Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Mass-Radius Relationships for Exoplanets II: Grueneisen Equation of
  State for Ammonia   We describe a mechanical equation of state for NH3, based on shock wave
measurements for liquid ammonia. The shock measurements, for an initial
temperature of 203 K, extended to 1.54 g/cc and 38.6 GPa. The shock and
particle speeds were fitted well with a straight line, so extrapolations to
higher compressions are numerically stable, but the accuracy is undetermined
outside the range of the data. The isentrope through the same initial state was
estimated, along with its sensitivity to the Grueneisen parameter. Mass-radius
relations were calculated for self-gravitating bodies of pure ammonia, and for
differentiated ammonia-rock bodies. The relations were insensitive to
variations in the Grueneisen parameter, indicating that they should be accurate
for studies of planetary structure.

31
The categories of this paper are: ao-sci
24
The categories of this paper are: dg-ga
28
The categories of this paper are: alg-geom
12
The categories of this paper are: nucl-th
21
The categories of this paper are: adap-org
0
The categories of this paper are: hep-ph
37
The categories of this paper are: supr-con
30
The categories of this paper are: q-alg
18
The categories of this paper are: econ
34
The categories of this paper are: chem-ph
25
The categories of this paper are: patt-sol
7
The categories of this paper are: hep-th
35
The categories of this paper are: mtrl-th
32
The categories of this paper are: atom-ph
17
The categories of this paper are: q-fin
16
The categories of this paper are: stat