Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: It takes a village to raise a tide: nonlinear multiple-mode coupling and
  mode identification in KOI-54   We explore the tidal excitation of stellar modes in binary systems using
Kepler observations of the remarkable eccentric binary KOI-54 (HD 187091; KIC
8112039), which displays strong ellipsoidal variation as well as a variety of
linear and nonlinear pulsations. We report the amplitude and phase of over 120
harmonic and anharmonic pulsations in the system. We use pulsation phases to
determine that the two largest-amplitude pulsations, the 90th and 91st
harmonics, most likely correspond to axisymmetric m=0 modes in both stars, and
thus cannot be responsible for resonance locks as had been recently proposed.
We find evidence that the amplitude of at least one of these two pulsations is
decreasing with a characteristic timescale of ~100 yr. We also use the
pulsations' phases to confirm the onset of the traveling wave regime for
harmonic pulsations with frequencies <~50 Omega_orbit, in agreement with
theoretical expectations. We present evidence that many pulsations that are not
harmonics of the orbital frequency correspond to modes undergoing simultaneous
nonlinear coupling to multiple linearly driven parent modes. Since coupling
among multiple modes can lower the threshold for nonlinear interactions,
nonlinear phenomena may be easier to observe in highly eccentric systems, where
broader arrays of driving frequencies are available. This may help to explain
why the observed amplitudes of the linear pulsations are much smaller than the
theoretical threshold for decay via three-mode coupling.

30
The categories of this paper are: q-alg
11
The categories of this paper are: hep-lat
16
The categories of this paper are: stat
32
The categories of this paper are: atom-ph
36
The categories of this paper are: cmp-lg
13
The categories of this paper are: quant-ph
22
The categories of this paper are: chao-dyn
14
The categories of this paper are: math-ph
19
The categories of this paper are: eess
12
The categories of this paper are: nucl-th
17
The categories of this paper are: q-fin
3
The categories of this paper are: physics
18
The categories of this paper are: econ
1
The categories of this paper are: cs
33
The categories of this paper are: plasm-ph
8
The categories of this paper are: hep-ex