Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Ejecta cloud from the AIDA space project kinetic impact on the secondary
  of a binary asteroid: II. fates and evolutionary dependencies   This paper presents a quantitative study of the evolution of the ejecta cloud
released from a hypervelocity impact on a binary asteroid. We performed
numerical simulations of the post-impact dynamics of the ejecta cloud in the
framework of the current mission scenario of AIDA mission project. A grid
search of launching sites of ejecta was defined over the globe of Didymoon, and
considering a wide range of possible ejection speeds, we determined the
dependency of ejecta fate on launching sites (projectile impact sites) and
speeds. This range allows us to track all the complex cases that include
different types of dynamical fates. Two major mechanisms are found to be
working broadly during the post-ejection evolution of the ejecta cloud: 1)
ejecta on mean motion resonance orbits with Didymoon produce long-term
quasi-periodic showers onto Didymoon over at least a couple of weeks after the
projectile impact, 2) ejecta on non-resonant orbits produce a rapid and high
re-accretion flux. This rapid and high flux occurs just once because ejecta on
such orbits leave the system unless they experience a collision during their
first encounter. For the second part of this study, we performed full-scale
simulations of the ejecta cloud released from 6 hypothetical impact sites. We
considered two kinds of material composing Didymoon's subsurface and then
combined a power-law size distribution of the ejecta with an ejection speed
distribution. We find that the ejecta cloud evolution can be divided in two
periods. It starts with a first violent period (<10 hr) with fast re-accretion
or ejection from the system. A second period is found to be more sensitive to
the launching site than the first one. During this second period, ejecta will
either re-accrete or being ejected from the system, depending both on their
sizes and on their average survival time in close proximity of the binary
components.

36
The categories of this paper are: cmp-lg
23
The categories of this paper are: solv-int
27
The categories of this paper are: comp-gas
22
The categories of this paper are: chao-dyn
28
The categories of this paper are: alg-geom
37
The categories of this paper are: supr-con
34
The categories of this paper are: chem-ph
15
The categories of this paper are: nucl-ex
16
The categories of this paper are: stat
29
The categories of this paper are: funct-an
35
The categories of this paper are: mtrl-th
24
The categories of this paper are: dg-ga
10
The categories of this paper are: q-bio
3
The categories of this paper are: physics
33
The categories of this paper are: plasm-ph
31
The categories of this paper are: ao-sci