Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: An Optical/near-infrared investigation of HD 100546 b with the Gemini
  Planet Imager and MagAO   We present H band spectroscopic and Halpha photometric observations of HD
100546 obtained with GPI and MagAO. We detect H band emission at the location
of the protoplanet HD 100546b, but show that choice of data processing
parameters strongly affects the morphology of this source. It appears
point-like in some aggressive reductions, but rejoins an extended disk
structure in the majority of the others. Furthermore, we demonstrate that this
emission appears stationary on a timescale of 4.6 yrs, inconsistent at the
2sigma level with a Keplerian clockwise orbit at 59 au in the disk plane. The H
band spectrum of the emission is inconsistent with any type of low effective
temperature object or accreting protoplanetary disk. It strongly suggests a
scattered light origin, as it is consistent with the spectrum of the star and
the spectra extracted at other locations in the disk. A non detection at the
5sigma level of HD 100546b in differential Halpha imaging places an upper
limit, assuming the protoplanet lies in a gap free of extinction, on the
accretion luminosity and accretion rate of 1.7E-4 Lsun and
MMdot<6.4E-7Mjup^2/yr for 1Rjup. These limits are comparable to the accretion
luminosity and rate of TTauri-stars or LkCa 15b. Taken together, these lines of
evidence suggest that the H band source at the location of HD 100546b is not
emitted by a planetary photosphere or an accreting circumplanetary disk but is
a disk feature enhanced by the PSF subtraction process. This non-detection is
consistent with the non-detection in the K band reported in an earlier study
but does not exclude the possibility that HD 100546b is deeply embedded.

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The categories of this paper are: bayes-an
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The categories of this paper are: q-alg
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The categories of this paper are: cond-mat
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The categories of this paper are: supr-con
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The categories of this paper are: solv-int
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The categories of this paper are: patt-sol
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The categories of this paper are: mtrl-th
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The categories of this paper are: gr-qc
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The categories of this paper are: econ
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The categories of this paper are: cmp-lg
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The categories of this paper are: nlin
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The categories of this paper are: dg-ga
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The categories of this paper are: cs
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The categories of this paper are: hep-th
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The categories of this paper are: adap-org
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The categories of this paper are: ao-sci