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Topographic Constraints on the Origin of the Equatorial Ridge on Iapetus: Saturn's moon Iapetus has an equatorial ridge system, which may be as high as
20 km, that may have formed by endogenic forces, such as tectonic and
convective forces, or exogenic processes such as debris infall. We use
high-resolution topographic... | astro-ph_EP |
Mapping the Skies of Ultracool Worlds: Detecting Storms and Spots with
Extremely Large Telescopes: Extremely large telescopes (ELTs) present an unparalleled opportunity to
study the magnetism, atmospheric dynamics, and chemistry of very low mass stars
(VLMs), brown dwarfs, and exoplanets. Instruments such as the Gian... | astro-ph_EP |
Modeling a Transient Secondary Paleo-Lunar Atmosphere: 3-D Simulations
and Analysis: The lunar history of water deposition, loss, and transport post-accretion has
become an important consideration in relation to the possibility of a human
outpost on the Moon. Very recent work has shown that a secondary primordial
atm... | astro-ph_EP |
Tracking Advanced Planetary Systems (TAPAS) with HARPS-N VII. Elder suns
with low-mass companions: We present the current status of and new results from our search for
exoplanets in a sample of solar-mass, evolved stars observed with the HARPS-N
and the 3.6-m Telescopio Nazionale Galileo (TNG), and the High Resolutio... | astro-ph_EP |
OSSOS XVIII: Constraining migration models with the 2:1 resonance using
the Outer Solar System Origins Survey: Resonant dynamics plays a significant role in the past evolution and current
state of our outer Solar System. The population ratios and spatial distribution
of Neptune's resonant populations are direct clues... | astro-ph_EP |
Signals embedded in the radial velocity noise. Periodic variations in
the tau Ceti velocities: The abilities of radial velocity exoplanet surveys to detect the lowest-mass
extra-solar planets are currently limited by a combination of instrument
precision, lack of data, and "jitter". Jitter is a general term for any u... | astro-ph_EP |
Analysis of the arm-like structure in the outer disk of PDS 70. Spiral
density wave or vortex?: Observing dynamical interactions between planets and disks is key to
understanding their formation and evolution. Two protoplanets have recently
been discovered within PDS 70's protoplanetary disk, along with an arm-like
s... | astro-ph_EP |
Is the Solar System Stable ?: Since the formulation of the problem by Newton, and during three centuries,
astronomers and mathematicians have sought to demonstrate the stability of the
Solar System. Thanks to the numerical experiments of the last two decades, we
know now that the motion of the planets in the Solar Syst... | astro-ph_EP |
Computing optical meteor flux using Global Meteor Network data: Meteor showers and their outbursts are the dominant source of meteoroid
impact risk to spacecraft on short time scales. Meteor shower prediction models
depend on historical observations to produce accurate forecasts. However, the
current lack of quality an... | astro-ph_EP |
The peculiar shapes of Saturn's small inner moons as evidence of mergers
of similar-sized moonlets: The Cassini spacecraft revealed the spectacular, highly irregular shapes of
the small inner moons of Saturn, ranging from the unique "ravioli-like" forms
of Pan and Atlas to the highly elongated structure of Prometheus... | astro-ph_EP |
Induced Turbulence and the Density Structure of the Dust Layer in a
Protoplanetary Disk: We study the turbulence induced in the dust layer of a protoplanetary disk
based on the energetics of dust accretion due to gas drag. We estimate
turbulence strength from the energy supplied by dust accretion, using the
radial dr... | astro-ph_EP |
Albedos of Small Hilda Group Asteroids as Revealed by Spitzer: We present thermal 24 $\mu$m observations from the \textit{Spitzer Space
Telescope} of 62 Hilda asteroid group members with diameters ranging from 3 to
12 kilometers. Measurements of the thermal emission when combined with reported
absolute magnitudes allow... | astro-ph_EP |
Uncertainty for calculating transport on Titan: a probabilistic
description of bimolecular diffusion parameters: Bimolecular diffusion coefficients are important parameters used by
atmospheric models to calculate altitude profiles of minor constituents in an
atmosphere. Unfortunately, laboratory measurements of these... | astro-ph_EP |
A Search for Wide Companions to the Extrasolar Planetary System HR 8799: The extrasolar planetary system around HR 8799 is the first multiplanet
system ever imaged. It is also, by a wide margin, the highest mass system with
>27 Jupiters of planetary mass past 25 AU. This is a remarkable system with no
analogue with any... | astro-ph_EP |
On the Effects of Planetary Oblateness on Exoplanet Studies: When studying transiting exoplanets it is common to assume a spherical planet
shape. However short rotational periods can cause a planet to bulge at its
equator, as is the case with Saturn whose equatorial radius is almost 10%
larger than its polar radius. As... | astro-ph_EP |
Dynamics of the TrES-2 system: The TrES-2 system harbors one planet which was discovered with the transit
technique. In this work we investigate the dynamical behavior of possible
additional, lower-mass planets. We identify the regions where such planets can
move on stable orbits and show how they depend on the initial... | astro-ph_EP |
Changes in the physical environment of the inner coma of
67P/Churyumov-Gerasimenko with decreasing heliocentric distance: The Wide Angle Camera of the OSIRIS instrument on board the Rosetta
spacecraft is equipped with several narrowband filters that are centered on the
emission lines and bands of various fragment spe... | astro-ph_EP |
Laboratory Studies of Methane and Its Relationship to Prebiotic
Chemistry: In order to examine how the terrestrial life emerged, a number of laboratory
experiments have been conducted since the 1950s. Methane has been one of the
key molecules in these studies. In earlier studies, strongly reducing gas
mixtures contai... | astro-ph_EP |
On the Vertical Shear Instability in Magnetized Protoplanetary Disks: The vertical shear instability (VSI) is a robust phenomenon in irradiated
protoplanetary disks (PPDs). While there is extensive literature on the VSI in
the hydrodynamic limit, PPDs are expected to be magnetized and their extremely
low ionization fra... | astro-ph_EP |
Post-Impact Thermal Evolution of Porous Planetesimals: Impacts between planetesimals have largely been ruled out as a heat source in
the early Solar System, by calculations that show them to be an inefficient
heat source and unlikely to cause global heating. However, the long-term,
localized thermal effects of impacts ... | astro-ph_EP |
Evolution of the Dust Trail of Comet 17P/Holmes: The massive outburst of the comet 17P/Holmes in October 2007 is the largest
known outburst by a comet thus far. We present a new comprehensive model
describing the evolution of the dust trail produced in this phenomenon. The
model comprises of multiparticle Monte Carlo a... | astro-ph_EP |
Kepler-93b: A Terrestrial World Measured to within 120 km, and a Test
Case for a New Spitzer Observing Mode: We present the characterization of the Kepler-93 exoplanetary system, based
on three years of photometry gathered by the Kepler spacecraft. The duration
and cadence of the Kepler observations, in tandem with t... | astro-ph_EP |
Innocent Bystanders: Orbital Dynamics of Exomoons during Planet-Planet
Scattering: Planet-planet scattering is the leading mechanism to explain the broad
eccentricity distribution of observed giant exoplanets. Here we study the
orbital stability of primordial giant planet moons in this scenario. We use
N-body simulat... | astro-ph_EP |
Atmospheric Reconnaissance of TRAPPIST-1 b with JWST/NIRISS: Evidence
for Strong Stellar Contamination in the Transmission Spectra: TRAPPIST-1 is a nearby system of seven Earth-sized, temperate, rocky
exoplanets transiting a Jupiter-sized M8.5V star, ideally suited for in-depth
atmospheric studies. Each TRAPPIST-1 pl... | astro-ph_EP |
A sub-Mercury-sized exoplanet: Since the discovery of the first exoplanet we have known that other planetary
systems can look quite unlike our own. However, until recently we have only
been able to probe the upper range of the planet size distribution. The high
precision of the Kepler space telescope has allowed us to ... | astro-ph_EP |
Measurement of the vertical atmospheric density profile from the X-ray
Earth occultation of the Crab Nebula with Insight-HXMT: In this paper, the X-ray Earth occultation (XEO) of the Crab Nebula is
investigated by using the Hard X-ray Modulation Telescope (Insight-HXMT). The
pointing observation data on the 30th Sept... | astro-ph_EP |
Moist Convection and the 2010-2011 Revival of Jupiter's South Equatorial
Belt: The transformation of Jupiter's South Equatorial Belt (SEB) from its faded,
whitened state in 2009-2010 to its normal brown appearance is documented via
comparisons of thermal-infrared (5-20 $\mu$m) and visible-light imaging between
Novemb... | astro-ph_EP |
Bifurcation of planetary building blocks during Solar System formation: Geochemical and astronomical evidence demonstrate that planet formation
occurred in two spatially and temporally separated reservoirs. The origin of
this dichotomy is unknown. We use numerical models to investigate how the
evolution of the solar pr... | astro-ph_EP |
Homogeneous model for the TRAPPIST-1e planet with an icy layer: In this work we investigate whether a multilayered planet can be approximated
as a homogeneous planet, and in particular how well the dissipation rate of a
multilayered planet can be reproduced with a homogeneous rheology. We study the
case of a stratified... | astro-ph_EP |
Thermophysical modeling of NEOWISE observations of DESTINY+ targets
Phaethon and 2005 UD: Thermophysical models allow for improved constraints on the physical and
thermal surface properties of asteroids beyond what can be inferred from more
simple thermal modeling, provided a sufficient number of observations is
avai... | astro-ph_EP |
Detection of a Satellite of the Trojan Asteroid (3548) Eurybates -- A
Lucy Mission Target: We describe the discovery of a satellite of the Trojan asteroid (3548)
Eurybates in images obtained with the Hubble Space Telescope. The satellite was
detected on three separate epochs, two in September 2018 and one in January
... | astro-ph_EP |
The flipped orbit of KELT-19Ab inferred from the symmetric TESS transit
light curves: Dozens of planets are now discovered with large orbital obliquity, and have
become the proof for the dynamical evolution of planetary orbits. In the
current samples, there is an apparent clustering of planets around $90^\circ$,
and ... | astro-ph_EP |
The evolution of photo-evaporating viscous discs in binaries: A large fraction of stars are in binary systems, yet the evolution of
proto-planetary discs in binaries has been little explored from the theoretical
side. In this paper we investigate the evolution of the discs surrounding the
primary and secondary componen... | astro-ph_EP |
Polar stellar-spots and grazing planetary transits: possible explanation
for the low number of discovered grazing planets: We assess a physically feasible explanation for the low number of discovered
(near-)grazing planetary transits through all ground and space based transit
surveys. We performed simulations to gene... | astro-ph_EP |
Spectroscopic Coronagraphy for Planetary Radial Velocimetry of
Exoplanets: We propose the application of coronagraphic techniques to the spectroscopic
direct detection of exoplanets via the Doppler shift of planetary molecular
lines. Even for an unresolved close-in planetary system, we show that the
combination of a ... | astro-ph_EP |
A Consistent Reduced Network for HCN Chemistry in Early Earth and Titan
Atmospheres: Quantum Calculations of Reaction Rate Coefficients: HCN is a key ingredient for synthesizing biomolecules such as nucleobases and
amino acids. We calculate 42 reaction rate coefficients directly involved with
or in competition with t... | astro-ph_EP |
Layered semi-convection and tides in giant planet interiors - I.
Propagation of internal waves: Layered semi-convection is a possible candidate to explain Saturn's
luminosity excess and the abnormally large radius of some hot Jupiters. In
giant planet interiors, it could lead to the creation of density staircases,
wh... | astro-ph_EP |
Evidence that the Directly-Imaged Planet HD 131399 Ab is a Background
Star: We present evidence that the recently discovered, directly-imaged planet HD
131399 Ab is a background star with non-zero proper motion. From new JHK1L'
photometry and spectroscopy obtained with the Gemini Planet Imager, VLT/SPHERE,
and Keck/N... | astro-ph_EP |
Observations of Mass Loss from the Transiting Exoplanet HD 209458b: Using the new Cosmic Origins Spectrograph (COS) on the {\it Hubble Space
Telescope (HST)}, we obtained moderate-resolution, high signal/noise
ultraviolet spectra of HD 209458 and its exoplanet HD 209458b during transit,
both orbital quadratures, and se... | astro-ph_EP |
Dissipative Divergence of Resonant Orbits: A considerable fraction of multi-planet systems discovered by the
observational surveys of extrasolar planets reside in mild proximity to
first-order mean motion resonances. However, the relative remoteness of such
systems from nominal resonant period ratios (e.g. 2:1, 3:2, 4:... | astro-ph_EP |
Modelling the Spectra of Planets, Brown Dwarfs and Stars using VSTAR: We describe a new software package capable of predicting the spectra of
solar-system planets, exoplanets, brown dwarfs and cool stars. The Versatile
Software for Transfer of Atmospheric Radiation (VSTAR) code combines a
line-by-line approach to molec... | astro-ph_EP |
The Peculiar Photometric Properties of 2010 WG9: A Slowly-Rotating
Trans-Neptunian Object from the Oort Cloud: We present long-term BVRI observations of 2010 WG9, an ~100-km diameter
trans-Neptunian object (TNO) with an extremely high inclination of 70 deg
discovered by the La Silla - QUEST southern sky survey. Most ... | astro-ph_EP |
The effect of late giant collisions on the atmospheres of protoplanets
and the formation of cold sub-Saturns: We investigate the origins of cold sub-Saturns (CSS), an exoplanetary
population inferred from microlensing surveys. If confirmed, these planets
would rebut a theorised gap in planets' mass distribution betwe... | astro-ph_EP |
Sub-Seasonal Variation in Neptune's Mid-Infrared Emission: We present an analysis of all currently available ground-based imaging of
Neptune in the mid-infrared. Dating between 2003 and 2020, the images reveal
changes in Neptune's mid-infrared ($\sim 8-25\mu$m) emission over time in the
years surrounding Neptune's 2005... | astro-ph_EP |
Time and phase resolved optical spectra of potentially hazardous
asteroid 2014 JO25: The asteroid 2014 JO25, considered to be "potentially hazardous" by the Minor
Planet Center, was spectroscopically followed during its close-Earth encounter
on 19th and 20th of April 2017. The spectra of the asteroid were taken with ... | astro-ph_EP |
Breakup of the Synchronous State of Binary Asteroid Systems: This paper continues the authors' previous work and presents a coplanar
averaged ellipsoid-ellipsoid model of synchronous binary asteroid system (BAS)
plus thermal and tidal effects. Using this model, we analyze the breakup
mechanism of the synchronous BAS. D... | astro-ph_EP |
Cosmogenic nuclide enhancement via deposition from long-period comets as
a test of the Younger Dryas impact hypothesis: We explore the idea that detectable excursions in 26Al may arise from direct
deposition by any bolide, and excursions in 14C and 10Be abundances in the
atmosphere may result from long-period comet i... | astro-ph_EP |
Probing the turbulent mixing strength in protoplanetary disks across the
stellar mass range: no significant variations: Dust settling and grain growth are the first steps in the planet-formation
process in protoplanetary disks. These disks are observed around stars with
different spectral types, and there are indicat... | astro-ph_EP |
Massive Protostellar Disks as a Hot Laboratory of Silicate Grain
Evolution: Typical accretion disks around massive protostars are hot enough for water
ice to sublimate. We here propose to utilize the massive protostellar disks for
investigating the collisional evolution of silicate grains with no ice mantle,
which is... | astro-ph_EP |
An accurate, extensive, and practical line list of methane for the
HITEMP database: A methane line list for the HITEMP spectroscopic database, covering 0-13,400
cm$^{-1}$ ($>$746 nm), is presented. To create this compilation, ab initio line
lists of $^{12}$CH$_{4}$ from Rey et al. (2017) ApJ, 847, 105 (provided at
se... | astro-ph_EP |
Tidal Downsizing Model. IV. Destructive feedback in planets: I argue that feedback is as important to formation of planets as it is to
formation of stars and galaxies. Energy released by massive solid cores puffs
up pre-collapse gas giant planets, making them vulnerable to tidal disruptions
by their host stars. I find ... | astro-ph_EP |
How does Background Air Pressure Influence the Inner Edge of the
Habitable Zone for Tidally Locked Planets in a 3D View?: We examine the effect of varying background N2 surface pressure (labelled as
pN2) on the inner edge of the habitable zone for 1:1 tidally locked planets
around M dwarfs, using the three-dimensiona... | astro-ph_EP |
The heating history of Vesta and the onset of differentiation: In this work we study the link between the evolution of the internal
structure of Vesta and thermal heating due to 26Al and 60Fe and long-lived
radionuclides, taking into account the chemical differentiation of the body and
the affinity of 26Al with silicat... | astro-ph_EP |
Testing the Early Mars H2-CO2 Greenhouse Hypothesis with a 1-D
Photochemical Model: A recent study by Ramirez et al. (2014) demonstrated that an atmosphere with
1.3-4 bar of CO2 and H2O, in addition to 5-20% H2, could have raised the mean
annual and global surface temperature of early Mars above the freezing point of... | astro-ph_EP |
The size-frequency distribution of H>13 NEOs and ARM targets detected by
Pan-STARRS1: We determine the absolute magnitude (H) distribution (or size-frequency
distribution, SFD; $N(H) \propto 10^{\alpha H}$ where $\alpha$ is the slope of
the distribution) for near-Earth objects (NEO) with $13<H<30$ and Asteroid
Retrie... | astro-ph_EP |
Exoplanet Nodal Precession Induced by Rapidly Rotating Stars: Impacts on
Transit Probabilities and Biases: For the majority of short period exoplanets transiting massive stars with
radiative envelopes, the spin angular momentum of the host star is greater than
the planetary orbital angular momentum. In this case, the... | astro-ph_EP |
Detection of the hydrogen Balmer lines in the ultra-hot Jupiter WASP-33b: Ultra-hot Jupiters (UHJs) are highly irradiated giant exoplanets with
extremely high day-side temperatures, which lead to thermal dissociation of
most of the molecular species. It is expected that the neutral hydrogen atom is
one of the main spec... | astro-ph_EP |
Properties of the irregular satellite system around Uranus inferred from
K2, Herschel and Spitzer observations: In this paper we present visible range light curves of the irregular Uranian
satellites Sycorax, Caliban, Prospero, Ferdinand and Setebos taken with Kepler
Space Telescope in the course of the K2 mission. T... | astro-ph_EP |
Accurate reference spectra of HD in H$_2$/He bath for planetary
applications: The hydrogen deuteride (HD) molecule is an important deuterium tracer in
astrophysical studies. The atmospheres of gas giants are dominated by molecular
hydrogen, and simultaneous observation of H$_2$ and HD lines provides reliable
informat... | astro-ph_EP |
Physical properties of near-Earth asteroid (2102) Tantalus from
multi-wavelength observations: Between 2010 and 2017 we have collected new optical and radar observations of
the potentially hazardous asteroid (2102)~Tantalus from the ESO NTT and Danish
telescopes at the La Silla Observatory and from the Arecibo planet... | astro-ph_EP |
Effects of the Planetary Temperature on the Circumplanetary Disk and on
the Gap: Circumplanetary disks regulate the late accretion to the giant planet and
serve as the birthplace for satellites. Understanding their characteristics via
simulations also helps to prepare for their observations. Here we study disks
aroun... | astro-ph_EP |
Search for serendipitous TNO occultation in X-rays: To study the population properties of small, remote objects beyond Neptune's
orbit in the outer solar system, of kilometer size or smaller, serendipitous
occultation search is so far the only way. For hectometer-sized Trans-Neptunian
Objects (TNOs), optical shadows ac... | astro-ph_EP |
A radiative-convective equilibrium model for young giant exoplanets:
Application to beta Pictoris b: We present a radiative-convective equilibrium model for young giant
exoplanets. Model predictions are compared with the existing photometric
measurements of planet beta Pictoris b in the J, H, Ks, L', NB 4.05, M' band... | astro-ph_EP |
An evidence for solar activity influence on the meteorological processes
in the south polar region of Mars during the great opposition in AD 1924: A time series of the Martian south ice polar cap mean diameter for the period
July-December 1924 is investigated. The data are based on the high quality
pictures, which ar... | astro-ph_EP |
Do we really know the dust? Systematics and uncertainties of the
mid-infrared spectral analysis methods: The spectral region around 10 micrometer, showing prominent dust emission
bands, is commonly used to derive the chemical composition of protoplanetary
dust. Different analysis methods have been proposed for this p... | astro-ph_EP |
Rapid Mid-Infrared Variability in Protostellar Disks: Spectral energy distribution (SED) in protostellar disks is determined by the
disks'internal dissipation and reprocessing of irradiation from their host
stars. Around T Tauri stars, most mid-infrared (MIR) radiation (in a few to a
few ten {\mu}m wavelength range) em... | astro-ph_EP |
Ghost in the time series: no planet for Alpha Cen B: We re-analyse the publicly available radial velocity (RV) measurements for
Alpha Cen B, a star hosting an Earth-mass planet candidate, Alpha Cen Bb, with
3.24 day orbital period. We demonstrate that the 3.24 d signal observed in the
Alpha Cen B data almost certainly ... | astro-ph_EP |
Wall emission in circumbinary disks: the case of CoKu Tau/4: A few years ago, the mid-IR spectrum of a Weak Line T Tauri Star, CoKu Tau/4,
was explained as emission from the inner wall of a circumstellar disk, with the
inner disk truncated at ~10 AU. Based on the SED shape and the assumption that
it was produced by a s... | astro-ph_EP |
Cleaning our Hazy Lens: Exploring Trends in Transmission Spectra of Warm
Exoplanets: Relatively little is understood about the atmospheric composition of
temperate to warm exoplanets (equilibrium temperature $T_{\rm eq}<$ 1000 K), as
many of them are found to have uncharacteristically flat transmission spectra.
Their... | astro-ph_EP |
Earths are not Super-Earths, Saturns are not Jupiters: Imprints of
pressure-bump planet formation on planetary architectures: In protoplanetary disks, sufficiently massive planets excite pressure bumps,
which can then be preferred locations for forming new planet cores. We discuss
how this loop may affect the archite... | astro-ph_EP |
Finding regions of bounded motion in binary asteroid environment using
Lagrangian descriptors: Trajectory design in highly-perturbed environments like binary asteroids is
challenging. It typically requires using realistic, non-autonomous dynamical
models in which periodic solutions derived in autonomous systems vanis... | astro-ph_EP |
Fate of the runner in hit-and-run collisions: In similar-sized planetary collisions, a significant part of the impactor
often misses the target and continues downrange. We follow the dynamical
evolution of "runners" from giant impacts to determine their ultimate fate.
Surprisingly, runners re-impact their target planet... | astro-ph_EP |
Characterization of the HD 108236 system with CHEOPS and TESS.
Confirmation of a fifth transiting planet: The HD108236 system was first announced with the detection of four small
planets based on TESS data. Shortly after, the transit of an additional planet
with a period of 29.54d was serendipitously detected by CHEO... | astro-ph_EP |
Prospecting for exo-Earths in multiple planet systems with a gas giant: In this work, we hunt for the best places to find exo-Earths in the currently
known exoplanet population. While it is still unclear whether Jupiter had a
beneficial or detrimental effect on the creation of the right environment for a
habitable Eart... | astro-ph_EP |
On the coexistence of the streaming instability and the vertical shear
instability in protoplanetary disks: The streaming instability is a leading candidate mechanism to explain the
formation of planetesimals. Yet, the role of this instability in the driving of
turbulence in protoplanetary disks, given its fundamenta... | astro-ph_EP |
Stellar Spin-Orbit Misalignment in a Multiplanet System: Stars hosting hot Jupiters are often observed to have high obliquities,
whereas stars with multiple co-planar planets have been seen to have low
obliquities. This has been interpreted as evidence that hot-Jupiter formation
is linked to dynamical disruption, as op... | astro-ph_EP |
Latitudinal Variation of Clouds' Structure Responsible for Venus' Cold
Collar: Global Climate Models (GCM) are very useful tools to study theoretically the
general dynamics and specific phenomena in planetary atmospheres. In the case
of Venus, several GCMs succeeded in reproducing the atmosphere's superrotation
and t... | astro-ph_EP |
Inner Boundary Condition in Quasi-Lagrangian Simulations of Accretion
Disks: In simulations of viscously evolving accretion disks, the inner boundary
condition is particularly important. If treated incorrectly, it induces
incorrect behavior very quickly, because the viscous time is shortest near the
inner boundary. R... | astro-ph_EP |
Constraining the gap size in the disk around HD 100546 in the
mid-infrared: We refine the gap size measurements of the disk surrounding the Herbig Ae
star HD 100546 in the N band. Our new mid-infrared interferometric (MIDI) data
have been taken with the UT baselines and span the full range of orientations.
The correl... | astro-ph_EP |
Five key exoplanet questions answered via the analysis of 25 hot Jupiter
atmospheres in eclipse: Population studies of exoplanets are key to unlocking their statistical
properties. So far the inferred properties have been mostly limited to
planetary, orbital and stellar parameters extracted from, e.g., Kepler, radial... | astro-ph_EP |
Debris Disks: Seeing Dust, Thinking of Planetesimals and Planets: Debris disks are optically thin, almost gas-free dusty disks observed around
a significant fraction of main-sequence stars older than about 10 Myr. Since
the circumstellar dust is short-lived, the very existence of these disks is
considered as evidence t... | astro-ph_EP |
Tidal Evolution of the Evection Resonance/Quasi-Resonance and the
Angular Momentum of the Earth-Moon System: Forming the Moon by a high-angular momentum impact may explain the Earth-Moon
isotopic similarities, however, the post-impact angular momentum needs to be
reduced by a factor of 2 or more to the current value ... | astro-ph_EP |
UV Surface Environment of Earth-like Planets Orbiting FGKM Stars Through
Geological Evolution: The UV environment of a host star affects the photochemistry in the
atmosphere, and ultimately the surface UV environment for terrestrial planets
and therefore the conditions for the origin and evolution of life. We model t... | astro-ph_EP |
Kelvin-Helmholtz Instabilities in Multi-Sized Dust Layers: We examine the effect of the dust size distribution on Kelvin-Helmholtz
instabilities in the protoplanetary disk with dust sedimentation. With newly
taking into account the dust size distribution, the growth rate of the
Kelvin-Helmholtz instability is calculate... | astro-ph_EP |
Orbital Evolution of Moons in Weakly Accreting Circumplanetary Disks: We investigate the formation of hot and massive circumplanetary disks (CPDs)
and the orbital evolution of satellites formed in these disks. Because of the
comparatively small size-scale of the sub-disk, quick magnetic diffusion
prevents the magnetoro... | astro-ph_EP |
Eccentric Companions to Kepler-448b and Kepler-693b: Clues to the
Formation of Warm Jupiters: I report the discovery of non-transiting close companions to two transiting
warm Jupiters (WJs), Kepler-448/KOI-12b (orbital period
$P=17.9\,\mathrm{days}$, radius $R_{\rm p}=1.23^{+0.06}_{-0.05}\,R_{\rm Jup}$)
and Kepler-69... | astro-ph_EP |
Orbit classification in the planar circular Pluto-Charon system: We numerically investigate the orbital dynamics of a spacecraft, or a comet,
or an asteroid in the Pluto-Charon system in a scattering region around Charon
using the planar circular restricted three-body problem. The test particle can
move in bounded orbi... | astro-ph_EP |
Planet populations inferred from debris discs: insights from 178 debris
systems in the ISPY, LEECH and LIStEN planet-hunting surveys: We know little about the outermost exoplanets in planetary systems, because
our detection methods are insensitive to moderate-mass planets on wide orbits.
However, debris discs can pro... | astro-ph_EP |
Dust Growth and Magnetic Fields: from Cores to Disks (even down to
Planets): The recent rapid progress in observations of circumstellar disks and
extrasolar planets has reinforced the importance of understanding an intimate
coupling between star and planet formation. Under such a circumstance, it may
be invaluable to... | astro-ph_EP |
SWEET-Cat updated. New homogenous spectroscopic parameters: Context: Exoplanets have now been proven to be very common. The number of its
detections continues to grow following the development of better instruments
and missions. One key step for the understanding of these worlds is their
characterization, which mostly ... | astro-ph_EP |
"TNOs are Cool": A survey of the trans-Neptunian region XIV. Size/albedo
characterization of the Haumea family observed with Herschel and Spitzer: A group of trans-Neptunian objects (TNO) are dynamically related to the dwarf
planet 136108 Haumea. Ten of them show strong indications of water ice on their
surfaces, are... | astro-ph_EP |
Thermophysical Characteristics of OSIRIS-REx Target Asteroid (101955)
Bennu: In this work, we investigate the thermophysical properties, including thermal
inertia, roughness fraction and surface grain size of OSIRIS-REx target
asteroid (101955) Bennu by using a thermophysical model with the recently
updated 3D radar-... | astro-ph_EP |
A Distinct Population of Small Planets: Sub-Earths: The sizes of small planets have been known to be bi-modal, with a gap
separating planets that have lost their primordial atmospheres (super-Earths),
and the ones that retain them (mini-Neptunes). Here, we report evidences for
another distinct population at smaller siz... | astro-ph_EP |
Topographic Constraints on the Origin of the Equatorial Ridge on Iapetus: Saturn's moon Iapetus has an equatorial ridge system, which may be as high as
20 km, that may have formed by endogenic forces, such as tectonic and
convective forces, or exogenic processes such as debris infall. We use
high-resolution topographic... | astro-ph_EP |
Ring Formation in Protoplanetary Disks Driven by an Eccentric
Instability: We find that, under certain conditions, protoplanetary disks may
spontaneously generate multiple, concentric gas rings without an embedded
planet through an eccentric cooling instability. Using both linear theory and
non-linear hydrodynamics s... | astro-ph_EP |
A Simple Phenomenological Model for Grain Clustering in Turbulence: We propose a simple model for density fluctuations of aerodynamic grains,
embedded in a turbulent, gravitating gas disk. The model combines a calculation
for the behavior of a group of grains encountering a single turbulent eddy,
with a hierarchical ap... | astro-ph_EP |
Climate Modeling of a Potential ExoVenus: The planetary mass and radius sensitivity of exoplanet discovery capabilities
has reached into the terrestrial regime. The focus of such investigations is to
search within the Habitable Zone where a modern Earth-like atmosphere may be a
viable comparison. However, the detection... | astro-ph_EP |
Physical properties, transmission and emission spectra of the WASP-19
planetary system from multi-colour photometry: We present new ground-based, multi-colour, broad-band photometric
measurements of the physical parameters, transmission and emission spectra of
the transiting extrasolar planet WASP-19b. The measuremen... | astro-ph_EP |
Outbursting Comet P/2010 V1 (Ikeya-Murakami): A Miniature Comet Holmes: Short-period comet P/2010 V1 (Ikeya-Murakami, hereafter V1) was discovered
visually by two amateur astronomers. The appearance of the comet was peculiar,
consisting of an envelope, a spherical coma near the nucleus and a tail
extending in the anti-... | astro-ph_EP |
Results from a set of three-dimensional numerical experiments of a hot
Jupiter atmosphere: We present highlights from a large set of simulations of a hot Jupiter
atmosphere, nominally based on HD 209458b, aimed at exploring both the
evolution of the deep atmosphere, and the acceleration of the zonal flow or
jet. We f... | astro-ph_EP |
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