Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Habitable-Zone Earth-Sized Planet Rescued from False Positive Status   We report the discovery of an Earth-sized planet in the habitable zone of a
low-mass star called Kepler-1649. The planet, Kepler-1649 c, is
1.06$^{+0.15}_{-0.10}$ times the size of Earth and transits its 0.1977 +/-
0.0051 Msun mid M-dwarf host star every 19.5 days. It receives 74 +/- 3 % the
incident flux of Earth, giving it an equilibrium temperature of 234 +/- 20K and
placing it firmly inside the circumstellar habitable zone. Kepler-1649 also
hosts a previously-known inner planet that orbits every 8.7 days and is roughly
equivalent to Venus in size and incident flux. Kepler-1649 c was originally
classified as a false positive by the Kepler pipeline, but was rescued as part
of a systematic visual inspection of all automatically dispositioned Kepler
false positives. This discovery highlights the value of human inspection of
planet candidates even as automated techniques improve, and hints that
terrestrial planets around mid to late M-dwarfs may be more common than those
around more massive stars.

18
The categories of this paper are: econ
10
The categories of this paper are: q-bio
33
The categories of this paper are: plasm-ph
23
The categories of this paper are: solv-int
26
The categories of this paper are: bayes-an
36
The categories of this paper are: cmp-lg
29
The categories of this paper are: funct-an
20
The categories of this paper are: acc-phys
15
The categories of this paper are: nucl-ex
11
The categories of this paper are: hep-lat
7
The categories of this paper are: hep-th
24
The categories of this paper are: dg-ga
9
The categories of this paper are: nlin
30
The categories of this paper are: q-alg
27
The categories of this paper are: comp-gas
16
The categories of this paper are: stat