Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: An asteroseismic view of the radius valley: stripped cores, not born
  rocky   Various theoretical models treating the effect of stellar irradiation on
planetary envelopes predict the presence of a radius valley: i.e. a bimodal
distribution of planet radii, with super-Earths and sub-Neptune planets
separated by a valley at around $\approx 2~R_\oplus$. Such a valley was
observed recently, owing to an improvement in the precision of stellar, and
therefore planetary radii. Here we investigate the presence, location and shape
of such a valley using a small sample with highly accurate stellar parameters
determined from asteroseismology, which includes 117 planets with a median
uncertainty on the radius of 3.3%. We detect a clear bimodal distribution, with
super-Earths ($\approx 1.5~R_\oplus$) and sub-Neptunes ($\approx 2.5~R_\oplus$)
separated by a deficiency around $2~R_\oplus$. We furthermore characterize the
slope of the valley as a power law $R \propto P^\gamma$ with $\gamma =
{-0.09^{+0.02}_{-0.04}}$. A negative slope is consistent with models of
photo-evaporation, but not with the late formation of rocky planets in a
gas-poor environment, which would lead to a slope of opposite sign. The exact
location of the gap further points to planet cores consisting of a significant
fraction of rocky material.

27
The categories of this paper are: comp-gas
4
The categories of this paper are: cond-mat
36
The categories of this paper are: cmp-lg
20
The categories of this paper are: acc-phys
26
The categories of this paper are: bayes-an
23
The categories of this paper are: solv-int
3
The categories of this paper are: physics
35
The categories of this paper are: mtrl-th
18
The categories of this paper are: econ
37
The categories of this paper are: supr-con
13
The categories of this paper are: quant-ph
15
The categories of this paper are: nucl-ex
1
The categories of this paper are: cs
31
The categories of this paper are: ao-sci
24
The categories of this paper are: dg-ga
29
The categories of this paper are: funct-an