term gravitational
interaction between them would result in capture into a nearly 3:10 mean motion
resonance. When the presence of the circumbinary planets is verified and
understood more comprehensively, the formation and evolution of this planetary
system should be advanced greatly.

22
The categories of this paper are: chao-dyn
37
The categories of this paper are: supr-con
21
The categories of this paper are: adap-org
12
The categories of this paper are: nucl-th
4
The categories of this paper are: cond-mat
32
The categories of this paper are: atom-ph
31
The categories of this paper are: ao-sci
16
The categories of this paper are: stat
19
The categories of this paper are: eess
28
The categories of this paper are: alg-geom
11
The categories of this paper are: hep-lat
9
The categories of this paper are: nlin
20
The categories of this paper are: acc-phys
23
The categories of this paper are: solv-int
1
The categories of this paper are: cs
15
The categories of this paper are: nucl-ex