Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Ice-Coated Pebble Drift as a Possible Explanation for Peculiar Cometary
  CO/H2O Ratios   To date, at least three comets -- 2I/Borisov, C/2016 R2 (PanSTARRS), and
C/2009 P1 (Garradd) -- have been observed to have unusually high CO
concentrations compared to water. We attempt to explain these observations by
modeling the effect of drifting solid (ice and dust) material on the ice
compositions in protoplanetary disks. We find that, independent of the exact
disk model parameters, we always obtain a region of enhanced ice-phase CO/H2O
that spreads out in radius over time. The inner edge of this feature coincides
with the CO snowline. Almost every model achieves at least CO/H2O of unity, and
one model reaches a CO/H2O ratio > 10. After running our simulations for 1 Myr,
an average of 40% of the disk ice mass contains more CO than H2O ice. In light
of this, a population of CO ice enhanced planetesimals are likely to generally
form in the outer regions of disks, and we speculate that the aforementioned
CO-rich comets may be more common, both in our own Solar System and in
extrasolar systems, than previously expected.

22
The categories of this paper are: chao-dyn
14
The categories of this paper are: math-ph
16
The categories of this paper are: stat
37
The categories of this paper are: supr-con
17
The categories of this paper are: q-fin
12
The categories of this paper are: nucl-th
20
The categories of this paper are: acc-phys
27
The categories of this paper are: comp-gas
31
The categories of this paper are: ao-sci
0
The categories of this paper are: hep-ph
21
The categories of this paper are: adap-org
32
The categories of this paper are: atom-ph
10
The categories of this paper are: q-bio
34
The categories of this paper are: chem-ph
35
The categories of this paper are: mtrl-th
7
The categories of this paper are: hep-th