Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Atmospheric escape from the TRAPPIST-1 planets and implications for
  habitability   The presence of an atmosphere over sufficiently long timescales is widely
perceived as one of the most prominent criteria associated with planetary
surface habitability. We address the crucial question as to whether the seven
Earth-sized planets transiting the recently discovered ultracool dwarf star
TRAPPIST-1 are capable of retaining their atmospheres. To this effect, we carry
out numerical simulations to characterize the stellar wind of TRAPPIST-1 and
the atmospheric ion escape rates for all the seven planets. We also estimate
the escape rates analytically and demonstrate that they are in good agreement
with the numerical results. We conclude that the outer planets of the
TRAPPIST-1 system are capable of retaining their atmospheres over billion-year
timescales. The consequences arising from our results are also explored in the
context of abiogenesis, biodiversity, and searches for future exoplanets. In
light of the many unknowns and assumptions involved, we recommend that these
conclusions must be interpreted with due caution.

24
The categories of this paper are: dg-ga
22
The categories of this paper are: chao-dyn
21
The categories of this paper are: adap-org
19
The categories of this paper are: eess
11
The categories of this paper are: hep-lat
0
The categories of this paper are: hep-ph
9
The categories of this paper are: nlin
20
The categories of this paper are: acc-phys
25
The categories of this paper are: patt-sol
1
The categories of this paper are: cs
33
The categories of this paper are: plasm-ph
30
The categories of this paper are: q-alg
15
The categories of this paper are: nucl-ex
28
The categories of this paper are: alg-geom
4
The categories of this paper are: cond-mat
26
The categories of this paper are: bayes-an