Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: An M Dwarf Companion and Its Induced Spiral Arms in the HD 100453
  Protoplanetary Disk   Recent VLT/SPHERE near-infrared imaging observations revealed two spiral arms
with a near m=2 rotational symmetry in the protoplanetary disk around the ~1.7
solar mass Herbig star HD 100453. A ~0.3 solar mass M dwarf companion, HD
100453 B, was also identified at a projected separation of 120 AU from the
primary. In this Letter, we carry out hydrodynamic and radiative transfer
simulations to examine the scattered light morphology of the HD 100453 disk as
perturbed by the companion on a circular and coplanar orbit. We find that the
companion truncates the disk at ~45 AU in scattered light images, and excites
two spiral arms in the remaining (circumprimary) disk with a near m=2
rotational symmetry. Both the truncated disk size and the morphology of the
spirals are in excellent agreement with the SPHERE observations at Y , J, H,
and K1-bands, suggesting that the M dwarf companion is indeed responsible for
the observed double-spiral-arm pattern. Our model suggests that the disk is
close to face on (inclination angle ~5 degree), and that the entire
disk-companion system rotates counterclockwise on the sky. The HD 100453
observations, along with our modeling work, demonstrate that double spiral arm
patterns in near-infrared scattered light images can be generically produced by
companions, and support future observations to identify the companions
responsible for the arms observed in the MWC 758 and SAO 206462 systems.

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The categories of this paper are: patt-sol
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The categories of this paper are: econ
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The categories of this paper are: bayes-an
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The categories of this paper are: ao-sci
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The categories of this paper are: alg-geom
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The categories of this paper are: nucl-th
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The categories of this paper are: cmp-lg
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The categories of this paper are: hep-ex
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The categories of this paper are: hep-lat
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The categories of this paper are: quant-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: hep-ph
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The categories of this paper are: nlin
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The categories of this paper are: cs
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The categories of this paper are: dg-ga
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The categories of this paper are: plasm-ph