Latest in astro-ph.ep

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Effects of a Binary Companion Star on Habitability of Tidally Locked Planets around an M-type Host StarJun 13 2019Planets in the "Habitable Zones" around M-type stars are important targets for characterization in future observations. Due to tidal-locking in synchronous spin-orbit rotations, the planets tend to have a hot dayside and a cold nightside. On the cold ... More
Atmospheric Dynamics on Terrestrial Planets: The Seasonal Response to changes in Orbital, Rotational and Radiative TimescalesJun 13 2019Thousands of exoplanets have been detected to date, and with future planned missions this tally will increase. Understanding the climate dependence on the planetary parameters is vital for the study of terrestrial exoplanet habitability. Using an idealized ... More
A HERO for general relativityJun 13 2019HERO (Highly Eccentric Relativity Orbiter) is a space-based mission concept aimed to perform several tests of post-Newtonian gravity around the Earth with a preferably drag-free spacecraft moving along a highly elliptical path fixed in its plane undergoing ... More
Determining mass limits around HD163296 through SPHERE direct imaging dataJun 13 2019HD163296 is a Herbig Ae/Be star known to host a protoplanetary disk with a ringed structure. To explain the disk features, previous works proposed the presence of planets embedded into the disk. We have observed HD163296 with the near-infrared (NIR) branch ... More
Evolutionary models for ultracool dwarfsJun 13 2019Ultracool dwarfs have emerged as key targets for searches of transiting exoplanets. Precise estimates of the host parameters (including mass, age, and radius) are fundamental to constrain the physical properties of orbiting exoplanets. We have extended ... More
Local semi-analytic models of magnetic flux transport in protoplanetary discsJun 13 2019The evolution of a large-scale poloidal magnetic field in an accretion disc is an important problem because it determines the launching of winds and the feasibility of the magnetorotational instability to generate turbulence or channel flows. Recent studies, ... More
Evidence from stellar rotation for early disc dispersal owing to close companionsJun 13 2019Young low-mass stars of equal-mass exhibit a distribution of rotation periods. At the very early phases of stellar evolution, this distribution is set by the star-disc locking mechanism. The primordial disc lifetime and, consequently, the duration of ... More
HL Tau disk in HCO+ (3-2) and (1-0) with ALMA: gas density, temperature, gap, and one-arm spiralJun 13 2019We present our observational results of the 1.1 mm continuum and the HCO+ (3-2) line in HL Tau at angular resolutions of 0.1" obtained with ALMA and our data analysis of the 2.9 mm and 1.1 mm continuum and the HCO+ (3-2) and (1-0) lines of the HL Tau ... More
Capture of Solids by Growing Proto-gas Giants: Effects of Gap Formation and Supply-limited GrowthJun 13 2019Studies of internal structure of gas giant planets suggest that their envelopes are enriched with heavier elements than hydrogen and helium relative to their central stars. Such enrichment likely occurred by solid accretion during late formation stages ... More
The HD 181433 Planetary System: Dynamics and a New Orbital SolutionJun 13 2019We present a detailed analysis of the orbital stability of the HD 181433 planetary system, finding it to exhibit strong dynamical instability across a wide range of orbital eccentricities, semi-major axes, and mutual inclinations. We also analyse the ... More
The escape of hydrogen-rich atmosphere of exoplanet: Mass loss rates and the absorptions of stellar Lyman $α$Jun 13 2019Since the mass loss rates are the function of the mean density of the planet and the stellar irradiation, we calculated about 450 models covering planets with different densities and stellar irradiation. Our results show that the mass loss rates are dependent ... More
Io's Volcanic Activity from Time Domain Adaptive Optics Observations: 2013-2018Jun 12 2019We present measurements of the near-infrared brightness of Io's hot spots derived from 2-5 micron imaging with adaptive optics on the Keck and Gemini N telescopes. The data were obtained on 271 nights between August 2013 and the end of 2018, and include ... More
Streaming instability: saturation in turbulent protoplanetary disksJun 12 2019The streaming instability for solid particles in protoplanetary disks is re-examined assuming the familiar alpha ($\alpha$) model for isotropic turbulence. Turbulence always reduces the growth rates of the streaming instability relative to values calculated ... More
Halo MeteorsJun 12 2019The stellar halo contains some of the oldest stars in the Milky Way galaxy and in the universe. The detections of `Oumuamua, CNEOS 2014-01-08, and interstellar dust serve to calibrate the production rate of interstellar objects. We study the feasibility ... More
Long-Lived Eccentricities in Accretion DisksJun 12 2019Accretion disks can be eccentric: they support $m=1$ modes that are global and slowly precessing. But whether the modes remain trapped in the disk---and hence are long-lived---depends on conditions at the outer edge of the disk. Here we show that in disks ... More
MASCARA-3b: A hot Jupiter transiting a bright F7 star in an aligned orbitJun 12 2019We report the discovery of MASCARA-3b, a hot Jupiter orbiting its late, bright (V=8.33) F-type host every $5.55149\pm 0.00001$ days on an almost circular orbit ($e = 0.085^{+0.023}_{-0.022}$). It is the fourth exoplanet discovered with the Multi-site ... More
On The XUV Luminosity Evolution of TRAPPIST-1Jun 12 2019We model the long-term XUV luminosity of TRAPPIST-1 to constrain the evolving high-energy radiation environment experienced by its planetary system. Using Markov Chain Monte Carlo (MCMC), we derive probabilistic constraints for TRAPPIST-1's stellar and ... More
A self-consistent weak friction model for the tidal evolution of circumbinary planetsJun 12 2019We present a self-consistent model for the tidal evolution of circumbinary planets. Based on the weak-friction model, we derive expressions of the resulting forces and torques considering complete tidal interactions between all the bodies of the system. ... More
A Thousand Earths: A Very Large Aperture, Ultralight Space Telescope Array for Atmospheric Biosignature SurveysJun 12 2019An outstanding, multi-disciplinary goal of modern science is the study of the diversity of potentially Earth-like planets and the search for life in them. This goal requires a bold new generation of space telescopes, but even the most ambitious designs ... More
Yarkovsky effect detection and updated impact hazard assessment for near-Earth asteroid (410777) 2009 FDJun 12 2019Near-Earth asteroid (410777) 2009 FD is a potentially hazardous asteroid with potential impacts on Earth at the end of the 22nd century. The astrometry collected during the 2019 apparition provides information on the trajectory of (410777) by constraining ... More
Greening of the Brown Dwarf Desert. EPIC 212036875 b -- a 51 M$_\mathrm{J}$ object in a 5 day orbit around an F7 V starJun 12 2019Jun 13 2019Our aim is to investigate the nature and formation of brown dwarfs by adding a new well-characterised object to the small sample of less than 20 transiting brown dwarfs. One brown dwarf candidate was found by the KESPRINT consortium when searching for ... More
Greening of the Brown Dwarf Desert. EPIC 212036875 b -- a 51 M$_\mathrm{J}$ object in a 5 day orbit around an F7 V starJun 12 2019Our aim is to investigate the nature and formation of brown dwarfs by adding a new well-characterised object to the small sample of less than 20 transiting brown dwarfs. One brown dwarf candidate was found by the KESPRINT consortium when searching for ... More
The Effect of Binarity on Circumstellar Disk EvolutionJun 12 2019We present new results on how the presence of stellar companions affects disk evolution based on a study of the 5-11 Myr old Upper Scorpius OB Association. Of the 50 G0-M3 Upper Sco members with disks in our sample, only seven host a stellar companion ... More
Disentangling Planets from Photoelectric Instability in Gas-Rich Optically Thin Dusty DisksJun 11 2019Structures in circumstellar disks such as gaps and rings are often attributed to planets. This connection has been difficult to show unequivocally, as other processes may also produce these features. Particularly, a photoelectric instability (PEI) has ... More
Mass Loss from the Exoplanet WASP-12b Inferred from $\textit{Spitzer}$ Phase CurvesJun 11 2019The exoplanet WASP-12b is the prototype for the emerging class of ultra-hot, Jupiter-mass exoplanets. Past models have predicted---and near ultra-violet observations have shown---that this planet is losing mass. We present an analysis of two sets of 3.6 ... More
Mass Loss from the Exoplanet WASP-12b Inferred from $\textit{Spitzer}$ Phase CurvesJun 11 2019Jun 13 2019The exoplanet WASP-12b is the prototype for the emerging class of ultra-hot, Jupiter-mass exoplanets. Past models have predicted---and near ultra-violet observations have shown---that this planet is losing mass. We present an analysis of two sets of 3.6 ... More
Frequency of planets orbiting M dwarfs in the Solar neighbourhoodJun 11 2019The most abundant stars in the Galaxy, M dwarfs, are very commonly hosts to diverse systems of low-mass planets. Their abundancy implies that the general occurrence rate of planets is dominated by their occurrence rate around such M dwarfs. In this article, ... More
Normalization of Hamiltonian and Nonlinear Stability of the Triangular Equilibrium Points in Non-resonance Case with PerturbationsJun 11 2019For the study of nonlinear stability of a dynamical system, normalized Hamiltonian of the system is very important to discuss the dynamics in the vicinity of invariant objects. In general, it represents a nonlinear approximation to the dynamics, which ... More
Normalization of Hamiltonian and nonlinear stability of triangular equilibrium points in the photogravitational restricted three body problem with P-R drag in non-resonance caseJun 11 2019Normal forms of Hamiltonian are very important to analyze the nonlinear stability of a dynamical system in the vicinity of invariant objects. This paper presents the normalization of Hamiltonian and the analysis of nonlinear stability of triangular equilibrium ... More
Lyman-alpha in the GJ 1132 System: Stellar Emission and Planetary Atmospheric EvolutionJun 10 2019GJ 1132b, which orbits an M dwarf, is one of the few known Earth-sized planets, and at 12 pc away it is one of the closest known transiting planets. Receiving roughly 19x Earth's insolation, this planet is too hot to be habitable but can inform us about ... More
Radiation pressure clear-out of dusty photoevaporating discsJun 10 2019Theoretical models of protoplanetary disc dispersal predict a phase where photoevaporation has truncated the disc at several AU, creating a pressure trap which is dust-rich. Previous models predicted this phase could be long-lived (~Myr), contrary to ... More
Growth Model Interpretation of Planet Size DistributionJun 10 2019The radii and orbital periods of 4000+ confirmed/candidate exoplanets have been precisely measured by the Kepler mission. The radii show a bimodal distribution, with two peaks corresponding to smaller planets (likely rocky) and larger intermediate-size ... More
k-Means Aperture Optimization Applied to Kepler K2 Time Series Photometry of TitanJun 10 2019Motivated by the Kepler K2 time series of Titan, we present an aperture optimization technique for extracting photometry of saturated moving targets with high temporally- and spatially-varying backgrounds. Our approach uses $k$-means clustering to identify ... More
CAFE2: an upgrade to the CAFE high-resolution spectrograph. Commissioning results and new public pipelineJun 10 2019The Calar Alto Fiber-fed \'Echelle spectrograph (CAFE) is a high-resolution spectrographs with high-precision radial velocity capabilities mounted in the 2.2m telescope of Calar Alto Observatory. It suffered from strong degradation after 4 years of operations ... More
Shock vaporization/devolatilization of evaporitic minerals, halite and gypsum, in an open system investigated by a two-stage light gas gunJun 10 2019Dry lakebeds might constitute large volatile reservoirs on Mars. Hypervelocity impacts onto ancient dry lakebeds would have affected the volatile distribution on Mars. We developed a new experimental method to investigate the response of evaporitic minerals ... More
Modeling the light curve of `Oumuamua: evidence for torque and disc-like shapeJun 09 2019We present the first attempt to fit the light curve of the interstellar visitor `Oumuamua using a physical model which includes optional torque. We consider both conventional (Lommel-Seeliger triaxial ellipsoid) and alternative ("black-and-white ball", ... More
The ssos Pipeline: Identification of Solar System Objects in Astronomical ImagesJun 09 2019Observatories and satellites around the globe produce tremendous amounts of imaging data to study many different astrophysical phenomena. The serendipitous observations of Solar System objects are a fortunate by-product which have often been neglected ... More
A Probabilistic Approach to Kepler Completeness and Reliability for Exoplanet Occurrence RatesJun 09 2019Exoplanet catalogs produced by surveys suffer from a lack of completeness (not every planet is detected) and less than perfect reliability (not every planet in the catalog is a true planet). Occurrence rate studies of the exoplanet population structure ... More
The runaway greenhouse radius inflation effect - An observational diagnostic to probe water on Earth-size planets and test the Habitable Zone conceptJun 08 2019Planets similar to Earth - but slightly more irradiated - are expected to enter into a runaway greenhouse state, where all surface water rapidly evaporates, forming an optically thick H2O-dominated atmosphere. For Earth, this extreme climate transition ... More
Stochastic Speckle Discrimination with Time-Tagged Photon Lists: Digging Below the Speckle Noise FloorJun 07 2019We present an algorithm that uses the distribution of photon arrival times to distinguish speckles from incoherent sources, like planets and disks, in high contrast images. Using simulated data, we show that our approach can overcome the noise limit from ... More
Analysis of putative exoplanetary signatures found in light curves of two sdBV stars observed by KeplerJun 07 2019$\bf{Context}$. We investigate the validity of the claim that invokes two extreme exoplanetary system candidates around the pulsating B-type subdwarfs KIC 10001893 and KIC 5807616 from the primary $\it{Kepler}$ field. $\bf{Aims}$. Our goal was to find ... More
KELT-24b: A 5M$_{\rm J}$ Planet on a 5.6 day Well-Aligned Orbit around the Young V=8.3 F-star HD 93148Jun 07 2019We present the discovery of KELT-24 b, a massive hot Jupiter orbiting a bright (V=8.3 mag, K=7.2 mag) young F-star with a period of 5.6 days. The host star, KELT-24 (HD 93148), has a $T_{\rm eff}$ =$6508\pm49$ K, a mass of $M_{*}$ = $1.461^{+0.056}_{-0.060}$ ... More
Probing Extrasolar Planetary Systems with Interstellar MeteorsJun 07 2019The first interstellar object, `Oumuamua, was discovered in the Solar System by Pan-STARRS in 2017, allowing for a calibration of the impact rate of interstellar meteors of its size $\sim 100\;$m. The discovery of CNEOS 2014-01-08 allowed for a calibration ... More
The Degree of Alignment Between Circumbinary Disks and Their Binary HostsJun 07 2019All four circumbinary (CB) protoplanetary disks orbiting short-period ($P < 20$ day) double-lined spectroscopic binaries (SB2s)---a group that includes UZ Tau E, for which we present new ALMA data---exhibit sky-plane inclinations $i_{\rm disk}$ which ... More
Signatures of a planet-planet impacts phase in exoplanetary systems hosting giant planetsJun 07 2019Exoplanetary systems host giant planets on substantially non-circular, close-in orbits. We propose that these eccentricities arise in a phase of giant impacts, analogous to the final stage of Solar System assembly that formed Earth's Moon. In this scenario, ... More
Polarisation and Brightness Temperature Observations of Venus with the GMRTJun 07 2019Venus was observed at frequencies of 1297.67 MHz (23 cm), 607.67 MHz (49 cm) and 233.67 MHz (1.28 m) with the Giant Metrewave Radio Telescope (GMRT) during the period of 25th July and 6th September 2015 when it was close to its inferior conjunction. Values ... More
Structural study of analogues of Titan s haze by trapped ion mobility coupled with a Fourier transform ion cyclotron mass spectrometerJun 07 2019The aerosols present in the atmosphere of the Saturn s moon Titan are of particular planetary science interest and several spacecraft missions already allowed to gather spectroscopic data. Titan haze s analogs, so-called tholins, were produced on earth ... More
CO Detected in CI Tau b: Hot Start Implied by Planet Mass and M$_K$Jun 07 2019We acquired high resolution IR spectra of CI Tau, the host star of one of the few young planet candidates amenable to direct spectroscopic detection. We confirm the planet's existence with a direct detection of CO in the planet's atmosphere. We also calculate ... More
Constraining Exoplanet Metallicities and Aerosols with ARIEL: An Independent Study by the Contribution to ARIEL Spectroscopy of Exoplanets (CASE) TeamJun 06 2019Launching in 2028, ESA's Atmospheric Remote-sensing Exoplanet Large-survey (ARIEL) survey of $\sim$1000 transiting exoplanets will build on the legacies of Kepler and TESS and complement JWST by placing its high precision exoplanet observations into a ... More
The B-Star Exoplanet Abundance Study: a co-moving 16-25 Mjup companion to the young binary system HIP 79098Jun 06 2019Wide low-mass substellar companions are known to be very rare among low-mass stars, but appear to become increasingly common with increasing stellar mass. However, B-type stars, which are the most massive stars within ~150 pc of the Sun, have not yet ... More
The role of atom tunneling in gas-phase reactions in planet-forming disksJun 06 2019This paper investigates the impact of the increased reaction rate constant due to tunneling effects on planet-forming disks. Our aim is to quantify the astrophysical implications of atom tunneling for simple molecules that are frequently used to infer ... More
Simulated Phase-dependent Spectra of Terrestrial Aquaplanets in M Dwarf SystemsJun 06 2019Orbital phase-dependent variations in thermal emission and reflected stellar energy spectra can provide meaningful constraints on the climate states of terrestrial extrasolar planets orbiting M dwarf stars. Spatial distributions of water vapor, clouds, ... More
Not Gone with the Wind: Planet Occurrence is Independent of Stellar Galactocentric VelocityJun 06 2019We demonstrate that planet occurrence does not depend on stellar galactocentric velocity in the Solar neighborhood. Using Gaia DR2 astrometry and radial velocity data, we calculate 3D galactocentric velocities for 197,090 Kepler field stars, 1647 of which ... More
An analysis of binary microlensing event OGLE-2015-BLG-0060Jun 06 2019We present the analysis of stellar binary microlensing event OGLE-2015-BLG-0060 based on observations obtained from 13 different telescopes. Intensive coverage of the anomalous parts of the light curve was achieved by automated follow-up observations ... More
A Hot Saturn Near (but unassociated with) the Open Cluster NGC 1817Jun 06 2019We report on the discovery of a hot Saturn-sized planet (9.916 +/- 0.985 R_earth) around a late F star, EPIC 246865365, observed in Campaign 13 of the K2 mission. We began studying this planet candidate because prior to the release of Gaia DR2, the host ... More
Retrieval of Chemical Abundances in Titan's Upper Atmosphere from Cassini UVIS Observations with Pointing MotionJun 05 2019Cassini/UVIS FUV observations of stellar occultations at Titan are well suited for probing its atmospheric composition and structure. However, due to instrument pointing motion, only five out of tens of observations have been analyzed. We present an innovative ... More
A Pathfinder for Imaging Extrasolar Earths from the GroundJun 05 2019The Subaru Coronagraphic Extreme Adaptive Optics (SCExAO) project is an instrument on the Subaru telescope that is pushing the frontiers of what is possible with ground-based high-contrast imaging of extrasolar planets. The system features key breakthroughs ... More
Securing the legacy of TESS through the care and maintenance of TESS planet ephemeridesJun 05 2019TESS has begun fulfilling its promise of delivering thousands of new transiting planets orbiting nearby bright stars. The mission's legacy will fuel exoplanet science for many years to come, but much of this science relies on precisely predicted transit ... More
Cold Debris Disks as Strategic Targets for the 2020sJun 05 2019Cold debris disks (T$<$200 K) are analogues to the dust in the Solar System's Kuiper belt--dust generated from the evaporation and collision of minor bodies perturbed by planets, our Sun, and the local interstellar medium. Scattered light from debris ... More
Colors of Trans-Neptunian Contact BinariesJun 05 2019The g'r'i' colors of seven likely and potential contact binaries in the Kuiper belt were acquired with the Magellan-Baade telescope and combined with colors from the literature to understand contact binary surfaces. The likely and potential contact binaries ... More
Constraining the properties of HD 206893 B. A combination of radial velocity, direct imaging, and astrometry dataJun 05 2019High contrast imaging enables the determination of orbital parameters for substellar companions (planets, brown dwarfs) from the observed relative astrometry and the estimation of model and age-dependent masses from their observed magnitudes or spectra. ... More
Constraining the properties of HD 206893 B. A combination of radial velocity, direct imaging, and astrometry dataJun 05 2019Jun 07 2019High contrast imaging enables the determination of orbital parameters for substellar companions (planets, brown dwarfs) from the observed relative astrometry and the estimation of model and age-dependent masses from their observed magnitudes or spectra. ... More
Small Planets in the Galactic Context: Host Star Kinematics, Iron, and $α$ Element EnhancementJun 05 2019We explored the occurrence rate of small close-in planets among $\textit{Kepler}$ target stars as a function of the iron abundance and the stellar total velocity $V_\mathrm{tot}$. We estimated the occurrence rate of those planets by combining information ... More
The Measured Impact of Chromatic Atmospheric Effects on Barycentric Corrections: Results from the EXtreme PREcision SpectrographJun 04 2019One source of error in high-precision radial velocity measurements of exoplanet host stars is chromatic change in Earth's atmospheric transmission during observations. Mitigation of this error requires that the photon-weighted barycentric correction be ... More
Dust Production of Comet 21P/Giacobini-Zinner Throughout its 2018 ApparitionJun 04 2019We present the results of a long term telescopic observation campaign of comet 21P/Giacobini-Zinner, parent body of the Draconid meteor shower, spanning $\sim 240$ days during its 2018 apparition. Determinations of comet 21P's dust production rate through ... More
Dust Production of Comet 21P/Giacobini-Zinner Throughout its 2018 ApparitionJun 04 2019Jun 07 2019We present the results of a long term telescopic observation campaign of comet 21P/Giacobini-Zinner, parent body of the Draconid meteor shower, spanning $\sim 240$ days during its 2018 apparition. Determinations of comet 21P's dust production rate through ... More
Two accreting protoplanets around the young star PDS 70Jun 04 2019Newly forming proto-planets are expected to create cavities and substructures in young, gas-rich proto-planetary disks, but they are difficult to detect as they could be confused with disk features affected by advanced image-analysis techniques. Recently, ... More
Introduction of water-vapor broadening coefficients and their temperature dependence exponents into the HITRAN database, Part I: CO2, N2O, CO, CH4, O2, NH3, and H2SJun 04 2019The amount of water vapor in the terrestrial atmosphere is highly variable both spatially and temporally. In the tropics it sometimes constitutes 4-5% of the atmosphere. At the same time collisional broadening of spectral lines by water vapor is much ... More
Observability of Forming Planets and their Circumplanetary Disks III. -- Polarized Scattered LightJun 04 2019There are growing amount of very high-resolution polarized scattered light images of circumstellar disks. Naturally, the question arises whether the circumplanetary disk forming around nascent planets can be detected with the same technique. Here we created ... More
ISPY - NaCo Imaging Survey for Planets around Young stars - Discovery of an M dwarf in the gap between HD 193571 and its debris ringJun 04 2019Context. The interaction between low-mass companions and the debris discs they reside in is still not fully understood. A debris disc can evolve due to self-stirring, a process in which planetesimals can excite their neighbours to the point of destructive ... More
Multipoint study of successive coronal mass ejections driving moderate disturbances at 1 AUJun 04 2019We analyse in this work the propagation and geoeffectiveness of four successive coronal mass ejections (CMEs) that erupted from the Sun during 21--23 May 2013 and that were detected in interplanetary space by the Wind and/or STEREO-A spacecraft. All these ... More
Typical Climate Perturbations Unlikely to Disrupt Gaia HypothesisJun 03 2019The Gaia hypothesis postulates that life regulates its environment to be favorable for its own survival. Most planets experience numerous perturbations throughout their lifetimes such as asteroid impacts, volcanism, and the evolution of a star's luminosity. ... More
Photometric observations of the asteroid 3200 Phaethon using small and middle telescopesJun 03 2019The main aim of photometrical observations of the asteroid 3200 Phaethon was searching for its low-level cometary activity (possible coma and/or dust tail) in the pre-perihelion passage. We performed observational runs with telescopes ranging from 0.61-m ... More
Dealing With $δ$-Scuti Variables: Transit Light Curve Analysis of Planets Orbiting Rapidly-Rotating, Seismically Active A/F StarsJun 03 2019We measure the bulk system parameters of the seismically active, rapidly-rotating $\delta$-Scuti KOI-976 and constrain the orbit geometry of its transiting binary companion using a combined approach of asteroseismology and gravity-darkening light curve ... More
Wotan: Comprehensive time-series de-trending in PythonJun 03 2019The detection of transiting exoplanets in time-series photometry requires the removal or modeling of instrumental and stellar noise. While instrumental systematics can be reduced using methods such as pixel level decorrelation, removing stellar trends ... More
Wotan: Comprehensive time-series de-trending in PythonJun 03 2019Jun 13 2019The detection of transiting exoplanets in time-series photometry requires the removal or modeling of instrumental and stellar noise. While instrumental systematics can be reduced using methods such as pixel level decorrelation, removing stellar trends ... More
In-flight photometry extraction of PLATO targets: Optimal apertures for detecting extrasolar planetsJun 03 2019The ESA PLATO space mission is devoted to unveiling and characterizing new extrasolar planets and their host stars. This mission will encompass a very large field of view, granting it the potential to survey up to one million stars depending on the final ... More
Using Dust Shed from Asteroids as Microsamples to Link Remote Measurements with Meteorite ClassesJun 03 2019Given the compositional diversity of asteroids, and their distribution in space, it is impossible to consider returning samples from each one to establish their origin. However, the velocity and molecular composition of primary minerals, hydrated silicates, ... More
The onset and growth of the 2018 Martian Global Dust StormJun 03 2019We analyze the onset and initial expansion of the 2018 Martian Global Dust Storm (GDS 2018) using ground-based images in the visual range. This is the first case of a confirmed GDS initiating in the Northern Hemisphere. A dusty area extending about 1.4x10e5 ... More
A pebble-driven formation model for compact planetary systems like TRAPPIST-1Jun 03 2019Recently, seven Earth-sized planets were discovered around the M-dwarf star TRAPPIST-1. Thanks to transit-timing variations, the masses and therefore the bulk densities of the planets have been constrained, suggesting that all TRAPPIST-1 planets are consistent ... More
Two new HATNet hot Jupiters around A stars, and the first glimpse at the occurrence rate of hot Jupiters from TESSJun 02 2019Wide field surveys for transiting planets are well suited to searching diverse stellar populations, enabling a better understanding of the link between the properties of planets and their parent stars. We report the discovery of HAT-P-69 b (TOI 625.01) ... More
Dust Condensation in Evolving Discs and the Composition of Meteorites, Planetesimals, and PlanetsJun 02 2019Partial condensation of dust from the Solar nebula is thought to be responsible for the diverse chemical compositions of the rocky planets/planetesimals in the inner Solar system. Here we present a forward physical-chemical model of a protoplanetary disc ... More
Effects of Radiation Pressure on the Evaporative Wind of HD 209458bMay 31 2019The role of radiation pressure in shaping exoplanet photoevaporation remains a topic of contention. Radiation pressure from the exoplanet's host star has been proposed as a mechanism to drive the escaping atmosphere into a "cometary" tail and explain ... More
Effects of Radiation Pressure on the Evaporative Wind of HD 209458bMay 31 2019Jun 06 2019The role of radiation pressure in shaping exoplanet photoevaporation remains a topic of contention. Radiation pressure from the exoplanet's host star has been proposed as a mechanism to drive the escaping atmosphere into a "cometary" tail and explain ... More
Not a simple relationship between Neptune's migration speed and Kuiper belt inclination excitationMay 31 2019We present numerical simulations of giant planet migration in our solar system and examine how the speed of planetary migration affects inclinations in the resulting population of small bodies (test particles) scattered outward and subsequently captured ... More
Migration of D-type asteroids from the outer Solar System inferred from carbonate in meteoritesMay 31 2019Recent dynamical models of Solar System evolution and isotope studies of rock-forming elements in meteorites have suggested that volatile-rich asteroids formed in the outer Solar System beyond Jupiter's orbit, despite being currently located in the main ... More
The Orbit and Size-Frequency Distribution of Long Period Comets Observed by Pan-STARRS1May 31 2019We introduce a new technique to estimate the comet nuclear size frequency distribution (SFD) that combines a cometary activity model with a survey simulation and apply it to 150 long period comets (LPC) detected by the Pan-STARRS1 near-Earth object survey. ... More
Earth's Minimoons: Opportunities for Science and TechnologyMay 31 2019(modified from published version) Twelve years ago the Catalina Sky Survey discovered Earth's first known natural geocentric object other than the Moon, a few-meter diameter asteroid designated 2006 RH120. Despite significant improvements in ground-based ... More
A New Two-Molecule Combination Band as Diagnostic of Carbon Monoxide Diluted in Nitrogen Ice On TritonMay 30 2019A combination band due to a mechanism whereby a photon excites two or more vibrational modes ({\it e.g.} a bend and a stretch) of an individual molecule is commonly seen in laboratory and astronomical spectroscopy. Here, we present evidence of a much ... More
High order regularised symplectic integrator for collisional planetary systemsMay 30 2019We present a new mixed variable symplectic (MVS) integrator for planetary systems, that fully resolve close encounters. The method is based on a time regularisation that allows keeping the stability properties of the symplectic integrators, while also ... More
Study of the Mass-Ratio Distribution of Spectroscopic Binaries. II. The Boundaries of the Brown-Dwarf Desert as Seen with the APOGEE Spectroscopic BinariesMay 30 2019Analysis of APOGEE DR12 stellar radial-velocities by Troup et al. (2016) affirmed the existence of the well-known Brown-Dwarf Desert (BDD). They detected a dearth of spectroscopic binaries (SB) with periods shorter than $\sim 10$ - $30$ days and secondaries ... More
Streaming Instability for Particle-Size DistributionsMay 30 2019Jun 10 2019The streaming instability is thought to play a central role in the early stages of planet formation by enabling the efficient bypass of a number of barriers hindering the formation of planetesimals. We present the first study exploring the efficiency ... More
Streaming Instability for Particle-Size DistributionsMay 30 2019The streaming instability is thought to play a central role in the early stages of planet formation by enabling the efficient bypass of a number of barriers hindering the formation of planetesimals. We present the first study exploring the efficiency ... More
ALMA observations require slower Core Accretion runaway growthMay 30 2019Thanks to recent high resolution ALMA observations, there is an accumulating evidence for presence of giant planets with masses from $\sim 0.01$ Jupiter mass to a few Jupiter mass with separations up to $ 100$~AU in the annular structures observed in ... More
Near-Earth asteroids spectroscopic survey at Isaac Newton TelescopeMay 30 2019Jun 04 2019The population of near-Earth asteroids (NEAs) shows a large variety of objects in terms of physical and dynamical properties. They are subject to planetary encounters and to strong solar wind and radiation effects. Their study is also motivated by practical ... More
Near-Earth asteroids spectroscopic survey at Isaac Newton TelescopeMay 30 2019The population of near-Earth asteroids (NEAs) shows a large variety of objects in terms of physical and dynamical properties. They are subject to planetary encounters and to strong solar wind and radiation effects. Their study is also motivated by practical ... More
Revised description of dust diffusion and a new instability creating multiple rings in protoplanetary disksMay 30 2019Various instabilities have been proposed as a promising mechanism to accumulate dust. Moreover, some of them are expected to lead to the multiple-ring structure formation and the planetesimal formation in protoplanetary disks. In a turbulent gaseous disk, ... More
Observing Isotopologue Bands in Terrestrial Exoplanet Atmospheres with the James Webb Space Telescope---Implications for Identifying Past Atmospheric and Ocean LossMay 30 2019Terrestrial planets orbiting M dwarfs may soon be observed with the James Webb Space Telescope (JWST) to characterize their atmospheric composition and search for signs of habitability or life. These planets may undergo significant atmospheric and ocean ... More
Reflected Light Phase Curves in the TESS EraMay 29 2019The reflected light signal from a planet throughout its orbit is a powerful probe of a planet's atmospheric properties. There are a number of planets that are amenable to reflected light phase curve studies with present and future space-based instrumentation ... More
Planet-forming material in a protoplanetary disc: the interplay between chemical evolution and pebble driftMay 29 2019The composition of gas and solids in protoplanetary discs sets the composition of planets that form out of them. Recent chemical models have shown that the composition of gas and dust in discs evolves on Myr time-scales, with volatile species disappearing ... More