Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Chemical signatures of a warped protoplanetary disc   Circumstellar discs may become warped or broken into distinct planes if there
is a stellar or planetary companion with an orbit that is misaligned with
respect to the disc. There is mounting observational evidence for
protoplanetary discs with misaligned inner discs and warps that may be caused
by such interactions with a previously undetected companion, giving us a
tantalising indication of possible planets forming there. Hydrodynamical and
radiative transfer models indicate that the temperature varies azimuthally in
warped discs due to the variable angle at which the disc surface faces the star
and this impacts the disc chemistry. We perform chemical modelling based on a
hydrodynamical model of a protoplanetary disc with an embedded planet orbiting
at a 12$^{\circ}$ inclination to the disc. Even for this small misalignment,
abundances of species including CO and HCO$^+$ vary azimuthally and this
results in detectable azimuthal variations in submillimetre line emission.
Azimuthal variations in line emission may therefore indicate the presence of an
unseen embedded companion. Nonaxisymmetric chemical abundances should be
considered when interpreting molecular line maps of warped or shadowed
protoplanetary discs.

16
The categories of this paper are: stat
7
The categories of this paper are: hep-th
31
The categories of this paper are: ao-sci
34
The categories of this paper are: chem-ph
19
The categories of this paper are: eess
20
The categories of this paper are: acc-phys
37
The categories of this paper are: supr-con
22
The categories of this paper are: chao-dyn
4
The categories of this paper are: cond-mat
17
The categories of this paper are: q-fin
26
The categories of this paper are: bayes-an
10
The categories of this paper are: q-bio
13
The categories of this paper are: quant-ph
27
The categories of this paper are: comp-gas
33
The categories of this paper are: plasm-ph
11
The categories of this paper are: hep-lat