Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Methanol and its relation to the water snowline in the disk around the
  young outbursting star V883 Ori   We report the detection of methanol in the disk around the young outbursting
star V883 Ori with the Atacama Large Millimeter/submillimeter Array (ALMA).
Four transitions are observed with upper level energies ranging between 115 and
459 K. The emission is spatially resolved with the 0.14" beam and follows the
Keplerian rotation previously observed for C$^{18}$O. Using a rotational
diagram analysis, we find a disk-averaged column density of $\sim10^{17}$
cm$^{-2}$ and a rotational temperature of $\sim90-100$ K, suggesting that the
methanol has thermally desorbed from the dust grains. We derive outer radii
between 120 and 140 AU for the different transitions, compared to the 360 AU
outer radius for C$^{18}$O. Depending on the exact physical structure of the
disk, the methanol emission could originate in the surface layers beyond the
water snowline. Alternatively, the bulk of the methanol emission originates
inside the water snowline, which can then be as far out as ~100 AU, instead of
42 AU as was previously inferred from the continuum opacity. In addition, these
results show that outbursting young stars like V883 Ori are good sources to
study the ice composition of planet forming material through thermally desorbed
complex molecules, which have proven to be hard to observe in more evolved
protoplanetary disks.

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The categories of this paper are: q-fin
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The categories of this paper are: quant-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: hep-lat
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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: solv-int
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The categories of this paper are: math-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: stat
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The categories of this paper are: adap-org
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The categories of this paper are: nlin
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The categories of this paper are: hep-th
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The categories of this paper are: bayes-an
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The categories of this paper are: q-bio
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The categories of this paper are: ao-sci