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we present a combined analysis of rest-frame far-uv (fuv; 1000-2000 å) and rest-frame optical (3600-7000 å) composite spectra formed from very deep keck/lris and keck/mosfire observations of a sample of 30 star-forming galaxies with z=2.40+/- 0.11, selected to be broadly representative of the full kbss-mosfire spectros... | reconciling the stellar and nebular spectra of high-redshift galaxies |
ultrahot giant exoplanets receive thousands of times earth's insolation1,2. their high-temperature atmospheres (greater than 2,000 kelvin) are ideal laboratories for studying extreme planetary climates and chemistry3-5. daysides are predicted to be cloud-free, dominated by atomic species6 and much hotter than nightside... | nightside condensation of iron in an ultrahot giant exoplanet |
pds 70 is a unique system in which two protoplanets, pds 70 b and c, have been discovered within the dust-depleted cavity of their disk, at ~22 and 34 au, respectively, by direct imaging at infrared wavelengths. subsequent detection of the planets in the hα line indicates that they are still accreting material through ... | a circumplanetary disk around pds70c |
we present new alma observations and physical properties of a lyman break galaxy at z = 7.15. our target, b14-65666, has a bright ultra-violet (uv) absolute magnitude, muv ≈ -22.4, and has been spectroscopically identified in lyα with a small rest-frame equivalent width of ≈4 å. a previous hubble space telescope (hst) ... | big three dragons: a z = 7.15 lyman-break galaxy detected in [o iii] 88 μm, [c ii] 158 μm, and dust continuum with alma |
extreme climatic events have recently impacted marine ecosystems around the world, including foundation species such as corals and kelps. here, we describe the rapid climate-driven catastrophic shift in 2014 from a previously robust kelp forest to unproductive large scale urchin barrens in northern california. bull kel... | marine heat wave and multiple stressors tip bull kelp forest to sea urchin barrens |
we present the extended galex arecibo sdss survey (xgass), a gas fraction-limited census of the atomic hydrogen (h i) gas content of 1179 galaxies selected only by stellar mass (m⋆ = 109-1011.5 m⊙) and redshift (0.01 < z < 0.05). this includes new arecibo observations of 208 galaxies, for which we release catalog... | xgass: total cold gas scaling relations and molecular-to-atomic gas ratios of galaxies in the local universe |
we use sedz* -- a code designed to chart star formation histories (sfhs) of 6<z<12 galaxies -- to analyze the seds of 894 galaxies with deep jwst/nircam imaging by jades in the goods-s field. we show how sedz* matches observed seds using stellar-population templates, graphing the contribution of each epoch-by-epo... | building the first galaxies -- chapter 2. starbursts dominate the star formation histories of 6 < z <12 galaxies |
context. after years of scientific progress, the origin of stellar binary black holes is still a great mystery. several formation channels for merging black holes have been proposed in the literature. as more merger detections are expected with future gravitational-wave observations, population synthesis studies can he... | the origin of spin in binary black holes. predicting the distributions of the main observables of advanced ligo |
we describe the sample design for the sdss-iv manga survey and present the final properties of the main samples along with important considerations for using these samples for science. our target selection criteria were developed while simultaneously optimizing the size distribution of the manga integral field units (i... | the sdss-iv manga sample: design, optimization, and usage considerations |
we analyze pre-explosion near- and mid-infrared (ir) imaging of the site of sn 2023ixf in the nearby spiral galaxy m101 and characterize the candidate progenitor star. the star displays compelling evidence of variability with a possible period of ≈1000 days and an amplitude of δm ≈ 0.6 mag in extensive monitoring with ... | a luminous red supergiant and dusty long-period variable progenitor for sn 2023ixf |
in this white paper, we present an experimental road map for spectroscopic experiments beyond desi. desi will be a transformative cosmological survey in the 2020s, mapping 40 million galaxies and quasars and capturing a significant fraction of the available linear modes up to z=1.2. desi-ii will pilot observations of g... | a spectroscopic road map for cosmic frontier: desi, desi-ii, stage-5 |
we present astrophysical false positive probability calculations for every kepler object of interest (koi)—the first large-scale demonstration of a fully automated transiting planet validation procedure. out of 7056 kois, we determine that 1935 have probabilities <1% of being astrophysical false positives, and thus ... | false positive probabilities for all kepler objects of interest: 1284 newly validated planets and 428 likely false positives |
we have conducted a survey of 328 protostars in the orion molecular clouds with the atacama large millimeter/submillimeter array at 0.87 mm at a resolution of ∼0"1 (40 au), including observations with the very large array at 9 mm toward 148 protostars at a resolution of ∼0"08 (32 au). this is the largest multiwavelengt... | the vla/alma nascent disk and multiplicity (vandam) survey of orion protostars. ii. a statistical characterization of class 0 and class i protostellar disks |
we report discovery of a bright, nearby ($g = 13.8;\, \, d = 480\, \rm pc$) sun-like star orbiting a dark object. we identified the system as a black hole candidate via its astrometric orbital solution from the gaia mission. radial velocities validated and refined the gaia solution, and spectroscopy ruled out significa... | a sun-like star orbiting a black hole |
we calculate the potential contributions of the motion of binary mass systems in gravity to the fifth post-newtonian order ab initio using coupling and velocity expansions within an effective field theory approach based on feynman amplitudes starting with harmonic coordinates and using dimensional regularization. furth... | the fifth-order post-newtonian hamiltonian dynamics of two-body systems from an effective field theory approach: potential contributions |
the mass-luminosity relation for late-type stars has long been a critical tool for estimating stellar masses. however, there is growing need for both a higher-precision relation and a better understanding of systematic effects (e.g., metallicity). here we present an empirical relationship between {m}{ks} and m * spanni... | how to constrain your m dwarf. ii. the mass-luminosity-metallicity relation from 0.075 to 0.70 solar masses |
we report the discovery of the unusually bright long-duration gamma-ray burst (grb), grb 221009a, as observed by the neil gehrels swift observatory (swift), monitor of all-sky x-ray image, and neutron star interior composition explorer mission. this energetic grb was located relatively nearby (z = 0.151), allowing for ... | grb 221009a: discovery of an exceptionally rare nearby and energetic gamma-ray burst |
the atacama large millimetre/submillimetre array (alma) is currently in the process of transforming our view of star-forming galaxies in the distant (z ≳1 ) universe. before alma, most of what we knew about dust-obscured star formation in distant galaxies was limited to the brightest submillimetre sources—the so-called... | high-redshift star formation in the atacama large millimetre/submillimetre array era |
the transiting exoplanet survey satellite (tess) is a nasa-sponsored explorer mission that will perform a wide-field survey for planets that transit bright host stars. here, we predict the properties of the transiting planets that tess will detect along with the eb stars that produce false-positive photometric signals.... | the transiting exoplanet survey satellite: simulations of planet detections and astrophysical false positives |
av3sb5 (a = k, rb, cs) is a novel kagome superconductor coexisting with the charge density wave (cdw) order. identifying the structure of the cdw order is crucial for understanding the exotic normal state and superconductivity in this system. here, we report 51v nuclear magnetic resonance (nmr) and 121/123sb nuclear qu... | possible star-of-david pattern charge density wave with additional modulation in the kagome superconductor csv3sb5 |
coalescence of neutron stars (nss) gives rise to kilonova, thermal emission powered by radioactive decays of freshly synthesized r-process nuclei. although observational properties are largely affected by bound-bound opacities of r-process elements, available atomic data have been limited. in this paper, we study eleme... | systematic opacity calculations for kilonovae |
we report the first detections of the repeating fast radio burst source frb 121102 above 5.2 ghz. observations were performed using the 4-8 ghz receiver of the robert c. byrd green bank telescope with the breakthrough listen digital backend. we present the spectral, temporal, and polarization properties of 21 bursts de... | highest frequency detection of frb 121102 at 4-8 ghz using the breakthrough listen digital backend at the green bank telescope |
due to its ubiquitous presence, turbulence is often invoked to explain the origin of nonthermal particles in astrophysical sources of high-energy emission. with particle-in-cell simulations, we study decaying turbulence in magnetically dominated (or, equivalently, "relativistic") pair plasmas. we find that the generati... | particle acceleration in relativistic plasma turbulence |
we present the results of the first, deep atacama large millimeter array (alma) imaging covering the full ≃4.5 arcmin2 of the hubble ultra deep field (hudf) imaged with wide field camera 3/ir on hst. using a 45-pointing mosaic, we have obtained a homogeneous 1.3-mm image reaching σ1.3 ≃ 35 μjy, at a resolution of ≃0.7 ... | a deep alma image of the hubble ultra deep field |
the sdss-iii/apache point observatory galactic evolution experiment (apogee) survey operated from 2011-2014 using the apogee spectrograph, which collects high-resolution (r ∼ 22,500), near-ir (1.51-1.70 μm) spectra with a multiplexing (300 fiber-fed objects) capability. we describe the survey data products that are pub... | abundances, stellar parameters, and spectra from the sdss-iii/apogee survey |
fast radio bursts (frbs) are a powerful and mysterious new class of transient that are luminous enough to be detected at cosmological distances. by associating frbs to host galaxies, we can measure intrinsic and environmental properties that test frb origin models, in addition to using them as precise probes of distant... | deep synoptic array science: first frb and host galaxy catalog |
in this study, we explore several new characteristics of a static anisotropic hybrid star with strange quark matter (sqm) and ordinary baryonic matter (obm) distribution. here, we use the mit bag model equation of state to connect the density and pressure of sqm inside stars, whereas the linear equation of state pr=α ρ... | physical characteristics and maximum allowable mass of hybrid star in the context of f(q) gravity |
our understanding of the planet formation has been rapidly evolving in recent years. the classical planet formation theory, developed when the only known planetary system was our own solar system, has been revised to account for the observed diversity of the exoplanetary systems. at the same time, the increasing observ... | planet formation theory in the era of alma and kepler: from pebbles to exoplanets |
advanced ligo may be the first experiment to detect gravitational waves. through superradiance of stellar black holes, it may also be the first experiment to discover the qcd axion with decay constant above the grand unification scale. when an axion's compton wavelength is comparable to the size of a black hole, the ax... | discovering the qcd axion with black holes and gravitational waves |
one of the key open questions in extragalactic astronomy is what stops star formation in galaxies. while it is clear that the cold gas reservoir, which fuels the formation of new stars, must be affected first, how this happens and what are the dominant physical mechanisms involved is still a matter of debate. at least ... | the dawes review 9: the role of cold gas stripping on the star formation quenching of satellite galaxies |
in this paper we present a new scenario where massive primordial black holes (pbhs) are produced from the collapse of large curvature perturbations generated during a mild-waterfall phase of hybrid inflation. we determine the values of the inflaton potential parameters leading to a pbh mass spectrum peaking on planetar... | massive primordial black holes from hybrid inflation as dark matter and the seeds of galaxies |
the relationships between stellar mass, gas-phase metallicity and star-formation rate (i.e. the mass-metallicity, mzr, and the fundamental metallicity relation, fmr) in the local universe are revisited by fully anchoring the metallicity determination for sdss galaxies on the te abundance scale defined exploiting the st... | the mass-metallicity and the fundamental metallicity relation revisited on a fully te-based abundance scale for galaxies |
the confirmation of the presence of very massive quiescent galaxies at epochs only 1-2 gyr after the big bang has challenged models of cosmology and galaxy formation. producing sufficient numbers of these requires abundant numbers of the host dark matter halos to have been assembled and sufficient time for star formati... | a population of faint, old, and massive quiescent galaxies at 3 < z < 4 revealed by jwst nirspec spectroscopy |
we present hubble space telescope (hst) photometry of 17 cepheids in open clusters and their cluster mean parallaxes from gaia edr3. these parallaxes are more precise than those from individual cepheids (g < 8 mag) previously used to measure the hubble constant because they are derived from an average of >300 sta... | cluster cepheids with high precision gaia parallaxes, low zero-point uncertainties, and hubble space telescope photometry |
we measure a value for the cosmic expansion of h(z) = 89 ± 23(stat) ± 44(syst) km s-1 mpc-1 at a redshift of z ≃ 0.47 based on the differential age technique. this technique, also known as cosmic chronometers, uses the age difference between two redshifts for a passively evolving population of galaxies to calculate the... | age-dating luminous red galaxies observed with the southern african large telescope |
x-ray pulse profile modeling of psr j 0740 +6620 , the most massive known pulsar, with data from the nicer and xmm-newton observatories recently led to a measurement of its radius. we investigate this measurement's implications for the neutron star equation of state (eos), employing a nonparametric eos model based on g... | impact of the psr j 0740 +6620 radius constraint on the properties of high-density matter |
"exoplanet" is a toolkit for probabilistic modeling of astronomical time series data, with a focus on observations of exoplanets, using pymc3 (salvatier et al., 2016). pymc3 is a flexible and high-performance model-building language and inference engine that scales well to problems with a large number of parameters. "e... | exoplanet: gradient-based probabilistic inference for exoplanet data & other astronomical time series |
we present very large array (vla) and atacama large millimeter/submillimeter array (alma) radio observations of gw170817, the first laser interferometer gravitational-wave observatory (ligo)/virgo gravitational wave (gw) event from a binary neutron star merger and the first gw event with an electromagnetic (em) counter... | the electromagnetic counterpart of the binary neutron star merger ligo/virgo gw170817. vi. radio constraints on a relativistic jet and predictions for late-time emission from the kilonova ejecta |
we report jwst/nirspec spectra of three distant t-type brown dwarfs identified in the ultradeep nirspec and nircam observations before the epoch of reionization (uncover) survey of the abell 2744 lensing field. one source was previously reported as a candidate t dwarf on the basis of nircam photometry, while two source... | uncover: jwst spectroscopy of three cold brown dwarfs at kiloparsec-scale distances |
subarcsecond localization of the repeating fast radio burst frb 121102 revealed its coincidence with a dwarf host galaxy and a steady (“quiescent”) nonthermal radio source. we show that the properties of the host galaxy are consistent with those of long-duration gamma-ray bursts (lgrb) and hydrogen-poor superluminous s... | millisecond magnetar birth connects frb 121102 to superluminous supernovae and long-duration gamma-ray bursts |
we present a comprehensive search and analysis of high-redshift galaxies in a suite of nine public jwst extragalactic fields taken in cycle 1, covering a total effective search area of $\sim358{\rm arcmin^2}$. through conservative ($8\sigma$) photometric selection, we identify 341 galaxies at $5<z<14$, with 109 h... | enhanced sub-kpc scale star-formation: results from a jwst size analysis of 341 galaxies at 5<z<14 |
we use the spectro-photometric information of ~219 million stars from gaia's dr3 to calculate synthetic, narrow-band, metallicity-sensitive cahk magnitudes that mimic the observations of the pristine survey, a survey of photometric metallicities of milky way stars that has been mapping more than 6,500 deg^2 of the nort... | the pristine survey -- xxiii. data release 1 and an all-sky metallicity catalogue based on gaia dr3 bp/rp spectro-photometry |
a review is made of constraints on the nuclear symmetry energy parameters arising from nuclear binding energy measurements, theoretical chiral effective field predictions of neutron matter properties, the unitary gas conjecture, and measurements of neutron skin thicknesses and dipole polarizabilities. while most studie... | constraints on nuclear symmetry energy parameters |
a previous paper~\cite{bern:2022kto} identified a puzzle stemming from the amplitudes-based approach to spinning bodies in general relativity: additional wilson coefficients appear compared to current worldline approaches to conservative dynamics of generic astrophysical objects, including neutron stars. in this paper ... | quantum field theory, worldline theory, and spin magnitude change in orbital evolution |
the asteroid terrestrial impact last alert system (atlas) system consists of two 0.5 m schmidt telescopes with cameras covering 29 square degrees at plate scale of 1.86 arcsec per pixel. working in tandem, the telescopes routinely survey the whole sky visible from hawaii (above $\delta \gt -50^\circ $ ) every two night... | design and operation of the atlas transient science server |
the mergers of binaries containing neutron stars and stellar-mass black holes are among the most promising sources for direct detection in gravitational waves by the interferometers advanced ligo and virgo over the next few years. the concurrent detection of electromagnetic emission from these events would greatly enha... | electromagnetic signatures of neutron star mergers in the advanced ligo era |
we present hubble wfc3/ir slitless grism spectra of a remarkably bright z ≳ 10 galaxy candidate, gn-z11, identified initially from candels/goods-n imaging data. a significant spectroscopic continuum break is detected at λ =1.47+/- 0.01 μ {{m}}. the new grism data, combined with the photometric data, rule out all plausi... | a remarkably luminous galaxy at z=11.1 measured with hubble space telescope grism spectroscopy |
massive primordial black holes (mpbh) can be formed after inflation due to broad peaks in the primordial curvature power spectrum that collapse gravitationally during the radiation era, to form clusters of black holes that merge and increase in mass after recombination, generating today a broad mass-spectrum of black h... | massive primordial black holes as dark matter and their detection with gravitational waves |
the transiting exoplanet survey satellite (tess) has a goal of detecting small planets orbiting stars bright enough for mass determination via ground-based radial velocity observations. here, we present estimates of how many exoplanets the tess mission will detect, the physical properties of the detected planets, and t... | a revised exoplanet yield from the transiting exoplanet survey satellite (tess) |
in this work we review the role of hyperons on the properties of neutron and proto-neutron stars. in particular, we revise the so-called "hyperon puzzle", go over some of the solutions proposed to tackle it, and discuss the implications that the recent measurements of unusually high neutron star masses have on our pres... | do hyperons exist in the interior of neutron stars? |
tidal effects have an important impact on the late inspiral of compact binary systems containing neutron stars. most current models of tidal deformations of neutron stars assume that the tidal bulge is directly related to the tidal field generated by the companion, with a constant response coefficient. however, if the ... | dynamical tides in general relativity: effective action and effective-one-body hamiltonian |
the formation of our milky way can be split up qualitatively into different phases that resulted in its structurally different stellar populations: the halo and the disk components1-3. revealing a quantitative overall picture of our galaxy's assembly requires a large sample of stars with very precise ages. here we repo... | a time-resolved picture of our milky way's early formation history |
the complex nature of the nuclear forces generates a broad range and diversity of observational phenomena. heavy nuclei, though orders of magnitude less massive than neutron stars, are governed by the same underlying physics, which is enshrined in the nuclear equation of state. heavy nuclei are expected to develop a ne... | neutron skins of atomic nuclei: per aspera ad astra |
we present the stage ii results from the ongoing satellites around galactic analogs (saga) survey. upon completion, the saga survey will spectroscopically identify satellite galaxies brighter than mr,o = -12.3 around 100 milky way (mw) analogs at z ∼ 0.01. in stage ii, we have more than quadrupled the sample size of st... | the saga survey. ii. building a statistical sample of satellite systems around milky way-like galaxies |
pulsar timing array (pta) collaborations in north america, australia, and europe, have been exploiting the exquisite timing precision of millisecond pulsars over decades of observations to search for correlated timing deviations induced by gravitational waves (gws). ptas are sensitive to the frequency band ranging just... | the astrophysics of nanohertz gravitational waves |
we present version 8 of the chianti database. this version includes a large amount of new data and ions, which represent a significant improvement in the soft x-ray, extreme uv (euv) and uv spectral regions, which several space missions currently cover. new data for neutrals and low charge states are also added. the da... | chianti - an atomic database for emission lines. version 8 |
the saturn-mass exoplanet wasp-39b has been the subject of extensive efforts to determine its atmospheric properties using transmission spectroscopy1-4. however, these efforts have been hampered by modelling degeneracies between composition and cloud properties that are caused by limited data quality5-9. here we presen... | early release science of the exoplanet wasp-39b with jwst niriss |
context. a new class of exoplanets has emerged: the ultra hot jupiters, the hottest close-in gas giants. the majority of them have weaker-than-expected spectral features in the 1.1-1.7 μm bandpass probed by hst/wfc3 but stronger spectral features at longer wavelengths probed by spitzer. this led previous authors to puz... | from thermal dissociation to condensation in the atmospheres of ultra hot jupiters: wasp-121b in context |
recent detection of gravitational waves from a neutron star (ns) merger event gw170817 and identification of an electromagnetic counterpart provide a unique opportunity to study the physical processes in ns mergers. to derive properties of ejected material from the ns merger, we perform radiative transfer simulations o... | kilonova from post-merger ejecta as an optical and near-infrared counterpart of gw170817 |
we present empirical measurements of the radii of 116 stars that host transiting planets. these radii are determined using only direct observables—the bolometric flux at earth, the effective temperature, and the parallax provided by the gaia first data release—and thus are virtually model independent, with extinction b... | accurate empirical radii and masses of planets and their host stars with gaia parallaxes |
context. the kilo-degree survey (kids) is an ongoing optical wide-field imaging survey with the omegacam camera at the vlt survey telescope, specifically designed for measuring weak gravitational lensing by galaxies and large-scale structure. when completed it will consist of 1350 square degrees imaged in four filters ... | the fourth data release of the kilo-degree survey: ugri imaging and nine-band optical-ir photometry over 1000 square degrees |
the maximal gravitational mass of nonrotating neutron stars ($m_{\rm tov}$) is one of the key parameters of compact objects and only loose bounds can be set based on the first principle. with reliable measurements of the masses and/or radii of the neutron stars, $m_{\rm tov}$ can be robustly inferred from either the ma... | maximum gravitational mass $m_{\\rm tov}=2.25^{+0.08}_{-0.07}m_\\odot$ inferred at about $3\\%$ precision with multimessenger data of neutron stars |
searching for distinctive signatures, which characterize different formation channels of binary black holes (bbhs), is a crucial step towards the interpretation of current and future gravitational wave detections. here, we investigate the demography of merging bbhs in young star clusters (scs), which are the nursery of... | merging black holes in young star clusters |
star and planet formation are the complex outcomes of gravitational collapse and angular momentum transport mediated by protostellar and protoplanetary disks. in this review, we focus on the role of gravitational instability in this process. we begin with a brief overview of the observational evidence for massive disks... | gravitational instabilities in circumstellar disks |
recent population studies have searched for a subpopulation of primordial black holes (pbhs) in the gravitational-wave (gw) events so far detected by ligo/virgo/kagra (lvk), in most cases adopting a phenomenological pbh mass distribution. when deriving such a population from first principles in the standard scenario, h... | from inflation to black hole mergers and back again: gravitational-wave data-driven constraints on inflationary scenarios with a first-principle model of primordial black holes across the qcd epoch |
we experimentally study the response of star-shaped clusters of initially unentangled n =4 , 10, and 37 nuclear spin-1 /2 moments to an inexact π -pulse sequence and show that an ising coupling between the center and the satellite spins results in robust period-2 magnetization oscillations. the period is stable against... | temporal order in periodically driven spins in star-shaped clusters |
we study the link between baryons and dark matter (dm) in 240 galaxies with spatially resolved kinematic data. our sample spans 9 dex in stellar mass and includes all morphological types. we consider (1) 153 late-type galaxies (ltgs; spirals and irregulars) with gas rotation curves from the sparc database, (2) 25 early... | one law to rule them all: the radial acceleration relation of galaxies |
gravitational-wave detections are starting to allow us to probe the physical processes in the evolution of very massive stars through the imprints they leave on their final remnants. stellar evolution theory predicts the existence of a gap in the black hole mass distribution at high mass due to the effects of pair inst... | constraints from gravitational-wave detections of binary black hole mergers on the 12c(α, γ)16o rate |
we used high-precision radial velocity measurements of fgkm stars to determine the occurrence of giant planets as a function of orbital separation spanning 0.03-30 au. giant planets are more prevalent at orbital distances of 1-10 au compared to orbits interior or exterior of this range. the increase in planet occurrenc... | california legacy survey. ii. occurrence of giant planets beyond the ice line |
debris disks are tenuous, dust-dominated disks commonly observed around stars over a wide range of ages. those around main sequence stars are analogous to the solar system's kuiper belt and zodiacal light. the dust in debris disks is believed to be continuously regenerated, originating primarily with collisions of plan... | debris disks: structure, composition, and variability |
the rest-frame ultraviolet properties of galaxies during the first three billion years of cosmic time (redshift z > 4) indicate a rapid evolution in the dust obscuration of such galaxies. this evolution implies a change in the average properties of the interstellar medium, but the measurements are systematically unc... | galaxies at redshifts 5 to 6 with systematically low dust content and high [c ii] emission |
we investigate the stellar populations for a sample of 161 massive, mainly quiescent galaxies at <z obs> = 0.8 with deep keck/deimos rest-frame optical spectroscopy (halo7d survey). with the fully bayesian framework prospector, we simultaneously fit the spectroscopic and photometric data with an advanced physical... | fast, slow, early, late: quenching massive galaxies at z ∼ 0.8 |
we have conducted 19 state-of-the-art 3d core-collapse supernova simulations spanning a broad range of progenitor masses. this is the largest collection of sophisticated 3d supernova simulations ever performed. we have found that while the majority of these models explode, not all do, and that even models in the middle... | the overarching framework of core-collapse supernova explosions as revealed by 3d fornax simulations |
mergers of black hole-neutron star (bhns) binaries have now been observed by gravitational wave (gw) detectors with the recent announcement of gw200105 and gw200115. such observations not only provide confirmation that these systems exist but will also give unique insights into the death of massive stars, the evolution... | impact of massive binary star and cosmic evolution on gravitational wave observations i: black hole-neutron star mergers |
compact stars may contain quark matter in their interiors at densities exceeding several times the nuclear saturation density. we explore models of such compact stars where there are two first-order phase transitions: the first from nuclear matter to a quark-matter phase, followed at a higher density by another first-o... | compact stars with sequential qcd phase transitions |
over the last few years, both atacama large millimeter/submillimeter array (alma) and spitzer observations have revealed a population of likely massive galaxies at z > 3 that was too faint to be detected inhubble space telescope(hst) rest-frame ultraviolet imaging. however, due to the very limited photometry for ind... | unveiling the nature of infrared bright, optically dark galaxies with early jwst data |
we present results of a deep spectroscopic survey quantifying the statistics of the escape of ionizing radiation from star-forming galaxies at z ∼ 3. we measure the ratio of ionizing to non-ionizing uv flux density < {f}900{/f}1500{> }obs}, where f 900 is the mean flux density evaluated over the range [880, 910] ... | the keck lyman continuum spectroscopic survey (klcs): the emergent ionizing spectrum of galaxies at z ∼ 3 |
planets form and obtain their compositions in disks of gas and dust around young stars. the chemical compositions of these planet-forming disks regulate all aspects of planetary compositions from bulk elemental inventories to access to water and reactive organics, i.e. a planet's hospitality to life and its chemical or... | astrochemistry and compositions of planetary systems |
neutrino flavor evolution in core-collapse supernovae, neutron-star mergers, or the early universe is dominated by neutrino-neutrino refraction, often spawning ;self-induced flavor conversion,; i.e., shuffling of flavor among momentum modes. this effect is driven by collective run-away modes of the coupled ;flavor osci... | collective neutrino flavor conversion: recent developments |
we present an analysis of spectroscopic and astrometric data from apogee-2 and gaia dr2 to identify structures toward the orion complex. by applying a hierarchical clustering algorithm to the six-dimensional stellar data, we identify spatially and/or kinematically distinct groups of young stellar objects with ages rang... | the apogee-2 survey of the orion star-forming complex. ii. six-dimensional structure |
the oldest, most metal-poor stars in the galactic halo and satellite dwarf galaxies present an opportunity to explore the chemical and physical conditions of the earliest star-forming environments in the universe. we review the fields of stellar archaeology and dwarf galaxy archaeology by examining the chemical abundan... | near-field cosmology with extremely metal-poor stars |
we present a unified description of the scenario of global hierarchical collapse (ghc). ghc constitutes a flow regime of (non-homologous) collapses within collapses, in which all scales accrete from their parent structures, and small, dense regions begin to contract at later times, but on shorter time-scales than large... | global hierarchical collapse in molecular clouds. towards a comprehensive scenario |
we study molecular outflows in a sample of 45 local galaxies, both star forming and active galactic nucleus (agn), primarily by using co data from the atacama large millimeter/submillimeter array (alma) archive and from the literature. for a subsample, we also compare the molecular outflow with the ionized and neutral ... | cold molecular outflows in the local universe and their feedback effect on galaxies |
is the secondary component of gw190814 the lightest black hole or the heaviest neutron star ever discovered in a double compact-object system [abbott et al. astrophys. j. 896, l44 (2020), 10.3847/2041-8213/ab960f]? this is the central question animating this paper. covariant density functional theory provides a unique ... | gw190814: impact of a 2.6 solar mass neutron star on the nucleonic equations of state |
the mass accretion rate, ṁacc, is a key quantity for the understanding of the physical processes governing the evolution of accretion discs around young low-mass (m⋆ ≲ 2.0 m⊙) stars and substellar objects (ysos). we present here the results of a study of the stellar and accretion properties of the (almost) complete sam... | x-shooter spectroscopy of young stellar objects in lupus. accretion properties of class ii and transitional objects |
the sami galaxy survey will observe 3400 galaxies with the sydney-aao multi-object integral-field spectrograph (sami) on the anglo-australian telescope in a 3-yr survey which began in 2013. we present the throughput of the sami system, the science basis and specifications for the target selection, the survey observatio... | the sami galaxy survey: instrument specification and target selection |
recent developments in compact object astrophysics, especially the discovery of merging neutron stars by ligo, the imaging of the black hole in m87 by the event horizon telescope, and high- precision astrometry of the galactic center at close to the event horizon scale by the gravity experiment motivate the development... | the event horizon general relativistic magnetohydrodynamic code comparison project |
a long-standing question in nuclear physics is whether chargeless nuclear systems can exist. to our knowledge, only neutron stars represent near-pure neutron systems, where neutrons are squeezed together by the gravitational force to very high densities. the experimental search for isolated multi-neutron systems has be... | observation of a correlated free four-neutron system |
context. with the most recent gaia data release, the number of sources with complete 6d phase space information (position and velocity) has increased to well over 33 million stars, while stellar astrophysical parameters are provided for more than 470 million sources, and more than 11 million variable stars are identifi... | gaia data release 3. mapping the asymmetric disc of the milky way |
context. the motion of stars has been used to reveal details of the complex history of the milky way, in constant interaction with its environment. nevertheless, to reconstruct the galactic history puzzle in its entirety, the chemo-physical characterisation of stars is essential. previous gaia data releases were suppor... | gaia data release 3. chemical cartography of the milky way |
bayesian neural network (bnn) approach is employed to improve the nuclear mass predictions of various models. it is found that the noise error in the likelihood function plays an important role in the predictive performance of the bnn approach. by including a distribution for the noise error, an appropriate value can b... | nuclear mass predictions based on bayesian neural network approach with pairing and shell effects |
we study the non-relativistic expansion of general relativity coupled to matter. this is done by expanding the metric and matter fields analytically in powers of 1/c2 where c is the speed of light. in order to perform this expansion it is shown to be very convenient to rewrite general relativity in terms of a timelike ... | non-relativistic gravity and its coupling to matter |
several studies have detected ly$\alpha$ from bright ($m_{uv}\lesssim-21.5$) galaxies during the early stages of reionization despite the significantly neutral igm. to explain these detections, it has been suggested that z>7 ly$\alpha$ emitters (laes) inhabit large, physical mpc (pmpc)-scale ionized regions. however... | insight from jwst/nircam into galaxy overdensities around bright ly$\\alpha$ emitters during reionization: implications for ionized bubbles at $z \\sim 9$ |
we present the host galaxies of four apparently non-repeating fast radio bursts (frbs), frbs 20181223c, 20190418a, 20191220a, and 20190425a, reported in the first canadian hydrogen intensity mapping experiment (chime/frb) catalog. our selection of these frbs is based on a planned hypothesis testing framework where we s... | host galaxies for four nearby chime/frb sources and the local universe frb host galaxy population |
the study of galaxy evolution hinges on our ability to interpret multiwavelength galaxy observations in terms of their physical properties. to do this, we rely on spectral energy distribution (sed) models, which allow us to infer physical parameters from spectrophotometric data. in recent years, thanks to wide and deep... | the art of measuring physical parameters in galaxies: a critical assessment of spectral energy distribution fitting techniques |
the recent alma observations of the disk surrounding hl tau reveal a very complex dust spatial distribution. we present a radiative transfer model accounting for the observed gaps and bright rings as well as radial changes of the emissivity index. we find that the dust density is depleted by at least a factor of 10 in ... | dust and gas in the disk of hl tauri: surface density, dust settling, and dust-to-gas ratio |
context. mergers of two stellar-origin black holes are a prime source of gravitational waves and are under intensive investigation. one crucial ingredient in their modeling has been neglected: pair-instability pulsation supernovae with associated severe mass loss may suppress the formation of massive black holes, decre... | the effect of pair-instability mass loss on black-hole mergers |
motivated by the recent detection of gravitational waves from the black hole binary merger gw150914, we study the dynamical evolution of (stellar-mass) black holes in galactic nuclei, where massive star clusters reside. with masses of ∼ {10}7 {m}⊙and sizes of only a few parsecs, nuclear star clusters (nscs) are the den... | merging black hole binaries in galactic nuclei: implications for advanced-ligo detections |
the early release science results from jwst have yielded an unexpected abundance of high-redshift luminous galaxies that seems to be in tension with current theories of galaxy formation. however, it is currently difficult to draw definitive conclusions form these results as the sources have not yet been spectroscopical... | the millenniumtng project: the galaxy population at z ≥ 8 |
we present models of realistic globular clusters with post-newtonian dynamics for black holes. by modeling the relativistic accelerations and gravitational-wave emission in isolated binaries and during three- and four-body encounters, we find that nearly half of all binary black hole mergers occur inside the cluster, w... | post-newtonian dynamics in dense star clusters: highly eccentric, highly spinning, and repeated binary black hole mergers |
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