Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Dust dynamics in planet-driven spirals   Context. Protoplanetary disks are known to host spiral features that are
observed in scattered light, ALMA continuum and more recently in CO gas
emission and gas dynamics. It is however unknown if spirals in gas and dust
trace the same morphology.
  Aims. We study the morphology and amplitude of dusty spirals as function of
Stokes number and the underlying mechanisms causing a difference from gas
spirals. We then construct a model to relate the deviation from Keplerian
rotation in the gas to a perturbation in surface density of gas and dust.
  Methods. We use FARGO-3D with dust implementation to numerically study the
spirals, after which the results are interpreted using a semi-analytical model.
This model is tested on observational data to predict the perturbation of the
spiral in gas dynamics based on the continuum data.
  Results. We find that the pitch angle of a spiral does not differ
significantly between gas and dust. The amplitude of the dust spiral decreases
with Stokes number (St) and starts to fade out at a typical St > 0.1 as the
dust becomes decoupled from the gas. The semianalytical model provides an
accurate and fast representation of the spiral in surface density of the dust
from the gas. We find a spiral in the TW Hya velocity residual map, never seen
before, which is a feature in the vertical velocity and has a kink at the
continuum gap, yielding strong evidence for a planet at 99 au.
  Conclusions. We built a model that gives an estimate of the underlying
dynamics of dust in a spiral, which can serve as a proof of planetary origin of
spirals and can be a probe for the Stokes number in the disk.

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The categories of this paper are: cmp-lg
5
The categories of this paper are: gr-qc
33
The categories of this paper are: plasm-ph
17
The categories of this paper are: q-fin
7
The categories of this paper are: hep-th
22
The categories of this paper are: chao-dyn
23
The categories of this paper are: solv-int
11
The categories of this paper are: hep-lat
35
The categories of this paper are: mtrl-th
4
The categories of this paper are: cond-mat
14
The categories of this paper are: math-ph
26
The categories of this paper are: bayes-an
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The categories of this paper are: eess
18
The categories of this paper are: econ
27
The categories of this paper are: comp-gas
15
The categories of this paper are: nucl-ex