abstract stringlengths 3 192k | title stringlengths 4 857 |
|---|---|
to constrain the formation history of an exoplanet, we need to know its chemical composition1-3. with an equilibrium temperature of about 4,050 kelvin4, the exoplanet kelt-9b (also known as hd 195689b) is an archetype of the class of ultrahot jupiters that straddle the transition between stars and gas-giant exoplanets ... | atomic iron and titanium in the atmosphere of the exoplanet kelt-9b |
fast radio bursts (frbs) are brief, intense flashes of radio waves from unidentified extragalactic sources. polarized frbs originate in highly magnetized environments. we report observations of the repeating frb 20190520b spanning 17 months, which show that the frb’s faraday rotation is highly variable and twice change... | magnetic field reversal in the turbulent environment around a repeating fast radio burst |
the growing population of binary black holes (bbhs) observed by gravitational wave (gw) detectors is a potential rosetta stone for understanding their formation channels. here, we use an upgraded version of our semi-analytical codes fastcluster and cosmo $\mathcal {r}$ate to investigate the cosmic evolution of four dif... | the cosmic evolution of binary black holes in young, globular, and nuclear star clusters: rates, masses, spins, and mixing fractions |
we present the evolution of black holes (bhs) and their relationship with their host galaxies in astrid, a large-volume cosmological hydrodynamical simulation with box size 250 h-1mpc containing 2 × 55003 particles evolved to z = 3. astrid statistically models bh gas accretion and active galactic nucleus (agn) feedback... | the astrid simulation: the evolution of supermassive black holes |
the process of superradiance can extract angular momentum and energy from astrophysical black holes (bhs) to populate gravitationally bound states with an exponentially large number of light bosons. we analytically calculate superradiant growth rates for vectors around rotating bhs in the regime where the vector compto... | black hole superradiance signatures of ultralight vectors |
we report new searches for solar axions and galactic axionlike dark matter particles, using the first low-background data from the pandax-ii experiment at china jinping underground laboratory, corresponding to a total exposure of about 2.7 ×104 kg day . no solar axion or galactic axionlike dark matter particle candidat... | limits on axion couplings from the first 80 days of data of the pandax-ii experiment |
atmospheric compositions can provide powerful diagnostics of formation and migration histories of planetary systems. we investigate constraints on atmospheric abundances of h2o, na, and k, in a sample of transiting exoplanets using the latest transmission spectra and new h2 broadened opacities of na and k. our sample o... | mass-metallicity trends in transiting exoplanets from atmospheric abundances of h2o, na, and k |
we analyze the stellar ages obtained from a combination of lick indices in borghi et al. for 140 massive and passive galaxies selected in the lega-c survey at 0.6 < z < 0.9. from their median age-redshift relation, we derive a new direct measurement of h(z) without any cosmological model assumption using the cosm... | toward a better understanding of cosmic chronometers: a new measurement of h(z) at z 0.7 |
we use the panchromatic spectral energy distribution (sed)-fitting code prospector to measure the galaxy logm*-logsfr relationship (the star-forming sequence) across 0.2 < z < 3.0 using the cosmos-2015 and 3d-hst uv-ir photometric catalogs. we demonstrate that the chosen method of identifying star-forming galaxie... | a new census of the 0.2 < z < 3.0 universe. ii. the star-forming sequence |
when determining absolute ages of identifiably young stellar populations, results strongly depend on which stars are studied. cooler (k, m) stars typically yield ages that are systematically younger than warmer (a, f, g) stars by a factor of two. i explore the possibility that these age discrepancies are the result of ... | magnetic inhibition of convection and the fundamental properties of low-mass stars. iii. a consistent 10 myr age for the upper scorpius ob association |
we present an end-to-end, two-phase model for the origin of globular clusters (gcs). in the model, populations of stellar clusters form in the high-pressure discs of high-redshift (z > 2) galaxies (a rapid-disruption phase due to tidal perturbations from the dense interstellar medium), after which the galaxy mergers... | globular clusters as the relics of regular star formation in `normal' high-redshift galaxies |
we report chandra observations of gw170817, the first neutron star-neutron star merger discovered by the joint ligo-virgo collaboration, and the first direct detection of gravitational radiation associated with an electromagnetic counterpart, fermi short γ-ray burst grb 170817a. the event occurred on 2017 august 17 and... | a deep chandra x-ray study of neutron star coalescence gw170817 |
the detonation of a sub-chandrasekhar-mass white dwarf (wd) has emerged as one of the most promising type ia supernova (sn ia) progenitor scenarios. recent studies have suggested that the rapid transfer of a very small amount of helium from one wd to another is sufficient to ignite a helium shell detonation that subseq... | sub-chandrasekhar-mass white dwarf detonations revisited |
understanding the impact of active m-dwarf stars on the atmospheric equilibrium and surface conditions of a habitable zone earth-like planet is key to assessing m dwarf planet habitability. previous modeling of the impact of electromagnetic (em) radiation and protons from a single large flare on an earth-like atmospher... | modeling repeated m dwarf flaring at an earth-like planet in the habitable zone: atmospheric effects for an unmagnetized planet |
we build on the evidence provided by our legacy survey of galactic globular clusters (gc) to submit to a crucial test four scenarios currently entertained for the formation of multiple stellar generations in gcs. the observational constraints on multiple generations to be fulfilled are manifold, including gc specificit... | the hubble space telescope uv legacy survey of galactic globular clusters - v. constraints on formation scenarios |
we present an improved measurement of the carbon-nitrogen-oxygen (cno) solar neutrino interaction rate at earth obtained with the complete borexino phase-iii dataset. the measured rate, rcno=6.7-0.8+2.0 counts/(day ×100 tonnes ) , allows us to exclude the absence of the cno signal with about 7 σ c.l. the correspondent ... | improved measurement of solar neutrinos from the carbon-nitrogen-oxygen cycle by borexino and its implications for the standard solar model |
the detection of gw170817 in gravitational waves provides unprecedented constraints on the equation of state (eos) of the ultradense matter within the cores of neutron stars (nss). we extend the nonparametric analysis first introduced by landry and essick (2019), and confirm that gw170817 favors soft eoss. we infer mac... | nonparametric inference of neutron star composition, equation of state, and maximum mass with gw170817 |
neutrinos in core-collapse supernovae and neutron-star mergers are susceptible to flavor instabilities of three kinds: slow, fast, and collisional. prior work has established mappings of the first two onto abstract mechanical systems in flavor space, respectively named the slow and fast flavor pendula. here we introduc... | collisional flavor pendula and neutrino quantum thermodynamics |
in dense astrophysical environments, notably core-collapse supernovae and neutron star mergers, neutrino-neutrino forward scattering can spawn flavor conversion on very short scales. scattering with the background medium can impact collective flavor conversion in various ways, either damping oscillations or possibly se... | collisions and collective flavor conversion: integrating out the fast dynamics |
by combining the jwst/nircam jades and ceers extragalactic datasets, we have uncovered a sample of twenty-one t and y brown dwarf candidates at best-fit distances between 0.1 - 4.2 kpc. these sources were selected by targeting the blue 1$\mu$m - 2.5$\mu$m colors and red 3$\mu$m - 4.5$\mu$m colors that arise from molecu... | brown dwarf candidates in the jades and ceers extragalactic surveys |
we study the radioactively powered transients produced by accretion disc winds following a compact object merger. based on the outflows found in two-dimensional hydrodynamical disc models, we use wavelength-dependent radiative transfer calculations to generate synthetic light curves and spectra. we show that resulting ... | kilonova light curves from the disc wind outflows of compact object mergers |
over this last year we have published four independent refereed studies confirming the presence of a gravitational anomaly, from studying the relative velocities and separations on the plane of the sky, $v_{2d}$ and $s_{2d}$ respectively, of wide binary stars observed by the {\it gaia} satellite. these studies show res... | on the methodological shortcomings in the wide binary gravity test of banik et al. 2024 |
we report the discovery of the closest known black hole candidate as a binary companion to v723 mon. v723 mon is a nearby ($d\sim 460\, \rm pc$), bright (v ≃ 8.3 mag), evolved (teff, giant ≃ 4440 k, and lgiant ≃ 173 l⊙) red giant in a high mass function, f(m) = 1.72 ± 0.01 m⊙, nearly circular binary (p = 59.9 d, e ≃ 0)... | a unicorn in monoceros: the 3 m⊙ dark companion to the bright, nearby red giant v723 mon is a non-interacting, mass-gap black hole candidate |
young star clusters are the most common birthplace of massive stars and are dynamically active environments. here, we study the formation of black holes (bhs) and binary black holes (bbhs) in young star clusters, by means of 6000 n-body simulations coupled with binary population synthesis. we probe three different stel... | binary black holes in young star clusters: the impact of metallicity |
stars are extremely important astronomical objects that constitute the pillars on which the universe is built, and as such, their study has gained increasing interest over the years. white dwarf stars are not the exception. indeed, these stars constitute the final evolutionary stage for more than 95% of all stars. the ... | pulsating white dwarfs: new insights |
the structure of magnetic flux ropes injected into the solar wind during reconnection in the coronal atmosphere is explored with particle-in-cell simulations and compared with in situ measurements of magnetic "switchbacks" from the parker solar probe. we suggest that multi-x-line reconnection between open and closed fl... | switchbacks as signatures of magnetic flux ropes generated by interchange reconnection in the corona |
models for black hole (bh) formation from stellar evolution robustly predict the existence of a pair-instability supernova (pisn) mass gap in the range ∼50 to ∼120 solar masses. this theoretical prediction is supported by the binary black holes (bbhs) of ligo/virgo's first two observing runs, whose component masses are... | minding the gap: gw190521 as a straddling binary |
context. the medium-resolution spectrometer (mrs) provides one of the four operating modes of the mid-infrared instrument (miri) on board the james webb space telescope (jwst). the mrs is an integral field spectrometer, measuring the spatial and spectral distributions of light across the 5-28 µm wavelength range with a... | jwst miri flight performance: the medium-resolution spectrometer |
we present a novel strategy to systematically study complex-structure moduli stabilization in type iib and f-theory flux compactifications. in particular, we determine vacua in any asymptotic regime of the complex-structure moduli space by exploiting powerful tools of asymptotic hodge theory. in a leading approximation... | moduli stabilization in asymptotic flux compactifications |
the near-infrared imager and slitless spectrograph (niriss) is the science module of the canadian-built fine guidance sensor onboard the james webb space telescope (jwst). niriss has four observing modes: (1) broadband imaging featuring seven of the eight nircam broadband filters, (2) wide-field slitless spectroscopy a... | the near infrared imager and slitless spectrograph for the james webb space telescope. i. instrument overview and in-flight performance |
we investigate the bright co fundamental emission in the central regions of five class 0 protostars using the jwst's near-infrared spectrograph (nirspec) and provide clues to what processes excite the gas. co line emission images are extracted for a forest of $\sim$150 ro-vibrational transitions from two vibrational ba... | ipa. class 0 protostars viewed in co emission using jwst/nirspec |
it has recently become possible to zoom-in from cosmological to sub-pc scales in galaxy simulations to follow accretion onto supermassive black holes (smbhs). however, at some point the approximations used on ism scales (e.g. optically-thin cooling and stellar-population-integrated star formation [sf] and feedback [fb]... | forge'd in fire: resolving the end of star formation and structure of agn accretion disks from cosmological initial conditions |
we present early-stage analyses of low-resolution (r = 1000) optical spectra and near-infrared light curves of the bright type ii supernova (sn ii) 2023ixf in the notable nearby face-on spiral galaxy m 101, which were obtained from t = 1.7 to 8.0 d. our first spectrum showed remarkable emission features of the balmer s... | bright type ii supernova 2023ixf in m 101: a quick analysis of the early-stage spectra and near-infrared light curves |
planet-forming disc evolution is not independent of the star formation and feedback process in giant molecular clouds. in particular, ob stars emit uv radiation that heats and disperses discs in a process called `external photoevaporation'. this process is understood to be the dominant environmental influence acting on... | the external photoevaporation of planet-forming discs |
when the primary star in a close binary system evolves into a giant and engulfs its companion, its core and the companion temporarily orbit each other inside a common envelope. drag forces transfer orbital energy and angular momentum to the envelope material. depending on the efficiency of this process, the envelope ma... | simulations of common-envelope evolution in binary stellar systems: physical models and numerical techniques |
the tidal love numbers (tlns) encode the deformability of a self-gravitating object immersed in a tidal environment and depend significantly both on the object's internal structure and on the dynamics of the gravitational field. an intriguing result in classical general relativity is the vanishing of the tlns of black ... | testing strong-field gravity with tidal love numbers |
we use observations of ultra-faint dwarf (ufd) galaxies to constrain the particle mass of ultra-light dark matter. potential fluctuations created by wave interference in virialized "fuzzy" dark matter (fdm) halos dynamically heat stellar orbits in ufds, some of which exhibit velocity dispersions of $\lesssim$ 3 km/s an... | not so fuzzy: excluding fdm with sizes and stellar kinematics of ultra-faint dwarf galaxies |
seven rocky planets orbit the nearby dwarf star trappist-1, providing a unique opportunity to search for atmospheres on small planets outside the solar system1. thanks to the recent launch of the james webb space telescope (jwst), possible atmospheric constituents such as carbon dioxide (co2) are now detectable2,3. rec... | no thick carbon dioxide atmosphere on the rocky exoplanet trappist-1 c |
we present alma deep spectroscopy for a lensed galaxy at $z_{\rm spec}=8.496$ with $\log(m_{\rm star}/m_{\odot})\sim7.8$ whose optical nebular lines and stellar continuum are detected by jwst/nirspec and nircam early release observations in smacs0723. our alma spectrum shows [oiii]88$\mu$m and [cii]158$\mu$m line detec... | jwst and alma multiple-line study in and around a galaxy at $z=8.496$: optical to fir line ratios and the onset of an outflow promoting ionizing photon escape |
the early universe, spanning 400,000 to 400 million years after the big bang ($z\approx1100-11$), has been left largely unexplored as the light from luminous objects is too faint to be observed directly. while new experiments are pushing the redshift limit of direct observations, measurements in the low-frequency radio... | constraining the properties of population iii galaxies with multi-wavelength observations |
we make use of sensitive (9.3 μjy beam-1 rms) 1.2 mm continuum observations from the atacama large millimeter/submillimeter array (alma) spectroscopic survey in the hubble ultra-deep field (aspecs) large program to probe dust-enshrouded star formation from 1362 lyman-break galaxies spanning the redshift range z = 1.5-1... | the alma spectroscopic survey large program: the infrared excess of z = 1.5-10 uv-selected galaxies and the implied high-redshift star formation history |
the discovery and characterization of exoplanets around nearby stars is driven by profound scientific questions about the uniqueness of earth and our solar system, and the conditions under which life could exist elsewhere in our galaxy. doppler spectroscopy, or the radial velocity (rv) technique, has been used extensiv... | stellar spectroscopy in the near-infrared with a laser frequency comb |
pair-instability (pi) is expected to open a gap in the mass spectrum of black holes (bhs) between ≈40-65 and ≈120 m⊙. the existence of the mass gap is currently being challenged by the detection of gw190521, with a primary component mass of $85^{+21}_{-14}$ m⊙. here, we investigate the main uncertainties on the pi mass... | formation of gw190521 from stellar evolution: the impact of the hydrogen-rich envelope, dredge-up, and 12c(α, γ)16o rate on the pair-instability black hole mass gap |
we perform an extensive numerical study of the evolution of massive binary systems to predict the peculiar velocities that stars obtain when their companion collapses and disrupts the system. our aim is to (i) identify which predictions are robust against model uncertainties and assess their implications, (ii) investig... | massive runaway and walkaway stars. a study of the kinematical imprints of the physical processes governing the evolution and explosion of their binary progenitors |
we perform a statistical standard siren analysis of gw170817. our analysis does not utilize knowledge of ngc 4993 as the unique host galaxy of the optical counterpart to gw170817. instead, we consider each galaxy within the gw170817 localization region as a potential host; combining the redshifts from all of the galaxi... | a standard siren measurement of the hubble constant from gw170817 without the electromagnetic counterpart |
we present the first sample of tidal disruption events (tdes) discovered during the srg all-sky survey. these 13 events were selected among x-ray transients detected in the 0° < l < 180° hemisphere by erosita during its second sky survey (2020 june 10 to december 14) and confirmed by optical follow-up observation... | first tidal disruption events discovered by srg/erosita: x-ray/optical properties and x-ray luminosity function at z < 0.6 |
we carry out 2d viscous hydrodynamical simulations of circumbinary accretion using the moving-mesh code arepo. we self-consistently compute the accretion flow over a wide range of spatial scales, from the circumbinary disk (cbd) far from the central binary, through accretion streamers, to the disks around individual bi... | hydrodynamics of circumbinary accretion: angular momentum transfer and binary orbital evolution |
magnetic reconnection, topological changes in magnetic fields, is a fundamental process in magnetized plasmas. it is associated with energy release in regions of magnetic field annihilation, but this is only one facet of this process. astrophysical fluid flows normally have very large reynolds numbers and are expected ... | 3d turbulent reconnection: theory, tests, and astrophysical implications |
we present a new, open source, free, semi-analytic model (sam) of galaxy formation, shark, designed to be highly flexible and modular, allowing easy exploration of different physical processes and ways of modelling them. we introduce the philosophy behind shark and provide an overview of the physical processes included... | shark: introducing an open source, free, and flexible semi-analytic model of galaxy formation |
we show that the electron recoil excess around 2 kev claimed by the xenon collaboration can be fitted by dark matter (dm) or dm-like particles having a fast component with velocity of order ∼0.1 . those particles cannot be part of the cold dm halo of our galaxy, so we speculate about their possible nature and origin, s... | dark matter and the xenon1t electron recoil excess |
context. establishing the number of faint active galactic nuclei (agns) at z = 4-6 is crucial to understanding their cosmological importance as main contributors to the reionization of the universe.aims: in order to derive the agn contribution to the cosmological ionizing emissivity we have selected faint agn candidate... | faint agns at z > 4 in the candels goods-s field: looking for contributors to the reionization of the universe |
we exploit james webb space telescope (jwst) nircam observations from the glass-jwst-early release science program to investigate galaxy stellar masses at z > 7. we first show that jwst observations reduce the uncertainties on the stellar mass by a factor of at least 5-10, when compared with the highest-quality data... | early results from glass-jwst. xi. stellar masses and mass-to-light ratio of z > 7 galaxies |
we propose a set of standard assumptions for the modelling of class ii and iii protoplanetary disks, which includes detailed continuum radiative transfer, thermo-chemical modelling of gas and ice, and line radiative transfer from optical to cm wavelengths. the first paper of this series focuses on the assumptions about... | consistent dust and gas models for protoplanetary disks. i. disk shape, dust settling, opacities, and pahs |
recent studies have shown that atmospheric mass-loss powered by the cooling luminosity of a planet's core can explain the observed radius valley separating super-earths and sub-neptunes, even without photoevaporation. in this work, we investigate the dependence of this core-powered mass-loss mechanism on stellar mass (... | signatures of the core-powered mass-loss mechanism in the exoplanet population: dependence on stellar properties and observational predictions |
galactic haloes in a λ-cdm universe are predicted to host today a swarm of debris resulting from cannibalized dwarf galaxies. the chemodynamical information recorded in their stellar populations helps elucidate their nature, constraining the assembly history of the galaxy. using data from apogee and gaia, we examine th... | the chemical characterization of halo substructure in the milky way based on apogee |
the 2017 detection of the inspiral and merger of two neutron stars in gravitational waves and gamma rays was accompanied by a quickly reddening transient. such a transient was predicted to occur following a rapid neutron capture (r-process) nucleosynthesis event, which synthesizes neutron-rich, radioactive nuclei and c... | full transport model of gw170817-like disk produces a blue kilonova |
the electromagnetic transients accompanying compact binary mergers (γ-ray bursts, afterglows and `macronovae') are crucial to pinpoint the sky location of gravitational wave sources. macronovae are caused by the radioactivity from freshly synthesized heavy elements, e.g. from dynamic ejecta and various types of winds. ... | impact of ejecta morphology and composition on the electromagnetic signatures of neutron star mergers |
the formation of planets depends on the underlying protoplanetary disc structure, which in turn influences both the accretion and migration rates of embedded planets. the disc itself evolves on time scales of several myr, during which both temperature and density profiles change as matter accretes onto the central star... | the growth of planets by pebble accretion in evolving protoplanetary discs |
in the present investigation an exact generalised model for anisotropic compact stars of embedding class 1 is sought with a general relativistic background. the generic solutions are verified by exploring different physical aspects, viz. energy conditions, mass-radius relation, stability of the models, in connection to... | generalised model for anisotropic compact stars |
the origin of cosmic high-energy neutrinos remains largely unexplained. for high-energy neutrino alerts from icecube, a coincidence with time-variable emission has been seen for three different types of accreting black holes: (1) a gamma-ray flare from a blazar (txs 0506+056), (2) an optical transient following a stell... | establishing accretion flares from massive black holes as a major source of high-energy neutrinos |
uvex is a proposed medium class explorer mission designed to provide crucial missing capabilities that will address objectives central to a broad range of modern astrophysics. the uvex design has two co-aligned wide-field imagers operating in the fuv and nuv and a powerful broadband medium resolution spectrometer. in i... | science with the ultraviolet explorer (uvex) |
the gaia sausage is an elongated structure in velocity space discovered by belokurov et al. using the kinematics of metal-rich halo stars. they showed that it could be created by a massive dwarf galaxy (∼5 × 1010 {m}⊙ ) on a strongly radial orbit that merged with the milky way at a redshift z ≲ 3. this merger would als... | the sausage globular clusters |
the tip of the red giant branch has been used to measure distances to 500 nearby galaxies with the hubble space telescope (hst) which are available in the color-magnitude diagrams and tip of the red giant branch (cmds/trgb) catalog on the extragalactic distance database (edd). our established methods are employed to pe... | comparing tip of the red giant branch distance scales: an independent reduction of the carnegie-chicago hubble program and the value of the hubble constant |
in many cosmologies dark matter clusters on subkiloparsec scales and forms compact subhalos, in which the majority of galactic dark matter could reside. null results in direct detection experiments since their advent four decades ago could then be the result of extremely rare encounters between the earth and these subh... | scattering searches for dark matter in subhalos: neutron stars, cosmic rays, and old rocks |
we present a detailed overview of the science goals and predictions for the prime-cam direct-detection camera-spectrometer being constructed by the ccat-prime collaboration for dedicated use on the fred young submillimeter telescope (fyst). the fyst is a wide-field, 6 m aperture submillimeter telescope being built (fir... | ccat-prime collaboration: science goals and forecasts with prime-cam on the fred young submillimeter telescope |
the first systematic study of opacity dependence on atomic number at stellar interior temperatures is used to evaluate discrepancies between measured and modeled iron opacity [j. e. bailey et al., nature (london) 517, 56 (2015), 10.1038/nature14048]. high-temperature (>180 ev ) chromium and nickel opacities are meas... | systematic study of l -shell opacity at stellar interior temperatures |
we introduce the modelling star cluster population assembly in cosmological simulations within eagle (e-mosaics) project. e-mosaics incorporates models describing the formation, evolution, and disruption of star clusters into the eagle galaxy formation simulations, enabling the examination of the co-evolution of star c... | the e-mosaics project: simulating the formation and co-evolution of galaxies and their star cluster populations |
we present new measurements of the quasar luminosity function (lf) at z ∼ 6 over an unprecedentedly wide range of the rest-frame ultraviolet luminosity m 1450 from -30 to -22 mag. this is the fifth in a series of publications from the subaru high-z exploration of low-luminosity quasars (shellqs) project, which exploits... | subaru high-zexploration of low-luminosity quasars (shellqs). v. quasar luminosity function and contribution to cosmic reionization at z = 6 |
we introduce massive black holes (bhs) in the feedback in realistic environments (fire) project and perform high-resolution cosmological hydrodynamic simulations of quasar-mass haloes [mhalo(z = 2) ≈ 1012.5 m⊙] down to z = 1. these simulations model stellar feedback by supernovae, stellar winds and radiation, and bh gr... | black holes on fire: stellar feedback limits early feeding of galactic nuclei |
we present the first volume-limited sample of cataclysmic variables (cvs), selected using the accurate parallaxes provided by the second data release (dr2) of the european space agency gaia space mission. the sample is composed of 42 cvs within 150 pc, including two new systems discovered using the gaia data, and is $(... | a volume-limited sample of cataclysmic variables from gaia dr2: space density and population properties |
in 2021 may, the dark energy spectroscopic instrument (desi) began a 5 yr survey of approximately 50 million total extragalactic and galactic targets. the primary desi dark-time targets are emission line galaxies, luminous red galaxies, and quasars. in bright time, desi will focus on two surveys known as the bright gal... | the target-selection pipeline for the dark energy spectroscopic instrument |
the transformation of cold neutral intergalactic hydrogen into a highly ionized warm plasma marks the end of the cosmic dark ages and the beginning of the age of galaxies. the details of this process reflect the nature of the early sources of radiation and heat, the statistical characteristics of the large-scale struct... | modeling cosmic reionization |
we present new theoretical stellar yields and surface abundances for three grids of metal-rich asymptotic giant branch (agb) models. post-processing nucleosynthesis results are presented for stellar models with initial masses between 1 m ⊙ and 7.5 m ⊙ for z = 0.007, and 1 m ⊙ and 8 m ⊙ for z = 0.014 (solar) and z = 0.0... | stellar yields from metal-rich asymptotic giant branch models |
aims: we present new gravity and limb-darkening coefficients for a wide range of effective temperatures, gravities, metallicities, and microturbulent velocities. these coefficients can be used in many different fields of stellar physics as synthetic light curves of eclipsing binaries and planetary transits, stellar dia... | limb and gravity-darkening coefficients for the tess satellite at several metallicities, surface gravities, and microturbulent velocities |
a homogeneous search for stellar flares has been performed using every available kepler light curve. an iterative light curve de-trending approach was used to filter out both astrophysical and systematic variability to detect flares. the flare recovery completeness has also been computed throughout each light curve usi... | the kepler catalog of stellar flares |
literature data are collated for 38 stripped-envelope core-collapse supernovae (se sne; i.e. sne iib, ib, ic and ic-bl) that have good light-curve coverage in more than one optical band. using bolometric corrections derived in previous work, the bolometric light curve of each sn is recovered and template bolometric lig... | bolometric light curves and explosion parameters of 38 stripped-envelope core-collapse supernovae |
one of the striking observations from the parker solar probe (psp) spacecraft is the prevalence in the inner heliosphere of large amplitude, alfvénic magnetic field reversals termed switchbacks. these $\delta {b}_{r}/b\sim { \mathcal o }(1$ ) fluctuations occur over a range of timescales and in patches separated by int... | a solar source of alfvénic magnetic field switchbacks: in situ remnants of magnetic funnels on supergranulation scales |
we survey our understanding of classical novae-nonterminal, thermonuclear eruptions on the surfaces of white dwarfs in binary systems. the recent and unexpected discovery of gev gamma rays from galactic novae has highlighted the complexity of novae and their value as laboratories for studying shocks and particle accele... | new insights into classical novae |
we present a systematic numerical relativity study of the dynamical ejecta, winds, and nucleosynthesis in neutron star (ns) merger remnants. binaries with the chirp mass compatible with gw170817, different mass ratios, and five microphysical equations of state (eoss) are simulated with an approximate neutrino transport... | numerical relativity simulations of the neutron star merger gw170817: long-term remnant evolutions, winds, remnant disks, and nucleosynthesis |
context. three-dimensional maps of the galactic interstellar medium are general astrophysical tools. reddening maps may be based on the inversion of color excess measurements for individual target stars or on statistical methods using stellar surveys. three-dimensional maps based on diffuse interstellar bands (dibs) ha... | three-dimensional mapping of the local interstellar medium with composite data |
we determine the orbital eccentricities of individual small kepler planets, through a combination of asteroseismology and transit light-curve analysis. we are able to constrain the eccentricities of 51 systems with a single transiting planet, which supplement our previous measurements of 66 planets in multi-planet syst... | the orbital eccentricity of small planet systems |
the analysis of the central compact object within the supernova remnant hess j1731-347 suggests that it has a small radius and, even more interestingly, a mass of the order or smaller than one solar mass. this raises the question of which astrophysical process could lead to such a small mass, since the analysis of vari... | is the compact object associated with hess j1731-347 a strange quark star? |
we study the evolution of the scaling relations that compare the effective density ({{{σ }}}{{e}},r< {r}{{e}}) and core density ({{{σ }}}1,r< 1 kpc) to the stellar masses of star-forming galaxies (sfgs) and quiescent galaxies. these relations have been fully in place since z∼ 3 and have exhibited almost constant ... | structural and star-forming relations since z ∼ 3: connecting compact star-forming and quiescent galaxies |
with the advent of more sensitive all-sky instruments, the transient universe is being probed in greater depth than ever before. taking advantage of available resources, we have established a comprehensive database of black hole (and black hole candidate) x-ray binary (bhxb) activity between 1996 and 2015 as revealed b... | watchdog: a comprehensive all-sky database of galactic black hole x-ray binaries |
we investigate the impact of cosmic rays (crs) on the circumgalactic medium (cgm) in fire-2 simulations, for ultra-faint dwarf through milky way (mw)-mass haloes hosting star-forming (sf) galaxies. our cr treatment includes injection by supernovae, anisotropic streaming and diffusion along magnetic field lines, and col... | properties of the circumgalactic medium in cosmic ray-dominated galaxy haloes |
the equation of state (eos) of dense matter is an essential ingredient for numerical simulations of core-collapse supernovae and neutron star mergers. the properties of matter near and above nuclear saturation density are uncertain, which translates into uncertainties in astrophysical simulations and their multimesseng... | open-source nuclear equation of state framework based on the liquid-drop model with skyrme interaction |
this paper presents a cross-calibrated catalog of hipparcos and gaia astrometry to enable their use in measuring changes in proper motion, i.e., accelerations in the plane of the sky. the final catalog adopts the reference frame of the second gaia data release (dr2) and locally cross-calibrates both the scaled hipparco... | the hipparcos-gaia catalog of accelerations |
gravitational waves (gws) provide a new tool to probe the nature of dark energy (de) and the fundamental properties of gravity. we review the different ways in which gws can be used to test theories of gravity and cosmology, emphasizing models for late-time cosmic acceleration. lagrangian-based gravitational theories b... | dark energy in light of multi-messenger gravitational-wave astronomy |
high-quality collections of type ii supernova (sn) light curves are scarce because they evolve for hundreds of days, making follow-up observations time consuming and often extending over multiple observing seasons. in light of these difficulties, the diversity of sne ii is not fully understood. here we present ultravio... | the diversity of type ii supernova versus the similarity in their progenitors |
we perform neutrino radiation-hydrodynamics simulations for the merger of asymmetric binary neutron stars in numerical relativity. neutron stars are modeled by soft and moderately stiff finite-temperature equations of state (eos). we find that the properties of the dynamical ejecta such as the total mass, neutron richn... | dynamical mass ejection from the merger of asymmetric binary neutron stars: radiation-hydrodynamics study in general relativity |
in the present paper we investigate the structure of relativistic stars in 4d einstein-gauss-bonnet gravity. the mass-radius relations are obtained for realistic hadronic and for strange quark star equations of state, and for a wide range of the gauss-bonnet coupling parameter α. even though the deviations from general... | relativistic stars in 4d einstein-gauss-bonnet gravity |
in dense stellar environments, the merger products of binary black hole mergers may undergo additional mergers. these hierarchical mergers are naturally expected to have higher masses than the first generation of black holes made from stars. the components of hierarchical mergers are expected to have significant charac... | black hole genealogy: identifying hierarchical mergers with gravitational waves |
we derive and publish data-driven estimates of stellar metallicity [m/h] for ~175 million stars with low-resolution xp spectra published in gaia dr3. the [m/h] values, along with t eff and $\mathrm{log}g$ , are derived using the xgboost algorithm, trained on stellar parameters from apogee, augmented by a set of very-me... | robust data-driven metallicities for 175 million stars from gaia xp spectra |
we present results from the lyman continuum escape survey (laces), a hubble space telescope (hst) program designed to characterize the ionizing radiation emerging from a sample of lyα-emitting galaxies at redshift z ≃ 3.1. as many show intense [o iii] emission characteristic of z > 6.5 star-forming galaxies, they ma... | the lyman continuum escape survey: ionizing radiation from [o iii]-strong sources at a redshift of 3.1 |
the juno magnetic field investigation (mag) characterizes jupiter's planetary magnetic field and magnetosphere, providing the first globally distributed and proximate measurements of the magnetic field of jupiter. the magnetic field instrumentation consists of two independent magnetometer sensor suites, each consisting... | the juno magnetic field investigation |
strong solar flares and coronal mass ejections, here defined not only as the bursts of electromagnetic radiation but as the entire process in which magnetic energy is released through magnetic reconnection and plasma instability, emanate from active regions (ars) in which high magnetic non-potentiality resides in a wid... | flare-productive active regions |
using cosmological simulations, we address the properties of high-redshift star-forming galaxies (sfgs) across their main sequence (ms) in the plane of star formation rate (sfr) versus stellar mass. we relate them to the evolution of galaxies through phases of gas compaction, depletion, possible replenishment, and even... | the confinement of star-forming galaxies into a main sequence through episodes of gas compaction, depletion and replenishment |
context. the public european southern observatory spectroscopic survey of transient objects (pessto) began as a public spectroscopic survey in april 2012. pessto classifies transients from publicly available sources and wide-field surveys, and selects science targets for detailed spectroscopic and photometric follow-up... | pessto: survey description and products from the first data release by the public eso spectroscopic survey of transient objects |
the gravitational-wave astronomical revolution began in 2015 with ligo's observation of the coalescence of two stellar-mass black holes. over the coming decades, ground-based detectors like laser interferometer gravitational-wave observatory (ligo), virgo and kagra will extend their reach, discovering thousands of stel... | the missing link in gravitational-wave astronomy: discoveries waiting in the decihertz range |
in the past five years, deep imaging campaigns conducted with the hubble space telescope (hst) and ground-based observatories have delivered large samples of galaxies at 6.5<z<10, providing our first glimpse of the census of star formation activity in what is thought to be the heart of the reionization era. the s... | galaxies in the first billion years after the big bang |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.