Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The impact of pre-main sequence stellar evolution on midplane snowline
  locations and C/O in planet forming discs   We investigate the impact of pre-main sequence stellar luminosity evolution
on the thermal and chemical properties of disc midplanes. We create template
disc models exemplifying initial conditions for giant planet formation for a
variety of stellar masses and ages. These models include the 2D physical
structure of gas as well as 1D chemical structure in the disc midplane. The
disc temperature profiles are calculated using fully physically consistent
radiative transfer models for stars between 0.5 and 3 Msun and ages up to 10
Myr. The resulting temperature profiles are used to determine how the chemical
conditions in the mid-plane change over time. We therefore obtain gas and
ice-phase abundances of the main carbon and oxygen carrier species. While the
temperature profiles produced are not markedly different for the stars of
different masses at early stages (<1 Myr), they start to diverge significantly
beyond 2 Myr. Discs around stars with mass >1.5 Msun become warmer over time as
the stellar luminosity increases, whereas low-mass stars decrease in luminosity
leading to cooler discs. This has an observable effect on the location of the
CO snowline, which is located >200 au in most models for a 3 Msun star, but is
always within 80 au for 0.5 Msun star. The chemical compositions calculated
show that a well defined stellar mass and age range exists in which high C/O
gas giants can form. In the case of the exoplanet HR8799b, our models show it
must have formed before the star was 1 Myr old.

11
The categories of this paper are: hep-lat
35
The categories of this paper are: mtrl-th
29
The categories of this paper are: funct-an
7
The categories of this paper are: hep-th
20
The categories of this paper are: acc-phys
27
The categories of this paper are: comp-gas
12
The categories of this paper are: nucl-th
15
The categories of this paper are: nucl-ex
9
The categories of this paper are: nlin
33
The categories of this paper are: plasm-ph
21
The categories of this paper are: adap-org
32
The categories of this paper are: atom-ph
26
The categories of this paper are: bayes-an
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The categories of this paper are: q-fin
3
The categories of this paper are: physics
34
The categories of this paper are: chem-ph