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this is the first of three papers that present a detailed guide for working with the codes {\sc tlusty} and {\sc synspec} to generate model stellar atmospheres or accretion disks, and to produce detailed synthetic spectra. in this paper, we present a very brief manual intended for casual users who intend to use these c... | a brief introductory guide to tlusty and synspec |
we compute upper limits on the nanohertz-frequency isotropic stochastic gravitational wave background (gwb) using the 9 year data set from the north american nanohertz observatory for gravitational waves (nanograv) collaboration. well-tested bayesian techniques are used to set upper limits on the dimensionless strain a... | the nanograv nine-year data set: limits on the isotropic stochastic gravitational wave background |
the central nuclei of galaxies, where supermassive black holes (smbhs) are thought to reside, can experience phases of activity when they become active galactic nuclei (agns). an agn can eject winds and jets and produce radiation across the entire electromagnetic spectrum. the fraction of the bolometric emission in the... | the origin of radio emission from radio-quiet active galactic nuclei |
in recent years, the discovery of massive quasars at has provided a striking challenge to our understanding of the origin and growth of supermassive black holes in the early universe. mounting observational and theoretical evidence indicates the viability of massive seeds, formed by the collapse of supermassive stars, ... | titans of the early universe: the prato statement on the origin of the first supermassive black holes |
ever deeper and wider look-back surveys have led to a fairly robust outline of the cosmic star-formation history, which culminated around [formula: see text]; this period is often nicknamed "cosmic noon." our knowledge about star-forming galaxies at these epochs has dramatically advanced from increasingly complete popu... | star-forming galaxies at cosmic noon |
we use the second data releases of the european space agencygaia astrometric survey and the high-resolution galactic archaeology with hermes (galah) spectroscopic survey to analyse the structure of our galaxy's disc components. with galah, we separate the α-rich and α-poor discs (with respect to fe), which are superpos... | the galah survey and gaia dr2: dissecting the stellar disc's phase space by age, action, chemistry, and location |
recently, an anomalous excess was found in the electronic recoil data collected at the xenon1t experiment. the excess may be explained by an axionlike particle (alp) with a mass of a few kev and a coupling to electron of ga e∼10-13, if the alp constitutes all or some fraction of local dark matter (dm). in order to sati... | xenon1t excess from anomaly-free axionlike dark matter and its implications for stellar cooling anomaly |
context. the observation of planets in their formation stage is a crucial but very challenging step in understanding when, how, and where planets form. pds 70 is a young pre-main sequence star surrounded by a transition disk, in the gap of which a planetary-mass companion has recently been discovered. this discovery re... | orbital and atmospheric characterization of the planet within the gap of the pds 70 transition disk |
gravitational potential fluctuations driven by bursty star formation can kinematically `heat up' dark matter at the centres of dwarf galaxies. a key prediction of such models is that, at a fixed dark matter halo mass, dwarfs with a higher stellar mass will have a lower central dark matter density. we use stellar kinema... | dark matter heats up in dwarf galaxies |
one of the primary science goals of the next generation of hard x-ray timing instruments is to determine the equation of state of matter at supranuclear densities inside neutron stars by measuring the radius of neutron stars with different masses to accuracies of a few percent. three main techniques can be used to achi... | colloquium: measuring the neutron star equation of state using x-ray timing |
the australian ska pathfinder (askap) telescope has started to localize fast radio bursts (frbs) to arcsecond accuracy from the detection of a single pulse, allowing their host galaxies to be reliably identified. we discuss the global properties of the host galaxies of the first four frbs localized by askap, which lie ... | the host galaxies and progenitors of fast radio bursts localized with the australian square kilometre array pathfinder |
seven observations point towards the existence of primordial black holes (pbh), constituting the whole or an important fraction of the dark matter in the universe: the mass and spin of black holes detected by advanced ligo/virgo, the detection of micro-lensing events of distant quasars and stars in m31, the non-detecti... | seven hints for primordial black hole dark matter |
it has been recently pointed out that a momentum-dependent coupling of the asymmetric dark matter (adm) with nucleons can explain the broad disagreement between helioseismological observables and the predictions of standard solar models. in this paper, we propose a minimal simplified adm model consisting of a scalar an... | asymmetric dark matter in the sun and diphoton excess at the lhc |
alma observations have revealed the presence of dust in the first generations of galaxies in the universe. however, the dust temperature td remains mostly unconstrained due to the few available fir continuum data at redshift $z$ > 5. this introduces large uncertainties in several properties of high-$z$ galaxies, nam... | the alma rebels survey: cosmic dust temperature evolution out to z 7 |
we propose to develop a wide-field and ultra-high-precision photometric survey mission, temporarily named "earth 2.0 (et)". this mission is designed to measure, for the first time, the occurrence rate and the orbital distributions of earth-sized planets. et consists of seven 30cm telescopes, to be launched to the earth... | et white paper: to find the first earth 2.0 |
in the present paper we obtain an anisotropic analog of the durgapal and fuloria (gen relativ gravit 17:671, 1985) perfect fluid solution. the methodology consists of contraction of the anisotropic factor with the help of both metric potentials and . here we consider the same as durgapal and fuloria (gen relativ gravit... | anisotropic models for compact stars |
context. in november 2019, erosita on board of the spektrum-roentgen-gamma (srg) observatory started to map the entire sky in x-rays. after the four-year survey program, it will reach a flux limit that is about 25 times deeper than rosat. during the srg performance verification phase, erosita observed a contiguous 140 ... | the erosita final equatorial-depth survey (efeds). identification and characterization of the counterparts to point-like sources |
estimates of the source parameters of gravitational-wave (gw) events produced by compact binary mergers rely on theoretical models for the gw signal. we present the first frequency-domain model for the inspiral, merger, and ringdown of the gw signal from precessing binary black hole systems that also includes multipole... | including higher order multipoles in gravitational-wave models for precessing binary black holes |
the recently discovered gravitational wave sources gw190521 and gw190814 have shown evidence of bh mergers with masses and spins outside of the range expected from isolated stellar evolution. these merging objects could have undergone previous mergers. such hierarchical mergers are predicted to be frequent in active ga... | mass-gap mergers in active galactic nuclei |
star formation and supermassive black hole growth in galaxies appear to be self-limiting. the mechanisms for self-regulation are known as feedback. cosmic rays, the relativistic particle component of interstellar and intergalactic plasma, are among the agents of feedback. because cosmic rays are virtually collisionless... | the basis for cosmic ray feedback: written on the wind |
contents of gaia dr2: the five-parameter astrometric solution - positions on the sky (alpha,delta), parallaxes, and proper motions - for more than 1.3 billion (109) sources, with a limiting magnitude of g=21 and a bright limit of g~=3. parallax uncertainties are in the range of up to 0.04 milliarcsecond for sources at ... | vizier online data catalog: gaia dr2 (gaia collaboration, 2018) |
gaia data release 3 provides novel flux-calibrated low-resolution spectrophotometry for ≃220 million sources in the wavelength range 330 nm ≤ λ ≤ 1050 nm (xp spectra). synthetic photometry directly tied to a flux in physical units can be obtained from these spectra for any passband fully enclosed in this wavelength ran... | gaia data release 3. the galaxy in your preferred colours: synthetic photometry from gaia low-resolution spectra |
aerogel fibers have been recognized as the rising star in the fields of thermal insulation and wearable textiles. yet, the lack of functionalization in aerogel fibers limits their applications. herein, we report hygroscopic holey graphene aerogel fibers (licl@hgafs) with integrated functionalities of highly efficient m... | hygroscopic holey graphene aerogel fibers enable highly efficient moisture capture, heat allocation and microwave absorption |
context. data from the gaia satellite are revolutionising our understanding of the milky way. with every new data release, there is a need to update the census of open clusters.aims: we aim to conduct a blind, all-sky search for open clusters using 729 million sources from gaia dr3 down to magnitude g ∼ 20, creating a ... | improving the open cluster census. ii. an all-sky cluster catalogue with gaia dr3 |
we evaluate the redshift distribution of binary black hole (bbh), black hole-neutron star binary (bhns), and binary neutron star (bns) mergers, exploring the main sources of uncertainty: star formation rate (sfr) density, metallicity evolution, common envelope, mass transfer via roche lobe overflow, natal kicks, core-c... | the cosmic merger rate density of compact objects: impact of star formation, metallicity, initial mass function, and binary evolution |
aims: we present a 69 arcmin2 alma survey at 1.1 mm, goods-alma, matching the deepest hst-wfc3 h-band part of the goods-south field.methods: we tapered the 0″24 original image with a homogeneous and circular synthesized beam of 0″60 to reduce the number of independent beams - thus reducing the number of purely statisti... | goods-alma: 1.1 mm galaxy survey. i. source catalog and optically dark galaxies |
the environment of actively repeating fast radio bursts (frbs) has been shown to be complex and varying. the recently localized frb 20190520b is extremely active, has the largest confirmed host dispersion measure, and is only the second frb source associated with a compact, persistent radio source (prs). the main trace... | magnetic field reversal around an active fast radio burst |
tianqin and lisa are space-based laser interferometer gravitational wave (gw) detectors planned to be launched in the mid-2030s. both detectors will detect low-frequency gws around $10^{-2}\,{\rm hz}$, however, tianqin is more sensitive to frequencies above this common sweet-spot while lisa is more sensitive to frequen... | detection of astrophysical gravitational wave sources by tianqin and lisa |
context. it has become clear in recent years that binarity plays a crucial role in many aspects of planetary nebulae (pne), particularly with regard to the striking morphologies they exhibit. to date, there are nearly 60 known binary central stars of pne (bcspne). however, both theory and observation indicate that this... | planetary nebulae seen with tess: discovery of new binary central star candidates from cycle 1 |
we present the first open gravitational-wave catalog, obtained by using the public data from advanced ligo’s first observing run to search for compact-object binary mergers. our analysis is based on new methods that improve the separation between signals and noise in matched-filter searches for gravitational waves from... | 1-ogc: the first open gravitational-wave catalog of binary mergers from analysis of public advanced ligo data |
we present a model for the interaction of the gd-1 stellar stream with a massive perturber that naturally explains many of the observed stream features, including a gap and an off-stream spur of stars. the model involves an impulse by a fast encounter, after which the stream grows a loop of stars at different orbital e... | the spur and the gap in gd-1: dynamical evidence for a dark substructure in the milky way halo |
gravitational-wave observations by the laser interferometer gravitational-wave observatory (ligo) and virgo have provided us a new tool to explore the universe on all scales from nuclear physics to the cosmos and have the massive potential to further impact fundamental physics, astrophysics, and cosmology for decades t... | characterizing gravitational wave detector networks: from a$^\\sharp$ to cosmic explorer |
a gravitational-wave (gw) transient was identified in data recorded by the advanced laser interferometer gravitational-wave observatory (ligo) detectors on 2015 september 14. the event, initially designated g184098 and later given the name gw150914, is described in detail elsewhere. by prior arrangement, preliminary es... | localization and broadband follow-up of the gravitational-wave transient gw150914 |
accurate line lists are crucial for correctly modelling a variety of astrophysical phenomena, including stellar photospheres and the atmospheres of extrasolar planets. this paper presents a new line database toto for the main isotopologues of titanium oxide (tio): ^{46}ti^{16}o, ^{47}ti^{16}o, ^{48}ti^{16}o, ^{49}ti^{1... | exomol molecular line lists - xxxiii. the spectrum of titanium oxide |
with the first detection of gravitational waves from a binary system of neutron stars gw170817, a new window was opened to study the properties of matter at and above nuclear-saturation density. reaching densities a few times that of nuclear matter and temperatures up to 100 mev, such mergers also represent potential s... | postmerger gravitational-wave signatures of phase transitions in binary mergers |
candidates for the modest galaxies that formed most of the stars in the early universe, at redshifts z > 7, have been found in large numbers with extremely deep restframe-ultraviolet imaging. but it has proved difficult for existing spectrographs to characterize them using their ultraviolet light. the detailed prope... | a dusty, normal galaxy in the epoch of reionization |
the sdss-iv apache point observatory galactic evolution experiment (apogee) survey has obtained high-resolution spectra for thousands of red giant stars distributed among the massive satellite galaxies of the milky way (mw): the large and small magellanic clouds (lmc/smc), the sagittarius dwarf galaxy (sgr), fornax (fn... | apogee chemical abundance patterns of the massive milky way satellites |
we combine the equation of state of dense matter up to twice nuclear saturation density nsat obtained using chiral effective field theory (χ eft ) and recent observations of neutron stars to gain insights about the high-density matter encountered in their cores. a key element in our study is the recent bayesian analysi... | limiting masses and radii of neutron stars and their implications |
in 2007, a very bright radio pulse was identified in the archival data of the parkes telescope in australia, marking the beginning of a new research branch in astrophysics. in 2013, this kind of millisecond bursts with extremely high brightness temperature takes a unified name, fast radio burst (frb). over the first fe... | the physics of fast radio bursts |
we present a novel implementation of supermassive black hole (smbh) formation, dynamics and accretion in the massively parallel tree+sph code, changa. this approach improves the modelling of smbhs in fully cosmological simulations, allowing for a more detailed analysis of smbh-galaxy co-evolution throughout cosmic time... | the romulus cosmological simulations: a physical approach to the formation, dynamics and accretion models of smbhs |
the high-energy emission from low-mass stars is mediated by the magnetic dynamo. although the mechanisms by which fully convective stars generate large-scale magnetic fields are not well understood, it is clear that, as for solar-type stars, stellar rotation plays a pivotal role. we present 270 new optical spectra of l... | the hα emission of nearby m dwarfs and its relation to stellar rotation |
in a star cluster with a sufficiently large escape velocity, black holes (bhs) that are produced by bh mergers can be retained, dynamically form new bh binaries, and merge again. this process can repeat several times and lead to significant mass growth. in this paper, we calculate the mass of the largest bh that can fo... | black hole growth through hierarchical black hole mergers in dense star clusters: implications for gravitational wave detections |
we investigate the inner regions of the milky way using data from apogee and gaia edr3. our inner galactic sample has more than 26 500 stars within |xgal|< 5 kpc, |ygal|< 3.5 kpc, |zgal|< 1 kpc, and we also carry out the analysis for a foreground-cleaned subsample of 8000 stars that is more representative of t... | the milky way bar and bulge revealed by apogee and gaia edr3 |
we consider radio bursts that originate from extragalactic neutron stars (nss) by addressing three questions about source distances. what are the physical limitations on coherent radiation at ghz frequencies? do they permit detection at cosmological distances? how many bursts per ns are needed to produce the inferred b... | supergiant pulses from extragalactic neutron stars |
i present an analysis of the jwst nirspec data of smacs 0723 released as early release observations. as part of this three new redshifts are provided, bringing the total of reliable redshifts to 14. i propose a modification to the direct abundance determination method that reduces sensitivity to flux calibration uncert... | high-z galaxies with jwst and local analogues - it is not only star formation |
the ultraviolet (uv) continuum slope (β, where fλ∝ λβ ) of galaxies is sensitive to a variety of properties, from the metallicity and age of the stellar population to dust attenuation throughout the galaxy. considerable attention has focused on identifying reionization-era galaxies with very blue uv slopes (β < -3).... | searching for extremely blue uv continuum slopes at z = 7-11 in jwst/nircam imaging: implications for stellar metallicity and ionizing photon escape in early galaxies |
we describe the milky way survey (mws) that will be undertaken with the dark energy spectroscopic instrument (desi) on the mayall 4 m telescope at the kitt peak national observatory. over the next 5 yr desi mws will observe approximately seven million stars at galactic latitudes |b| > 20°, with an inclusive target s... | overview of the desi milky way survey |
the ligo scientific and virgo collaborations have announced the event gw170817, the first detection of gravitational waves from the coalescence of two neutron stars. the merger rate of binary neutron stars estimated from this event suggests that distant, unresolvable binary neutron stars create a significant astrophysi... | gw170817: implications for the stochastic gravitational-wave background from compact binary coalescences |
on 2019 august 14, the ligo and virgo detectors observed gw190814, a gravitational-wave signal originating from the merger of a $\simeq \,23\,{m}_{\odot }$ black hole (bh) with a $\simeq \,2.6\,{m}_{\odot }$ compact object. gw190814's compact-binary source is atypical both in its highly asymmetric masses and in its low... | exploring the lower mass gap and unequal mass regime in compact binary evolution |
while once rare, observations of stars being tidally disrupted by supermassive black holes are quickly becoming commonplace. to continue to learn from these events, it is necessary to robustly and systematically compare our growing number of observations with theory. we present a tidal disruption module for the modular... | weighing black holes using tidal disruption events |
in this paper we review the current status of research on the observational and theoretical characteristics of isolated and binary magnetic white dwarfs (mwds). | magnetic white dwarfs |
we present a search for extremely red, dust-obscured, z > 7 galaxies with jwst/nircam+miri imaging over the first 20 arcmin2 of publicly available cycle 1 data from the cosmos-web, ceers, and primer surveys. based on their red color in f277w-f444w (~2.5 mag) and detection in miri/f770w (~25 mag), we identify two gal... | two massive, compact, and dust-obscured candidate z ≃ 8 galaxies discovered by jwst |
we present the star cluster hunting pipeline (ship) that can identify star clusters in gaia second data release (dr2) data and establish a star cluster catalog for the galactic disk. a friend-of-friend-based cluster finder method is used to identify star clusters using five-dimensional stellar parameters, l,b,\varpi ,{... | a catalog of newly identified star clusters in gaia dr2 |
as the number of merging binary black holes observed with ground-based gravitational-wave detectors grows, increasingly accurate theoretical models are required to compare them to the observed sample and disentangle contributions from multiple channels. in formation models involving isolated binary stars, important unc... | the role of mass transfer and common envelope evolution in the formation of merging binary black holes |
we present final spitzer trigonometric parallaxes for 361 l, t, and y dwarfs. we combine these with prior studies to build a list of 525 known l, t, and y dwarfs within 20 pc of the sun, 38 of which are presented here for the first time. using published photometry and spectroscopy as well as our own follow-up, we prese... | the field substellar mass function based on the full-sky 20 pc census of 525 l, t, and y dwarfs |
theoretical modeling of massive stars predicts a gap in the black hole (bh) mass function above ∼40-50 m⊙ for bhs formed through single star evolution, arising from (pulsational) pair-instability supernovae (pisne). however, in dense star clusters, dynamical channels may exist that allow construction of bhs with masses... | populating the upper black hole mass gap through stellar collisions in young star clusters |
three-body forces acting on a λ hyperon in a nuclear medium are investigated, with special focus on the so-called hyperon puzzle in neutron stars. the hyperon-nucleon two-body interaction deduced from su(3) chiral effective field theory is employed at next-to-leading order. hyperon-nucleon three-body forces are approxi... | hyperon-nucleon three-body forces and strangeness in neutron stars |
context. clouds are ubiquitous in exoplanet atmospheres and they represent a challenge for the model interpretation of their spectra. when generating a large number of model spectra, complex cloud models often prove too costly numerically, whereas more efficient models may be overly simplified.aims: we aim to constrain... | retrieving scattering clouds and disequilibrium chemistry in the atmosphere of hr 8799e |
in this work, we present a new class of analytic and well-behaved solution to einstein's field equations describing anisotropic matter distribution. it's achieved in the embedding class one spacetime framework using karmarkar's condition. we perform our analysis by proposing a new metric potential grr which yields us a... | anisotropic relativistic fluid spheres: an embedding class i approach |
the variety of star formation histories (sfhs) of z ≳ 6 galaxies provides important insights into early star formation, but has been difficult to systematically quantify. some observations suggest that many z ~ 6-9 galaxies are dominated by ≳200 myr stellar populations, implying significant star formation at z ≳ 9, whi... | star formation histories of uv-luminous galaxies at z ≃ 6.8: implications for stellar mass assembly at early cosmic times |
we present the vimos ultra deep survey (vuds), a spectroscopic redshift survey of ~10 000 very faint galaxies to study the main phase of galaxy assembly in 2 < z ≃ 6. the survey covers 1 deg2 in three separate fields: cosmos, ecdfs, and vvds-02h, with the selection of targets based on an inclusive combination of pho... | the vimos ultra-deep survey: ~10 000 galaxies with spectroscopic redshifts to study galaxy assembly at early epochs 2 < z ≃ 6 |
we present the deep synoptic array (dsa-110) discovery and interferometric localization of the so far non-repeating frb 20220319d. the frb originates in a young, rapidly star-forming barred spiral galaxy, iras 02044$+$7048, at just 50 mpc. although the ne2001 and ymw16 models for the galactic interstellar-medium (ism) ... | deep synoptic array science: a 50 mpc fast radio burst constrains the mass of the milky way circumgalactic medium |
in recent years, the combination of precise quantum monte carlo (qmc) methods with realistic nuclear interactions and consistent electroweak currents, in particular those constructed within effective field theories (efts), has led to new insights in light and medium-mass nuclei, neutron matter, and electroweak reaction... | quantum monte carlo methods in nuclear physics: recent advances |
we present an analysis of seven strongly gravitationally lensed quasars and the corresponding constraints on the properties of dark matter. our results are derived by modelling the lensed image positions and flux-ratios using a combination of smooth macro-models and a population of low-mass haloes within the mass range... | sharp - vii. new constraints on the dark matter free-streaming properties and substructure abundance from gravitationally lensed quasars |
context. water is a key molecule in the physics and chemistry of star and planet formation, but it is difficult to observe from earth. the herschel space observatory provided unprecedented sensitivity as well as spatial and spectral resolution to study water. the water in star-forming regions with herschel (wish) key p... | water in star-forming regions: physics and chemistry from clouds to disks as probed by herschel spectroscopy |
we present a recalibration of the photometric systems in the pantheon+ sample of type ia supernovae (sne ia) including those in the sh0es distance-ladder measurement of h 0. we utilize the large and uniform sky coverage of the public pan-starrs stellar photometry catalog to cross calibrate against tertiary standards re... | the pantheon+ analysis: supercal-fragilistic cross calibration, retrained salt2 light-curve model, and calibration systematic uncertainty |
we present results from the cosmic evolution early release survey on the stellar population parameters for 28 galaxies with redshifts 4 < z < 9 using imaging data from the james webb space telescope (jwst) mid-infrared instrument (miri) combined with data from the hubble space telescope and the spitzer space tele... | ceers key paper. v. galaxies at 4 < z < 9 are bluer than they appear-characterizing galaxy stellar populations from rest-frame1 μm imaging |
context. the improvements in the precision of the published data in gaia edr3 with respect to gaia dr2, particularly for parallaxes and proper motions, offer the opportunity to increase the number of known open clusters in the milky way by detecting farther and fainter objects that have thus far gone unnoticed.aims: ou... | hunting for open clusters in gaia edr3: 628 new open clusters found with ocfinder |
the physical properties of fast radio burst (frb) host galaxies provide important clues towards the nature of frb sources. the 16 frb hosts identified thus far span three orders of magnitude in mass and specific star formation rate, implicating a ubiquitously occurring progenitor object. frbs localized with ~arcsecond ... | the host galaxy and persistent radio counterpart of frb 20201124a |
phoebe 2 is a python package for modeling the observables of eclipsing star systems, but until now it has focused entirely on the forward model—that is, generating a synthetic model given fixed values of a large number of parameters describing the system and the observations. the inverse problem, obtaining orbital and ... | physics of eclipsing binaries. v. general framework for solving the inverse problem |
the fuzzy dark matter (fdm) model treats dm as a bosonic field with an astrophysically large de broglie wavelength. a striking feature of this model is o (1 ) fluctuations in the dark matter density on time scales which are shorter than the gravitational timescale. including, for the first time, the effect of core osci... | strong constraints on fuzzy dark matter from ultrafaint dwarf galaxy eridanus ii |
context. the relevance of m dwarfs in the search for potentially habitable earth-sized planets has grown significantly in the last years.aims: in our on-going effort to comprehensively and accurately characterise confirmed and potential planet-hosting m dwarfs, in particular for the carmenes survey, we have carried out... | carmenes input catalogue of m dwarfs. v. luminosities, colours, and spectral energy distributions |
we characterize the occurrence rate of planets, ranging in size from 0.5 to 16 r ⊕, orbiting fgk stars with orbital periods from 0.5 to 500 days. our analysis is based on results from the “dr25” catalog of planet candidates produced by nasa’s kepler mission and stellar radii from gaia “dr2.” we incorporate additional k... | occurrence rates of planets orbiting fgk stars: combining kepler dr25, gaia dr2, and bayesian inference |
studies of the ages, abundances, and motions of individual stars in the milky way provide one of the best ways to study the evolution of disc galaxies over cosmic time. the formation of the milky way's barred inner region in particular is a crucial piece of the puzzle of disc galaxy evolution. using data from apogee an... | life in the fast lane: a direct view of the dynamics, formation, and evolution of the milky way's bar |
in this review we present a progress report of the connection between long-duration gamma-ray bursts (grbs) and their accompanying supernovae (sne). the analysis is from the point of view of an observer, with much of the emphasis placed on how observations, and the modelling of observations, have constrained what we kn... | the observer's guide to the gamma-ray burst supernova connection |
recent spatially-resolved observations of protoplanetary disks revealed a plethora of substructures, including concentric rings and gaps, inner cavities, misalignments, spiral arms, and azimuthal asymmetries. this is the major breakthrough in studies of protoplanetary disks since protostars and planets vi (ppvi) and is... | structured distributions of gas and solids in protoplanetary disks |
the rotation of a star and the revolutions of its planets are not necessarily aligned. this article reviews the measurement techniques, key findings, and theoretical interpretations related to the obliquities (spin-orbit angles) of planet-hosting stars. the best measurements are for stars with short-period giant planet... | stellar obliquities in exoplanetary systems |
about ten per cent of `massive' stars (those of more than 1.5 solar masses) have strong, large-scale surface magnetic fields1-3. it has been suggested that merging of main-sequence and pre-main-sequence stars could produce such strong fields4,5, and the predicted fraction of merged massive stars is also about ten per c... | stellar mergers as the origin of magnetic massive stars |
sdss-iv manga (mapping nearby galaxies at apache point observatory) is the largest integral-field unit (ifu) spectroscopy survey to date, aiming to observe a statistically representative sample of 10,000 low-redshift galaxies. in this paper, we study the reliability of the emission-line fluxes and kinematic properties ... | the data analysis pipeline for the sdss-iv manga ifu galaxy survey: emission-line modeling |
gamma-ray bursts (grbs), which are bright flashes of gamma rays from extragalactic sources followed by fading afterglow emission, are associated with stellar core collapse events. we report the detection of very-high-energy (vhe) gamma rays from the afterglow of grb 190829a, between 4 and 56 hours after the trigger, us... | revealing x-ray and gamma ray temporal and spectral similarities in the grb 190829a afterglow |
the main sequence (ms) of star-forming (sf) galaxies plays a fundamental role in driving galaxy evolution and our efforts to understand it. however, different studies find significant differences in the normalization, slope, and shape of the ms. these discrepancies arise mainly from the different selection criteria ado... | an objective definition for the main sequence of star-forming galaxies |
lynx is the next-generation observatory which will provide unprecedented x-ray vision into the otherwise invisible universe to gain understanding of origins and physics of the cosmos. lynx will see the dawn of black holes, reveal what drives galaxy formation and evolution, and unveil the energetic side of stellar evolu... | the lynx mission concept study interim report |
kinetic plasma turbulence cascade spans multiple scales ranging from macroscopic fluid flow to sub-electron scales. mechanisms that dissipate large scale energy, terminate the inertial range cascade, and convert kinetic energy into heat are hotly debated. here, we revisit these puzzles using fully kinetic simulation. b... | energy transfer, pressure tensor, and heating of kinetic plasma |
we present a high-resolution (∼0.″12, ∼16 au, mean sensitivity of 50 μjy beam-1 at 225 ghz) snapshot survey of 32 protoplanetary disks around young stars with spectral type earlier than m3 in the taurus star-forming region using the atacama large millimeter array. this sample includes most mid-infrared excess members t... | compact disks in a high-resolution alma survey of dust structures in the taurus molecular cloud |
we combine optical, near-infrared, and mid-infrared spectra and photometry to construct expanded spectral energy distributions for 145 field age (>500 myr) and 53 young (lower age estimate <500 myr) ultracool dwarfs (m6-t9). this range of spectral types includes very low mass stars, brown dwarfs, and planetary ma... | fundamental parameters and spectral energy distributions of young and field age objects with masses spanning the stellar to planetary regime |
the javalambre-physics of the accelerating universe astrophysical survey (j-pas) will scan thousands of square degrees of the northern sky with a unique set of 56 filters using the dedicated 2.55 m javalambre survey telescope (jst) at the javalambre astrophysical observatory. prior to the installation of the main camer... | the minijpas survey: a preview of the universe in 56 colors |
kink oscillations of coronal loops, i.e., standing kink waves, is one of the most studied dynamic phenomena in the solar corona. the oscillations are excited by impulsive energy releases, such as low coronal eruptions. typical periods of the oscillations are from a few to several minutes, and are found to increase line... | kink oscillations of coronal loops |
we use data from the esa gaia mission early data release 3 (edr3) to measure the trigonometric parallax of ω cen, the first high-precision parallax measurement for the most massive globular cluster in the milky way. we use a combination of positional and high-quality proper motion data from edr3 to identify over 100,00... | the parallax of ω centauri measured from gaia edr3 and a direct, geometric calibration of the tip of the red giant branch and the hubble constant |
general relativity can be formulated equivalently with a non-riemannian geometry that associates with an affine connection of nonzero nonmetricity q but vanishing curvature r and torsion t . modification based on this description of gravity generates the f (q ) gravity. in this work, we explore the application of f (q ... | spherically symmetric configuration in f (q ) gravity |
gravitational forces are expected to excite spiral density waves in protoplanetary disks, disks of gas and dust orbiting young stars. however, previous observations that showed spiral structure were not able to probe disk midplanes, where most of the mass is concentrated and where planet formation takes place. using th... | spiral density waves in a young protoplanetary disk |
the gravitational wave (gw) event gw170817 from a binary neutron star merger together with the electromagnetic counterpart showed that the speed of gws ct is very close to that of light for the redshift z < 0.009. this places tight constraints on dark energy models constructed in the framework of modified gravitatio... | dark energy in horndeski theories after gw170817: a review |
the properties of the first galaxies, expected to drive the cosmic dawn and the epoch of reionization, are encoded in the 3d structure of the cosmic 21-cm signal. parameter inference from upcoming 21-cm observations promises to revolutionize our understanding of these unseen galaxies. however, prior inference was done ... | inferring the astrophysics of reionization and cosmic dawn from galaxy luminosity functions and the 21-cm signal |
tidal streams are highly sensitive to perturbations from passing dark matter (dm) subhalos and thus provide a means of measuring their abundance. in a recent paper, we analyzed the distribution of stars along the gd-1 stream with a combination of data from the gaia satellite and the pan-starrs survey, and we demonstrat... | novel constraints on the particle nature of dark matter from stellar streams |
we present panchromatic observations and modeling of supernova (sn) 2020tlf, the first normal type ii-p/l sn with confirmed precursor emission, as detected by the young supernova experiment transient survey. pre-sn activity was detected in riz-bands at -130 days and persisted at relatively constant flux until first lig... | final moments. i. precursor emission, envelope inflation, and enhanced mass loss preceding the luminous type ii supernova 2020tlf |
we present a method to accelerate the evaluation of the likelihood in gravitational wave parameter estimation. parameter estimation codes compute likelihoods of similar waveforms, whose phases and amplitudes differ smoothly with frequency. we exploit this by precomputing frequency-binned overlaps of the best-fit wavefo... | relative binning and fast likelihood evaluation for gravitational wave parameter estimation |
the detection of the binary neutron star merger gw170817 together with the observation of electromagnetic counterparts across the entire spectrum inaugurated a new era of multimessenger astronomy. in this study, we incorporate wavelength-dependent opacities and emissivities calculated from atomic-structure data enablin... | constraints on the neutron star equation of state from at2017gfo using radiative transfer simulations |
we explore the ability of gravitational-wave detectors to extract the redshift distribution of binary black hole (bbh) mergers. the evolution of the merger rate across redshifts 0 < z ≲ 1 is directly tied to the formation and evolutionary processes, providing insight regarding the progenitor formation rate together ... | does the black hole merger rate evolve with redshift? |
processes such as the scattering of alpha particles (4he), the triple-alpha reaction, and alpha capture play a major role in stellar nucleosynthesis. in particular, alpha capture on carbon determines the ratio of carbon to oxygen during helium burning, and affects subsequent carbon, neon, oxygen, and silicon burning st... | ab initio alpha-alpha scattering |
faint lyα emitters become increasingly rarer toward the reionization epoch (z ∼ 6-7). however, observations from a very large (∼5 deg2) lyα narrow-band survey at z = 6.6 show that this is not the case for the most luminous emitters, capable of ionizing their own local bubbles. here we present follow-up observations of ... | evidence for popiii-like stellar populations in the most luminous lyman-α emitters at the epoch of reionization: spectroscopic confirmation |
we calculate the properties of isospin-asymmetric nuclear matter based on chiral nucleon-nucleon (nn) and three-nucleon (3n) interactions. to this end, we develop an improved normal-ordering framework that allows us to include general 3n interactions starting from a plane-wave partial-wave-decomposed form. we present r... | asymmetric nuclear matter based on chiral two- and three-nucleon interactions |
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