Super-Earths and Earth-like exoplanets
Elsevier eBooks,
Год журнала:
2024,
Номер
unknown, С. 51 - 112
Опубликована: Авг. 29, 2024
Язык: Английский
Potential Interior Structures and Habitability of Super-Earth Exoplanets LHS 1140 b, K2-18 b, TOI-1452 b, and TOI-1468 c
The Astrophysical Journal,
Год журнала:
2025,
Номер
979(2), С. 158 - 158
Опубликована: Янв. 23, 2025
Abstract
We
analyze
four
super-Earth
exoplanets,
LHS
1140
b,
K2-18
TOI-1452
and
TOI-1468
c,
which
orbit
M
dwarf
stars
in
the
habitable
zone.
Their
relative
proximity,
within
40
pc,
makes
them
prime
candidates
for
follow-up
observations
atmospheric
habitability
studies.
This
paper
aims
to
assess
their
internal
structure
habitability,
considering
tidal
heating,
global
transport.
model
interior
of
planets
by
applying
Bayesian
inference
an
exoplanet's
model.
A
with
constant
quality
factor
is
used
calculate
range
a
one-dimensional
analytical
tidally
locked
surface
temperature
distribution
habitability.
Assuming
no
or
only
thin
atmospheres,
b
c
are
likely
be
water
worlds.
However,
may
have
rocky
surfaces.
find
that
heating
not
enough
raise
mean
temperature,
but
greenhouse
can
effectively
do
so.
If
considered
retained
thick
may,
significant
heat
transport
factors,
too
hot
sustain
liquid
on
lower
instellation
nonzero
probability
it
having
give
more
space
conditions
planet.
Язык: Английский
Prolonged Fluvial Activity Revealed by Mapping and Analyses of Valley Networks in the Northwestern Hellas Region, Mars
Journal of Geophysical Research Planets,
Год журнала:
2024,
Номер
129(12)
Опубликована: Ноя. 30, 2024
Abstract
Valley
networks
(VNs)
on
Mars
are
crucial
for
understanding
the
Martian
hydrologic
and
climatic
history.
However,
limited
resolution
of
remote
sensing
data
hindered
complete
identification
VNs,
affecting
our
formation
duration
VNs
as
well
their
significance.
In
this
study,
we
utilized
high‐resolution
imaging
topographic
to
conduct
detailed
mapping
investigations
around
northwestern
margin
Hellas
basin,
largest
impact
basin
major
sedimentary
sink
in
southern
highlands.
We
identified
a
total
911
with
cumulative
length
32,086.3
km,
more
than
twice
that
previous
results.
Additionally,
analyzed
morphological
parameters
including
stream
order,
sinuosity,
junction
angle,
slope,
etc.,
investigated
geomorphologic
characteristics,
determined
ages.
propose
occasional
precipitation
regional
groundwater
fostered
well‐developed
“Hellas
Ocean”
Noachian
Period.
The
main
fluvial
activity
occurred
during
∼3.9–3.2
Ga.
Subsequently,
climate
transitioned
from
warm
semiarid
cold
arid
Noachian‐Hesperian
transition,
leading
evaporation
Ocean.”
Amazonian,
some
small
simple
valleys
formed
∼2.1–1.0
Ga
supply
meltwater
associated
obliquity‐controlled
glacial
processes.
These
results
reveal
prolonged
region
diverse
water
sources
under
changing
conditions,
which
make
very
promising
candidate
future
situ
exploration
missions.
Язык: Английский
Convective shutdown in the atmospheres of lava worlds
Monthly Notices of the Royal Astronomical Society,
Год журнала:
2024,
Номер
unknown
Опубликована: Дек. 17, 2024
Abstract
Atmospheric
energy
transport
is
central
to
the
cooling
of
primordial
magma
oceans.
Theoretical
studies
atmospheres
on
lava
planets
have
assumed
that
convection
only
process
involved
in
setting
atmospheric
temperature
structure.
This
significantly
influences
ability
for
a
ocean
cool.
It
has
been
suggested
convective
stability
these
could
preclude
permanent
We
develop
new
1D
radiative-convective
model
order
investigate
when
overlying
oceans
are
convectively
stable.
Using
coupled
interior-atmosphere
framework,
we
simulate
early
evolution
two
terrestrial-mass
exoplanets:
TRAPPIST-1
c
and
HD
63433
d.
Our
simulations
suggest
atmosphere
d
exhibits
deep
isothermal
layers
which
However,
it
able
maintain
an
depleted
H2O.
possible
underneath
without
convection.
Absorption
features
CO2
SO2
within
synthetic
emission
spectra
associated
with
mantle
redox
state,
meaning
future
observations
may
provide
constraints
geochemical
properties
analogous
Earth.
Simulations
indicate
expected
solidified
100
Myr
outgassing
thick
process.
Cool
stratospheres
generated
by
low
molecular-weight
can
mimic
atmosphere-less
body.
Future
work
should
consider
how
escape
chemistry
modulates
lifetime
oceans,
role
tidal
heating
sustaining
Язык: Английский
Venus
Elsevier eBooks,
Год журнала:
2024,
Номер
unknown, С. 289 - 323
Опубликована: Авг. 29, 2024
Sorting and Weathering Trends of Soil at Gale Crater, Mars: Implications for Regional Pedological Processes
Journal of Geophysical Research Planets,
Год журнала:
2024,
Номер
129(12)
Опубликована: Ноя. 29, 2024
Abstract
Detailed
soil
characterization
at
Gale
crater
based
on
in
situ
observations
has
revealed
compositional
trends
within
soils,
while
the
physical
and
chemical
processes
underlying
remain
to
be
evaluated.
Here
we
use
grain‐morphometrical
geochemical
across
Wentworth‐classes
of
48
targets
evaluate
pedological
potential
weathering
signatures.
The
concentration
olivine
minerals
∼250
∼500
μm
size
range
indicates
prevalence
heavy
mineral
sorting
a
granulometric
sense
soils
that
surpasses
possible
effect
cratering‐induced
mixing
processes.
extent
varies
spatially
is
influenced
by
targets'
aeolian
setting.
finest
portion
(<125
μm)
likely
mixture
allochthonous
sediment,
globally
sourced
from
atmospheric
suspension,
autochthonous
counterparts
local
rocks,
coarser
(>125
are
mostly
with
inputs
both
unaltered
parent
rock
Stimson
formation
bedrocks
have
undergone
diagenetic
alteration.
If
applicable
globally,
this
would
reinforce
prior
inferences
even
dust‐mantled
regions
geochemically
heterogeneous
owing
substantial
fraction
derived
lithology.
low
intensity
coupling
mobile
elements
suggest
localized,
pH
water‐to‐rock
ratio
aqueous
conditions
under
predominantly
cold
arid
climates,
which
may
occur
either
during
post‐pedogenetic
alteration
or
acidic
source
rocks.
Язык: Английский
Magma Ocean Evolution at Arbitrary Redox State
Journal of Geophysical Research Planets,
Год журнала:
2024,
Номер
129(12)
Опубликована: Дек. 1, 2024
Abstract
Interactions
between
magma
oceans
and
overlying
atmospheres
on
young
rocky
planets
leads
to
an
evolving
feedback
of
outgassing,
greenhouse
forcing,
mantle
melt
fraction.
Previous
studies
have
predominantly
focused
the
solidification
oxidized
Earth‐similar
planets,
but
diversity
in
mean
density
irradiation
observed
low‐mass
exoplanet
census
motivate
exploration
strongly
varying
geochemical
scenarios.
We
aim
explore
how
variable
redox
properties
alter
duration
ocean
solidification,
equilibrium
thermodynamic
state,
fraction
mantle,
atmospheric
composition.
develop
a
1D
coupled
interior‐atmosphere
model
that
can
simulate
time‐evolution
lava
planets.
This
is
applied
across
grid
fixed
states,
orbital
separations,
hydrogen
endowments,
C/H
ratios
around
Sun‐like
star.
The
composition
these
highly
before
during
solidification.
evolutionary
path
Earth‐like
planet
at
1
AU
ranges
permanent
states
within
Myr.
Recently
solidified
typically
host
‐
or
‐dominated
absence
escape.
Orbital
separation
primary
factor
determining
evolution,
followed
by
total
endowment,
oxygen
fugacity,
finally
planet's
ratio.
Collisional
absorption
induces
effect
which
prevent
stall
Through
this
effect,
as
well
outgassing
other
volatiles,
exert
significant
control
over
fate
Язык: Английский