Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Lightning and charge processes in brown dwarf and exoplanet atmospheres   The study of the composition of brown dwarf atmospheres helped to understand
their formation and evolution. Similarly, the study of exoplanet atmospheres is
expected to constrain their formation and evolutionary states. We use results
from 3D simulations, kinetic cloud formation and kinetic ion-neutral chemistry
to investigate ionisation processes which will affect their atmosphere
chemistry: The dayside of super-hot Jupiters is dominated by atomic hydrogen,
and not H$_2$O. Such planetary atmospheres exhibit a substantial degree of
thermal ionisation and clouds only form on the nightside where lightning leaves
chemical tracers (e.g. HCN) for possibly long enough to be detectable. External
radiation may cause exoplanets to be enshrouded in a shell of highly ionised,
H$_3^+$-forming gas and a weather-driven aurora may emerge. Brown dwarfs enable
us to study the role of electron beams for the emergence of an extrasolar,
weather-system driven aurora-like chemistry, and the effect of strong magnetic
fields on cold atmospheric gases. Electron beams trigger the formation of
H$_3^+$ in the upper atmosphere of a brown dwarf (e.g. LSR-J1835) which may
react with it to form hydronium, H$_3$O$^+$, as a longer lived chemical tracer.
Brown dwarfs and super-hot gas giants may be excellent candidates to search for
H$_3$O$^+$ as an H$_3^+$ product.

25
The categories of this paper are: patt-sol
24
The categories of this paper are: dg-ga
22
The categories of this paper are: chao-dyn
16
The categories of this paper are: stat
11
The categories of this paper are: hep-lat
35
The categories of this paper are: mtrl-th
0
The categories of this paper are: hep-ph
14
The categories of this paper are: math-ph
7
The categories of this paper are: hep-th
37
The categories of this paper are: supr-con
31
The categories of this paper are: ao-sci
27
The categories of this paper are: comp-gas
1
The categories of this paper are: cs
33
The categories of this paper are: plasm-ph
13
The categories of this paper are: quant-ph
15
The categories of this paper are: nucl-ex