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Exoplanet Biosignatures: Understanding Oxygen as a Biosignature in the
Context of Its Environment: Here we review how environmental context can be used to interpret whether O2
is a biosignature in extrasolar planetary observations. This paper builds on
the overview of current biosignature research discussed in Schwie... | astro-ph_EP |
The Hill Stability of Triple Minor Planets in the Solar System: The triple asteroids and triple Kuiper belt objects (collectively called the
triple minor planets) in the Solar system are of particular interest to the
scientific community since the discovery of the first triple asteroid system in
2004. In this paper, th... | astro-ph_EP |
Spatially Resolved Observations of Meteor Radio Afterglows with the
OVRO-LWA: We conducted an all-sky imaging transient search with the Owens Valley Radio
Observatory Long Wavelength Array (OVRO-LWA) data collected during the Perseid
meteor shower in 2018. The data collection during the meteor shower was
motivated to... | astro-ph_EP |
How long-lived grains dominate the shape of the Zodiacal Cloud: Grain-grain collisions shape the 3-dimensional size and velocity distribution
of the inner Zodiacal Cloud and the impact rates of dust on inner planets, yet
they remain the least understood sink of zodiacal dust grains. For the first
time, we combine the c... | astro-ph_EP |
Tilting Uranus: Collisions versus Spin--Orbit Resonance: In this paper, we investigate whether Uranus's 98$^{\circ}$ obliquity was a
by-product of a secular spin-orbit resonance assuming that the planet
originated closer to the Sun. In this position, Uranus's spin precession
frequency is fast enough to resonate with an... | astro-ph_EP |
Simulating the Formation of Carbon-rich Molecules on an idealised
Graphitic Surface: There is accumulating evidence for the presence of complex molecules,
including carbon-bearing and organic molecules, in the interstellar medium.
Much of this evidence comes to us from studies of chemical composition, photo-
and mass... | astro-ph_EP |
Asteroid models from generalised projections: Essential facts for
asteroid modellers and geometric inverse problem solvers: We present a review of the problem of asteroid shape and spin reconstruction
from generalised projections; i.e., from lightcurves, disk-resolved images,
occultation silhouettes, radar range-Dopp... | astro-ph_EP |
Comparison of planetary Hα-emission models: A new correlation with
accretion luminosity: Accreting planets have been detected through their hydrogen-line emission,
specifically H$\alpha$. To interpret this, stellar-regime empirical
correlations between the H$\alpha$ luminosity $L_\mathrm{H\alpha}$ and the
accretion l... | astro-ph_EP |
A Harsh Test of Far-Field Scrambling with the Habitable Zone Planet
Finder and the Hobby Eberly Telescope: The Habitable zone Planet Finder (HPF) is a fiber fed precise radial velocity
spectrograph at the 10 m Hobby Eberly Telescope (HET). Due to its fixed
altitude design, the HET pupil changes appreciably across a t... | astro-ph_EP |
Localized precipitation and runoff on Mars: We use the Mars Regional Atmospheric Modeling System (MRAMS) to simulate lake
storms on Mars, finding that intense localized precipitation will occur for
lake size >=10^3 km^2. Mars has a low-density atmosphere, so deep convection
can be triggered by small amounts of latent h... | astro-ph_EP |
An integrable model for first-order three-planet mean motion resonances: Recent works on three-planet mean motion resonances (MMRs) have highlighted
their importance for understanding the details of the dynamics of planet
formation and evolution. While the dynamics of two-planet MMRs are well
understood and approximate... | astro-ph_EP |
A Pluto--Charon Sonata: Dynamical Limits on the Masses of the Small
Satellites: During 2005-2012, images from Hubble Space Telescope (HST) revealed four
moons orbiting Pluto-Charon (Weaver et al 2006, Showalter et al 2011, 2012).
Although their orbits and geometric shapes are well-known, the 2$\sigma$
uncertainties i... | astro-ph_EP |
Flybys in debris disk systems with Gaia eDR3: We aim to observationally and statistically constrain the influence of flybys
in the formation and evolution of debris disks. We compiled a sample of 254
debris disks with ages between 2 Myr and 8 Gyr that are either part of an
association or isolated, drawing the binary an... | astro-ph_EP |
Interpretation and diversity of exoplanetary material orbiting white
dwarfs: Nine metal-polluted white dwarfs are observed with medium-resolution optical
spectroscopy,where photospheric abundances are determined and interpreted
through comparison against solar system objects. An improved method of making
such compari... | astro-ph_EP |
Early Mars' habitability and global cooling by H2-based methanogens: During the Noachian, Mars' crust may have provided a favorable environment
for microbial life. The porous brine-saturated regolith would have created a
physical space sheltered from UV and cosmic radiations and provided a solvent,
while the below-grou... | astro-ph_EP |
Salty ice and the dilemma of ocean exoplanet habitability: Habitability of exoplanet's deepest oceans could be limited by the presence
of high-pressure ices at their base. New work demonstrates that efficient
chemical transport within deep planetary ice mantles is possible through
significant salt incorporation within ... | astro-ph_EP |
The HARPS search for southern extra-solar planets XL. Searching for
Neptunes around metal-poor stars: Stellar metallicity -- as a probe of the metallicity of proto-planetary disks
-- is an important ingredient for giant planet formation, likely through its
effect on the timescales in which rocky/icy planet cores can ... | astro-ph_EP |
On the stability of low-mass planets with supercritical hydrospheres: Short-period and low-mass water-rich planets are subject to strong
irradiation from their host star, resulting in hydrospheres in supercritical
state. In this context, we explore the role of irradiation on small terrestrial
planets that are moderatel... | astro-ph_EP |
Dust Coagulation in the Vicinity of a Gap-Opening Jupiter-Mass Planet: We analyze the coagulation of dust in and around a gap opened by a
Jupiter-mass planet. To this end, we carry out a high-resolution
magnetohydrodynamic (MHD) simulation of the gap environment, which is turbulent
due to the magnetorotational instabil... | astro-ph_EP |
Influence of Stellar Multiplicity On Planet Formation. IV. Adaptive
Optics Imaging of Kepler Stars With Multiple Transiting Planet Candidates: The Kepler mission provides a wealth of multiple transiting planet systems
(MTPS). The formation and evolution of multi-planet systems are likely to be
influenced by companion... | astro-ph_EP |
Ejecta Cloud from a Kinetic Impact on the Secondary of a Binary
Asteroid: I. Mechanical Environment and Dynamic Model: An understanding of the post-impact dynamics of ejecta clouds are crucial to
the planning of a kinetic impact mission to an asteroid, and also has great
implications for the history of planetary form... | astro-ph_EP |
Nonlinear behaviour of warped discs around a central object with a
quadrupole moment: The nonlinear behaviour of low-viscosity warped discs is poorly understood.
We verified a nonlinear bending-wave theory, in which fluid columns undergo
affine transformations, with direct 3D hydrodynamical simulations. We employed
a... | astro-ph_EP |
Surveying the Inner Solar System with an Infrared Space Telescope: We present an analysis of surveying the inner Solar System for objects that
may pose some threat to the Earth. Most of the analysis is based on
understanding the capability provided by Sentinel, a concept for an infrared
space-based telescope placed in ... | astro-ph_EP |
Diversity of planetary systems in low-mass disks: Terrestrial-type
planet formation and water delivery: Several studies, observational and theoretical, suggest that planetary
systems with only rocky planets should be the most common in the Universe. We
study the diversity of planetary systems that might form around S... | astro-ph_EP |
Effect of Dust Size on the Near-Infrared Spectra (1.0-5.0 $μ$m) of
Brown Dwarf Atmospheres: In this study, we demonstrate the dependence of atmospheric dust size on the
near-infrared spectra of ten L dwarfs, and constrain the sizes of dust grains
in each L dwarf atmosphere. In previous studies, by comparing observed ... | astro-ph_EP |
EPIC Simulations of Neptune's Dark Spots Using an Active Cloud
Microphysical Model: The Great Dark Spot (GDS-89) observed by Voyager 2 was the first of several
large-scale vortices observed on Neptune, the most recent of which was observed
in 2018 in the northern hemisphere (NDS-2018). Ongoing observations of these
f... | astro-ph_EP |
Tidal Evolution of Close Binary Asteroid Systems: We provide a generalized discussion of tidal evolution to arbitrary order in
the expansion of the gravitational potential between two spherical bodies of
any mass ratio. To accurately reproduce the tidal evolution of a system at
separations less than five times the radi... | astro-ph_EP |
A Bayesian Periodogram Finds Evidence for Three Planets in 47 Ursae
Majoris: A Bayesian analysis of 47 Ursae Majoris (47 UMa) radial velocity data
confirms and refines the properties of two previously reported planets with
periods of 1079 and 2325 days and finds evidence for an additional long period
planet with a pe... | astro-ph_EP |
On the nature of the transition disk around LkCa 15: We present CARMA 1.3 mm continuum observations of the T Tauri star LkCa
15,which resolve the circumstellar dust continuum emission on angular scales
between 0.2-3 arcsec, corresponding to 28-420 AU at the distance of the star.
The observations resolve the inner gap i... | astro-ph_EP |
Model for Nitric oxide and its dayglow emission in the Martian upper
atmosphere using NGIMS/MAVEN measured neutral and ion densities: A comprehensive study of Nitric oxide (NO) chemistry in the Martian upper
atmosphere is restricted due to the lack of requisite measurements. NO is an
abundant form of odd nitrogen spe... | astro-ph_EP |
The M3 project: 2 -- Global distributions of mafic mineral abundances on
Mars: A radiative transfer model was used to reproduce several millions of OMEGA
(Observatoire pour la Min\'eralogie, l'Eau, les Glaces et l'Activit\'e) spectra
representative of igneous terrains of Mars. This task provided the modal
composition... | astro-ph_EP |
Model for Cameron band emission in comets: A case for EPOXI mission
target comet 103P/Hartley 2: The CO2 production rate has been derived in comets using the Cameron band
(a3Pi - X1Sigma) emission of CO molecule assuming that photodissociative
excitation of CO2 is the main production mechanism of CO in a3Pi metastabl... | astro-ph_EP |
Chemical Constraints on the Oxygen Abundances in Jupiter and Saturn: We perform a comparative analysis of the chemical kinetics of CO and $\rm
PH_3$ in Jupiter and Saturn to assess the full set of constraints available on
the troposphere water abundance in the two giant planets. For carbon monoxide
we employ both a wid... | astro-ph_EP |
Alternative Sample Mass Measurement Technique for OSIRIS-REX Sample
Collection Phase: The Origins, Spectral Interpretation, Resource Identification, and
Security-Regolith Explorer (OSIRIS-REx) spacecraft is the third NASA New
Frontiers Program mission and arrived at the near-Earth asteroid (101955) Bennu
in December ... | astro-ph_EP |
The evolution of dust-disk sizes from a homogeneous analysis of 1-10
Myr-old stars: We utilize ALMA archival data to estimate the dust disk size of 152
protoplanetary disks in Lupus (1-3 Myr), Chamaeleon I (2-3 Myr), and Upper-Sco
(5-11 Myr). We combine our sample with 47 disks from Tau/Aur and Oph whose dust
disk ra... | astro-ph_EP |
Growing the seeds of pebble accretion through planetesimal accretion: We explore the growth of planetary embryos by planetesimal accretion up to
and beyond the point where pebble accretion becomes efficient at the so-called
Hill-transition mass. Both the transition mass and the characteristic mass of
planetesimals form... | astro-ph_EP |
The missing cavities in the SEEDS polarized scattered light images of
transitional protoplanetary disks: a generic disk model: Transitional circumstellar disks around young stellar objects have a
distinctive infrared deficit around 10 microns in their Spectral Energy
Distributions (SED), recently measured by the Spit... | astro-ph_EP |
The Apparently Decaying Orbit of WASP-12: We present new transit and occultation times for the hot Jupiter WASP-12b.
The data are compatible with a constant period derivative: $\dot{P}=-29 \pm 3$
ms yr$^{-1}$ and $P/\dot{P}= 3.2$ Myr. However, it is difficult to tell whether
we have observed orbital decay, or a portion... | astro-ph_EP |
The physics of wind-blown sand and dust: The transport of sand and dust by wind is a potent erosional force, creates
sand dunes and ripples, and loads the atmosphere with suspended dust aerosols.
This article presents an extensive review of the physics of wind-blown sand and
dust on Earth and Mars. Specifically, we rev... | astro-ph_EP |
HD45364, a pair of planets in a 3:2 mean motion resonance: Precise radial-velocity measurements with the HARPS spectrograph reveal the
presence of two planets orbiting the solar-type star HD45364. The companion
masses are 0.187 Mjup and 0.658 Mjup, with semi-major axes of 0.681 AU and
0.897 AU, and eccentricities of 0.... | astro-ph_EP |
Discovery of a Two-Armed Spiral Structure in the Gapped Disk in HD
100453: We present VLT/SPHERE adaptive optics imaging in Y$-$, J$-$, H$-$, and
K-bands of the HD 100453 system and the discovery of a two-armed spiral
structure in a disk extending to 0.37" ($\sim$42 AU) from the star, with highly
symmetric arms to th... | astro-ph_EP |
Supermassive Hot Jupiters Provide More Favourable Conditions for the
Generation of Radio Emission via the Cyclotron Maser Instability - A Case
Study Based on Tau Bootis b: We investigate under which conditions supermassive hot Jupiters can sustain
source regions for radio emission, and whether this emission could p... | astro-ph_EP |
A Past Episode of Rapid Tidal Evolution of Enceladus?: Saturn possesses a dynamically rich system containing numerous moons and
impressive rings. Whether the rings of Saturn are much younger than the planet
itself has been a long-open question; more recently a young age has been
proposed for some moons. Recent detectio... | astro-ph_EP |
Secondary eclipses of WASP-18b -- Near Infrared observations with the
Anglo Australian Telescope, the Magellan Clay Telescope and the LCOGT network: We present new eclipse observations for one of the hottest "hot Jupiters"
WASP-18b, for which previously published data from HST WFC3 and Spitzer have
led to radically c... | astro-ph_EP |
Finding Signs of Life in Transit: High-resolution Transmission Spectra
of Earth-like Planets around FGKM Host Stars: Thousands of transiting exoplanets have already been detected orbiting a wide
range of host stars, including the first planets that could potentially be
similar to Earth. The upcoming Extremely Large T... | astro-ph_EP |
Stability of Planetary Motion in Binary Star Systems: We considered the problem of stability for planets of finite mass in binary
star systems. We selected a huge set of initial conditions for planetary orbits
of the S-type, to perform high precision and very extended in time
integrations.
For our numerical integrati... | astro-ph_EP |
Nano dust impacts on spacecraft and boom antenna charging: High rate sampling detectors measuring the potential difference between the
main body and boom antennas of interplanetary spacecraft have been shown to be
efficient means to measure the voltage pulses induced by nano dust impacts on
the spacecraft body itself (... | astro-ph_EP |
Binary planet formation by gas-assisted encounters of planetary embryos: We present radiation hydrodynamic simulations in which binary planets form by
close encounters in a system of several super-Earth embryos. The embryos are
embedded in a protoplanetary disk consisting of gas and pebbles and evolve in a
region where... | astro-ph_EP |
Searching sub-stellar objects in DR1-TGAS, effectiveness and efficiency
of Gaias' astrometry: We used 1,477,047 data from DR1-TGAS, in order to analyse the minimum
require- ments of accuracy, necessary to detect sub-stellar objects in the
astrometric mea- surements of Gaia. We found that the first set of data (DR1)
d... | astro-ph_EP |
Modelling the optical energy profile of the 2021 October Jupiter impact
flash: We have conducted numerical simulations to reproduce the observed optical
energy profile of the 15 October 2021 (UT) impact flash on Jupiter, which was
the largest and the most well-observed flash event detected by ground-based
movie obser... | astro-ph_EP |
Laboratory light scattering from regolith surface and simulation of data
by Hapke model: The small atmosphereless objects of our solar system, such as asteroids, the
moon are covered by layer of dust particles known as regolith, formed by
meteoritic impact. The light scattering studies of such dust layer by
laborator... | astro-ph_EP |
$V$-band photometry of asteroids from ASAS-SN: Finding asteroids with
slow spin: We present $V$-band photometry of the 20,000 brightest asteroids using data
from the All-Sky Automated Survey for Supernovae (ASAS-SN) between 2012 and
2018. We were able to apply the convex inversion method to more than 5,000
asteroids ... | astro-ph_EP |
Ejection of iron-bearing giant-impact fragments and the dynamical and
geochemical influence of the fragment re-accretion: The Earth was born in violence. Many giant collisions of protoplanets are
thought to have occurred during the terrestrial planet formation. Here we
investigated the giant impact stage by using a h... | astro-ph_EP |
Mineral cloud and hydrocarbon haze particles in the atmosphere of the
hot Jupiter JWST target WASP-43b: Having a short orbital period and being tidally locked makes WASP-43b an
ideal candidate for JWST observations. Phase curve observations of an entire
orbit will enable the mapping of the atmospheric structure acros... | astro-ph_EP |
Protoplanetary Disk Heating and Evolution Driven by the Spiral Density
Waves: High-resolution imaging of some protoplanetary disks in scattered light
reveals presence of the global spiral arms of significant amplitude, likely
excited by massive planets or stellar companions. Assuming that these arms are
density waves... | astro-ph_EP |
Revisiting Lambert's Problem: The orbital boundary value problem, also known as Lambert Problem, is
revisited. Building upon Lancaster and Blanchard approach, new relations are
revealed and a new variable representing all problem classes, under
L-similarity, is used to express the time of flight equation. In the new
va... | astro-ph_EP |
Close Stellar Encounters in Young, Substructured, Dissolving Star
Clusters: Statistics and Effects on Planetary Systems: Both simulations and observations indicate that stars form in filamentary,
hierarchically clustered associations, most of which disperse into their
galactic field once feedback destroys their paren... | astro-ph_EP |
The impact of ultraviolet heating and cooling on the dynamics and
observability of lava planet atmospheres: Lava planets have non-global, condensible atmospheres similar to icy bodies
within the solar system. Because they depend on interior dynamics, studying the
atmospheres of lava planets can lead to understanding ... | astro-ph_EP |
A Deep Search for Additional Satellites around the Dwarf Planet Haumea: Haumea is a dwarf planet with two known satellites, an unusually high spin
rate, and a large collisional family, making it one of the most interesting
objects in the outer solar system. A fully self-consistent formation scenario
responsible for the... | astro-ph_EP |
The infrared colors of 51 Eridani b: micrometereoid dust or chemical
disequilibrium?: We reanalyze near-infrared spectra of the young extrasolar giant planet 51
Eridani b which was originally presented in (Macintosh et al. 2015) and (Rajan
et al. 2017) using modern atmospheric models which include a self-consistent
t... | astro-ph_EP |
Five New Post-Main-Sequence Debris Disks with Gaseous Emission: Observations of debris disks, the products of the collisional evolution of
rocky planetesimals, can be used to trace planetary activity across a wide
range of stellar types. The most common end points of stellar evolution are no
exception as debris disks h... | astro-ph_EP |
Reflected light from giant planets in habitable zones: Tapping into the
power of the Cross-Correlation Function: The direct detection of reflected light from exoplanets is an excellent probe
for the characterization of their atmospheres. The greatest challenge for this
task is the low planet-to-star flux ratio, which... | astro-ph_EP |
A self-consistent cloud model for brown dwarfs and young giant
exoplanets: comparison with photometric and spectroscopic observations: We developed a simple, physical and self-consistent cloud model for brown
dwarfs and young giant exoplanets. We compared different parametrisations for
the cloud particle size, by eit... | astro-ph_EP |
Exoplanetary Interiors: The first mass-estimate of an exoplanet around a Sun-like star, 51 Peg b and
the first radius measurement of an exoplanet, HD209458b pointed to the
challenges of understanding the atmosphere, interior, and evolution of
exoplanets including the possibility of mass loss of planets on close-orbits
... | astro-ph_EP |
Using the Sun to estimate Earth-like planets detection capabilities.I.
Impact of cold spots: Stellar spots may in some cases produce radial velocity (RV) signatures
similar to those of exoplanets. To further investigate the impact of spots, we
aim at studying the detectability of Earth mass planets in the habitable z... | astro-ph_EP |
Cool Gaseous Exoplanets: surveying the new frontier with Twinkle: Cool gaseous exoplanets ($1.75\ R_\oplus < R_\text{p} < 3\ R_\text{J}$, $200$
K $<T_\text{eq} < 1000$~K) are an as-yet understudied population, with great
potential to expand our understanding of planetary atmospheres and formation
mechanisms. In this pa... | astro-ph_EP |
On the Detection of Exomoons Transiting Isolated Planetary-Mass Objects: All-sky imaging surveys have identified several dozen isolated planetary-mass
objects (IPMOs), far away from any star. Here, we examine the prospects for
detecting transiting moons around these objects. We expect transiting moons to
be common, occ... | astro-ph_EP |
Ethyl cyanide on Titan: Spectroscopic detection and mapping using ALMA: We report the first spectroscopic detection of ethyl cyanide (C$_2$H$_5$CN)
in Titan's atmosphere, obtained using spectrally and spatially resolved
observations of multiple emission lines with the Atacama Large
Millimeter/submillimeter array (ALMA)... | astro-ph_EP |
Spherical Harmonics for the 1D Radiative Transfer Equation II: Thermal
Emission: Approximate methods to estimate solutions to the radiative transfer equation
are essential for the understanding of atmospheres of exoplanets and brown
dwarfs. The simplest and most popular choice is the "two-stream method" which
is ofte... | astro-ph_EP |
Seasonal Water "Pump" in the Atmosphere of Mars: Vertical Transport to
the Thermosphere: We present results of simulations with the Max Planck Institute general
circulation model (MPI-MGCM) implementing a hydrological cycle scheme. The
simulations reveal a seasonal water "pump" mechanism responsible for the upward
tr... | astro-ph_EP |
Boundary Layer Circumplanetary Accretion: How Fast Could an Unmagnetized
Planet Spin Up Through Its Disk?: Gas giant planets are expected to accrete most of their mass via a
circumplanetary disk. If the planet is unmagnetized and initially slowly
rotating, it will accrete gas via a radially narrow boundary layer and ... | astro-ph_EP |
Seeking echoes of circumstellar disks in Kepler light curves: Light echoes of flares on active stars offer the opportunity for direct
detection of circumstellar dust. We revisit the problem of identifying faint
echoes in post-flare light curves, focusing on debris disks from on-going
planet formation. Starting with sim... | astro-ph_EP |
A Fast Approximate Approach to Microlensing Survey Analysis: Microlensing can be used to discover exoplanets of a wide range of masses
with orbits beyond ~ 1 AU, and even free-floating planets. The WFIRST mission
will use microlensing to discover approximately 1600 planets by monitoring ~100
million stars to find ~5000... | astro-ph_EP |
The composition of hot Jupiter atmospheres assembled within chemically
evolved protoplanetary discs: The radial-dependent positions of snowlines of abundant oxygen- and
carbon-bearing molecules in protoplanetary discs will result in systematic
radial variations in the C/O ratios in the gas and ice. This variation is
... | astro-ph_EP |
Cooling Requirements for the Vertical Shear Instability in
Protoplanetary Disks: The vertical shear instability (VSI) offers a potential hydrodynamic
mechanism for angular momentum transport in protoplanetary disks (PPDs). The
VSI is driven by a weak vertical gradient in the disk's orbital motion, but
must overcome v... | astro-ph_EP |
The case of HD 106906 debris disc: A binary's revenge: Debris disc architecture presents [exo-]planetary scientists with precious
clues for processes of planet formation and evolution, including constraints on
planetary mass perturbers. This is particularly true of the disc in HD 106906,
which in early HST, then follow... | astro-ph_EP |
A pair of TESS planets spanning the radius valley around the nearby
mid-M dwarf LTT 3780: We present the confirmation of two new planets transiting the nearby mid-M
dwarf LTT 3780 (TIC 36724087, TOI-732, $V=13.07$, $K_s=8.204$, $R_s$=0.374
R$_{\odot}$, $M_s$=0.401 M$_{\odot}$, d=22 pc). The two planet candidates are
... | astro-ph_EP |
The inner solar system cratering record and the evolution of impactor
populations: We review previously published and newly obtained crater size-frequency
distributions in the inner solar system. These data indicate that the Moon and
the terrestrial planets have been bombarded by two populations of objects.
Populatio... | astro-ph_EP |
Signatures of an eccentric disc cavity: Dust and gas in IRS 48: We test the hypothesis that the disc cavity in the `transition disc' Oph IRS
48 is carved by an unseen binary companion. We use 3D dust-gas
smoothed-particle hydrodynamics simulations to demonstrate that marginally
coupled dust grains concentrate in the ga... | astro-ph_EP |
Insight from laboratory measurements on dust in debris discs: Extreme adaptive optics instruments have revealed exquisite details on debris
discs, allowing to extract the optical properties of the dust particles such as
the phase function, the degree of polarisation and the spectral reflectance.
These are three powerfu... | astro-ph_EP |
Oort cloud Ecology II: Extra-solar Oort clouds and the origin of
asteroidal interlopers: We simulate the formation and evolution of Oort clouds around the 200 nearest
stars (within 16pc according to the Gaia DR2) database. This study is performed
by numerically integrating the planets and minor bodies in orbit around... | astro-ph_EP |
Traditional formation scenarios fail to explain 4:3 mean motion
resonances: At least two multi-planetary systems in a 4:3 mean motion resonance have been
found by radial velocity surveys. These planets are gas giants and the systems
are only stable when protected by a resonance. Additionally the Kepler mission
has de... | astro-ph_EP |
Using Star Spots to Measure the Spin-orbit Alignment of Transiting
Planets: Spectroscopic follow-up of dozens of transiting planets has revealed the
degree of alignment between the equators of stars and the orbits of the planets
they host. Here we determine a method, applicable to spotted stars, that can
reveal the s... | astro-ph_EP |
Searching for the HR 8799 Debris Disk with HST/STIS: We present a new algorithm for space telescope high contrast imaging of
close-to-face-on planetary disks called Optimized Spatially Filtered (OSFi)
normalization. This algorithm is used on HR 8799 Hubble Space Telescope (HST)
coronagraphic archival data, showing an o... | astro-ph_EP |
Organic hazes as a source of life's building blocks to warm little ponds
on the Hadean Earth: Over 4 billion years ago, Earth is thought to have been a hazy world akin to
Saturn's moon Titan. The organic hazes in the atmosphere at this time could
contain a vast inventory of life's building blocks, and thus may have s... | astro-ph_EP |
Realistic collisional water transport during terrestrial planet
formation: Self-consistent modeling by an N-body--SPH hybrid code: According to current evidence the water inventory of Earth (and perhaps
similar exoplanets) was transported inwards via (giant) collisions during the
chaotic final phase of planet formati... | astro-ph_EP |
Detection and Characterization of Extrasolar Planets through Doppler
Spectroscopy: Over 300 extrasolar planets have been found since 1992, showing that
planetary systems are common and exhibit an outstanding variety of
characteristics. As the number of detections grows and as models of planet
formation progress to ac... | astro-ph_EP |
On the dynamics of Extrasolar Planetary Systems under dissipation.
Migration of planets: We study the dynamics of planetary systems with two planets moving in the
same plane, when frictional forces act on the two planets, in addition to the
gravitational forces. The model of the general three-body problem is used.
Di... | astro-ph_EP |
TOI-1842b: A Transiting Warm Saturn Undergoing Re-Inflation around an
Evolving Subgiant: The imminent launch of space telescopes designed to probe the atmospheres of
exoplanets has prompted new efforts to prioritise the thousands of transiting
planet candidates for follow-up characterisation. We report the detection ... | astro-ph_EP |
Frequencies and resonances around $L_4$ in the elliptic restricted
three-body problem: The stability of the Lagrangian point $L_4$ is investigated in the elliptic
restricted three-body problem by using Floquet's theory. Stable and unstable
domains are determined in the parameter plane of the mass parameter and the
ec... | astro-ph_EP |
The obliquity of Enceladus: The extraordinary activity at Enceladus' warm south pole indicates the
presence of an internal global or local reservoir of liquid water beneath the
surface. While Tyler (2009, 2011) has suggested that the geological activity
and the large heat flow of Enceladus could result from tidal heati... | astro-ph_EP |
Distribution of solids in the rings of the HD 163296 disk: a
multiwavelength study: In this paper we analyze new observations from ALMA and VLA, at a high
angular resolution corresponding to 5 - 8 au, of the protoplanetary disk around
HD 163296 to determine the dust spatial distribution and grain properties. We
fit t... | astro-ph_EP |
First detection of orbital motion for HD 106906 b: A wide-separation
exoplanet on a Planet Nine-like orbit: HD 106906 is a 15 Myr old short-period (49 days) spectroscopic binary that
hosts a wide-separation (737 au) planetary-mass ($\sim11\,M_{\rm Jup}$) common
proper motion companion, HD 106906 b. Additionally, a ci... | astro-ph_EP |
Jetting during oblique impacts of spherical impactors: During the early stages of an impact a small amount material may be jetted
and ejected at speeds exceeding the impact velocity. Jetting is an important
process for producing melt during relatively low velocity impacts. How impact
angle affects the jetting process h... | astro-ph_EP |
Dynamics of Planetary Systems Within Star Clusters: Aspects of the Solar
System's Early Evolution: Most planetary systems -- including our own -- are born within stellar
clusters, where interactions with neighboring stars can help shape the system
architecture. This paper develops an orbit-averaged formalism to chara... | astro-ph_EP |
Chondrule size and related physical properties: a compilation and
evaluation of current data across all meteorite groups: The examination of the physical properties of chondrules has generally
received less emphasis than other properties of meteorites such as their
mineralogy, petrology, and chemical and isotopic com... | astro-ph_EP |
Mars Express measurements of surface albedo changes over 2004 - 2010: The pervasive Mars dust is continually transported between the surface and
the atmosphere. When on the surface, dust increases the albedo of darker
underlying rocks and regolith, which modifies climate energy balance and must
be quantified. Remote ob... | astro-ph_EP |
Dust Ejection from Planetary Bodies by Temperature Gradients: Laboratory
Experiments: Laboratory experiments show that dusty bodies in a gaseous environment eject
dust particles if they are illuminated. We find that even more intense dust
eruptions occur when the light source is turned off. We attribute this to a
com... | astro-ph_EP |
Compact Ultra Dense Matter Impactors: We study interactions of meteorlike compact ultradense objects (CUDO), having
nuclear or greater density, with Earth and other rocky bodies in the Solar
System as a possible source of information about novel forms of matter. We
study the energy loss in CUDO puncture of the body and... | astro-ph_EP |
Multiple Explanations for the Single Transit of KIC 5951458 based on
Radial Velocity Measurements Extracted with a Novel Matched-template
Technique: Planetary systems that show single-transit events are a critical pathway to
increasing the yield of long-period exoplanets from transit surveys. From the
primary Keple... | astro-ph_EP |
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