Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Transiting planets as a precision clock to constrain the time variation
  of the gravitational constant   Analysis of transit times in exoplanetary systems accurately provides an
instantaneous orbital period, $P(t)$, of their member planets. A long-term
monitoring of those transiting planetary systems puts limits on the variability
of $P(t)$, which are translated into the constraints on the time variation of
the gravitational constant $G$. We apply this analysis to $10$ transiting
systems observed by the Kepler spacecraft, and find that $\Delta G/G\lesssim
5\times10^{-6}$ for 2009-2013, or $\dot{G}/G \lesssim
10^{-6}\,\mathrm{yr}^{-1}$ if $\dot{G}$ is constant. While the derived limit is
weaker than those from other analyses, it is complementary to them and can be
improved by analyzing numerous transiting systems that are continuously
monitored.

37
The categories of this paper are: supr-con
31
The categories of this paper are: ao-sci
7
The categories of this paper are: hep-th
15
The categories of this paper are: nucl-ex
25
The categories of this paper are: patt-sol
10
The categories of this paper are: q-bio
29
The categories of this paper are: funct-an
35
The categories of this paper are: mtrl-th
2
The categories of this paper are: math
36
The categories of this paper are: cmp-lg
21
The categories of this paper are: adap-org
0
The categories of this paper are: hep-ph
20
The categories of this paper are: acc-phys
9
The categories of this paper are: nlin
19
The categories of this paper are: eess
30
The categories of this paper are: q-alg