Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Cyanogen, cyanoacetylene, and acetonitrile in comet 67P and their
  relationship to the cyano radical   The cyano radical (CN) is one of the most frequently remotely observed
species in space, also in comets. Data from the high-resolution Double Focusing
Mass Spectrometer (DFMS) on board the Rosetta orbiter, collected in the inner
coma of comet 67P/Churyumov-Gerasimenko, revealed an unexpected chemical
complexity, and, recently, also more CN than expected from photodissociation of
its most likely parent hydrogen cyanide (HCN). This work is dedicated to the
derivation of abundances relative to HCN of three cometary nitriles (including
structural isomers) from DFMS data. Mass spectrometry of complex mixtures does
not always allow distinction of structural isomers. We assumed the most stable
and most abundant (in similar environments) structure in our analysis, that is
HCN for CHN, CH3CN for C2H3N, HC3N for C3HN, and NCCN for C2N2. For
cyanoacetylene (HC3N) and acetonitrile (CH3CN) the complete mission timeline
was evaluated, while cyanogen (NCCN) often was below detection limit. By
carefully selecting periods where cyanogen was above detection limit, we were
able to follow the abundance ratio between NCCN and HCN from 3.16 au inbound to
3.42 au outbound. These are the first measurements of NCCN in a comet.We find
that neither NCCN, nor any of the other two nitriles, is sufficiently abundant
to be a relevant alternative parent to CN.

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The categories of this paper are: solv-int
35
The categories of this paper are: mtrl-th
37
The categories of this paper are: supr-con
10
The categories of this paper are: q-bio
22
The categories of this paper are: chao-dyn
17
The categories of this paper are: q-fin
9
The categories of this paper are: nlin
31
The categories of this paper are: ao-sci
4
The categories of this paper are: cond-mat
25
The categories of this paper are: patt-sol
20
The categories of this paper are: acc-phys
15
The categories of this paper are: nucl-ex
2
The categories of this paper are: math
5
The categories of this paper are: gr-qc
16
The categories of this paper are: stat
11
The categories of this paper are: hep-lat