Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Metal enrichment leads to low atmospheric C/O ratios in transiting giant
  exoplanets   We predict the carbon-to-oxygen (C/O) ratios in the hydrogen-helium envelope
and atmospheres of a sample of nearly 50 relatively cool ($T_{\mathrm eq}<$
1000 K) transiting gas giant planets. The method involves planetary envelope
metallicity estimates that use the structure models of Thorngren et al. (2016)
and the disk and planetary accretion model of \"Oberg et al. (2011). We find
that nearly all of these planets are strongly metal-enriched which, coupled
with the fact that solid material is the main deliverer of metals in the
protoplanetary disk, implies that the substellar C/O ratios of their accreted
solid material dominate compared to the enhanced C/O ratio of their accreted
gaseous component. We predict that these planets will have atmospheres that are
typically reduced in their C/O compared to parent star values independent of
the assessed formation locations, with C/O $<1$ a nearly universal outcome
within the framework of the model. We expect water vapor absorption features to
be ubiquitous in the atmospheres of these planets, and by extension, other gas
giants.

17
The categories of this paper are: q-fin
25
The categories of this paper are: patt-sol
18
The categories of this paper are: econ
5
The categories of this paper are: gr-qc
19
The categories of this paper are: eess
20
The categories of this paper are: acc-phys
27
The categories of this paper are: comp-gas
10
The categories of this paper are: q-bio
30
The categories of this paper are: q-alg
9
The categories of this paper are: nlin
3
The categories of this paper are: physics
12
The categories of this paper are: nucl-th
8
The categories of this paper are: hep-ex
13
The categories of this paper are: quant-ph
37
The categories of this paper are: supr-con
26
The categories of this paper are: bayes-an