abstract stringlengths 3 192k | title stringlengths 4 857 |
|---|---|
the determination of exoplanet properties and occurrence rates using kepler data critically depends on our knowledge of the fundamental properties (such as temperature, radius, and mass) of the observed stars. we present revised stellar properties for 197,096 kepler targets observed between quarters 1-17 (q1-17), which... | revised stellar properties of kepler targets for the q1-17 (dr25) transit detection run |
we present observations with the cosmic origins spectrograph (cos) onboard the hubble space telescope of five star-forming galaxies at redshifts z in the range 0.2993-0.4317 and with high emission-line flux ratios o32 = [o iii] λ5007/[o ii] λ3727 ∼ 8-27 aiming to detect the lyman continuum (lyc) emission. we detect lyc... | low-redshift lyman continuum leaking galaxies with high [o iii]/[o ii] ratios |
we present the second data release (dr2) of the skymapper southern survey, a hemispheric survey carried out with the skymapper telescope at siding spring observatory in australia, using six optical filters: u, v, g, r, i, z. dr2 is the first release to go beyond the ∼18 mag (10σ) limit of the shallow survey released in... | skymapper southern survey: second data release (dr2) |
transmission spectra are differential measurements that utilize stellar illumination to probe transiting exoplanet atmospheres. any spectral difference between the illuminating light source and the disk-integrated stellar spectrum due to starspots and faculae will be imprinted in the observed transmission spectrum. how... | the transit light source effect: false spectral features and incorrect densities for m-dwarf transiting planets |
double neutron stars (dnss) have been observed as galactic radio pulsars, and the recent discovery of gravitational waves from the dns merger gw170817 adds to the known dns population. we perform rapid population synthesis of massive binary stars and discuss model predictions, including dns formation rates, mass distri... | on the formation history of galactic double neutron stars |
a new star has exploded back onto the climate scene: hydrogen. it offers possibilities to move away from fossil fuels, but it brings its own challenges. | the hydrogen solution? |
we present uv-extended e-miles stellar population synthesis models covering the spectral range λλ 1680-50 000 å at moderately high resolution. we employ the ngsl space-based stellar library to compute spectra of single-age, single-metallicity stellar populations in the wavelength range from 1680 to 3540 å. these models... | uv-extended e-miles stellar population models: young components in massive early-type galaxies |
we present the sphinx suite of cosmological adaptive mesh refinement simulations, the first radiation-hydrodynamical simulations to simultaneously capture large-scale reionization and the escape of ionizing radiation from thousands of resolved galaxies. our 5 and 10 co-moving mpc volumes resolve haloes down to the atom... | the sphinx cosmological simulations of the first billion years: the impact of binary stars on reionization |
we introduce the automatic learning for the rapid classification of events (alerce) broker, an astronomical alert broker designed to provide a rapid and self-consistent classification of large etendue telescope alert streams, such as that provided by the zwicky transient facility (ztf) and, in the future, the vera c. r... | the automatic learning for the rapid classification of events (alerce) alert broker |
as the only dark matter candidate that does not invoke a new particle that survives to the present day, primordial black holes (pbhs) have drawn increasing attention recently. up to now, various observations have strongly constrained most of the mass range for pbhs, leaving only small windows where pbhs could make up a... | revisiting constraints on asteroid-mass primordial black holes as dark matter candidates |
we analyze the near infrared ($\sim0.8-1\mu$m) rest-frame morphologies of galaxies with $\log m_*/m_\odot>9$ in the redshift range $0<z<6$, compare with previous hst-based results and release the first jwst-based morphological catalog of $\sim20,000$ galaxies in the ceers survey. galaxies are classified into f... | galaxy morphology from $z\\sim6$ through the eyes of jwst |
early jwst observations that targeted so-called double-break sources (attributed to lyman and balmer breaks at $z>7$), reported a previously unknown population of very massive, evolved high-redshift galaxies. this surprising discovery led to a flurry of attempts to explain these objects' unexpected existence includi... | $\\lambda$cdm not dead yet: massive high-z balmer break galaxies are less common than previously reported |
we present a new-generation tool to model and interpret spectral energy distributions (seds) of galaxies, which incorporates in a consistent way the production of radiation and its transfer through the interstellar and intergalactic media. this flexible tool, named beagle (for bayesian analysis of galaxy seds), allows ... | modelling and interpreting spectral energy distributions of galaxies with beagle |
in this work we implement the minimal geometric deformation decoupling method to obtain general static interior solutions for a btz vacuum from the most general isotropic solution in 2+1 dimensions including the cosmological constant λ. we obtain that the general solution can be generated only by the energy density of ... | a general interior anisotropic solution for a btz vacuum in the context of the minimal geometric deformation decoupling approach |
the interaction of λ and σ hyperons (y) with nucleons (n) is strongly influenced by the coupled-channel dynamics. due to the small mass difference of the nλ and nς systems, the sizable coupling strength of the nς ↔ nλ processes constitutes a crucial element in the determination of the nλ interaction. in this letter we ... | exploring the nλ-nς coupled system with high precision correlation techniques at the lhc |
i review holographic models for (dense and cold) nuclear matter, neutron stars, and their mergers. i start by a brief general discussion on current knowledge of cold qcd matter and neutron stars, and go on discussing various approaches to model cold nuclear and quark matter by using gauge/gravity duality, pointing out ... | holographic modeling of nuclear matter and neutron stars |
the phangs collaboration has been building a reference data set for the multiscale, multiphase study of star formation and the interstellar medium (ism) in nearby galaxies. with the successful launch and commissioning of jwst, we can now obtain high-resolution infrared imaging to probe the youngest stellar populations ... | the phangs-jwst treasury survey: star formation, feedback, and dust physics at high angular resolution in nearby galaxies |
observing a supernova explosion shortly after it occurs can reveal important information about the physics of stellar explosions and the nature of the progenitor stars of supernovae (sne). when a star with a well-defined edge explodes in vacuum, the first photons to escape from its surface appear as a brief shock-break... | resolving the explosion of supernova 2023ixf in messier 101 within its complex circumstellar environment |
emergent bulk properties of matter governed by the strong nuclear force give rise to physical phenomena across vastly different scales, ranging from the shape of atomic nuclei to the masses and radii of neutron stars. they can be accessed on earth by measuring the spatial extent of the outer skin made of neutrons that ... | determination of the neutron skin of 208pb from ultrarelativistic nuclear collisions |
turbulent rayleigh-bénard convection displays a large-scale order in the form of rolls and cells on lengths larger than the layer height once the fluctuations of temperature and velocity are removed. these turbulent superstructures are reminiscent of the patterns close to the onset of convection. here we report numeric... | turbulent superstructures in rayleigh-bénard convection |
this year marks the 30th anniversary of the only supernova from which we have detected neutrinos—sn 1987a. the 20 or so neutrinos that were detected were mined to great depth in order to determine the events that occurred in the explosion and to place limits upon all manner of neutrino properties. since 1987 the scale ... | what can be learned from a future supernova neutrino detection? |
we estimate the 21 cm radio background from accretion onto the first intermediate-mass black holes between z ≈ 30 and z ≈ 16. combining potentially optimistic, but plausible, scenarios for black hole formation and growth with empirical correlations between luminosity and radio emission observed in low-redshift active g... | modeling the radio background from the first black holes at cosmic dawn: implications for the 21 cm absorption amplitude |
we present the redshift evolution of the galaxy effective radius re obtained from the hubble space telescope (hst) samples of ∼190,000 galaxies at z = 0-10. our hst samples consist of 176,152 photo-z galaxies at z = 0-6 from the 3d-hst+candels catalog and 10,454 lyman break galaxies (lbgs) at z = 4-10 identified in the... | morphologies of ∼190,000 galaxies at z = 0-10 revealed with hst legacy data. i. size evolution |
galaxies and their dark-matter haloes have posed several challenges to the dark energy plus cold dark matter (λcdm) cosmological model. these discrepancies between observations and theory intensify for the lowest-mass (`dwarf') galaxies. λcdm predictions for the number, spatial distribution and internal structure of lo... | baryonic solutions and challenges for cosmological models of dwarf galaxies |
we study a suite of extremely high-resolution cosmological feedback in realistic environments simulations of dwarf galaxies (m_halo ≲ 10^{10} m_{\odot }), run to z = 0 with 30 m_{\odot } resolution, sufficient (for the first time) to resolve the internal structure of individual supernovae remnants within the cooling ra... | be it therefore resolved: cosmological simulations of dwarf galaxies with 30 solar mass resolution |
we compute a new generation of standard solar models (ssms) that includes recent updates on some important nuclear reaction rates and a more consistent treatment of the equation of state. models also include a novel and flexible treatment of opacity uncertainties based on opacity kernels, required in light of recent th... | a new generation of standard solar models |
we present a first sample of 117 [o iii] λλ4960, 5008-selected star-forming galaxies at 5.33 < z < 6.93 detected in jwst/nircam 3.5 μm slitless spectroscopy of a $6\buildrel{\,\prime}\over{.} 5\,\times \,3\buildrel{\,\prime}\over{.} 4$ field centered on the hyperluminous quasar sdss j0100+2802, obtained as part o... | eiger. i. a large sample of [o iii]-emitting galaxies at 5.3 < z < 6.9 and direct evidence for local reionization by galaxies |
we describe the creation, content, and validation of the dark energy survey (des) internal year-one cosmology data set, y1a1 gold, in support of upcoming cosmological analyses. the y1a1 gold data set is assembled from multiple epochs of des imaging and consists of calibrated photometric zero-points, object catalogs, an... | dark energy survey year 1 results: the photometric data set for cosmology |
context. the heating of the solar corona by small heating events requires an increasing number of such events at progressively smaller scales, with the bulk of the heating occurring at scales that are currently unresolved.aims: the goal of this work is to study the smallest brightening events observed in the extreme-uv... | extreme-uv quiet sun brightenings observed by the solar orbiter/eui |
we show that the deep underground neutrino experiment (dune), with significant but feasible new efforts, has the potential to deliver world-leading results in solar neutrinos. with a 100 kton -yr exposure, dune could detect ≳105 signal events above 5 mev electron energy. separate precision measurements of neutrino-mixi... | dune as the next-generation solar neutrino experiment |
studying the formation and evolution of black hole binaries (bhbs) is essential for the interpretation of current and forthcoming gravitational wave (gw) detections. we investigate the statistics of bhbs that form from isolated binaries, by means of a new version of the sevn population-synthesis code. sevn integrates s... | merging black hole binaries with the sevn code |
i show that a recently discovered star cluster near the center of the ultra-faint dwarf galaxy eridanus ii provides strong constraints on massive compact halo objects (machos) of ≳5 m ⊙ as the main component of dark matter. macho dark matter will dynamically heat the cluster, driving it to larger sizes and higher veloc... | constraints on macho dark matter from compact stellar systems in ultra-faint dwarf galaxies |
high-redshift quasi-stellar object (qso) spectra show large spatial fluctuations in the ly α opacity of the intergalactic medium on surprisingly large scales at z ≳ 5.5. we present a radiative transfer simulation of cosmic reionization driven by galaxies that reproduces this large scatter and the rapid evolution of the... | large ly α opacity fluctuations and low cmb τ in models of late reionization with large islands of neutral hydrogen extending to z < 5.5 |
the study of the development of structures on multiple scales in the cold interstellar medium has experienced rapid expansion in the past decade, on both the observational and the theoretical front. spectral line studies at (sub-)millimeter wavelengths over a wide range of physical scales have provided unique probes of... | from bubbles and filaments to cores and disks: gas gathering and growth of structure leading to the formation of stellar systems |
in this first of a series of papers, we utilize results for around 2000 star cluster models simulated using the mocca code for star cluster evolution (survey database i) to determine the astrophysical properties and local merger rate densities for coalescing binary black holes (bbhs) originating from globular clusters ... | mocca-survey database - i. coalescing binary black holes originating from globular clusters |
the predicted rate of binary black hole mergers from galactic fields can vary over several orders of magnitude and is extremely sensitive to the assumptions of stellar evolution. but in dense stellar environments such as globular clusters, binary black holes form by well-understood gravitational interactions. in this l... | binary black hole mergers from globular clusters: implications for advanced ligo |
the kepler mission was designed to identify and characterize transiting planets in the kepler field of view and to determine their occurrence rates. emphasis was placed on identification of earth-size planets orbiting in the habitable zone of their host stars. science data were acquired for a period of four years. long... | kepler data validation i—architecture, diagnostic tests, and data products for vetting transiting planet candidates |
there has been a striking realization that physics resolving the black hole information paradox could imply postmerger gravitational wave echoes. we here report on evidence for echoes from the ligo compact binary merger events, gw151226, gw170104, gw170608, gw170814, as well as the neutron star merger gw170817. there i... | gravitational wave echoes through new windows |
the possibility that primordial black holes (pbhs) represent all of the dark matter (dm) in the universe and explain the coalescences of binary black holes detected by ligo/virgo has attracted a lot of attention. pbhs are generated by the enhancement of scalar perturbations which inevitably produce the induced gravitat... | probing primordial-black-hole dark matter with scalar induced gravitational waves |
over a decade ago, a group of supernova explosions with peak luminosities far exceeding (often by >100 times) those of normal events has been identified. these superluminous supernovae (slsne) have been a focus of intensive study. i review the accumulated observations and discuss the implications for the physics of ... | the most luminous supernovae |
the nature of dark matter (dm) remains unknown despite very precise knowledge of its abundance in the universe. an alternative to new elementary particles postulates dm as made of macroscopic compact halo objects (macho) such as black holes formed in the very early universe. stellar-mass primordial black holes (pbhs) a... | limits on stellar-mass compact objects as dark matter from gravitational lensing of type ia supernovae |
accounting for nebular emission when modeling galaxy spectral energy distributions (seds) is important, as both line and continuum emissions can contribute significantly to the total observed flux. in this work, we present a new nebular emission model integrated within the flexible stellar population synthesis code tha... | nebular continuum and line emission in stellar population synthesis models |
context. the chemical composition of the sun is required in the context of various studies in astrophysics, among them in the calculation of standard solar models (ssms) used to describe the evolution of the sun from the pre-main-sequence to its present age.aims: in this work, we provide a critical re-analysis of the s... | observational constraints on the origin of the elements. iv. standard composition of the sun |
we study the compatibility of recursive techniques with the classical limit of scattering amplitudes through the construction of the classical compton amplitude for general spinning compact objects. this is done using bcfw recursion on three-point amplitudes expressed in terms of the classical spin vector and tensor, a... | recursion in the classical limit and the neutron-star compton amplitude |
we perform three-dimensional general-relativistic magnetohydrodynamic simulations with weak interactions of binary neutron-star (bns) mergers resulting in a long-lived remnant neutron star, with properties typical of galactic bns and consistent with those inferred for the first observed bns merger gw170817. we demonstr... | jets from neutron-star merger remnants and massive blue kilonovae |
we present the highest fidelity spectrum to date of a planetary-mass object. vhs 1256 b is a <20 m jup widely separated (~8″, a = 150 au), young, planetary-mass companion that shares photometric colors and spectroscopic features with the directly imaged exoplanets hr 8799c, d, and e. as an l-to-t transition object, ... | the jwst early-release science program for direct observations of exoplanetary systems ii: a 1 to 20 μm spectrum of the planetary-mass companion vhs 1256-1257 b |
we make use of deep 1.2 mm continuum observations (12.7 μjy beam-1 rms) of a 1 arcmin2 region in the hubble ultra deep field to probe dust-enshrouded star formation from 330 lyman-break galaxies spanning the redshift range z = 2-10 (to ∼2-3 m ⊙ yr-1 at 1σ over the entire range). given the depth and area of aspecs, we w... | alma spectroscopic survey in the hubble ultra deep field: the infrared excess of uv-selected z = 2-10 galaxies as a function of uv-continuum slope and stellar mass |
we compute the expected x-ray diffuse background and radiative feedback on the intergalactic medium (igm) from x-ray binaries prior to and during the epoch of reionization. the cosmic evolution of compact binaries is followed using a population synthesis technique that treats separately neutron stars and black hole bin... | radiation backgrounds at cosmic dawn: x-rays from compact binaries |
a stochastic background of gravitational waves could be created by the superposition of a large number of independent sources. the physical processes occurring at the earliest moments of the universe certainly created a stochastic background that exists, at some level, today. this is analogous to the cosmic microwave b... | stochastic gravitational wave backgrounds |
knowledge of the ages of the stars formed over a galaxy's lifetime is fundamental to an understanding of its formation and evolution. however, stellar ages are difficult to obtain since they cannot be measured from observations, but require comparison with stellar models1. alternatively, age distributions can be derive... | uncovering the birth of the milky way through accurate stellar ages with gaia |
fast radio bursts (frbs) are extragalactic astrophysical transients1 whose brightness requires emitters that are highly energetic yet compact enough to produce the short, millisecond-duration bursts. frbs have thus far been detected at frequencies from 8 gigahertz (ref. 2) down to 300 megahertz (ref. 3), but lower-freq... | chromatic periodic activity down to 120 megahertz in a fast radio burst |
gravitational-wave detectors are starting to reveal the redshift evolution of the binary black hole (bbh) merger rate, r bbh(z). we make predictions for r bbh(z) as a function of black hole mass for systems originating from isolated binaries. to this end, we investigate correlations between the delay time and black hol... | the redshift evolution of the binary black hole merger rate: a weighty matter |
determinations of the ultraviolet (uv) luminosity function of active galactic nuclei (agn) at high redshifts are important for constraining the agn contribution to reionization and understanding the growth of supermassive black holes. recent inferences of the luminosity function suffer from inconsistencies arising from... | evolution of the agn uv luminosity function from redshift 7.5 |
in this work we construct an ultracompact star configuration in the framework of gravitational decoupling by the minimal geometric deformation approach. we use the complexity factor as a complementary condition to close the system of differential equations. it is shown that for a polynomial complexity the resulting sol... | ultracompact stars with polynomial complexity by gravitational decoupling |
we define various types of "phantom" stars that may appear in the tess input catalog (tic), and provide examples and lists of currently known cases. we present a methodology that can be used to check for phantoms around any object of interest in the tic, and we present an approach for correcting the tic-reported flux c... | tess input catalog versions 8.1 and 8.2: phantoms in the 8.0 catalog and how to handle them |
we describe a public data release of the fire-2 cosmological zoom-in simulations of galaxy formation (available at http://flathub.flatironinstitute.org/fire) from the feedback in realistic environments (fire) project. fire-2 simulations achieve parsec-scale resolution to explicitly model the multiphase interstellar med... | public data release of the fire-2 cosmological zoom-in simulations of galaxy formation |
gravitational waves from ~90 black hole binary systems have been detected and their progenitors' properties inferred1 so far by the laser interferometer gravitational-wave observatory2 and virgo3 experiments. this has allowed the scientific community to draw conclusions on the formation channels of black holes in binar... | gw190521 as a dynamical capture of two nonspinning black holes |
axions are some of the best motivated particles beyond the standard model. we show how the attractive self-interactions of dark matter (dm) axions over a broad range of masses, from 10-22 ev to 107 gev , can lead to nongravitational growth of density fluctuations and the formation of bound objects. this structure forma... | large-misalignment mechanism for the formation of compact axion structures: signatures from the qcd axion to fuzzy dark matter |
in the past decade, observations from space and the ground have found water to be the most abundant molecular species, after hydrogen, in the atmospheres of hot, gaseous extrasolar planets1-5. being the main molecular carrier of oxygen, water is a tracer of the origin and the evolution mechanisms of planets. for temper... | water vapour in the atmosphere of the habitable-zone eight-earth-mass planet k2-18 b |
networks have advanced the study of nonlocality beyond bell's theorem. here, we introduce the concept of full network nonlocality, which describes correlations that necessitate all links in a network to distribute nonlocal resources. showcasing that this notion is stronger than standard network nonlocality, we prove th... | full network nonlocality |
we present a survey of the [c ii] 158 μm line and underlying far-infrared (fir) dust continuum emission in a sample of 27 z≳ 6 quasars using the atacama large millimeter array (alma) at ∼ 1\prime\prime resolution. the [c ii] line was significantly detected (at > 5-σ) in 23 sources (85%). we find typical line luminos... | an alma [c ii] survey of 27 quasars at z > 5.94 |
a new final endpoint of complete gravitational collapse is proposed. by extending the concept of bose–einstein condensation to gravitational systems, a static, spherically symmetric solution to einstein's equations is obtained, characterized by an interior de sitter region of p=‑ρ gravitational vacuum condensate and an... | gravitational condensate stars: an alternative to black holes |
we follow our first paper with an analysis of the ensemble of the extensive pre-explosion ground- and space-based infrared observations of the red supergiant (rsg) progenitor candidate for the nearby core-collapse supernova sn 2023ixf in messier 101, together with optical data prior to explosion obtained with the hubbl... | the sn 2023ixf progenitor in m101: ii. properties |
the formation of galaxies by gradual hierarchical co-assembly of baryons and cold dark matter halos is a fundamental paradigm underpinning modern astrophysics. a key test of this paradigm is via the observations of massive galaxies at early times as the evolution of the masses and abundances of dark matter halos is str... | an extraordinarily massive galaxy that formed its stars at $z \\gtrsim 11$ |
we have established precise planet radii, semimajor axes, incident stellar fluxes, and stellar masses for 909 planets in 355 multi-planet systems discovered by kepler. in this sample, we find that planets within a single multi-planet system have correlated sizes: each planet is more likely to be the size of its neighbo... | the california-kepler survey. v. peas in a pod: planets in a kepler multi-planet system are similar in size and regularly spaced |
we introduce a new model for the structure and evolution of the gas in galactic discs. in the model the gas is in vertical pressure and energy balance. star formation feedback injects energy and momentum, and non-axisymmetric torques prevent the gas from becoming more than marginally gravitationally unstable. from thes... | a unified model for galactic discs: star formation, turbulence driving, and mass transport |
the new era of gravitational wave astronomy truly began on september 14, 2015, with the detection of gw150914, the sensational first direct observation of gravitational waves from the inspiral and merger of two black holes by the two advanced ligo detectors. in the subsequent first three observing runs of the ligo-virg... | parameter estimation with gravitational waves |
previous studies based on the analysis of gaia dr2 data have revealed that accreted stars, possibly originating from a single progenitor satellite, are a significant component of the halo of our galaxy, potentially constituting most of the halo stars at [fe/h] < -1 within a few kpc from the sun and beyond. in this p... | the milky way has no in-situ halo other than the heated thick disc. composition of the stellar halo and age-dating the last significant merger with gaia dr2 and apogee |
globular clusters are large and dense agglomerate of stars. at variance with smaller clusters of stars, they exhibit signs of some chemical evolution. at least for this reason, they are intermediate between open clusters and massive objects such as nuclear clusters or compact galaxies. while some facts are well establi... | what is a globular cluster? an observational perspective |
in the context of the massive secondary object recently observed in the compact-star merger gw190814, we investigate the possibility of producing massive neutron stars from a few different equation of state models that contain exotic degrees of freedom, such as hyperons and quarks. our work shows that state-of-the-art ... | gw190814 as a massive rapidly rotating neutron star with exotic degrees of freedom |
we investigate the internal structure and density profiles of haloes of mass 1010-1014 m⊙ in the evolution and assembly of galaxies and their environment (eagle) simulations. these follow the formation of galaxies in a λ cold dark matter universe and include a treatment of the baryon physics thought to be relevant. the... | baryon effects on the internal structure of λcdm haloes in the eagle simulations |
we present a critical assessment of the sn1987a supernova cooling bound on axions and other light particles. core collapse simulations used in the literature to substantiate the bound omitted from the calculation the envelope exterior to the proto-neutron star (pns). as a result, the only source of neutrinos in these s... | is there a supernova bound on axions? |
stellar dynamos generate magnetic fields that are of fundamental importance to the variability and evolution of sun-like and low-mass stars, and for the development of their planetary systems. as a key to understanding stellar dynamos, empirical relations between stellar parameters and magnetic fields are required for ... | magnetism, rotation, and nonthermal emission in cool stars. average magnetic field measurements in 292 m dwarfs |
pair instabilities in supernovae might prevent the formation of black holes with masses between ∼50 m⊙ and ∼130 m⊙ . multiple generations of black-hole mergers provide a possible way to populate this "mass gap" from below. however this requires an astrophysical environment with a sufficiently large escape speed to reta... | escape speed of stellar clusters from multiple-generation black-hole mergers in the upper mass gap |
the recent detection of gw190814 featured the merger of a binary with a primary having a mass of $\sim 23\, \mathrm{ m}_{\odot }$ and a secondary with a mass of $\sim 2.6\, \mathrm{ m}_{\odot }$ . while the primary was most likely a black hole, the secondary could be interpreted as either the lightest black hole or the... | a lower bound on the maximum mass if the secondary in gw190814 was once a rapidly spinning neutron star |
solar probe cup (spc) is a faraday cup instrument on board nasa's parker solar probe (psp) spacecraft designed to make rapid measurements of thermal coronal and solar wind plasma. the spacecraft is in a heliocentric orbit that takes it closer to the sun than any previous spacecraft, allowing measurements to be made whe... | the solar probe cup on the parker solar probe |
contact. the star formation rate (sfr) in high-redshift galaxies is expected due to competing physical processes. this stochastic variability might boost the luminosity of galaxies and might explain the over-abundance seen at z ≳ 10 by the james webb space telescope.aims: we quantify the amplitude and timescales of thi... | stochastic star formation in early galaxies: implications for the james webb space telescope |
in this work we have extended the maurya-gupta isotropic fluid solution to einstein field equations to an aniso-tropic domain. to do so, we have employed the gravitational decoupling via the minimal geometric deformation approach. the present model is representing the strange star candidate lmc x-4. a mathematical, phy... | generalized relativistic anisotropic compact star models by gravitational decoupling |
organic–inorganic hybrid perovskite materials are receiving increasing attention and becoming star materials on account of their unique and intriguing optical and electrical properties, such as high molar extinction coefficient, wide absorption spectrum, low excitonic binding energy, ambipolar carrier transport propert... | causes and solutions of recombination in perovskite solar cells |
the radius distribution of small, close-in exoplanets has recently been shown to be bimodal. the photoevaporation model predicted this bimodality. in the photoevaporation scenario, some planets are completely stripped of their primordial h/he atmospheres, whereas others retain them. comparisons between the photoevapora... | unveiling the planet population at birth |
the phangs program is building the first data set to enable the multiphase, multiscale study of star formation across the nearby spiral galaxy population. this effort is enabled by large survey programs with the atacama large millimeter/submillimeter array (alma), muse on the very large telescope, and the hubble space ... | the phangs-hst survey: physics at high angular resolution in nearby galaxies with the hubble space telescope |
the gaia early data release 3 has delivered exquisite astrometric data for 1.47 billion sources, which is revolutionizing many fields in astronomy. for a small fraction of these sources, the astrometric solutions are poor, and the reported values and uncertainties may not apply. before any analysis, it is important to ... | a classifier for spurious astrometric solutions in gaia edr3 |
using numerical hydrodynamics calculations and a novel method for densely sampling parameter space, we measure the accretion and torque on a binary system from a circumbinary disk. in agreement with some earlier studies, we find that the net torque on the binary is positive for mass ratios close to unity, and that accr... | circumbinary disks: accretion and torque as a function of mass ratio and disk viscosity |
we present a measurement of the hubble constant h0 from surface brightness fluctuation (sbf) distances for 63 bright, mainly early-type galaxies out to 100 mpc observed with the wfc3/ir on the hubble space telescope (hst). the sample is drawn from several independent hst imaging programs using the f110w bandpass, with ... | the hubble constant from infrared surface brightness fluctuation distances |
we report our spitzer space telescope observations and detections of the binary neutron star merger gw170817. at 4.5 μm, gw170817 is detected at 21.9 mag ab at +43 days and 23.9 mag ab at +74 days after merger. at 3.6 μm, gw170817 is not detected to a limit of 23.2 mag ab at +43 days and 23.1 mag ab at +74 days. our de... | spitzer mid-infrared detections of neutron star merger gw170817 suggests synthesis of the heaviest elements |
we present results from the first population synthesis study of protostellar discs. we analyse the evolution and properties of a large sample of protostellar discs formed in a radiation hydrodynamical simulation of star cluster formation. due to the chaotic nature of the star formation process, we find an enormous dive... | on the diversity and statistical properties of protostellar discs |
we present galaxy stellar mass functions (gsmfs) at z = 4-8 from a rest-frame ultraviolet (uv) selected sample of ∼4500 galaxies, found via photometric redshifts over an area of ∼280 arcmin2 in the cosmic assembly near-infrared deep extragalactic legacy survey (candels)/great observatories origins deep survey (goods) f... | the evolution of the galaxy stellar mass function at z = 4-8: a steepening low-mass-end slope with increasing redshift |
we include a fully coupled treatment of metal and dust enrichment into the delphi semi-analytic model of galaxy formation to explain the dust content of 13 lyman break galaxies (lbgs) detected by the atacama large millimetre array (alma) rebels large program at z ≃ 7. we find that the galaxy dust mass, md, is regulated... | the alma rebels survey: the dust content of z 7 lyman break galaxies |
the california-kepler survey (cks) is an observational program developed to improve our knowledge of the properties of stars found to host transiting planets by nasa’s kepler mission. the improvement stems from new high-resolution optical spectra obtained using hires at the w. m. keck observatory. the cks stellar sampl... | the california-kepler survey. i. high-resolution spectroscopy of 1305 stars hosting kepler transiting planets |
in this article, we attempt to find a singularity free solution of einstein's field equations for compact stellar objects, precisely strange (quark) stars, considering schwarzschild metric as the exterior spacetime. to this end, we consider that the stellar object is spherically symmetric, static and anisotropic in nat... | relativistic model for anisotropic strange stars |
i review the spatially resolved spectroscopic properties of low-redshift star-forming galaxies (and their retired counterparts) using results from the most recent optical integral field spectroscopy galaxy surveys. first, i briefly summarize the global spectroscopic properties of these galaxies, discussing the main ion... | spatially resolved spectroscopic properties of low-redshift star-forming galaxies |
the merger of neutron stars drives a relativistic jet which can be observed as a short gamma-ray burst. a strong large-scale magnetic field is necessary to launch the relativistic jet. however, the magnetohydrodynamical mechanism to build up this magnetic field remains uncertain. here we show that the $\alpha\omega$ dy... | a large-scale magnetic field via $\\alpha\\omega$ dynamo in binary neutron star mergers |
we present results of a spectroscopic survey for new k- and m-type members of scorpius-centaurus (sco-cen), the nearest ob association (∼100-200 pc). using an x-ray, proper motion and colour-magnitude selected sample, we obtained spectra for 361 stars, for which we report spectral classifications and li and hα equivale... | the star formation history and accretion-disc fraction among the k-type members of the scorpius-centaurus ob association |
the galaxy evolution explorer (galex) imaged the sky in two ultraviolet (uv) bands, far-uv (fuv, λ eff ∼ 1528 å), and near-uv (nuv, λ eff ∼ 2310 å), delivering the first comprehensive sky surveys at these wavelengths. the galex database contains fuv and nuv images, ∼500 million source measurements and over 100,000 low-... | revised catalog of galex ultraviolet sources. i. the all-sky survey: guvcat_ais |
a wealth of extragalactic populations completely missed at uv-optical wavelengths has been identified in the last decade, combining the deepest hst and spitzer observations. these dark sources are thought to be dusty and star-forming systems at 3 < z < 5, and major contributors to the stellar mass build up. in th... | jwst unveils heavily obscured (active and passive) sources up to z 13 |
we present a catalog of uniformly determined stellar properties and abundances for 1,617 f, g, and k stars using an automated spectral synthesis modeling procedure. all stars were observed using the hires spectrograph at keck observatory. our procedure used a single line list to fit model spectra to observations of all... | spectral properties of cool stars: extended abundance analysis of 1,617 planet-search stars |
we present teobresums, a new effective-one-body (eob) waveform model for nonprecessing (spin-aligned) and tidally interacting compact binaries. spin-orbit and spin-spin effects are blended together by making use of the concept of centrifugal eob radius. the point-mass sector through merger and ringdown is informed by n... | time-domain effective-one-body gravitational waveforms for coalescing compact binaries with nonprecessing spins, tides, and self-spin effects |
a central challenge in gravitational wave astronomy is identifying weak signals in the presence of non-stationary and non-gaussian noise. the separation of gravitational wave signals from noise requires good models for both. when accurate signal models are available, such as for binary neutron star systems, it is possi... | bayeswave: bayesian inference for gravitational wave bursts and instrument glitches |
we report on the detailed analysis of a gravitationally lensed y-band dropout, a2744_yd4, selected from deep hubble space telescope imaging in the frontier field cluster abell 2744. band 7 observations with the atacama large millimeter/submillimeter array (alma) indicate the proximate detection of a significant 1 mm co... | dust in the reionization era: alma observations of a z = 8.38 gravitationally lensed galaxy |
we study the formation and the subsequent mass growth of axion stars inside axion miniclusters. numerically solving the schrödinger-poisson equations with realistic initial conditions we find that the axion stars exhibit similar properties to solitonic cores in ultralight bosonic dark matter halos in terms of their rad... | formation and mass growth of axion stars in axion miniclusters |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.