Outgassing of ice agglomerates II
Icarus,
Journal Year:
2025,
Volume and Issue:
unknown, P. 116541 - 116541
Published: March 1, 2025
Language: Английский
Comparison of a pebbles-based model with the observed evolution of the water and carbon dioxide outgassing of comet 67P/Churyumov-Gerasimenko
Monthly Notices of the Royal Astronomical Society,
Journal Year:
2023,
Volume and Issue:
523(4), P. 5841 - 5852
Published: June 15, 2023
ABSTRACT
The
Rosetta
mission
escorted
comet
67P/Churyumov-Gerasimenko
for
approximately
two
years
including
the
perihelion
passage
(1.24
au,
2015
August),
allowing
us
to
monitor
seasonal
evolution
of
water
and
carbon
dioxide
loss
rates.
Here,
we
model
production
as
measured
by
Rosina
experiment
during
entire
escort
phase
applying
Water-ice-Enriched
Block
(WEB)
model,
namely
a
structural
activity
nucleus
made
pebbles.
Furthermore,
compare
surface
temperature
distribution
inferred
VIRTIS-M
observations
in
2014
August
(≈3.5
au
inbound,
northern
summer)
with
expected
temperatures
from
our
simulations
nucleus’
hemisphere,
investigating
relevance
self-illumination
effects
‘neck’
assessing
active
area
extent
summer.
Our
imply
that:
(1)
at
is
mostly
dehydration
water-poor
pebbles,
continuously
exposed
CO2-driven
erosion;
(2)
large
heliocentric
distances
outbound
rate
dominated
self-cleaning
fallout
deposits;
(3)
steep
decrease
curve
distance
results
progressive
reduction
water-active
area,
predicted
proposed
model;
(4)
distributed
sources,
originating
‘neck’;
(5)
sources
water-ice-rich
exposures
dominate
up
inbound
equinox;
(6)
time
CO2
consistent
WEB
model.
Language: Английский
Ejection of porous dust–ice agglomerates from the surface of the cometary nucleus
Icarus,
Journal Year:
2023,
Volume and Issue:
411, P. 115937 - 115937
Published: Dec. 30, 2023
Language: Английский
Production of water from a dynamically new comet
Monthly Notices of the Royal Astronomical Society,
Journal Year:
2023,
Volume and Issue:
526(3), P. 4484 - 4489
Published: Oct. 4, 2023
ABSTRACT
In
our
paper,
we
presented
the
results
of
numerical
simulations
dealing
with
production
water
from
nucleus
a
hypothetical
dynamically
new
comet.
The
were
performed
using
empirical
equation
based
on
laboratory
experiments
in
vacuum
ice
agglomerates.
We
also
obtained
simple,
popular
approach.
model
is
prolate
ellipsoid
rough
surface.
compared
observed
comet
C/2012
K1
PanSTARRS.
Our
indicate,
that
can
be
reproduced
without
assuming
presence
highly
volatile
ices
when
dust
may
slide
down
slopes
and
thermal
conductivity
very
low.
Language: Английский