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the events observed by ligo indicate the existence of a large population of intermediate mass black holes. this unexpected result lead to a resurgence in the interest in theories of the formation of primordial black holes with several studies showing that broad mass distributions can evade or satisfy the stringent cons... | probing quantum gravity using high-energy astrophysics |
long-duration gamma-ray bursts (long-grbs) can be detected throughout cosmic history and provide several unique insights into star-formation and galaxy evolution back to the era of reionization. they can be used to map star formation, identify galaxies across the luminosity function, determine detailed abundances even ... | theseus and the high redshift universe |
within the scientific goals of the theseus esa/m5 candidate mission, a critical item is a fast (within a few s) and accurate (<15 arcmin) gamma-ray burst and high-energy transient location from a few kev up to hard x-ray energy band. for that purpose, the signal multiplexing based on coded masks is the selected opti... | the xgis imaging system onboard the theseus mission |
the lambdacdm model is the most commonly accepted framework in modern cosmology. however, the local measurements of the hubble constant, h0, via the supernovae type ia (sne ia) calibrated on cepheids provide a value which is in significant disagreement, from 4 to 6 sigma, with the value of h0 inferred from the cosmic m... | supernovae ia and gamma-ray bursts together shed new lights on the hubble constant tension and cosmology |
recent observations provide compelling evidence that the bulk of the high energy cosmic rays (crs) and gamma-ray bursts (grbs) are co-produced by highly relativistic jets of plasmoids of stellar matter. these jets are launched by fall back matter on newly born neutron stars and stellar black holes in core collapse of s... | solution to the cosmic rays puzzle ? |
the cherenkov telescope array (cta) is a next generation ground-based very-high-energy gamma-ray observatory that will allow for observations in the >10 gev range with unprecedented photon statistics and sensitivity. this will enable the investigation of the yet-marginally explored physics of short-time-scale transi... | the cherenkov telescope array transient and multi-messenger program |
gamma-ray bursts (grbs) are distant, extremely energetic, short (about 0.1-1000 sec) cosmic transients, which could sample the whole observable universe. two of the gamma-ray bursts' important properties are the duration and the distance of the burst. we analyzed these two important quantities of the phenomena. we mapp... | gamma-ray bursts' redshift distribution's dependence on their duration |
the upcoming gamma-400 experiment will be implemented aboard the russian astrophysical space observatory, which will be operating in a highly elliptical orbit over a period of 7 years to provide new data on gamma-ray emissions and cosmic-ray electron + positron fluxes, mainly from the galactic plane, the galactic cente... | the upcoming gamma-400 experiment |
we present a pilot search of co emission in three h2-absorbing, long-duration gamma-ray burst (grb) host galaxies at z ~ 2-3. we used the atacama large millimeter/submillimeter array (alma) to target the co(3 - 2) emission line and report non-detections for all three hosts. these are used to place limits on the host mo... | grb host galaxies with strong h2 absorption: co-dark molecular gas at the peak of cosmic star formation |
the 10-meter south pole telescope (spt) recently started an untriggered millimeter-wave transient search, revealing several exciting candidates for high-energy transient signals such as gamma ray burst (grb) afterglows and flaring variable stars. though it has long been known that astrophysical transients are detectabl... | first millimeter wavelength transient candidates from the spt-3g survey |
we present the results of modeling and simulating the hamamatsu r5912 photomultiplier tube that is used in most of the sites of the latin american giant observatory (lago). the model was compared with data of in-operation water cherenkov detectors (wcd) installed at bucaramanga-colombia and bariloche-argentina. the lag... | modeling and simulation of the r5912 photomultiplier for the lago project |
the extreme universe space observatory on a super pressure balloon 2, euso spb2, mission was designed to take optical measurements of extensive air showers, eass, from suborbital space. the euso spb2 payload includes an optical cherenkov telescope, ct, which searches above and below the earth's limb. above the limb, th... | the targets of opportunity source catalog for the euso-spb2 mission |
short gamma-ray bursts (sgrbs) are explosive transients that can be seen at cosmological distances. they have been confirmed to be driven by compact object mergers and to produce kilonovae, the radioactive signature of heavy element nucleosynthesis. sgrbs are therefore valuable markers for r-process enrichment througho... | the origins of hostless short gamma-ray bursts |
the recent status of the european space agency's (esa) theseus (transient high‑energy sources and early universe surveyor) project and the recent and expected czech participation in this project are briefly presented and discussed. theseus is a mission concept proposed in response to the esa's call for medium‑size miss... | esa theseus and czech participation |
the infra-red telescope (irt) is part of the payload of the theseus mission, which is one of the two esa m5 candidates within the cosmic vision program, planned for launch in 2032. the theseus payload, composed by two high energy wide field monitors (sxi and xgis) and a near infra-red telescope (irt), is optimized to d... | the infra-red telescope (irt) on board the theseus mission |
the metallicity of galaxies across cosmic epoch is a pillar of galaxy evolution models. jwst aims to revolutionise metallicity determinations of distant and fainter populations of galaxies that have been out of reach with current technology, to trace the history of cosmic chemical enrichment and its relation to star fo... | mapping emission and absorption line metallicities onto the same univeral scale |
i will present an overview of recent results on the growth of supermassive black holes and agn feedback from the fire zoom-in simulations of galaxy formation. the fire simulations include resolved ism physics and feedback from all the main known stellar processes (core collapse and type ia supernovae; winds from young ... | agn fueling and feedback in the fire cosmological zoom-in simulations |
we constrain a broad class of "hairy" black hole models capable of directly sourcing electromagnetic radiation during a binary black hole merger. this signal is generic and model-independent since it is characterized by the black hole mass (m ) and the fraction of that mass released as radiation (ε ). for field energy ... | constraining electromagnetic signals from black holes with hair |
this paper describes the methods and results for the localization by triangulation of cosmic gamma-ray bursts (grbs) independently observed by two space experiments: the mercury gamma-ray and neutron spectrometer (mgns) and the high energy neutron detector (hend). mgns is onboard the mpo/bepicolombo mission and on a st... | localization of cosmic gamma-ray bursts in interplanetary space with mgns/bepicolombo and hend/mars odyssey experiments |
the physics governing the production of the prompt emission of gamma‑ray bursts (grbs) is still poorly understood. the prompt emission is usually caught by a wide field of view gamma‑ray instruments in the range of 10 kev-10 mev, but to date, at higher energies, it has not been detected yet. here, we investigate multi-... | detection perspectives for prompt very-high-energy emission from gamma-ray bursts |
polar-2, a plastic scintillator based compton polarimeter, is currently under development and planned for a launch to the china space station in 2025. it is intended to shed a new light on our understanding of gamma-ray bursts by performing high precision polarization measurements of their prompt emission. the instrume... | proton irradiation of plastic scintillator bars for polar-2 |
fast radio bursts (frbs) are millisecond transient radio events with a high energy. by identifying the origin of the burst, it is possible to measure the redshift of the host galaxy, which can be used to constrain cosmological and astrophysical parameters and test aspects of fundamental physics when combined with the d... | forecasting constraints on the baryon mass fraction in the igm from fast radio bursts and type ia supernovae |
quasi-periodic eruptions (qpes) are a new kind of cosmic signal brightening up the x-ray sky. discovered serendipitously at the end of 2018 and observed in the nuclei of five galaxies so far, qpes are intense and rapid bursts of soft x-ray emission over a stable level of quiescence, which repeat quasi-periodically ever... | x-ray quasi periodic eruptions from massive black holes |
gamma-ray burst grb221009a was of unprecedented brightness in the γ-rays and x-rays through to the far ultraviolet, allowing for identification within a host galaxy at redshift z=0.151 by multiple space and ground-based optical/near-infrared telescopes and enabling a first association—via cosmic-ray air-shower events—w... | holographic quantum-foam blurring is consistent with observations of gamma-ray burst grb221009a |
joseph samuelovich shklovsky was born in the town of glukhov in ukraine. in 1933 he entered the physicsmath department of vladivostok university and two years later transferred to the physics department of moscow university (mgu). in 1938 this young physicist-optician was accepted as a graduate student by the astrophys... | the shklovsky phenomenon |
relativistic image doubling (rid) is an unusual effect where relativistic motion causes particles, shadows, and illumination fronts to appear doubled. rid effects occur all around us every day, but on human scales occur so fast they are difficult to notice. recent refereed publications have demonstrated that rid might ... | astrophysically relevant examples of relativistic image doubling |
excursions in the radiocarbon (14c) record, which are rapid changes on a scale of a few years are presumed to be caused by an increase of incoming cosmic rays. the excursions at ad 774-775ad and 993-994ad have generated widespread interest and have been reproduced in many different tree-ring records (miyake et al. 2012... | evidence for solar-flare and other cosmic-ray events in the 14c record in tree rings: new information and a cautionary tale. |
the transient high-energy sky and early universe surveyor (theseus) is a space mission concept currently under phase a study by esa as candidate m5 mission, aiming at exploiting gamma-ray bursts for investigating the early universe and at providing a substantial advancement of multi-messenger and time-domain astrophysi... | the transient high energy sky and early universe surveyor (theseus) |
the interaction of the jovian magnetosphere with europa has been a subject of active research during the last few decades both through in-situ and remote sensing observations as well as theoretical considerations. linking the magnetosphere and the moon's surface and interior, europa's exosphere has become one of the pr... | ion and neutral populations in europa's exosphere |
rhea is the second largest icy satellite of saturn and it is mainly composed of water ice. its surface is characterized by a leading hemisphere slightly brighter than the trailing side, a common characteristic across saturn' mid-sized satellites. the leading/trailing asymmetry arises because of two different surface al... | mapping sub-micon ice grains on rhea |
saturn's largest moon, titan has been in the spotlight of planetary research for seven decades now. this unique satellite is the only other planetary body besides the earth to possess a substantial n2 dominated atmosphere, and stable bodies of liquids on its surface. the atmosphere and the surface are strongly coupled,... | titan's modeled thermospheric composition sensitivity to solar cycle and cross section resolution |
the earth's inner core is a surprisingly complex region of our planet. simple models of inner core solidification and evolution would lead us to expect a layered structure, which has "frozen in" in information about the state of the core at the time of solidification. however, seismic observations of earth's inner core... | inner core imaging using p'p' |
circumstellar debris disks are generated by the collisions and evaporation of planetesimals, the leftover building blocks of planets. they are usually composed of multiple rings of dust, but most emit most strongly in the far-infrared at wavelengths around 50 microns. despite years of work with iras, spitzer, and hersc... | essential properties of new debris disks |
enceladus has a complicated geological history, dominated by partial resurfacing episodes (spencer and nimmo, eps, 2013). the south polar terrain (spt) is the youngest form of these resurfacing episodes, as it is currently active; however there is also evidence for past partial resurfacing in the leading and trailing h... | constraining the ice viscosity and heat flux on enceladus during the formation of the leading hemisphere |
we report on the detection of protons and the potential detection of h2+ between saturn's f and g rings based on cassini plasma spectrometer (caps) ion mass spectrometer (ims) time-of-flight (tof) composition measurements acquired in this region during saturn orbit insertion (soi). all previous studies of this region h... | the plasma proton environment within saturns f-g ring gap as observed by the cassini plasma spectrometer ion mass spectrometer during saturn orbit insertion |
titan, saturn"s largest moon, has long been known to harbor a thick atmosphere [1] that evolves a complex array of organic molecules through atmospheric photochemistry [2, 3]. especially from the 1970s onwards, successive waves of investigation with ground-based telescopes, spacecraft including voyager 1 and cassini-hu... | detection of cyclopropenylidene on titan |
in 2014, the discovery of two well-defined rings around the centaur (10199) chariklo were announced. this was the first time that such structures were found around a small body. in 2015, it was proposed that the centaur (2060) chiron may also have a ring. in a previous study, we analyzed how close encounters with giant... | rings under close encounters with the giant planets: chariklo vs chiron |
the topographic information provided by cassini radar altimetry, sar topography, and stereo radargrammetry has opened new doors for titan research by allowing the quantitative analysis of morphologic form. using these datasets, we investigate the three-dimensional morphology of titan's lacustrine basins in order to add... | topographic constraints on the evolution and connectivity of titan's lacustrine basins |
we use extreme ultraviolet (euv) measurements of solar irradiance from goes satellites to derive daily hydrogen (h) density distributions of the terrestrial upper atmosphere. goes satellites are in geostationary orbit and measure solar irradiance in a wavelength band around the lyman-alpha line. when the satellite is o... | exospheric hydrogen density estimates from absorption dips in goes solar irradiance measurements |
the dawn framing camera has revealed numerous domical to conical features on ceres, which may have relevance to the presence and history of near-surface ice. these features fall into two broad classes, large domes 10s to >100 km in diameter exhibiting 1-5 km of positive relief, and small mounds <10 km in diameter... | origin hypotheses for kilometer-scale mounds on dwarf planet ceres |
in analyzing the cassini data between saturn's a-ring outer edge and mimas' l shell numerous inconsistencies have been reported in estimates of total ionic charge and electron density. the primary focus of our work is to understand these inconsistencies. we present our recent discovery of plasma protons during saturn o... | the plasma proton environment within saturn's inner magnetosphere as observed by the cassini plasma spectrometer (caps) during saturn orbit insertion |
when observed at visible and near-infrared wavelengths, the saturnian system of satellites and rings evidences significant variations in surface composition, roughness, and regolith grain size. the composition of these objects appears dominated by water ice mixed with smaller quantities of chromophores (organics and ir... | the distribution of ices and chromophores across saturn's satellites and ring system |
we study the plasma interactions of galilean satellites, io and europa, by means of multi-species global hybrid simulations. for both satellites we consider multi-species background plasma composed of oxygen and sulphur ions and multi-component neutral atmospheres. we consider ionization processes of the neutral atmosp... | multi-species hybrid modeling of plasma interactions at io and europa |
the most abundant group of planktonic archaea , the so-called thaumarchaeota, represents 20% of all marine planktonic microorganisms (karner et al., 2001) and their energy efficient performance of nitrification makes them key players in the global nitrogen- and carbon-cycle (könneke et al., 2014). furthermore, plankton... | public aquaria as long-term enrichments for investigating planktonic archaea |
the chicxulub impact structure, located in the northern yucatan peninsula, mexico, formed 66 my ago, was drilled by iodp-icdp 364 expedition in april-may, 2016. a continuous core was successfully recovered from the peak ring from depth between 505.7 and 1334.7 mbsf. in order to determine the distribution and abundance ... | highly siderophile elements and os isotope signatures in the k-pg transition of the chicxulub peak-ring rocks |
observationally locating the position of the h2o snowline (e.g., hayashi et al. 1981, 1985) in protoplanetary disks is crucial for understanding the dust evolution and planet formation processes, and the origin of water on the earth. the velocity profiles of emission lines from disks are usually affected by doppler shi... | water and 13c17o lines, and multiple ring and gap structures of the protoplanetary disk around hd 163296 observed by alma |
titan has an abundance of lakes and seas, as identified by the cassini spacecraft. major components of these liquid bodies include methane (ch4) and ethane (c2h6), however minor constituents are also thought to exist (e.g. ethylene (c2h4)). as the lakes and seas evaporate, 5-μm-bright deposits, resembling evaporite dep... | experimental simulations of ethylene evaporites on titan |
uranus is surrounded by a complex ring system that includes a variety of tenuous structures composed primarily of dust-sized particles. these dusty rings were first seen in images obtained by the voyager 2 spacecraft, but several of them were thought to only be detectable in a single voyager image. it has therefore bee... | new information about uranus' dusty rings from voyager 2 images |
the availability of thermal vacuum chambers (tvc) represents a need in todaýs planetary research. a tvc must be capable of operate under representative conditions (temperature, gas composition, pressure, radiation flux …) of space exploration targets, but also have an useful volume compatible with the performing experi... | a multipurpose thermal vacuum chamber for planetary research compatible with stand-off laser spectroscopies |
at io and europa, the interaction of the jovian plasma with the moon atmosphere leads to a significant loss of atomic/molecular neutrals and ions to space. the processes that lead to atmospheric escape are diverse: atmospheric sputtering, molecular dissociation, molecular ion recombination, jeans escape etc. each proce... | comparing the atmospheric losses at io and europa |
organic molecules are ubiquitous in primitive solar system bodies such as comets and could be a major component of the icy moons, and dwarf planets [1]. primitive organic molecules (om) may have formed in the interstellar medium (ism) and in the protoplanetary disk (ppd) before being accreted in the building blocks of ... | fate of primitive organic matter during icy moons' geological evolution |
the narrow main rings of uranus are composed of primarily centimeter- to meter-sized particles, with a very small or nonexistent dust component. this property presents a challenge to visible and near-infrared instruments observing the rings, which are largely unable to differentiate large particles from dust; thus, the... | thermal measurements of the ring system of uranus |
we have performed an analysis of over 500 images returned by new horizons' lorri visible-light camera during the 2007 flyby of jupiter. we find that: - radial profiles from new horizons give unprecedented insight into the ring's structure. the main ring is clearly subdivided into three distinct and complete rings. thes... | new horizons imaging of jupiter's main ring |
enceladus' subsurface ocean is a possible abode for life, but it is inaccessible with current technology. however, icy particles and vapor are being expelled into space through surface fractures known as tiger stripes, forming a large plume centered in the south polar terrains. direct chemical analyses by cassini have ... | the enceladus ionizing radiation environment: implications for biomolecules |
starting in april 2017, the hill sphere of the directly-imaged planet beta pic b will start to transit its host-star, beta pic. during this event, material in the hill sphere (e.g. left-over debris from planet formation, rings, gas torus around satellites, etc.) could transit the star. photometric data from 1981, durin... | observing the beta pic hill sphere transit in the far-uv |
it is widely known that titan is the only body in the solar system, other than earth, that has an abundant liquid phase on its surface. its liquid composition has been derived from thermodynamic models that assume equilibrium between liquid and the atmosphere. efforts to obtain composition data of titan's lakes have be... | cryochem modeling of titan's liquid: the effects of hydrogen cyanide (hcn) |
the inner moons of saturn - mimas, enceladus, tethys, dione and rhea - exhibit remarkable large-scale albedo and color variations. these trends can be linked to a combination of the unique exogenic processes occurring the saturn system, including e-ring grain bombardment and charged particle bombardment. one of the fas... | investigating saturn's icy moons using hst/stis |
sand seas on titan may reflect the present and past climatic conditions. understanding the morphodynamics and physicochemical properties of titan's dunes is therefore essential for a better comprehension of the climatic and geological history of the largest saturn's moon. we derived quantitatively surface properties (t... | backscatter modelling and inversion from cassini/sar data: implications for titan's sand seas properties and climatic conditions |
introduction with 13 years of observations, the ion and neutral mass spectrometer (inms) onboard the cassini spacecraft has observed the upper atmosphere of titan through two seasons: winter and spring. the complex atmosphere is mainly composed of n2, ch4, h2 and ar, but a lot more carbon and nitrogen bearing trace spe... | seasonal variation of trace species in titan's ionosphere |
a review of 150 publications on the subsurface microbiology of the continental subsurface provides ~1,400 measurements of cellular abundances down to 4,800 meter depth. these data suggest that the continental subsurface biomass is comprised of ~1016-17 grams of carbon, which is higher than the most recent estimates of ... | biogenic carbon on mars: a subsurface chauvinistic viewpoint |
a scheme of the modified method of round gaussian rings, designed to study the secular evolution of orbits in systems consisting of a central star and two planets, is presented. the reason for the secular evolution of the nodes and inclinations of the orbits of the planets is their mutual gravitational attraction. the ... | modified method of round gaussian rings. application to the two-planetary problem |
we present analysis of global 3-dimensional multi-species hybrid simulations of io's interaction with jovian magnetospheric plasma. in the multi-species simulations we assume five species, plasma torus is composed of o+, s+ and s++ ions and ions of so+, so2+ are created around io by ionization of its neutral atmosphere... | plasma interaction at io: multi-species hybrid simulations |
the organic haze that surrounds saturn's moon titan is formed through the photolysis and electron initiated dissociation of methane and nitrogen. the chemical pathways leading to haze formation and the resulting haze optical properties are still highly uncertain. here we examine the compositional and optical properties... | compositional and optical properties of titan haze analogs using aerosol mass spectrometry, photoacoustic spectroscopy and cavity ring-down spectroscopy |
our understanding of how exoplanets form and evolve relies on analyses of both the mineralogy of protoplanetary disks and their detailed structures; however, these key complementary aspects of disks are usually studied separately. we present initial results from a hybrid model that combines the empirical characterizati... | the earth disk model: analysis and integration of protoplanetary disk mineralogy and structure |
the cassini mission is now heading into its last year of observations. part of the mission plan includes orbits that bring the spacecraft close to saturn's rings prior to deorbiting into saturn's atmosphere. first, a series of f-ring orbits will cross the ring plane just outside of the f-ring, and then a series of prox... | cassini radar backscatter measurements of saturn rings |
the coupling of macroscopic charge carriers (dust) in plasmas to electric and magnetic fields plays a critical role in shaping the size and spatial distribution of these particles. planetary rings, noctilucent clouds, and comets are all examples where dusty plasma effects have been suggested to explain a number of obse... | laboratory measurements of dust charging in flowing plasmas |
super-puffs are a distinct class of low mass, large radii planets that challenge models of planet formation and evolution. their inferred large gas mass fractions suggest that they formed at large semi-major axes, beyond the water iceline, and migrated to their current locations among the similar-mass but much more abu... | unveiling the nature of the impossible planets |
while β pictoris is known to host silicates in ring-like structures, whether the properties of these silicates vary with stellocentric distance remain a question. we re-analyze the spitzer infrared spectrograph (irs) β pic debris disk data and a new irtf/spex spectrum to investigate trends in fe/mg ratio, shape, and cr... | trends in silicates in the β pictoris disk |
large, multiring impact basins on mars and other rocky planetary surfaces affect the broad-scale structural framework of the upper crust of these bodies. although they exhibit varying degrees of modification and degradation, as many as seven ring structures have been proposed for the hellas impact structure, including ... | regional compositional trends in the circum-isidis and hellas regions |
starting in april 2017, the hill sphere of the directly-imaged planet beta pic b will start to transit its host-star, beta pic. during this event, material in the hill sphere (e.g. left-over debris from planet formation, rings, gas torus around satellites, etc.) could transit the star. photometric data from 1981, durin... | observing the beta pic hill sphere transit in the far-uv |
to show how saturn could create rings due to own magnetic field we suggest additional mechanism of magnetic anisotropic accretion. so, the angular momentum conservation within gravitational interaction is not only reason for collision-induced flattening of the spinning cloud of particles around saturn. may be earlier n... | how saturn could create rings by itself. the role of the third force of diamagnetic expulsion and the mechanism of the magnetic anisotropic accretion |
salt rich ice particles within enceladus plume and saturns e-ring are ejected into space through fractures in the moons south polar region. they probably originate from frozen aerosolized droplets of enceladus salty subsurface ocean and are therefore believed to reflect the ocean waters composition [1]. in situ mass sp... | compositional heterogeneity of salt-rich grains emitted from enceladus subsurface ocean |
planets form and obtain their compositions in dust- and gas-rich disks around young stars. this process is intimately connected to the spatial arrangement of disk material. while dust substructure at the 1-10 au scale is commonly seen in these disks, but far fewer observations have probed gas substructure at similar sc... | the chemistry of planet formation: chemical substructures at 10 au scales in protoplanetary disks from the alma maps large program |
the atacama large millimeter array (alma) is revolutionising our view of planet formation. the high angular resolution campaigns are revealing that protoplanetary disks are highly sub-structured with the dust particles concentrated often in concentric rings, separated by gaps (regions of low dust surface density). on t... | the interplay of gas, dust and ice in protoplanetary disks |
before the age of space exploration, astronomers were limited to earth-based telescopes to understand the composition and physical nature of celestial bodies. through clever techniques – viewing different planetary longitudes, or observing at a variety of solar illumination angles, for example – planetary scientists we... | from pinpoints of light to geologic worlds: the magic of photometry |
within the next decade, humans are slated to return to the moon via nasa's artemis program. a driving goal of this program is to establish a sustained presence at one or more sites near the lunar south pole. artemis astronauts are expected to participate in a diverse suite of scientific investigations, many of which le... | insights into lunar differentiation, evolution, and chronology from the artemis program |
more than a decade after the arrival of the cassini-huygens mission in saturn's system, data returned by the huygens probe during its descent remain a unique source of in-situ information on the lower atmosphere of titan. among the huygens instrumental suite was the gcms (gas chromatograph mass spectrometer) instrument... | methane vertical profile in titan's atmosphere |
the 27 moons of uranus (figure 1) are enigmatic and remain poorly understood. voyager 2 flew by the uranus system in 1986, collecting fascinating images of its five largest, tidally-locked `classical' moons (figure 2), while also discovering a bevy of small moons nestled in its ring system (e.g., [1]) (figure 3). the s... | the moons of uranus: five candidate ocean worlds and a bevy of small satellites in an ice giant system |
gravitational microlensing is a unique tool for detecting and studying cold exoplanets of masses in the range earth to jupiter, orbiting any kind of star or stellar remnant all the way to the galactic bulge. it requires a less than ~1 mas alignment of the lens star with a distant background source star in order for the... | precise mass measurement of planetary system hosting a saturn orbiting an m-dwarf |
the universe is filled with planetary systems, as recent detections of exo-planets have shown. such systems grow out of disks of gas and dust that surround newly formed stars. the ground work for our understanding of the structure, composition, and evolution of such disks has been laid with infrared telescopes in the 1... | alma observations of protoplanetary disks |
saturn's ring particles are roughly centimeter to several-meter-sized objects that are covered with a regolith of icy grains. in general the composition of the regolith of an object can be investigated by comparing photometric models to reflectance spectra of the surface. however, since the rings as a whole are not a s... | light scattering and compositional analysis of saturn's rings using cassini uvis spectral observations |
the icy satellites dione and helene share the same orbit, at 6.26 saturn radii from the giant planet, which is within saturn’s diffuse e ring. helene is one of dione’s two trojan moons, located in the leading lagrangian point l4 of dione’s orbit. we present here preliminary results on the investigation of the dione-hel... | multi-wavelength investigation of the co-orbital moons dione and helene |
gravity field measurements only weakly constrain the deep interiors of jupiter and saturn, stymieing efforts to measure the mass and compactness of these planets' cores, crucial properties for understanding their formation pathways and evolution. however, studies of saturn's rings by cassini have revealed waves driven ... | saturn's diffuse core from ring seismology |
ladon is an ancient multi-ringed impact basin located within a system of channels and basins along the uzboi-holdon-ladon-margaritifer outflow system that extends from argyre to the south to the margaritifer basin [1]. the formation of this extensive system is thought to have occurred in the late noachian to early hesp... | late lava flows and hydrothermal alteration in ladon basin (mars) |
we combine visible and near-ir multispectral data from the kaguya multiband imager (mi) with thermal infrared multispectral data from the lro diviner lunar radiometer experiment to produce global mineral abundance data at 60-m resolution. the base data set applies a radiative transfer mixing model to the kaguya mi data... | global high resolution mineral maps of the moon using data from the kaguya multiband imager and lro diviner lunar radiometer |
the nasa planetary science summer seminar (psss), sponsored by the jet propulsion laboratory (jpl), offers advanced graduate students and recent doctoral graduates the unique opportunity to develop a robotic planetary exploration mission that answers nasa's science mission directorate's announcement of opportunity for ... | a centaur reconnaissance mission: a nasa jpl planetary science summer seminar mission design experience |
determining the current state, structure, and composition of the moon's interior is of prime importance within the field of planetary geophysics. these characteristics have implications that may help to advance theories with regards to the formation and evolution of the earth-moon system. of the available methods to pr... | time-dependent hybrid plasma simulations of lunar electromagnetic induction in the solar wind |
the explosive volcanism on mercury [1,2,3,4] usually manifests with endogenic pits (vents) surrounded by bright deposits with a red spectral slope (faculae) [5,6]. the largest numbers of vents are on the floors, rims, central peaks or peak rings of impact structures, on faults, or within 20 km of a fault [7] and their ... | spectral identification of faculae on mercury by unsupervised classification of mascs/messenger data |
titan hosts the most chemically complex atmosphere in the solar system. the first encounter of the cassini spacecraft with titan was in october 2004 with a closest approach altitude of 1147km. since then the cassini has made measurements of the ionospheric species over multiple flybys and has provided a unique opportun... | variations in titan's ionospheric densities over a 10 year time period of the cassini mission |
the jovian satellite ganymede is the biggest moon of our solar system. one of the main motivation of our interest for this moon is its own intrinsic magnetic field, which has been discovered during the galileo mission (kivelson et al. 1996). the magnetic field of ganymede directly interacts with the corotating jovian p... | hybrid multi-grids simulations of ganymede's magnetosphere : comparison with galileo observations. |
i re-examine the fission hypothesis for the formation of pluto's moons within the framework of a gas ring model for the origin of the solar system (prentice 1978 moon planets 19 341; 2015 lpsc, abs. 2664). it is supposed that the planetary system condensed from a concentric family of orbiting gas rings. these were cast... | formation of pluto's moons: the fission hypothesis revisited |
titan's polar surface is dotted with hundreds of lacustrine depressions. their morphology suggests that their development would be associated to karstic-like processes, involving titan's liquids (methane, ethane) dissolving the solid surface, presumably composed of organics and ices. in the present work, we test whethe... | dissolution on titan and on earth: towards the age of titan's karstic-like landscapes |
mare humorum, centered at 24°s and 39°w is a mare basin of nectarian age present at the southwestern end of oceanus procellarum towards the nearside of the moon. it displays several rings, in varying states of exposure and preservation. the area is entirely flooded by mare material that constitutes its major recognizab... | study of mineralogy of mare humorum, moon utilizing hysi and m3 data from chandrayaan-i mission dr. mamta chauhan and mayank bishwaridept. of geology, school of earth sciences, banasthali vidyapith, rajasthan, india geologymamta@gmail.com |
juno is in orbit about jupiter and will likely continue collecting data for several more years. cassini collected data during close encounters within the saturn ring plane for several months in 2017. the main source of information is the gravity data and magnetic field data, augmented in the case of juno by microwave r... | what juno and cassini have told us about giant planet interiors |
from its south pole, the saturnian moon enceladus ejects plumes of gas and water ice grains, formed from its subsurface ocean, into space. a similar phenomenon is suspected to occur on jupiter"s moon europa. the emitted ice grains can be analyzed by impact ionization mass spectrometers, such as the cosmic dust analyzer... | analogue experiments for the detection of microorganisms on enceladus and europa |
the milo space science institute (http://miloinstitute.org ) is a non-profit seeking to provide affordable access to deep space science missions by bringing together a consortium of global universities and space agencies to conduct the missions. one of milo's missions that is directly relevant to planetary defense is c... | apophis pathfinder: the milo space science institute's smallsat mission to investigate the potentially hazardous asteroid (99942) apophis |
prior to entering saturn's atmosphere, the cassini spacecraft executed a series of 22 highly inclined orbits, the grand finale orbits, through the previously unexplored region between saturn and its extensive ring system. the ion and neutral mass spectrometer (inms) aboard cassini returned the first direct measurements... | compositional measurements of saturn's upper atmosphere and rings from cassini inms |
catalogs of impact craters - not only a layers of objects in gis but complete databases containing the morphometric and geomorphological characteristics - can help to solve such fundamental problems as the estimation of parameters of populations of impactors that collided with the surface of the planet throughout its h... | creation of a new global geomorphological catalog of mercury's craters based on the latest messenger data |
in a rocky body with no tectonic activity, bolide impacts may be the only significant form of crustal recirculation. although the physical properties of shocked rocks at ambient pressures and temperatures are beginning to be known, in-situ properties at depth are still poorly understood. in the case of chicxulub, the s... | laboratory measurements of porosity parameterization and wavespeed dependence under confining pressure up to 200 mpa in shocked chicxulub peak-ring granitoids. |
the inner au of protoplanetary disks hosts many complex physical processes such as star-disk interactions, magnetic fields, dust destruction, planet formation, and migration. to directly study this region requires milli-arcsecond angular resolution, beyond the diffraction limit of the world's largest optical telescopes... | characterizing the inner au of v1295 aql |
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