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inconsistencies between ice giant planet characteristics and classic planet formation theories have led to a re-evaluation of the formation of the outer solar system. thommes model migration delivers proto-uranus and neptune from orbits interior to saturn to their current locations. the thommes model has also been able... | formation of ice giant satellites during thommes model mirgration |
understanding planet formation is crucial to unraveling the history of our solar system. refining our theory of planet formation has become particularly important as the discovery of exoplanet systems through missions like kepler have indicated that our system is incredibly unique. compared to other systems around sun-... | solar system evolution through planetesmial collisions |
in this chapter, we review the current understanding of planet formation processes by focusing on low-mass planets, which represent the best candidates for habitability. we present the different theoretical models that have been developed during the recent years and their predictions in terms of planetary composition, ... | planet formation, migration, and habitability |
in the context of plate motion reconstructions for the nazca, cocos and south american plates in relation with the galápagos hotspot, it is found that the age-depth dependence of bathymetry, dynamic topography due to the galápagos plume, crustal relaxation, and magmatic production allow for us to estimate the subsidenc... | island emergence/subsidence histories and their bearing upon biological speciation in the galápagos |
t-tauri stars are late-type pre-main-sequence stars that are gravitationally contracting towards the main sequence. magnetic fields largely dictate the angular momentum evolution of these stars and can affect the formation and migration of planets. thus, characterizing their magnetic fields is critical for testing and ... | magnetic fields and planets of t tauri stars |
reflection seismic exploration, generally using a cartesian (x,y,z) geometry, has been a successful subsurface imaging method for many decades. however, there are some acquisition geometries and structures that may be better described as radially or spherically symmetric - for example, planetary bodies, domal batholith... | reflection seismology in spherical bodies: theory with lab, batholith, and whole earth cases |
we present results from 2d hydrodynamic simulations of circumbinary discs, and the evolution of embedded planetary cores, with application to the kepler-16, 34 and 35 systems. these cover a range of binary mass and orbital properties, but all share a common planetary architecture, with the planet lying close to the cri... | the impact of self-gravity on planet and disc evolution in the kepler-16, 34 and 35 circumbinary systems |
the article analyzes the existing theoretical models of the formation of the solar system and the early physical conditions on earth from the point of view of the possibility for the development of life in its present form. we show that the origin of the biosphere and geomagnetic field was determined not only by the co... | the young sun, conditions on the early earth, and the origin of life |
we describe a new model of dusty plasmas based on the particle-in-cell (pic) code lsp. dusty plasmas are important for understanding a wide range of applications and phenomena such as plasma machining and planet formation. these plasmas are typically highly coupled with inclusions of nanometer to millimeter particles. ... | a particle-in-cell approach to the charging of dust particle inclusions immersed in plasma |
theoretical studies have long suggested that magnetic fields played a central role in the evolution of the solar nebula, mediating the transport of angular momentum and mass. recent paleomagnetic studies of meteorites have provided the first measurements of such magnetic fields in the terrestrial planet region (1-3 au)... | measurements of early magnetic fields in the innermost and outer solar system from co chondrites |
hirise images show that barchan dunes in the bagnold dune field merge and change abruptly into linear dunes as they migrate southward (fig. 1). models of the conditions required to produce this kind of change have evolved substantially over the past half-century. first-generation models (pre-1980s) generally considered... | interpretation of wind regime of bagnold dunes in gale crater, guided by third-generation models of dune formation |
the solar power sail (sps) mission is one of candidates for the upcoming strategic middle-class space exploration to demonstrate the first outer solar system journey of japan. the mission concept includes in-situ sampling analysis of the surface and subsurface (up to 1 m) materials of a jupiter trojan asteroid using hi... | in-situ sampling analysis of a jupiter trojan asteroid by high resolution mass spectrometry in the solar power sail mission |
some giant planets migrate from their birthplace beyond the ice line to short-period orbits just a fraction of an au from their host stars. though many theories have been proposed, it is not yet clear which mechanism is most important for migration, and by extension, in which types of planetary system we can expect a g... | giant planets in open clusters and binaries: observational constraints on migration |
the atmospheric carbon-to-oxygen ratio is believed to be a key to formation scenario of exoplanets. due to different condensation temperatures for water, carbon oxide, and carbon dioxide, their "icelines" are situated at different parts of the protoplanetary disk resulting in different c/o ratio values through the disk... | c/o atmosphere measurements |
the origin of hot jupiters, giant planets residing within about one tenth of an au from their host stars, remains a long-standing problem in exoplanetary science. traditionally, these objects are thought to form further out, before migrating to their short-period orbits, though the possibility of an in-situ formation p... | a secular resonant origin for the loneliness of hot jupiters |
warm jupiters often refer to giant planets with intermediate orbit periods between 10-200 days. their period range corresponds to the so-called "period valley", the observed dip in occupation in-between the hot jupiters and cold jupiters. observational evidences suggest that they are a distinct population from the hot ... | on the two tales of warm jupiters |
theory and past observations have provided evidence that atmospheric tides and other global scale waves may nonlinearly interact to produce additional secondary waves throughout the space-atmosphere interaction region (sair). however, the manifestation of these secondary waves and the extent of their impacts on sair ar... | impacts of nonlinear tidal-planetary wave interactions on the space-atmosphere interaction region |
we investigate the properties of alternate bars in long straight reaches of channelized streams subject to an unsteady, irregular flow regime. to this aim we propose a novel integration of a statistical approach with the analytical perturbation model of tubino (1991) which predicts the evolution of bar properties (name... | defining the formative discharge for alternate bars in alluvial rivers |
i will offer a condensed overview of some key issues in protoplanetary disk research that makes use interferometric measurements of the millimeter-wavelength continuum emitted by their solid particles. several lines of evidence now qualitatively support theoretical models for the growth and migration of disk solids, bu... | millimeter continuum observations of disk solids |
the past two decades have seen a significant advancement in the detection, classification and understanding of exoplanets and binary star systems. this is due, in large part, to the increase in use of small aperture telescopes (< 20 cm) to survey large portions of the night sky to milli-mag precision with rapid cade... | the precision analysis of time series photometry and its application to searches for pre-main-sequence objects |
the small next-generation atmospheric probe (snap) mission concept was selected under the nasa planetary science deep space small satellite (psds3) call. envisioned as a secondary probe on a future ice giant flagship mission nominally comprising an orbiter and primary probe, snap would provide measurements of spatially... | the small next-generation atmospheric probe (snap) for exploration of the ice giants - a psds3 mission concept study |
though migrations of earth's intertropical convergence zone (itcz) are often interpreted in terms of meridional energy transports, a recent study using an idealized, aquaplanet gcm indicates that the itcz's position is also linked to the character of the boundary layer momentum budget. namely, moist convection within t... | dry rainbelts: understanding boundary layer controls on the itcz using a dry dynamical core |
under unidirectional wind regimes, flat sand beds become unstable to produce periodic linear dunes, commonly called transverse dunes because their main ridges are oriented perpendicular to the air flow. in areas of low sediment availability, the same interactions between flow, transport and topography produce barchan d... | dune growth under multidirectional wind regimes |
one of the great exoplanet surprises of recent years is the discovery of very short period (~1 day or less) rocky planets. theory has so far been unable to conclusively determine whether such planets were formed in situ or had to form further out and reach their present orbits via migration. we examine a possible barri... | is collisional fragmentation a barrier to the formation of short-period planets? |
t tauri stars are a young class of variable stars. the t tauri star ptfo 8-8695, which lies around 1,100 light-years away in orion, has been suspected of harboring a close-in giant planet. a recent study, however, casts doubt on this theory.fading starfinding a close-in giant planet around a very young (i.e., less than... | testing for the presence of a planet |
we present initial findings from our infrared rv survey of young stars in search of young hot jupiters utilizing high dispersion ir (2.3micron) spectra from gemini south phoenix, vlt crires and keck nirspec. our technique uses telluric features as an absolute wavelength reference, allowing us to achieve a precision of ... | an infrared radial velocity search for 'hot jupiters' around young stars |
(ultra)mylonites from plate boundary shear zones are characterized by severe grain-size reduction and well-mixed mineral phases. the evolution from relatively undeformed tectonite protoliths to highly deformed (ultra)mylonites via the formation of new grain and phase boundaries is described as microstructural `damage.'... | experimental constraints and theoretical bases for microstructural damage in plate boundary shear zones |
twenty years after the discovery of 51 peg-b, hundreds of giant exoplanets have now been identified with several of them deeply characterized, from both ground- and space-based observations. radial velocity and photometric surveys have considerably changed our vision of gaseous planets, and the emerging capabilities of... | twenty years of giant exoplanets |
planets in early-type systems seem to frequently misalign from their host star's spin axis. these spin-orbit misaligned systems challenge conventional planet-formation theories because planets probably do not form with initially misaligned orbits -- their angular momenta must be conserved with the stellar nursery in wh... | probing spin-orbit misalignment processes around early-type stars |
theories of the formation and early evolution of planetary systems postulate that planets are born in circumstellar disks, and undergo radial migration during and after dissipation of the dust and gas disk from which they formed. the precise ages of meteorites indicate that planetesimals - the building blocks of planet... | a neptune-sized transiting planet closely orbiting a 5-10-million-year-old star |
measuring the obliquities of exoplanet-host stars provides invaluable diagnostic information for theories of planetary formation and migration. most of these results have so far been obtained by measuring the rossiter-mclaughlin effect, clearly favoring systems that harbor hot jupiters. while it would be extremely help... | spin-orbit alignment of exoplanet systems: analysis of an ensemble of asteroseismic observations |
d'angelo & bodenheimer (2013, apj, 778, 77) performed global 3d radiation-hydrodynamics disk-planet simulations aimed at studying envelope formation around planetary cores, during the phase of sustained planetesimal accretion. the calculations modeled cores of 5, 10, and 15 earth masses orbiting a sun-like star in ... | disk-planet torques from radiation-hydrodynamics calculations with spatially-resolved planetary envelopes undergoing solids' accretion |
the redistribution of melt in partially molten rocks undergoing deformation markedly influences the physical and chemical evolution of earth's mantle. stress-induced alignment of melt pockets and subsequent formation of melt-enriched bands introduce significant anisotropy in microstructure and thus in viscosity. in sam... | influence of compaction length on base-state melt segregation |
grain growth in protoplanetary disks is the critical first step in the formation of planetesimals and ultimately planets. this process is not well constrained, however, because grain sizes are difficult to measure directly. a potential observational breakthrough came from the recent detection of spatially-resolved pola... | probing disk magnetic fields and grain growth through (sub)millimeter polarization |
aeolian environments evolve, and connect with other parts of the earth system, during transport events. much is known about the sand transport process itself, however less is understood about the requisite macroscopic conditions for its onset. these controls, such as atmospheric stability and humidity, are represented ... | the unsung aeolian movers and shakers: atmospheric stability and humidity |
the proposed nasa new frontiers saturn probe interior and atmosphere explorer (sprite) mission would measure the abundance of helium and the other noble gases, elemental and isotopic abundances, the clouds, dynamics, and processes within saturn's troposphere. in situ measurements of saturn's atmosphere by sprite would ... | the saturn probe interior and atmosphere explorer (sprite) mission concept |
about 4000 exoplanets have been detected and their statistical properties such as mass and orbital distributions become clear. however, the origin of these distributions is still uncertain. in this study, applying a recent core accretion model to data of exoplanets, we clarify whether it is possible to explain the obse... | an interpretation of exoplanet masses and orbital radii with a theoretical model of gas giant formation |
recent work by the hunt for exomoons with kepler (hek) collaboration suggests that moons are rare in exoplanetary systems between 0.1 and 1 au. this result appears to be consistent with theoretical studies suggesting that moons will be lost through dynamical processes as giant planets migrate inward. as such, the deart... | on the population of exomoons - in kepler, and the exomoon candidate kepler-1625b i |
the gravitational pull exerted on saturn by each of its moons raises a tidal bulge on the gas giant. because of poorly understood dissipative processes happening in the host planet, the tidal bulge is not directed along the direction of the moon. this allows the transmission of energy from the rotation of the planet to... | detection of rapid orbital expansion of saturn's moon titan |
we propose for 2.5 nights on keck-i/hires to confirm three candidate neptune-size planets and two candidate planets around m dwarfs from the hatnet and hatsouth surveys, and to confirm and characterize the outer planets in three candidate multi-planet hot-jupiter-hosting systems. at present there are very few well-char... | confirming and characterizing transiting neptunes and transiting planets around m dwarfs using keck/hires |
tess' all-sky survey enables studies of the demographics of exoplanets around stars too rare to have been observed in significant numbers by previous missions, or which were simply ignored by earlier observations. one such class is main sequence a stars, which are relatively rare and were mostly avoided by kepler. meas... | the short-period planetary population of a type stars with tess |
first recognized by laplace more than two centuries ago, the lunar gravitational and shape anomalies associated with rotational and tidal bulges are significantly larger than predicted from the hydrostatic theory. the harmonic degree-2 gravitational coefficients of the moon, c20 and c22 (measuring the size of the rotat... | formation of the lunar fossil bulges and its implication for the early earth and moon |
ongoing discoveries of terrestrial exoplanets suggest that these planets might span a wide range of climatic regimes and atmospheric circulations, which will strongly impact their habitability. here, we use an idealized moist general circulation model in aquaplanet configuration to characterize the atmospheric circulat... | climates of high obliquity terrestrial planets |
hot jupiters are giant planets located extremely close to their host stars, with orbital periods less than 5 days. many aspects of hot jupiter (hj) formation remain unclear, but several clues, such as the observed misalignment between their orbital axes and their hosts' spin axes, point to a dynamical origin. in the fi... | spin-orbit coupling and tidal dissipation in hot jupiter systems |
the kepler space telescope discovered over thousands of planet candidates, ~1600 of which are in systems with multiple transiting exoplanets. the properties observed in these systems give decisive insight to the architectures of exoplanetary systems. the distribution of period ratios shows those at near-resonance to be... | differences between kepler's near-resonant and non-resonant populations |
we propose a jwst-miri program to systematically trace the chemical evolution over the lifetime of planet-forming disks, using the complete sample of 30 disks recently observed by the alma survey of gas evolution in protoplanetary disks (age-pro, 103h). this sample is the first systematically selected sample to study g... | building on alma: a jwst legacy survey of the chemical evolution of planet-forming disks |
ward (1981) introduced the concept of scanning secular resonances and showed that the observed orbital architecture of a system can be used to constraints earlier epochs of evolution. this work established a generalised framework for tracing the linear secular evolution of a planetary system through an epoch where the ... | scanning secular resonance theory and the epoch of giant planet migration |
open clusters (ocs) are routinely used as reliable tracers of the properties and evolution of the galactic disk, as they can be found at all galactocentric distances and span a wide range of ages. more than 3000 ocs are listed in catalogues, although few have been studied in details. the goal of this work is to study t... | open clusters as tracers of the galactic disk |
the planets in our solar system all orbit in roughly the same direction as the sun spins but this isnt true for all planetary systems! recent measurements of the spin angle of a nearby, planet-hosting star provide new insight into how solar systems form.the birth of a solar systemif planets form from the same rotating ... | alignment of a star and a planet |
a surprising discovery in exoplanet science is the existence of compact systems of earth to super-earth sized planets orbiting within 0.01-0.1 au from their star, a region lacking planets in our solar system. while compact systems are common, their origin is debated. a prevalent assumption is that compact systems forme... | origin of compact exoplanetary systems during disk infall |
inside-out planet formation (iopf) is a theory addressing the origin of systems of tightly-packed inner planets (stips) via sequential in situ formation and growth of the planets. it predicts that a pebble ring is established at the pressure maximum associated with the dead zone inner boundary (dzib) with an inner disc... | inside-out planet formation: effect of planetesimal-disk interactions and finite formation time on oligarchic coagulation from a pebble ring |
context. the discovery of planets orbiting at less than 1 au from their host star and less massive than saturn in various exoplanetary systems revolutionized our theories of planetary formation. the fundamental question is whether these close-in low-mass planets could have formed in the inner disk interior to 1 au, or ... | planetary system architectures with low-mass inner planets. direct imaging exploration of mature systems beyond 1 au |
sublimation waves are periodic, linear and transverse bedforms that grow by sublimation of icy substrates under turbulent winds. they occur in different environments of the earth and other planets, where the climate is favorable to sublimation. their morphological and kinematic characteristics (wavelength, migration ve... | sublimation and condensation waves on icy planetary surfaces |
the kepler mission discovered 92 systems with 4 or more transiting exoplanets. systems like kepler-11 with six "mini-neptunes" on orbital periods well inside that of venus pose a challenge to planet formation theory which is broadly split into two competing paradigms. one theory invokes the formation of neptunes beyond... | the constraint of coplanarity: compact multi-planet system outer architectures and formation.-up |
observational breakthrough has been achieved in characterizing the properties of protoplanetary disks and extrasolar planets in the last decade. we thus gain a better understanding on both the birth conditions and the end products of planets. meanwhile, more advanced theoretical and numerical models are required to est... | pebble-driven planet formation around stars of different masses |
young planets are known to interact gravitationally with their natal protoplanetary disks, acting as facilitators of angular momentum transport and disk accretion. when a planet's tidal torque becomes comparable to the viscous torque in the disk, it carves a low-density "gap" in the vicinity of its orbit. these gaps ar... | steady-state pileups around planets in accreting disks |
with over 4000 planets discovered outside of the solar system, exoplanet scientists are working both to better understand the exoplanets we have found and to discover exoplanets unlike any we have found. the mass-semimajor axis distribution of exoplanets summarizes our progress in detecting exoplanets and characterizin... | where do we find exoplanets? |
hot jupiters are gas giants orbiting their host stars with an orbital period ≲10 days, warm jupiters have periods ranging between 10 days and 100 days. explaining the origin of hot and warm jupiters sets a great challenge to the current planet formation theories.in situ formation is problematic due to deficiency of mat... | origin of hot & warm jupiters from enhanced high eccentricity migration |
stars form via the gravitational collapse of molecular clouds during which time the protostellar object contracts by over seven orders of magnitude. if all the angular momentum present in the natal cloud was conserved during collapse, stars would approach rotational velocities rapid enough to tear themselves apart with... | revolution evolution: tracing angular momentum during star and planetary system formation |
within atmospheric boundary layers(bl), internal bl (ibl) develop across sharp flow-normal topographic changes in planetary surfaces. at white sands, new mexico, topographic change is brought about by the bl itself in the form of wind-blown sand dunes. there is an abrupt roughness change from a smooth playa to a dune f... | internal boundary layer induced by dune-field roughness |
in the thirty years since the discovery of 51 pegasi b, a hot jupiter orbiting a g star, we have yet to discern the primary mechanism by which giant planets migrate to compact orbital configurations. planets either migrate slowly within the protoplanetary disk or undergo high-eccentricity tidal migration and are placed... | the migration and evolution of eccentric planets (meep) survey |
tess' all-sky survey enables studies of the demographics of exoplanets around stars too rare to have been observed in significant numbers by previous missions, or which were simply ignored by earlier observations. one such class is main sequence a stars, which are relatively rare and were mostly avoided by kepler. meas... | the short-period planetary population of a stars with tess |
were marss two moons once asteroids? did they coalesce from the debris created when a massive object struck mars? or, as explored in a recent article, did they form when a single moon split in two?a close-up view of the larger of marss moons, phobos, taken by the mars global surveyor spacecraft. [nasa/jpl/malin space s... | testing a new way to make mars's moons |
over the years, different terrestrial planets have formed and evolved around the solar system. long before the discovery of exoplanets and circumstellar disks, scientists were considering several theories regarding the origin of the solar system. star creation in molecular clouds is where the current model begins. the ... | formation and evolution of exoplanets |
hot jupiters (hjs) are giant planets with orbital periods of the order of a few days with semimajor axis within ~0.1 au. several theories have been invoked in order to explain the origin of this type of planets, one of them being the high-eccentricity migration. this migration can occur through different high-eccentric... | production of hot jupiter candidates from high-eccentricity mechanisms for different initial planetary mass configurations |
migrating tides dominate the tropical climate on mars and are known to reach high amplitudes during global dust events (gde). in this study, we characterize the amplitude, phase and vertical wavelength of the diurnal and semidiurnal migrating tides in mars' lower atmosphere (up to 50 km) by exploiting temperature verti... | thermal tides on mars before and during the 2018 global dust event as observed by tirvim-acs onboard exomars trace gas orbiter |
ring-like substructures observed in protoplanetary disks are often interpreted as dust concentrations located at radial pressure bumps. it has been hypothesized that these pressure bumps act as efficient factories for forming protoplanets. one supporting argument is that they can trap low-mass planets by facilitating a... | the fate of accreting luminous planets born at pressure bumps |
multiplanet systems orbiting m dwarfs are valuable testing grounds for theories of small-planet formation and evolution. k2-3 is an early m dwarf hosting three small exoplanets (1.5-2.0 earth radii) at distances of 0.07-0.20 au. we measure the high-energy spectrum of k2-3 with hst/cos and xmm-newton and use empirically... | the k2-3 system revisited: testing photoevaporation and core-powered mass loss with three small planets spanning the radius valley |
the vast majority of main sequence stars host exoplanets, and the vast majority of stars conclude their evolution as roughly earth-sized white dwarf stars; therefore, we expect the majority of white dwarfs to host exoplanets. searching for exoplanet transits of white dwarfs requires different approaches than other area... | candidate planets transiting white dwarf stars in zwicky transient facility data |
almost three decades have passed since the first discovery of a hot jupiter and many have been discovered since then. however, their formation and migration mechanisms are not yet understood and we lack methods that can clearly determine whether a hot jupiter has moved through either disk-free or disk-driven migration ... | testing the c/o ratio prediction for hot jupiters from disk-free migration |
while the kepler mission discovered thousands of planets around main sequence stars, red giant stars were largely unexplored. a sample of transiting planets around these more evolved stars can test theories of giant planet inflation and migration, problems that have gone unsolved for more than 20 years. for my thesis, ... | planetary archaeology: a search for transiting planets orbiting evolved stars with k2 |
the apache point observatory galactic evolution experiment (apogee) is a near-infrared (1.5-1.7 microns), high resolution (r~22,500), high s/n (>100), spectroscopic survey as part of the sloan digital sky survey (sdss). among the goals of this survey is multi-epoch monitoring of exoplanetary systems discovered by th... | probing planet formation with apogee: a dichotomy in planet orbital-periods and stellar metallicities |
the formation and evolution of short-period gas-giant exoplanets have been a persistent enigma for planetary science. most theoretical frameworks describing short-period gas-giant formation can be broadly divided into two classes - disk migration and high-eccentricity migration - and each of these model paradigms impri... | toi-618: a benchmark multi-planet system discovered using tess photometry and long-term rv monitoring |
a leading theoretical expectation for the final stages of planet formation is that disk migration should naturally drive orbits into chains of mean motion resonances (mmrs). in order to explain the dearth of mmr chains observed at gyr ages (<1%), this picture requires such configurations to destabilize and scramble ... | stability constrained characterization of the 23 myr-old v1298 tau system: do young planets form in mean motion resonance chains? |
the first moments of our solar system are determined by the gas phase of the protoplanetary disk, where the first solid bodies, the planetesimals, were formed. while planetesimals accreted to form planets, a lot of them were also removed during the violent phases of dynamical interaction with the growing planets, plane... | ancient asteroids: an observing campaign reveals the spin states of asteroids that belong to the most ancient collisional families of our solar system |
exoplanet observations have revealed numerous examples of systems hosting planets residing in mean motion resonances. these dynamical configurations are usually assumed to be the product of past orbital migration due to interactions with a proto-planetary disk. planets that experience smooth migration and eccentricity-... | inferring migration histories of resonant planets |
exploration of possible anomalies in the decay of different radionuclides is an active research area in the fields of astrophysics and nuclear physics. the most significant changes in decay rates can be expected for β- , β+ or electron capture decay nuclides, due to the proposed influence of the solar neutrino flux by ... | search for variations of 22na decay constant |
the stability of the nuclear decay rate parameters have been investigated for many years. for example, the 7be electron capture decay rate is affected by the electron density or low-temperature. unexplained variations of the decay rate parameter measurement for weak interaction decays, as well as strong interaction dec... | review of the decay rate parameter variation due to neutrino/antineutrino interactions |
in 2009, jenkins et. al. reported a cyclic variation with a period of one year in the decay rates of 32si (t1/2= 153 y) and 226ra (t1/2=1600 y), based on reviews of previously published decay data for those nuclei. it was suggested that this variation was related to the annual variation of the solar-neutrino flux due t... | non-dependence of the decay rates of 123i and 99mtc on earth-sun distance |
we continue examining statistical data assimilation, an inference methodology, to infer solutions to neutrino flavor evolution, for the first time using real—rather than simulated—data. the model represents neutrinos streaming from the sun's center and undergoing a mikheyev-smirnov-wolfenstein resonance in flavor space... | inference finds consistency between a neutrino flavor evolution model and earth-based solar neutrino measurements |
ce, nd, sm and gd isotopic compositions of eight eucrites were determined for better understanding of differentiation on the parent body by la-ce and sm-nd chronometers and of cosmic-ray exposure records by neutron-captured sm and gd isotopic shifts. | systematic ree isotopic studies of eucrites |
volatiles from high-temperature (above 500°c) pyrolysis of drilled and sieved deltaic/lacustrine mudstones at yellowknife bay and pahrump hills were detected by the sample analysis at mars (sam) instrument's evolved gas analysis experiment onboard the curiosity rover in gale crater, mars. mass fragments detected from t... | evidence of refractory organic matter preserved in the mudstones of yellowknife bay and the murray formations |
callio lab, the host of callio spacelab, is a unique underground infrastructure located at the depths of the pyhäsalmi mine, finland. it is one of the cornerstones of the "callio - mine for business" concept. the callio concept aims to create and maintain an economically feasible environment for all mine re-purposing a... | the deep underground callio spacelab, finland - sustainable living, sustaining life |
the nucleon-2 experiment is aimed at the investigation of isotope and charge composition of medium, heavy and ultra-heavy ions (z < 82) in the 300 mev/n - 1 gev/n energy range. the concept design of detctor for the nucleon-2 satellite cosmic ray experiment is presented. the beam-test results for the prototype of the... | current status of the nucleon-2 mission |
the cosmic ray isotope spectrometer (cris) on the ace spacecraft has been measuring the isotopic composition of galactic cosmic rays (gcrs) since august 1997. using selected data from the past seventeen years, we have a set of 2.95 x 105 56 fe nuclei in the energy interval 240 to 470 mev/nucleon with excellent mass res... | observation of 60fe in the galactic cosmic rays |
we revisited exposure ages of apollo zircons through the cosmic ray effects on lithium isotope compositions to improve our understanding of lunar regolith. | lithium stable isotope records of irradiation in apollo lunar zircon |
with the opening of apollo 17 double drive tube 73001/73002 as part of the apollo next generation sample analysis (angsa) program, we present information about the lithologic makeup of rock components of station 3 regolith. we report compositions and petrologic classification of 2-4 mm rock fragments (73243) of station... | apollo next generation sample analysis: what to expect among rock fragments in apollo 17 core samples 73001 and 73002 |
co chondrites from the dominion range represent a wide range of ages and petrologic types. | cosmic ray exposure ages, bulk and isotopic h, c, and n compositions of dominion range (dom) co3 carbonaceous chondrites and implications for pairing |
the cosmic ray isotope spectrometer (cris) and solar isotope spectrometer (sis) on the advanced composition explorer (ace) have been measuring the energy spectra of galactic cosmic-ray elements and isotopes from since it was launched in august 1997. we have measured the energy spectra of abundant elements from c to ni ... | comparison of galactic cosmic-ray element intensities during the 1997, 2009, and 2019-2020 solar minima |
we investigated the noble gas isotopic composition of the mg pallasite sericho by in situ and whole rock analyses and estimated a cosmic-ray exposure age. | noble gases from in situ and whole rock analyses of main-group pallasite sericho |
nuclear interactions of protons and helium ions accelerated in solar flares with solar atmosphere are simulated using geant4 toolkit.the long term average spectrum of solar cosmic rays is taken from measurements of cosmogenic isotopes production in lunar soil. solar atmospheric profiles of 6li, 7li and 14c generation a... | the angular and energy distributions of neutrons, gamma- and x-rays produced in solar flares. related changes in the isotopic composition of the photosphere and the solar wind |
atmospheric composition measurement from the mars science laboratory are made by both the quadrupole mass spectrometer and the tunable laser spectrometer of the sam instrument suite, while the maven neutral gas and ion mass spectrometer measures the chemical and isotopic composition of constituents of the upper atmosph... | atmospheric evolution and persistence of martian habitability from isotope ratios measured by msl and maven |
in this presentation, we report cosmic ray enhancements in lunar radiation environment observed by the cosmic ray telescope for the effects of radiation (crater) onboard the lunar reconnaissance orbiter (lro). the crater instrument onboard the lro characterizes the global lunar radiation environment and its biological ... | cosmic ray enhancements observed by the crater onboard the lro |
a long-held dream of glaciologists has been the direct radiometric dating of ancient glacial ice. carbon-14 is unfortunately complicated by in-situ cosmogenic production of this isotope from cosmic ray spallation on oxygen nuclei in the ice. krypton-81 is an ideal tracer in several ways: it has no anthropogenic sources... | first krypton-81 dating of glacial ice at taylor glacier, antarctica |
type ia supernovae are important across many astrophysical domains, serving as standardizable candles for cosmology, sources of cosmic rays, turbulence, and enriched isotopes for the interstellar medium, and endpoints of binary evolution. yet, the nature of their stellar progenitors remains elusive. for decades, the le... | the fate of exploding carbon-oxygen chandrasekhar-mass white dwarfs: the production of stable iron-peak elements in the type ia supernova remnant 3c 397 |
the nucleon-2 experiment is aimed at the investigation of isotope and charge composition of medium, heavy and ultra-heavy ions (z < 82) in the 300 mev/n - 1 gev/n energy range. the concept design of hicrs for the nucleon-2 satellite cosmic ray experiment is presented. the performed simulation confirms the isotope re... | the nucleon-2 mission current status |
we present here a study of the impact of one sudden stratospheric warming (ssw) upon the atmospheric vertical dynamics based on 7be measurements in near ground air, using both numerical and conceptual. in late september 2002, an unprecedented ssw event occurred in the southern hemisphere (sh), causing changes in the tr... | signature of a sudden stratospheric warming in the near-ground 7be flux. |
the high-energy telescope (het) for the epi-hi experiment on the parker solar probe (psp) is designed to measure the composition of solar-energetic-particle (sep), interplanetary, and galactic cosmic ray (cgr) ions with 1 ≤ z ≤ 30 from 10-20 mev/nuc up to several hundred mev/nuc, as well as electrons from 0.5 to 8 mev.... | solar gamma ray and neutron science with the epi-hi/het telescope on psp |
the high-energy telescope (het) for the epi-hi experiment on the parker solar probe (psp) is designed to measure the composition of solar-energetic-particle (sep), interplanetary, and galactic cosmic ray (cgr) ions with 1 ? z ? 30 from 10-20 mev/nuc up to several hundred mev/nuc, as well as electrons from 0.5 to 8 mev.... | phase-space echos and kinetic density turbulence in the solar wind |
titan, saturn's largest satellite, maintains a thick atmosphere that is composed primarily of molecular nitrogen (n2) at about 98% and methane (ch4) at about 1.5%. these molecules form the basis for a complex atmospheric chemical network. a diverse population of organic compounds is generated through high-altitude phot... | measuring isotopic ratios in titan's atmospheric nitriles |
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