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we present a comprehensive study of spectroscopic radius measurements of twelve neutron stars obtained during thermonuclear bursts or in quiescence. we incorporate, for the first time, a large number of systematic uncertainties in the measurement of the apparent angular sizes, eddington fluxes, and distances, in the co... | the dense matter equation of state from neutron star radius and mass measurements |
gravitational-wave astronomy has revolutionized humanity's view of the universe, a revolution driven by observations that no other field can make. this white paper describes an observatory that builds on decades of investment by the national science foundation and that will drive discovery for decades to come: cosmic e... | cosmic explorer: a submission to the nsf mpsac nggw subcommittee |
by numerically inverting the tolman-oppenheimer-volkov (tov) equation using an explicitly isospin-dependent parametric equation of state (eos) of dense neutron-rich nucleonic matter, a restricted eos parameter space is established using observational constraints on the radius, maximum mass, tidal deformability and caus... | extracting nuclear symmetry energies at high densities from observations of neutron stars and gravitational waves |
stars and planets both form by accreting material from a surrounding disk. because they grow from the same material, theory predicts that there should be a relationship between their compositions. in this study, we search for a compositional link between rocky exoplanets and their host stars. we estimate the iron-mass ... | a compositional link between rocky exoplanets and their host stars |
we present a calibration of the tip of the red giant branch (trgb) in the large magellanic cloud (lmc) on the hubble space telescope (hst)/acs f814w system. we use archival hst observations to derive blending corrections and photometric transformations for two ground-based wide-area imaging surveys of the magellanic cl... | consistent calibration of the tip of the red giant branch in the large magellanic cloud on the hubble space telescope photometric system and a redetermination of the hubble constant |
chianti contains a large quantity of atomic data for the analysis of astrophysical spectra. programs are available in idl and python to perform calculation of the expected emergent spectrum from these sources. the database includes atomic energy levels, wavelengths, radiative transition probabilities, rate coefficients... | chianti—an atomic database for emission lines. xv. version 9, improvements for the x-ray satellite lines |
the mean free path of ionizing photons, λmfp, is a key factor in the photoionization of the intergalactic medium (igm). at z ≳ 5, however, λmfp may be short enough that measurements towards qsos are biased by the qso proximity effect. we present new direct measurements of λmfp that address this bias and extend up to z ... | the mean free path of ionizing photons at 5 < z < 6: evidence for rapid evolution near reionization |
in their recent study, labbé et al. used multi-band infrared images captured by the james webb space telescope (jwst) to discover a population of red massive galaxies that formed approximately 600 million years after the big bang. the authors reported an extraordinarily large density of these galaxies, with stellar mas... | confirmation of the standard cosmological model from red massive galaxies $\\sim600$ myr after the big bang |
pair-instability and pulsational pair-instability supernovae (ppisne) have not been unambiguously observed so far. they are, however, promising candidates for the progenitors of the heaviest binary black hole (bbh) mergers detected. if these bbhs are the product of binary evolution, then ppisne could occur in very clos... | pulsational pair-instability supernovae in very close binaries |
we present maps of the stellar streams detected in the gaia data release 2 (dr2) and early data release 3 (edr3) catalogs using the streamfinder algorithm. we also report the spectroscopic follow-up of the brighter dr2 stream members obtained with the high-resolution cfht/espadons and vlt/uves spectrographs as well as ... | charting the galactic acceleration field. i. a search for stellar streams with gaia dr2 and edr3 with follow-up from espadons and uves |
the set of data released as gaia early data release 3 (gaia edr3) on 3 december 2020 comprises: the full astrometric solution --- positions on the sky (α, δ), parallaxes, and proper motions --- for around 1.46 billion (1.46*109) sources, with a limiting magnitude of about g=~21 and a bright limit of about g=~3. the ast... | vizier online data catalog: gaia dr3 part 1. main source (gaia collaboration, 2022) |
direct images of protoplanets embedded in disks around infant stars provide the key to understanding the formation of gas giant planets such as jupiter. using the subaru telescope and the hubble space telescope, we find evidence for a jovian protoplanet around ab aurigae orbiting at a wide projected separation (~93 au)... | images of embedded jovian planet formation at a wide separation around ab aurigae |
the coevolution of galaxies and their metal content serves as an important test for galaxy feedback models. we analyse the distribution and evolution of metals within the illustristng simulation suite with a focus on the gas-phase mass-metallicity relation (mzr). we find that the illustristng model broadly reproduces t... | the evolution of the mass-metallicity relation and its scatter in illustristng |
we measure the hubble constant of the universe using spatial cross-correlation between gravitational wave (gw) sources without electromagnetic counterparts from the third gw transient catalog (gwtc-3), and the photometric galaxy surveys 2mpz and wise-supercosmos. using the eight well-localised gw events, we obtain hubb... | cross-correlating dark sirens and galaxies: measurement of $h_0$ from gwtc-3 of ligo-virgo-kagra |
we present the results of our year-long afterglow monitoring of gw 170817, the first binary neutron star merger detected by advanced laser interferometer gravitational-wave observatory (ligo) and advanced virgo. new observations with the australian telescope compact array and the chandra x-ray telescope were used to co... | a year in the life of gw 170817: the rise and fall of a structured jet from a binary neutron star merger |
this letter presents the first experimental observation of the attractive strong interaction between a proton and a multistrange baryon (hyperon) ξ-. the result is extracted from two-particle correlations of combined p -ξ-⊕p ¯ -ξ¯ + pairs measured in p -pb collisions at √{snn }=5.02 tev at the lhc with alice. the measu... | first observation of an attractive interaction between a proton and a cascade baryon |
we introduce a family of equations of state (eos) for hybrid neutron star (ns) matter that is obtained by a two-zone parabolic interpolation between a soft hadronic eos at low densities and a set of stiff quark matter eos at high densities within a finite region of chemical potentials μh<μ <μq . fixing the hadron... | bayesian analysis of multimessenger m-r data with interpolated hybrid eos |
galactic compact binaries with orbital periods shorter than a few hours emit detectable gravitational waves at low frequencies. their gravitational wave signals can be detected with the future laser interferometer space antenna (lisa). crucially, they may be useful in the early months of the mission operation in helpin... | lisa galactic binaries with astrometry from gaia dr3 |
elements heavier than zinc are synthesized through the rapid (r) and slow (s) neutron-capture processes. the main site of production of the r-process elements (such as europium) has been debated for nearly 60 years. initial studies of trends in chemical abundances in old milky way halo stars suggested that these elemen... | r-process enrichment from a single event in an ancient dwarf galaxy |
axionlike dark matter whose symmetry breaking occurs after the end of inflation predicts enhanced primordial density fluctuations at small scales. this leads to dense axion minihalos (or miniclusters) forming early in the history of the universe. condensation of axions in the minihalos leads to the formation and subseq... | recurrent axion stars collapse with dark radiation emission and their cosmological constraints |
this paper is the primary deliverable of the very first nasa living with a star institute working group, geomagnetically induced currents (gic) working group. the paper provides a broad overview of the current status and future challenges pertaining to the science, engineering, and applications of the gic problem. scie... | geomagnetically induced currents: science, engineering, and applications readiness |
if dark matter is composed of axions, then axion stars form in the cores of dark matter halos. these stars are unstable above a critical mass, decaying to radio photons that heat the intergalactic medium, offering a new channel for axion indirect detection. we recently provided the first accurate calculation of the axi... | axion star explosions: a new source for axion indirect detection |
mergers of binaries consisting of two neutron stars, or a black hole and a neutron star, offer a unique opportunity to study a range of physical and astrophysical processes using two different and almost orthogonal probes - gravitational waves (gw) and electromagnetic (em) emission. the gw signal probes the binary and ... | the electromagnetic counterparts of compact binary mergers |
we present a comprehensive catalog of observations and stellar population properties for 23 highly secure host galaxies of fast radio bursts (frbs). our sample comprises 6 repeating frbs and 17 apparent nonrepeaters. we present 82 new photometric and 8 new spectroscopic observations of these hosts. using stellar popula... | the demographics, stellar populations, and star formation histories of fast radio burst host galaxies: implications for the progenitors |
close binaries suppress the formation of circumstellar (s-type) planets and therefore significantly bias the inferred planet occurrence rates and statistical trends. after compiling various radial velocity and high-resolution imaging surveys, we determine that binaries with a < 1 au fully suppress s-type planets, bi... | impact of binary stars on planet statistics - i. planet occurrence rates and trends with stellar mass |
gravitational wave observations of gw170817 placed bounds on the tidal deformabilities of compact stars, allowing one to probe equations of state for matter at supranuclear densities. here we design new parametrizations for hybrid hadron-quark equations of state, which give rise to low-mass twin stars, and test them ag... | implications from gw170817 and i-love-q relations for relativistic hybrid stars |
we utilize deep near-infrared survey data from the ultravista fourth data release (dr4) and the video survey, in combination with overlapping optical and spitzer data, to search for bright star-forming galaxies at z ≳ 7.5. using a full photometric redshift fitting analysis applied to the ∼6 deg^2 of imaging searched, w... | a lack of evolution in the very bright end of the galaxy luminosity function from z ≃ 8 to 10 |
weave, the new wide-field, massively multiplexed spectroscopic survey facility for the william herschel telescope, will see first light in late 2022. weave comprises a new 2-degree field-of-view prime-focus corrector system, a nearly 1000-multiplex fibre positioner, 20 individually deployable 'mini' integral field unit... | the wide-field, multiplexed, spectroscopic facility weave: survey design, overview, and simulated implementation |
the recent direct detection of gravitational waves from a neutron star merger with optical counterpart has been used to severely constrain models of dark energy that typically predict a modification of the gravitational wave speed. however, the energy scales observed at ligo, and the particular frequency of the neutron... | gravitational rainbows: ligo and dark energy at its cutoff |
the sun, as an active star, is the driver of energetic phenomena that structure interplanetary space and affect planetary atmospheres. the effects of space weather on earth and the solar system is of increasing importance as human spaceflight is preparing for lunar and mars missions. this review is focusing on the sola... | space weather: the solar perspective |
concerning the significant increase in the negative effects of flash-floods worldwide, the main goal of this research is to evaluate the power of the analytical hierarchy process (ahp), fi (knn), k-star (ks) algorithms and their ensembles in flash-flood susceptibility mapping. to train the two stand-alone models and th... | flash-flood susceptibility assessment using multi-criteria decision making and machine learning supported by remote sensing and gis techniques |
we revisit the global 21 cm signal calculation incorporating a possible radio background at early times, and find that the global 21 cm signal shows a much stronger absorption feature, which could enhance detection prospects for future 21 cm experiments. in light of recent reports of a possible low-frequency excess rad... | enhanced global signal of neutral hydrogen due to excess radiation at cosmic dawn |
all stellar-mass black holes have hitherto been identified by x-rays emitted from gas that is accreting onto the black hole from a companion star. these systems are all binaries with a black-hole mass that is less than 30 times that of the sun1-4. theory predicts, however, that x-ray-emitting systems form a minority of... | a wide star-black-hole binary system from radial-velocity measurements |
aims: several kinematic and chemical substructures have been recently found amongst milky way halo stars with retrograde motions. it is currently unclear how these various structures are related to each other. this letter aims to shed light on this issue.methods: we explore the retrograde halo with an augmented version... | multiple retrograde substructures in the galactic halo: a shattered view of galactic history |
we report the most sensitive upper limits to date on the 21 cm epoch of reionization power spectrum using 94 nights of observing with phase i of the hydrogen epoch of reionization array (hera). using similar analysis techniques as in previously reported limits (hera collaboration 2022a), we find at 95% confidence that ... | improved constraints on the 21 cm eor power spectrum and the x-ray heating of the igm with hera phase i observations |
we report the discovery of an extremely long (∼110 mpc h-1) and dark (τeff ≳ 7) lyα trough extending down to z ≃ 5.5 towards the zem ≃ 6.0 quasar ulas j0148+0600. we use these new data in combination with lyα forest measurements from 42 quasars at 4.5 ≤ zem ≤ 6.4 to conduct an updated analysis of the line-of-sight vari... | evidence of patchy hydrogen reionization from an extreme lyα trough below redshift six |
review of the history of solar system elemental abundances with a new assessment of elemental and isotopic abundances from ci-chondrites and solar data. solar elemental abundances, or solar system elemental abundances refer to the complement of chemical elements in the entire solar system. the sun contains more than 99... | solar elemental abundances |
in this article, we have presented a static anisotropic solution of stellar compact objects for self-gravitating system by using minimal geometric deformation techniques in the framework of embedding class one space-time. for solving of this coupling system, we deform this system into two separate system through the ge... | minimally deformed anisotropic model of class one space-time by gravitational decoupling |
we investigate properties of material ejected dynamically in the merger of black hole-neutron star binaries by numerical-relativity simulations. we systematically study the dependence of ejecta properties on the mass ratio of the binary, spin of the black hole, and equation of state of the neutron-star matter. dynamica... | dynamical mass ejection from black hole-neutron star binaries |
a critical challenge to the cold dark matter (cdm) paradigm is that there are fewer satellites observed around the milky way than found in simulations of dark matter substructure. we show that there is a match between the observed satellite counts corrected by the detection efficiency of the sloan digital sky survey (f... | missing satellites problem: completeness corrections to the number of satellite galaxies in the milky way are consistent with cold dark matter predictions |
parametric models for galaxy star formation histories (sfhs) are widely used, though they are known to impose strong priors on physical parameters. this has consequences for measurements of the galaxy stellar-mass function, star formation rate density (sfrd), and star-forming main sequence (sfms). we investigate the ef... | how to measure galaxy star formation histories. i. parametric models |
we report a new binary black hole merger in the publicly available ligo first observing run (o1) data release. the event has a false alarm rate of one per six years in the detector-frame chirp-mass range mdet∈[20 ,40 ]m⊙ in a new independent analysis pipeline that we developed. our best estimate of the probability that... | highly spinning and aligned binary black hole merger in the advanced ligo first observing run |
using state-of-the-art dynamical simulations of globular clusters, including radiation reaction during black hole encounters and a cosmological model of star cluster formation, we create a realistic population of dynamically formed binary black hole mergers across cosmic space and time. we show that in the local univer... | post-newtonian dynamics in dense star clusters: formation, masses, and merger rates of highly-eccentric black hole binaries |
the kilonova emission observed following the binary neutron star merger event gw170817 provided the first direct evidence for the synthesis of heavy nuclei through the rapid neutron capture process (r process). the late-time transition in the spectral energy distribution to near-infrared wavelengths was interpreted as ... | fingerprints of heavy-element nucleosynthesis in the late-time lightcurves of kilonovae |
understanding the link between massive (≳30 m⊙) stellar black holes (bhs) and their progenitor stars is a crucial step to interpret observations of gravitational-wave events. in this paper, we discuss the final fate of very massive stars (vmss), with zero-age main sequence (zams) mass >150 m⊙, accounting for pulsati... | very massive stars, pair-instability supernovae and intermediate-mass black holes with the sevn code |
the field of planet formation is in an exciting era, where recent observations of disks around low- to intermediate-mass stars made with state of the art interferometers and high-contrast optical and ir facilities have revealed a diversity of substructures, some possibly planet-related. it is therefore important to und... | setting the stage for planet formation: measurements and implications of the fundamental disk properties |
we present two bright galaxy candidates at z ~ 12-13 identified in our h-dropout lyman break selection with 2.3 deg2 near-infrared deep imaging data. these galaxy candidates, selected after careful screening of foreground interlopers, have spectral energy distributions showing a sharp discontinuity around 1.7 μm, a fla... | a search for h-dropout lyman break galaxies at z 12-16 |
making the most of the rapidly increasing population of gravitational-wave detections of black hole (bh) and neutron star (ns) mergers requires comparing observations with population synthesis predictions. in this work, we investigate the combined impact from the key uncertainties in population synthesis modelling of t... | impact of massive binary star and cosmic evolution on gravitational wave observations - ii. double compact object rates and properties |
a knowledge of stellar ages is crucial for our understanding of many astrophysical phenomena, and yet ages can be difficult to determine. as they become older, stars lose mass and angular momentum, resulting in an observed slowdown in surface rotation. the technique of ‘gyrochronology’ uses the rotation period of a sta... | weakened magnetic braking as the origin of anomalously rapid rotation in old field stars |
context. one of the long-term goals of exoplanet science is the atmospheric characterization of dozens of small exoplanets in order to understand their diversity and search for habitable worlds and potential biosignatures. achieving this goal requires a space mission of sufficient scale that can spatially separate the ... | large interferometer for exoplanets (life). i. improved exoplanet detection yield estimates for a large mid-infrared space-interferometer mission |
the fundamental nature of dark matter is entirely unknown. a compelling candidate is twin higgs mirror matter, invisible hidden-sector cousins of the standard model particles and forces. this predicts mirror neutron stars made entirely of mirror nuclear matter. we find their structure using realistic equations of state... | mirror neutron stars |
we present a new set of solar metallicity atmosphere and evolutionary models for very cool brown dwarfs and self-luminous giant exoplanets, which we term atmo 2020. atmosphere models are generated with our state-of-the-art 1d radiative-convective equilibrium code atmo, and are used as surface boundary conditions to cal... | a new set of atmosphere and evolution models for cool t-y brown dwarfs and giant exoplanets |
we describe the first observations of the same celestial object with gravitational waves and light. gw170817 was the first detection of a neutron star merger with gravitational waves. the detection of a spatially coincident weak burst of gamma-rays (grb 170817a) 1.7 s after the merger constituted the first electromagne... | first multimessenger observations of a neutron star merger |
recently the edges collaboration reported an anomalous absorption signal in the sky-averaged 21-cm spectrum around $z=17$. such a signal may be understood as an indication for an unexpected cooling of the hydrogen gas during or prior to the so called cosmic dawn era. here we explore the possibility that dark matter coo... | strong constraints on light dark matter interpretation of the edges signal |
presented here is a review of present knowledge of the long-term behavior of solar activity on a multi-millennial timescale, as reconstructed using the indirect proxy method. the concept of solar activity is discussed along with an overview of the special indices used to quantify different aspects of variable solar act... | a history of solar activity over millennia |
stellar evolution theory predicts a "gap" in the black hole birth function caused by the pair instability. many presupernova stars that have a core mass below some limiting value, mlow, after all pulsational activity is finished, collapse to black holes, while more massive ones, up to some limiting value, mhigh, explod... | the pair-instability mass gap for black holes |
aims: we study the evolution of the rotation and the high energy x-ray, extreme ultraviolet (euv), and ly-α emission for f, g, k, and m dwarfs, with masses between 0.1 and 1.2 m⊙, and provide a freely available set of evolutionary tracks for use in planetary atmosphere studies.methods: we develop a physical rotational ... | the active lives of stars: a complete description of the rotation and xuv evolution of f, g, k, and m dwarfs |
we measure the velocity dispersion, σ, and surface density, σ, of the molecular gas in nearby galaxies from co spectral line cubes with spatial resolution 45-120 pc, matched to the size of individual giant molecular clouds. combining 11 galaxies from the phangs-alma survey with four targets from the literature, we char... | cloud-scale molecular gas properties in 15 nearby galaxies |
primordial black holes (pbhs) could provide the dark matter in various mass windows below 102 m⊙ and those of 30 m⊙ might explain the ligo events. pbhs much larger than this might have important consequences even if they provide only a small fraction of the dark matter. in particular, they could generate cosmological s... | primordial black holes as generators of cosmic structures |
we report evidence from apogee for the presence of a new metal-poor stellar structure located within ∼4 kpc of the galactic centre. characterized by a chemical composition resembling those of low-mass satellites of the milky way, this new inner galaxy structure (igs) seems to be chemically and dynamically detached from... | evidence from apogee for the presence of a major building block of the halo buried in the inner galaxy |
the use of type ia supernovae (sne ia) as cosmological tools has motivated significant effort to understand what drives the intrinsic scatter of sn ia distance modulus residuals after standardization, characterize the distribution of sn ia colors, and explain why properties of the host galaxies of the sne correlate wit... | it's dust: solving the mysteries of the intrinsic scatter and host-galaxy dependence of standardized type ia supernova brightnesses |
spectroscopic surveys of the milky way's stars have revealed spatial, chemical, and kinematical structures that encode its history. in this work, we study their origins using a cosmological zoom simulation, vintergatan, of a milky way-mass disc galaxy. we find that in connection to the last major merger at z ∼ 1.5, cos... | vintergatan - i. the origins of chemically, kinematically, and structurally distinct discs in a simulated milky way-mass galaxy |
the supernova impostor sn 2010da located in the nearby galaxy ngc 300, later identified as a likely supergiant b[e] high-mass x-ray binary, was simultaneously observed by nustar and xmm-newton between 2016 december 16 and 20, over a total time span of ∼310 ks. we report the discovery of a strong periodic modulation in ... | discovery of pulsations from ngc 300 ulx1 and its fast period evolution |
the transiting exoplanet survey satellite (tess) is finding transiting planet candidates around bright, nearby stars across the entire sky. the large field of view, however, results in low spatial resolution; therefore, multiple stars contribute to almost every tess light curve. high angular resolution imaging can dete... | soar tess survey. i. sculpting of tess planetary systems by stellar companions |
we present an improved measurement of the hubble constant (h0) using the `inverse distance ladder' method, which adds the information from 207 type ia supernovae (sne ia) from the dark energy survey (des) at redshift 0.018 < z < 0.85 to existing distance measurements of 122 low-redshift (z < 0.07) sne ia (low-... | first cosmological results using type ia supernovae from the dark energy survey: measurement of the hubble constant |
the aavso photometric all sky survey (apass) project is designed to bridge the gap between the shallow tycho2 two-bandpass photometric catalog that is complete to v=11 and the deeper, but less spatially-complete catalogs like sdss or panstarrs. it can be used for calibration of a specific field; for obtaining spectral ... | vizier online data catalog: aavso photometric all sky survey (apass) dr9 (henden+, 2016) |
advanced ligo detectors at hanford and livingston made two confirmed and one marginal detection of binary black holes during their first observing run. the first event, gw150914, was from the merger of two black holes much heavier that those whose masses have been estimated so far, indicating a formation scenario that ... | are merging black holes born from stellar collapse or previous mergers? |
giant planets acquire gas, ices and rocks during the early formation stages of planetary systems and thus inform us on the formation process itself. proceeding from inside out, examining the connections between the deep interiors and the observable atmospheres, linking detailed measurements on giant planets in the sola... | giant planets from the inside-out |
star formation histories (sfh) of early (6$<z<$12) galaxies have been found to be highly stochastic in both simulations and observations, while at $z\lesssim$6 the presence of a main sequence (ms) of star-forming galaxies imply secular processes at play. in this work, we aim at characterising the sfh variability ... | identification of a transition from stochastic to secular star formation around $z=9$ with jwst |
we propose the existence of a lower bound on the energy of pure neutron matter (pnm) on the basis of unitary-gas considerations. we discuss its justification from experimental studies of cold atoms as well as from theoretical studies of neutron matter. we demonstrate that this bound results in limits to the density-dep... | symmetry parameter constraints from a lower bound on neutron-matter energy |
solar eruptions are spectacular magnetic explosions in the sun's corona, and how they are initiated remains unclear. prevailing theories often rely on special magnetic topologies that may not generally exist in the pre-eruption source region of corona. here, using fully three-dimensional magnetohydrodynamic simulations... | a fundamental mechanism of solar eruption initiation |
the first generation of stars, often called population iii (or pop iii), form from metal-free primordial gas at redshifts z ∼ 30 and below. they dominate the cosmic star-formation history until z ∼ 15-20, at which point the formation of metal-enriched population ii stars takes over. we review current theoretical models... | the first stars: formation, properties, and impact |
with just a month of data, jwst is already transforming our view of the universe, revealing and resolving starlight in unprecedented populations of galaxies. although "hst-dark" galaxies have previously been detected at long wavelengths, these observations generally suffer from a lack of spatial resolution, which limit... | jwst reveals a population of ultrared, flattened galaxies at 2 ≲ z ≲ 6 previously missed by hst |
in recent years, machine learning has emerged as a powerful computational tool and novel problem-solving perspective for physics, offering new avenues for studying strongly interacting qcd matter properties under extreme conditions. this review article aims to provide an overview of the current state of this intersecti... | exploring qcd matter in extreme conditions with machine learning |
we present results on the morphological and structural evolution of a total of 3956 galaxies observed with jwst at 1.5 < z < 6.5 in the jwst ceers observations that overlap with the candels egs field. this is the biggest visually classified sample observed with jwst yet, ~20 times larger than previous studies, an... | the jwst hubble sequence: the rest-frame optical evolution of galaxy structure at 1.5 < z < 6.5 |
astrophysical processes such as feedback from supernovae and active galactic nuclei modify the properties and spatial distribution of dark matter, gas, and galaxies in a poorly understood way. this uncertainty is one of the main theoretical obstacles to extract information from cosmological surveys. we use 2,000 state-... | multifield cosmology with artificial intelligence |
we investigate the neutron star (ns) equation of state (eos) by incorporating multi-messenger data of gw170817, psr j0030+0451, psr j0740+6620, and state-of-the-art theoretical progresses, including the information from chiral effective field theory ($\chi$eft) and perturbative quantum chromodynamics (pqcd) calculation... | plausible presence of new state in neutron stars with masses above 0.98mtov |
stellar evolution theory predicts multiple pathways to the explosive deaths of stars as supernovae. locating and characterizing the progenitors of well-studied supernovae is important to constrain the theory and to justify and design future surveys to improve on progenitor detections. here we report the serendipitous p... | possible detection of the progenitor of the type ii supernova sn 2023ixf |
we present the identification of 42 narrow-line active galactic nuclei (type-2 agn) candidates in the two deepest observations of the jades spectroscopic survey with jwst/nirspec. the spectral coverage and the depth of our observations allow us to select narrow-line agns based on both rest-frame optical and uv emission... | jades: a large population of obscured, narrow line agn at high redshift |
we report the discovery of a remarkable lyα emitting galaxy at z = 7.2782, jades-gs+53.16746−27.7720 (shortened to jades-gs-z7-la), with rest-frame equivalent width, ew0(lyα) = 388.0 ± 88.8 å and uv magnitude −17.0. the spectroscopic redshift is confirmed via rest-frame optical lines [o ii], hβ and [o iii] in its jwst/... | jades: discovery of extremely high equivalent width lyman-α emission from a faint galaxy within an ionized bubble at z = 7.3 |
we present a spatially resolved study of stellar populations in 6 galaxies with stellar masses $m_*\sim10^{10}m_\odot$ at $z\sim3.7$ using 14-filter jwst/nircam imaging from the jades and jems surveys. the 6 galaxies are visually selected to have clumpy substructures with distinct colors over rest-frame $3600-4100$å, i... | jades + jems: a detailed look at the buildup of central stellar cores and suppression of star formation in galaxies at redshifts 3 < z < 4.5 |
we investigate close encounters by stellar mass black holes (bhs) in the gaseous discs of active galactic nuclei (agn) as a potential formation channel of binary black holes (bbhs). we perform a series of 2d isothermal viscous hydrodynamical simulations within a shearing box prescription using the eulerian grid code \t... | gas assisted binary black hole formation in agn discs |
we present nustar observations of the nearby sn 2023ixf in m101 (d = 6.9 mpc) that provide the earliest hard x-ray detection of a nonrelativistic stellar explosion to date at δ t ≈ 4 days and δ t ≈ 11 days. the spectra are well described by a hot thermal bremsstrahlung continuum with t > 25 kev shining through a thi... | early hard x-rays from the nearby core-collapse supernova sn 2023ixf |
we present the mufasa suite of cosmological hydrodynamic simulations, which employs the gizmo meshless finite mass (mfm) code including h2-based star formation, nine-element chemical evolution, two-phase kinetic outflows following scalings from the feedback in realistic environments zoom simulations, and evolving halo ... | mufasa: galaxy formation simulations with meshless hydrodynamics |
the first neutron star (ns) merger observed by advanced ligo and virgo, gw170817, and its fireworks of electromagnetic counterparts across the entire electromagnetic spectrum marked the beginning of multi-messenger astronomy and astrophysics with gravitational waves. the ultraviolet, optical, and near-infrared emission... | gw170817 -the first observed neutron star merger and its kilonova: implications for the astrophysical site of the r-process |
we present the first generalization of navier-stokes theory to relativity that satisfies all of the following properties: (a) the system coupled to einstein's equations is causal and strongly hyperbolic; (b) equilibrium states are stable; (c) all leading dissipative contributions are present, i.e., shear viscosity, bul... | first-order general-relativistic viscous fluid dynamics |
we analytically solve the problem of bose star growth in the bath of gravitationally interacting particles. we find that after nucleation of this object the bath is described by a self-similar solution of kinetic equation. together with the conservation laws, this fixes mass evolution of the bose star. our theory expla... | self-similar growth of bose stars |
we present the properties of milky way- and andromeda-like (mw/m31-like) galaxies simulated within tng50, the highest-resolution run of the illustristng suite of $\lambda$cdm magneto-hydrodynamical simulations. we introduce our fiducial selection for mw/m31 analogs, which we propose for direct usage as well as for refe... | milky way and andromeda analogs from the tng50 simulation |
recent discoveries of a significant population of bright galaxies at cosmic dawn $\left(z\gtrsim 10\right)$ have enabled critical tests of cosmological galaxy formation models. in particular, the bright end of the galaxys' uv luminosity functions (uvlfs) appear higher than predicted by many models. using approximately ... | bursty star formation naturally explains the abundance of bright galaxies at cosmic dawn |
in this article, we explore some emerging properties of the stellar objects in the frame of the $f(r,t)$ gravity by employing the well-known karmarkar condition, where $r$ and $t$ represent ricci scalar and trace of energy momentum tensor respectively. it is worthy to highlight here that we assume the exponential type ... | study of embedded class-i fluid spheres in f(r,t) gravity with karmarkar condition |
the search for habitable environments and biomarkers in exoplanetary atmospheres is the holy grail of exoplanet science. the detection of atmospheric signatures of habitable earth-like exoplanets is challenging owing to their small planet-star size contrast and thin atmospheres with high mean molecular weight. recently... | carbon-bearing molecules in a possible hycean atmosphere |
exoplanet discoveries of recent years have provided a great deal of new data for studying the bulk compositions of giant planets. here we identify 47 transiting giant planets (20 m ⊕ < m < 20 m j) whose stellar insolations are low enough (f * < 2 × 108 erg s-1 cm-2, or roughly t eff < 1000) that they are no... | the mass-metallicity relation for giant planets |
in this paper, we present the galex-sdss-wise legacy catalog (gswlc), a catalog of physical properties (stellar masses, dust attenuations, and star formation rates [sfrs]) for ∼700,000 galaxies with sloan digital sky survey (sdss) redshifts below 0.3. gswlc contains galaxies within the galaxy evolution explorer footpri... | galex-sdss-wise legacy catalog (gswlc): star formation rates, stellar masses, and dust attenuations of 700,000 low-redshift galaxies |
the evolution of helium stars with initial masses in the range 1.6-120 {m}⊙is studied, including the effects of mass loss by winds. these stars are assumed to form in binary systems when their expanding hydrogenic envelopes are promptly lost just after helium ignition. significant differences are found with single-star... | the evolution of massive helium stars, including mass loss |
we introduce project nihao (numerical investigation of a hundred astrophysical objects), a set of 100 cosmological zoom-in hydrodynamical simulations performed using the gasoline code, with an improved implementation of the sph algorithm. the haloes in our study range from dwarf (m200 ∼ 5 × 109 m⊙) to milky way (m200 ∼... | nihao project - i. reproducing the inefficiency of galaxy formation across cosmic time with a large sample of cosmological hydrodynamical simulations |
context. open clusters are key targets for studies of galaxy structure and evolution, and stellar physics. since the gaia data release 2 (dr2), the discovery of undetected clusters has shown that previous surveys were incomplete.aims: our aim is to exploit the big data capabilities of machine learning to detect new ope... | hunting for open clusters in gaia dr2: 582 new open clusters in the galactic disc |
the first four gravitational wave events detected by ligo were all interpreted as merging black hole binaries (bhbs), opening a new perspective on the study of such systems. here we use our new population-synthesis code mobse, an upgraded version of bse, to investigate the demography of merging bhbs. mobse includes met... | merging black hole binaries: the effects of progenitor's metallicity, mass-loss rate and eddington factor |
the search for life in the universe is a fundamental problem of astrobiology and modern science. the current progress in the detection of terrestrial-type exoplanets has opened a new avenue in the characterization of exoplanetary atmospheres and in the search for biosignatures of life with the upcoming ground-based and... | impact of space weather on climate and habitability of terrestrial-type exoplanets |
annular structures (rings and gaps) in disks around pre-main-sequence stars have been detected in abundance towards class ii protostellar objects that are approximately 1,000,000 years old1. these structures are often interpreted as evidence of planet formation1-3, with planetary-mass bodies carving rings and gaps in t... | four annular structures in a protostellar disk less than 500,000 years old |
during 2014 and 2015, nasa's neutron star interior composition explorer (nicer) mission proceeded success- fully through phase c, design and development. an x-ray (0.2-12 kev) astrophysics payload destined for the international space station, nicer is manifested for launch in early 2017 on the commercial resupply servi... | the neutron star interior composition explorer (nicer): design and development |
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