Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: EPIC201702477b: A Long Period Transiting Brown Dwarf from K2   We report the discovery of EPIC201702477b, a transiting brown dwarf in a long
period (40.73691 +/- 0.00037 day) and eccentric (e=0.2281 +/- 0.0026) orbit.
This system was initially reported as a planetary candidate based on two
transit events seen in K2 Campaign 1 photometry and later validated as an
exoplanet. We confirm the transit and refine the ephemeris with two subsequent
ground-based detections of the transit using the LCOGT 1m telescope network. We
rule out any transit timing variations above the level of 30s. Using high
precision radial velocity measurements from HARPS and SOPHIE we identify the
transiting companion as a brown dwarf with a mass, radius, and bulk density of
66.9 +/- 1.7 M$_J$, 0.757 +/- 0.065 R$_J$, and 191+/-51 g.cm$^{-3}$
respectively. EPIC201702477b is the smallest radius brown dwarf yet discovered,
with a mass just below the H-burning limit. It has the highest density of any
planet, substellar mass object or main-sequence star discovered so far. We find
evidence in the set of known transiting brown dwarfs for two populations of
objects - high mass brown dwarfs and low mass brown dwarfs. The higher-mass
population have radii in very close agreement to theoretical models, and show a
lower-mass limit around 60 M$_J$. This may be the signature of mass-dependent
ejection of systems during the formation process.

36
The categories of this paper are: cmp-lg
7
The categories of this paper are: hep-th
33
The categories of this paper are: plasm-ph
28
The categories of this paper are: alg-geom
1
The categories of this paper are: cs
18
The categories of this paper are: econ
37
The categories of this paper are: supr-con
10
The categories of this paper are: q-bio
26
The categories of this paper are: bayes-an
35
The categories of this paper are: mtrl-th
12
The categories of this paper are: nucl-th
9
The categories of this paper are: nlin
14
The categories of this paper are: math-ph
5
The categories of this paper are: gr-qc
13
The categories of this paper are: quant-ph
4
The categories of this paper are: cond-mat