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Formation of Giant Planet Satellites: Recent analyses have shown that the concluding stages of giant planet
formation are accompanied by the development of large-scale meridional flow of
gas inside the planetary Hill sphere. This circulation feeds a circumplanetary
disk that viscously expels gaseous material back into ... | 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 |
Planet-disc interaction on a freely moving mesh: General-purpose, moving-mesh schemes for hydrodynamics have opened the
possibility of combining the accuracy of grid-based numerical methods with the
flexibility and automatic resolution adaptivity of particle-based methods. Due
to their supersonic nature, Keplerian accr... | astro-ph_EP |
Origin of Life Molecules in the Atmosphere After Big Impacts on the
Early Earth: The origin of life on Earth would benefit from a prebiotic atmosphere that
produced nitriles, like HCN, which enable ribonucleotide synthesis. However,
geochemical evidence suggests that Hadean air was relatively oxidizing with
negligibl... | astro-ph_EP |
Discovery of a young subfamily of the (221)~Eos asteroid family: In this work we report the discovery of a young cluster of asteroids that
originated by the breakup of an asteroid member of the (221)Eos family. By
applying the Hierarchical clustering method to the catalog of proper elements
we have identified 26 member... | astro-ph_EP |
Scaling Relations for Terrestrial Exoplanet Atmospheres from Baroclinic
Criticality: The macroturbulent atmospheric circulation of Earth-like planets mediates
their equator-to-pole heat transport. For fast-rotating terrestrial planets,
baroclinic instabilities in the mid-latitudes lead to turbulent eddies that act
to... | astro-ph_EP |
'Oumuamua as a light sail -- evidence against artificial origin: `Oumuamua, the first detected interstellar visitor to the solar system,
exhibits non-gravitational acceleration in its trajectory. Ruling out other
means of propulsion, such as the evaporation of material via a cometary tail,
it has been argued that radia... | astro-ph_EP |
Testing 2D temperature models in Bayesian retrievals of atmospheric
properties from hot Jupiter phase curves: Spectroscopic phase curves of transiting hot Jupiters are spectral
measurements at multiple orbital phases, giving a set of disc-averaged spectra
that probe multiple hemispheres. By fitting model phase curves... | astro-ph_EP |
Feasibility of Passive Sounding of Uranian Moons using Uranian
Kilometric Radiation: We present a feasibility study for passive sounding of Uranian icy moons
using Uranian Kilometric Radio (UKR) emissions in the 100 - 900 kHz band. We
provide a summary description of the observation geometry, the UKR
characteristics,... | astro-ph_EP |
Calibration of quasi-static aberrations in exoplanet direct-imaging
instruments with a Zernike phase-mask sensor. II. Concept validation with
ZELDA on VLT/SPHERE: Warm or massive gas giant planets, brown dwarfs, and debris disks around
nearby stars are now routinely observed by dedicated high-contrast imaging
instr... | astro-ph_EP |
The statistical reliability of 267 GHz JCMT observations of Venus: No
significant evidence for phosphine absorption: In the light of the recent announcement of the discovery of the potential
biosignature phosphine in the atmosphere of Venus I present an independent
reanalysis of the original JCMT data to assess the s... | astro-ph_EP |
Observational and Theoretical study of the inner region of HH 30: HH 30 is a T Tauri star. In this thesis photometric and polarimetric
observations through the source are reported. The observations were carried out
using the 84cm telescope of the National Observatory of Mexico (OAN-SPM). This
thesis also present a mode... | astro-ph_EP |
Dynamical Constraints on Mercury's Collisional Origin: Of the solar system's four terrestrial planets, the origin of Mercury is
perhaps the most mysterious. Modern numerical simulations designed to model the
dynamics of terrestrial planet formation systematically fail to replicate
Mercury; which possesses just 5% the m... | astro-ph_EP |
A New M Dwarf Debris Disk Candidate in a Young Moving Group Discovered
with Disk Detective: We used the Disk Detective citizen science project and the BANYAN II Bayesian
analysis tool to identify a new candidate member of a nearby young association
with infrared excess. WISE J080822.18-644357.3, an M5.5-type debris d... | astro-ph_EP |
Evidence for 9 planets in the HD 10180 system: We re-analyse the HARPS radial velocities of HD 10180 and calculate the
probabilities of models with differing numbers of periodic signals in the data.
We test the significance of the seven signals, corresponding to seven
exoplanets orbiting the star, in the Bayesian frame... | astro-ph_EP |
Survivor bias: divergent fates of the Solar System's ejected vs.
persisting planetesimals: The orbital architecture of the Solar System is thought to have been sculpted
by a dynamical instability among the giant planets. During the instability a
primordial outer disk of planetesimals was destabilized and ended up on
... | astro-ph_EP |
Laplace-like resonances with tidal effects: We generalize the Laplace resonance among three satellites, S1, S2 , and S3,
by considering different ratios of the mean-longitude variations. These
resonances, which we call Laplace-like, are classified as first order in the
cases of the 2:1&2:1, 3:2&3:2, and 2:1&3:2 resonan... | astro-ph_EP |
Small Bodies of the Solar System Active at Large Heliocentric Distances:
Studies with the 6-Meter Telescope of Sao Ras: A detailed study of comets active at large heliocentric distances (greater
than 4 au) which enter the Solar System for the first time and are composed of
matter in its elementary, unprocessed state,... | astro-ph_EP |
The effect of varying atmospheric pressure upon habitability and
biosignatures of Earth-like planets: Understanding the possible climatic conditions on rocky extrasolar planets,
and thereby their potential habitability, is one of the major subjects of
exoplanet research. Determining how the climate, as well as potent... | astro-ph_EP |
Mineralogical Characterization of Baptistina Asteroid Family:
Implications for K/T Impactor Source: Bottke et al. (2007) linked the catastrophic formation of Baptistina Asteroid
Family (BAF) to the K/T impact event. This linkage was based on dynamical and
compositional evidence, which suggested the impactor had a com... | astro-ph_EP |
Exoplanets: past, present, and future: Our understanding of extra-solar planet systems is highly driven by advances
in observations in the past decade. Thanks to high precision spectrograph, we
are able to reveal unseen companions to stars with the radial velocity method.
High precision photometry from the space, espec... | astro-ph_EP |
Time-series photometry of Earth flyby asteroid 2012 DA14: Context. The object 2012 DA14 is a near-Earth asteroid with a size of several
tens of meters. It had approached closely the Earth on 15 February, 2013 UT,
providing an opportunity for precise measurements of this tiny asteroid. Aims.
The solar phase angle of 201... | astro-ph_EP |
Growth of calcium-aluminum-rich inclusions by coagulation and
fragmentation in a turbulent protoplanetary disk: observations and
modelisation: Whereas it is generally accepted that calcium-aluminum-rich inclusions (CAIs)
from chondritic meteorites formed in a hot environment in the solar
protoplanetary disk, the co... | astro-ph_EP |
DMPP-4: Candidate sub-Neptune mass planets orbiting a naked-eye star: We present radial velocity measurements of the very bright ($V\sim5.7$)
nearby F star, DMPP-4 (HD 184960). The anomalously low Ca II H&K emission
suggests mass loss from planets orbiting a low activity host star. Periodic
radial velocity variability ... | astro-ph_EP |
A re-assessment of the Kuiper belt size distribution for sub-kilometer
objects, revealing collisional equilibrium at small sizes: We combine several constraints provided by the crater records on Arrokoth and
the worlds of the Pluto system to compute the size-frequency distribution (SFD)
of the crater production funct... | astro-ph_EP |
Cheap Space-Based Microlens Parallaxes for High-Magnification Events: We show that for high-magnification (Amax > 100) microlensing events,
accurate microlens parallaxes can be obtained from three or fewer photometric
measurements from a small telescope on a satellite in solar orbit at ~1 AU from
Earth. This is 1--2 or... | astro-ph_EP |
C/O and Snowline Locations in Protoplanetary Disks: The Effect of Radial
Drift and Viscous Gas Accretion: The C/O ratio is a defining feature of both gas giant atmospheric and
protoplanetary disk chemistry. In disks, the C/O ratio is regulated by the
presence of snowlines of major volatiles at different distances fro... | astro-ph_EP |
The CRIRES Search for Planets Around the Lowest-Mass Stars. I.
High-Precision Near-Infrared Radial Velocities with an Ammonia Gas Cell: Radial velocities measured from near-infrared spectra are a potentially
powerful tool to search for planets around cool stars and sub-stellar objects.
However, no technique currently... | astro-ph_EP |
An advanced multipole model for (216) Kleopatra triple system: To interpret adaptive-optics observations of (216) Kleopatra, we need to
describe an evolution of multiple moons, orbiting an extremely irregular body
and including their mutual interactions. Such orbits are generally
non-Keplerian and orbital elements are ... | astro-ph_EP |
Long Term Evolution of Planet-Induced Vortices in Protoplanetary Disks: Recent observations of large-scale asymmetric features in protoplanetary
disks suggest that large-scale vortices exist in such disks. Massive planets
are known to be able to produce deep gaps in protoplanetary disks. The gap
edges could become hydr... | astro-ph_EP |
Constraining the Radiation and Plasma Environment of the Kepler
Circumbinary Habitable Zone Planets: The discovery of many planets using the Kepler telescope includes ten planets
orbiting eight binary stars. Three binaries, Kepler-16, Kepler-47, and
Kepler-453, have at least one planet in the circumbinary habitable-z... | astro-ph_EP |
Herschel celestial calibration sources: Four large main-belt asteroids
as prime flux calibrators for the far-IR/sub-mm range: Celestial standards play a major role in observational astrophysics. They are
needed to characterise the performance of instruments and are paramount for
photometric calibration. During the He... | astro-ph_EP |
Quadrupole and octupole order resonances in non-restricted hierarchical
planetary systems: Nonrestricted hierarchical three-body configurations are common in various
scales of astrophysical systems. Dynamical structures of the quadrupole-order
resonance (the von Zeipel-Lidov-Kozai resonance) and the octupole-order
re... | astro-ph_EP |
Planet-Mediated Precision-Reconstruction of the Evolution of the
Cataclysmic Variable HU Aquarius: Cataclysmic variables (CVs) are binaries in which a compact white dwarf
accretes material from a low-mass companion star. The discovery of two planets
in orbit around the CV HU Aquarii opens unusual opportunities for un... | astro-ph_EP |
Systematic KMTNet Planetary Anomaly Search. X. Complete Sample of 2017
Prime-Field Planets: We complete the analysis of planetary candidates found by the KMT
AnomalyFinder for the 2017 prime fields that cover $\sim 13\,{\rm deg}^2$. We
report 3 unambiguous planets: OGLE-2017-BLG-0640, OGLE-2017-BLG-1275, and
OGLE-201... | astro-ph_EP |
Compositional Convection in the Deep Interior of Uranus: Uranus and Neptune share properties that are distinct from the other giant
planets in the solar system, but they are also distinct from one another,
particularly in their relative internal heat flux. Not only does Neptune emit
about ten times the amount of heat t... | astro-ph_EP |
Characterizing the WASP-4 system with TESS and radial velocity data:
Constraints on the cause of the hot Jupiter's changing orbit and evidence of
an outer planet: Orbital dynamics provide valuable insights into the evolution and diversity
of exoplanetary systems. Currently, only one hot Jupiter, WASP-12b, is
confir... | astro-ph_EP |
Semi-analytical near-Earth objects propagation: the orbit history of
(35107) 1991 VH and (175706) 1996 FG3: The propagation of small bodies in the Solar system is driven by the
combination of planetary encounters that cause abrupt changes in their orbits
and secular long-term perturbations. We propose a propagation s... | astro-ph_EP |
Benchmarking the ab initio hydrogen equations of state for the interior
structure of Jupiter: As Juno is presently measuring Jupiter's gravitational moments to
unprecedented accuracy, models for the interior structure of the planet are
putted to the test. While equations of state based on first principles or ab
initi... | astro-ph_EP |
Phase Curves of Nine Trojan Asteroids over a Wide Range of Phase Angles: We have observed well-sampled phase curves for nine Trojan asteroids in B-,
V-, and I-bands. These were constructed from 778 magnitudes taken with the
1.3-m telescope on Cerro Tololo as operated by a service observer for the
SMARTS consortium. Ove... | astro-ph_EP |
Multiverse Predictions for Habitability: Fraction of Life that Develops
Intelligence: Do mass extinctions affect the development of intelligence? If so, we may
expect to be in a universe that is exceptionally placid. We consider the
effects of impacts, supervolcanoes, global glaciations, and nearby gamma ray
bursts, ... | astro-ph_EP |
A Near-coplanar Stellar Flyby of the Planet Host Star HD 106906: We present an investigation into the kinematics of HD 106906 using the newly
released Gaia DR2 catalog to search for close encounters with other members of
the Scorpius-Centaurus (Sco-Cen) association. HD 106906 is an eccentric
spectroscopic binary that h... | astro-ph_EP |
The emergence of relaxation-oscillator convection on Earth and Titan: In relaxation-oscillator (RO) climate states, short-lived convective storms
with torrential rainfall form and dissipate at regular, periodic intervals. RO
states have been demonstrated in two- and three-dimensional simulations of
radiative-convective... | astro-ph_EP |
A Novel Solution for Resonant Scattering Using Self-Consistent Boundary
Conditions: We present two novel additions to the semi-analytic solution of Lyman
$\alpha$ (Ly$\alpha$) radiative transfer in spherical geometry: (1)
implementation of the correct boundary condition for a steady source, and (2)
solution of the ti... | astro-ph_EP |
Thermal Wave Instability as an Origin of Gap and Ring Structures in
Protoplanetary Disks: Recent millimeter and infrared observations have shown that gap and ring-like
structures are common in both dust thermal emission and scattered-light of
protoplanetary disks. We investigate the impact of the so-called Thermal Wa... | astro-ph_EP |
The HARPS search for southern extra-solar planets XXXIV. Occurrence,
mass distribution and orbital properties of super-Earths and Neptune-mass
planets: We report on the results of an 8-year survey carried out at the La Silla
Observatory with the HARPS spectrograph to detect and characterize planets in
the super-Ear... | astro-ph_EP |
Let the Great World Spin: Revealing the Stormy, Turbulent Nature of
Young Giant Exoplanet Analogs with the Spitzer Space Telescope: We present a survey for photometric variability in young, low-mass brown
dwarfs with the Spitzer Space Telescope. The 23 objects in our sample show
robust signatures of youth and share p... | astro-ph_EP |
Distant Comet C/2017 K2 and the Cohesion Bottleneck: Distant long-period comet C/2017 K2 has been outside the planetary region of
the solar system for 3 Myr, negating the possibility that heat retained from
the previous perihelion could be responsible for its activity. This inbound
comet is also too cold for water ice ... | astro-ph_EP |
A dynamical study on the habitability of terrestrial exoplanets II: The
super Earth HD 40307 g: HARPS and it Kepler results indicate that half of solar-type stars host
planets with periods P<100 d and masses M < 30 M_E. These super Earth systems
are compact and dynamically cold. Here we investigate the stability of t... | astro-ph_EP |
Beyond Point Masses. II. Non-Keplerian Shape Effects are Detectable in
Several TNO Binaries: About 40 transneptunian binaries (TNBs) have fully determined orbits with
about 10 others being solved except for breaking the mirror ambiguity. Despite
decades of study almost all TNBs have only ever been analyzed with a mod... | astro-ph_EP |
Galactic Punctuated Equilibrium: How to Undermine Carter's Anthropic
Argument in Astrobiology: We investigate a new strategy which can defeat the (in)famous Carter's
"anthropic" argument against extraterrestrial life and intelligence. In
contrast to those already considered by Wilson, Livio, and others, the present
a... | astro-ph_EP |
Amino Acid Chiral Selection Via Weak Interactions in Stellar
Environments: Implications for the Origin of Life: Magnetochiral phenomena may be responsible for the selection of chiral states
of biomolecules in meteoric environments. For example, the Supernova Amino Acid
Processing (SNAAP) Model was proposed previously... | astro-ph_EP |
Graze-and-Merge Collisions under External Perturbers: Graze-and-merge collisions (GMCs) are common multi-step mergers occurring in
low-velocity off-axis impacts between similar sized planetary bodies. The first
impact happens at somewhat faster than the mutual escape velocity; for typical
impact angles this does not re... | astro-ph_EP |
Mass loading at 67P/Churyumov-Gerasimenko: a case study: We study the dynamics of the interaction between the solar wind ions and a
partially ionized atmosphere around a comet, at a distance of 2.88 AU from the
sun during a period of low nucleus activity. Comparing particle data and mag-
netic field data for a case stu... | astro-ph_EP |
Cloud property trends in hot and ultra-hot giant gas planets (WASP-43b,
WASP-103b, WASP-121b, HAT-P-7b, and WASP-18b): Ultra-hot Jupiters are the hottest exoplanets discovered so far. Observations
begin to provide insight into the composition of their extended atmospheres and
their chemical day/night asymmetries. Bot... | astro-ph_EP |
Trapping dust particles in the outer regions of protoplanetary disks: In order to explain grain growth to mm sized particles and their retention in
outer regions of protoplanetary disks, as it is observed at sub-mm and mm
wavelengths, we investigate if strong inhomogeneities in the gas density
profiles can slow down ex... | astro-ph_EP |
Microbial Fuel Cells Applied to the Metabolically-Based Detection of
Extraterrestrial Life: Since the 1970's, when the Viking spacecrafts carried out experiments aimed
to the detection of microbial metabolism on the surface of Mars, the search for
nonspecific methods to detect life in situ has been one of the goals o... | astro-ph_EP |
New constraints on the planetary system around the young active star AU
Mic. Two transiting warm Neptunes near mean-motion resonance: AU Mic is a young, active star whose transiting planet was recently detected.
We report our analysis of its TESS data, where we modeled the BY Draconis type
quasi-periodic rotational m... | astro-ph_EP |
Impacts of Dust Grains Accelerated by Supernovae on the Moon: There is evidence that ejecta from nearby supernovae have rained down on
Earth in the past. Supernovae can accelerate pre-existing dust grains in the
interstellar medium to speeds of $\sim 0.01 \mathrm{\;c}$. We investigate the
survival and impact of dust gr... | astro-ph_EP |
UKIRT microlensing surveys as a pathfinder for $WFIRST$: The detection
of five highly extinguished low-$|b|$ events: Optical microlensing surveys are restricted from detecting events near the
Galactic plane and center, where the event rate is thought to be the highest,
due to the high optical extinction of these fiel... | astro-ph_EP |
Titan-Hyperion Resonance and the Tidal Q of Saturn: Lainey et al. (2012), by re-analyzing long-baseline astrometry of Saturn's
moons, have found that the moons' tidal evolution is much faster than
previously thought, implying an order of magnitude stronger tidal dissipation
within Saturn. This result is controversial a... | astro-ph_EP |
OGLE-2018-BLG-0567Lb and OGLE-2018-BLG-0962Lb: Two Microlensing Planets
through Planetary-Caustic Channel: We present the analyses of two microlensing events, OGLE-2018-BLG-0567 and
OGLE-2018-BLG-0962. In both events, the short-lasting anomalies were densely
and continuously covered by two high-cadence surveys. The l... | astro-ph_EP |
Asteroid 2014 OL339: yet another Earth quasi-satellite: Our planet has one permanently bound satellite -the Moon-, a likely large
number of mini-moons or transient irregular natural satellites, and three
temporary natural retrograde satellites or quasi-satellites. These quasi-moons
-(164207) 2004 GU9, (277810) 2006 FV3... | astro-ph_EP |
Long-Lived Dust Asymmetries at Dead Zone Edges in Protoplanetary Disks: A number of transition disks exhibit significant azimuthal asymmetries in
thermal dust emission. One possible origin for these asymmetries is dust
trapping in vortices formed at the edges of dead zones. We carry out
high-resolution, two-dimensional... | astro-ph_EP |
Seasonal Evolution of Saturn's Polar Temperatures and Composition: The seasonal evolution of Saturn's polar atmospheric temperatures and
hydrocarbon composition is derived from a decade of Cassini Composite Infrared
Spectrometer (CIRS) 7-16 $\mu$m thermal infrared spectroscopy. We construct a
near-continuous record of ... | astro-ph_EP |
The effect of Jupiter oscillations on Juno gravity measurements: Seismology represents a unique method to probe the interiors of giant
planets. Recently, Saturn's f-modes have been indirectly observed in its rings,
and there is strong evidence for the detection of Jupiter global modes by means
of ground-based, spatiall... | astro-ph_EP |
Episodic deluges in simulated hothouse climates: Earth's distant past and potentially its future include extremely warm
"hothouse" climate states, but little is known about how the atmosphere behaves
in such states. One distinguishing characteristic of hothouse climates is that
they feature lower-tropospheric radiative... | astro-ph_EP |
The first multi-dimensional view of mass loss from externally FUV
irradiated protoplanetary discs: Computing the flow from externally FUV irradiated protoplanetary discs
requires solving complicated and expensive photodissociation physics
iteratively in conjunction with hydrodynamics. Previous studies have therefore
... | astro-ph_EP |
In Search of Recent Disruption of (3200) Phaethon: Model Implication and
Hubble Space Telescope Search: Near-Earth asteroid (3200) Phaethon is notable for its association to a
strong annual meteor shower, the Geminids, indicative of one or more episodes
of mass ejection in the past. The mechanism of Phaethon's past a... | astro-ph_EP |
Pre-perihelion photometric behavior of comet C/2012 S1 (ISON) and its
future prospect: Comet C/2012 S1 (ISON) shows strange photometric behavior compared to many
past comets. Shortly after its discovery, majority of astronomers expected its
surviving until perihelion passage. Unprecedented evolution of its photometri... | astro-ph_EP |
Atmospheric Rossiter-McLaughlin effect and transmission spectroscopy of
WASP-121b with ESPRESSO: WASP-121b is one of the most studied Ultra-hot Jupiters: many recent analyses
of its atmosphere report interesting features at different wavelength ranges.
In this paper we analyze one transit of WASP-121b acquired with t... | astro-ph_EP |
An extensive radial velocity survey toward NGC 6253: The old and metal rich open cluster NGC 6253 was observed with the FLAMES
multi-object spectrograph during an extensive radial velocity campaign
monitoring 317 stars with a median of 15 epochs per object. All the targeted
stars are located along the upper main sequen... | astro-ph_EP |
Gaia Data Release 3: Reflectance spectra of Solar System small bodies: The Gaia mission of the European Space Agency (ESA) has been routinely
observing Solar System objects (SSOs) since the beginning of its operations in
August 2014. The Gaia data release three (DR3) includes, for the first time,
the mean reflectance s... | astro-ph_EP |
On possible life-dispersal patterns beyond the Earth: We model hypothetical bio-dispersal within a single Galactic region using the
stochastic infection dynamics process, which is inspired by these local
properties of life dispersal on Earth. We split the population of stellar
systems into different categories regardin... | astro-ph_EP |
The Shape of Saturn's Huygens Ringlet Viewed by Cassini ISS: A new model for the shape of the prominent eccentric ringlet in the gap
exterior to Saturn's B-ring is developed based on Cassini imaging observations
taken over about 8 years. Unlike previous treatments, the new model treats each
edge of the ringlet separate... | astro-ph_EP |
The Physical Origin of the Venus Low Atmosphere Chemical Gradient: Venus shares many similarities with the Earth, but concomitantly, some of its
features are extremely original. This is especially true for its atmosphere,
where high pressures and temperatures are found at the ground level. In these
conditions, carbon d... | 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 |
An interstellar origin for Jupiter's retrograde co-orbital asteroid: Asteroid (514107) 2015 BZ509 was discovered recently in Jupiter's co-orbital
region with a retrograde motion around the Sun. The known chaotic dynamics of
the outer Solar System have so far precluded the identification of its origin.
Here, we perform ... | astro-ph_EP |
Detection of Rotational Variability in Floofy Objects at Optical
Wavelengths: Phase resolved observations of planetary bodies allow us to understand the
longitudinal and latitudinal variations that make each one unique. Rotational
variations have been detected in several types of astronomical bodies beyond
those of p... | astro-ph_EP |
Physical Characterization of ~2-meter Diameter Near-Earth Asteroid 2015
TC25: A possible boulder from E-type Asteroid (44) Nysa: Small near-Earth asteroids (>20 meters) are interesting because they are
progenitors for meteorites in our terrestrial collection. Crucial to our
understanding of the effectiveness of our a... | astro-ph_EP |
Super stellar abundances of alkali metals suggest significant migration
for Hot Jupiters: We investigate the origin of the measured over-abundance of alkali metals in
the atmospheres of hot gas giants, relative to both their host stars and their
atmospheric water abundances. We show that formation exterior to the wat... | astro-ph_EP |
The Evolving Photometric Lightcurve of Comet 1P/Halley's Coma During the
1985/86 Apparition: We present new analyses of the photometric lightcurve of Comet 1P/Halley
during its 1985/86 apparition. As part of a world-wide campaign coordinated by
the International Halley Watch (IHW), narrowband photometry was obtained ... | astro-ph_EP |
Electric charging of dust aggregates and its effect on dust coagulation
in protoplanetary disks: Mutual sticking of dust aggregates is the first step toward planetesimal
formation in protoplanetary disks. In spite that the electric charging of dust
particles is well recognized in some contexts, it has been largely ig... | astro-ph_EP |
The Chicxulub Impactor: Comet or Asteroid?: A recent paper by Siraj & Loeb (2021) entitled "Breakup of a long-period
comet as the origin of the dinosaur extinction" attempts to revive the
perennial debate about what type of body hit the Earth 66 million years ago,
triggering the end-Cretaceous extinction. Here we criti... | astro-ph_EP |
TERMS Photometry of Known Transiting Exoplanets: The Transit Ephemeris Refinement and Monitoring Survey (TERMS) conducts
radial velocity and photometric monitoring of known exoplanets in order to
refine planetary orbits and predictions of possible transit times. This effort
is primarily directed towards planets not kno... | astro-ph_EP |
H-Atmospheres of Icy Super-Earths Formed in situ in the Outer Solar
System: An Application to a Possible Planet Nine: We examine the possibility that icy super-Earth mass planets, formed over
long time scales (0.1--1~Gyr) at large distances ($\sim$ 200--1000~AU) from
their host stars, will develop massive H-rich atmo... | astro-ph_EP |
Properties and occurrence rates of $Kepler$ exoplanet candidates as a
function of host star metallicity from the DR25 catalog: Correlations between the occurrence rate of exoplanets and their host star
properties provide important clues about the planet formation processes. We
studied the dependence of the observed p... | astro-ph_EP |
The time evolution of $M_{\mathrm{d}}/\dot M$ in protoplanetary discs as
a way to disentangle between viscosity and MHD winds: As the classic viscous paradigm for protoplanetary disk accretion is
challenged by the observational evidence of low turbulence, the alternative
scenario of MHD disk winds is being explored a... | astro-ph_EP |
Segregation on small rubble bodies due to impact-induced seismic shaking: We present a framework to study regolith segregation on rubble-pile asteroids
(self-gravitating granular aggregates) due to seismic shaking induced by
impacts sustained during their lifetimes. We first relate the amplitude and
frequency of surfac... | astro-ph_EP |
Shellspec39 -- a tool for modelling the spectra, light curves, and
images of interacting binaries and exoplanets: Program SHELLSPEC is designed to calculate light curves, spectra, and images
of interacting binaries and extra-solar planets immersed in a moving gaseous or
dusty circumstellar matter. It solves simple ra... | astro-ph_EP |
Gas and multi-species dust dynamics in viscous protoplanetary discs: the
importance of the dust back-reaction: We study the dynamics of a viscous protoplanetary disc hosting a population
of dust grains with a range of sizes. We compute steady-state solutions, and
show that the radial motion of both the gas and the du... | astro-ph_EP |
Multi-wavelength aperture polarimetry of debris disc host stars: Debris discs around main sequence stars have been extensively characterised
from infrared to millimetre wavelengths through imaging, spectroscopic, and
total intensity (scattered light and/or thermal emission) measurements.
Polarimetric observations have ... | astro-ph_EP |
Multibeam Blind Search of Targeted SETI Observations toward 33 Exoplanet
Systems with FAST: The search for extraterrestrial intelligence (SETI) is to search for
technosignatures associated with extraterrestrial life, such as engineered
radio signals. In this paper, we apply the multibeam coincidence matching
(MBCM) s... | astro-ph_EP |
Frequency of Close Companions among Kepler Planets - a TTV study: A transiting planet exhibits sinusoidal transit-time-variations (TTVs) if
perturbed by a companion near a mean-motion-resonance (MMR). We search for
sinusoidal TTVs in more than 2600 Kepler candidates, using the publicly
available Kepler light-curves (Q0... | astro-ph_EP |
Planet formation in small separation binaries: not so excited after all: Existence of planets is binaries with relatively small separations (around 20
AU), such as \alpha Centauri or \gamma Cephei poses severe challenges to
standard planet formation theories. The problem lies in the vigorous secular
excitation of plane... | astro-ph_EP |
Formation of recurring slope lineae on Mars by rarefied gas-triggered
granular flows: Active dark flows known as recurring slope lineae have been observed on the
warmest slopes of equatorial Mars. The morphology, composition and seasonality
of the lineae suggest a role of liquid water in their formation. However,
int... | astro-ph_EP |
OGLE-2017-BLG-0173Lb: Low Mass-Ratio Planet in a "Hollywood"
Microlensing Event: We present microlensing planet OGLE-2017-BLG-0173Lb, with planet-host mass
ratio either $q\simeq 2.5\times 10^{-5}$ or $q\simeq 6.5\times 10^{-5}$, the
lowest or among the lowest ever detected. The planetary perturbation is
strongly dete... | astro-ph_EP |
Planetary Entry Probe Dataset: Analysis and Rules of Thumb for Future
Missions: Since the beginning of robotic interplanetary exploration nearly six decades
ago, successful atmospheric entry has been accomplished at Venus, Earth, Mars,
Jupiter, and Titan. More entry probe missions are planned to Venus, Titan, and
Ura... | astro-ph_EP |
On the Habitable Lifetime of Terrestrial Worlds with High Radionuclide
Abundances: The presence of a liquid solvent is widely regarded as an essential
prerequisite for habitability. We investigate the conditions under which worlds
outside the habitable zones of stars are capable of supporting liquid solvents
on their... | astro-ph_EP |
Solar XUV and ENA-driven water loss from early Venus' steam atmosphere: The influence of the hydrogen hydrodynamic upper atmosphere escape, driven by
the solar soft X-ray and extreme ultraviolet radiation (XUV) flux, on an
expected magma ocean outgassed steam atmosphere of early Venus is studied. By
assuming that the y... | astro-ph_EP |
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