Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Validation and Initial Characterization of the Long Period Planet
  Kepler-1654 b   Fewer than 20 transiting Kepler planets have periods longer than one year.
Our early search of the Kepler light curves revealed one such system,
Kepler-1654 b (originally KIC~8410697b), which shows exactly two transit events
and whose second transit occurred only 5 days before the failure of the second
of two reaction wheels brought the primary Kepler mission to an end. A number
of authors have also examined light curves from the Kepler mission searching
for long period planets and identified this candidate. Starting in Sept. 2014
we began an observational program of imaging, reconnaissance spectroscopy and
precision radial velocity measurements which confirm with a high degree of
confidence that Kepler-1654 b is a {\it bona fide} transiting planet orbiting a
mature G2V star (T$_{eff}= 5580$K, [Fe/H]=-0.08) with a semi-major axis of 2.03
AU, a period of 1047.84 days and a radius of 0.82$\pm$0.02 R$_{Jup}$. Radial
Velocity (RV) measurements using Keck's HIRES spectrometer obtained over 2.5
years set a limit to the planet's mass of $<0.5\ (3\sigma$) M$_{Jup}$. The bulk
density of the planet is similar to that of Saturn or possibly lower. We assess
the suitability of temperate gas giants like Kepler-1654b for transit
spectroscopy with the James Webb Space Telescope since their relatively cold
equilibrium temperatures (T$_{pl}\sim 200$K) make them interesting from the
standpoint of exo-planet atmospheric physics. Unfortunately, these low
temperatures also make the atmospheric scale heights small and thus
transmission spectroscopy challenging. Finally, the long time between transits
can make scheduling JWST observations difficult---as is the case with
Kepler-1654b.

3
The categories of this paper are: physics
25
The categories of this paper are: patt-sol
34
The categories of this paper are: chem-ph
5
The categories of this paper are: gr-qc
22
The categories of this paper are: chao-dyn
16
The categories of this paper are: stat
36
The categories of this paper are: cmp-lg
8
The categories of this paper are: hep-ex
32
The categories of this paper are: atom-ph
24
The categories of this paper are: dg-ga
9
The categories of this paper are: nlin
12
The categories of this paper are: nucl-th
17
The categories of this paper are: q-fin
26
The categories of this paper are: bayes-an
28
The categories of this paper are: alg-geom
37
The categories of this paper are: supr-con