abstract stringlengths 3 192k | title stringlengths 4 857 |
|---|---|
context. previous theoretical works on planet formation around low-mass stars have often been limited to large planets and individual systems. as current surveys routinely detect planets down to terrestrial size in these systems, models have shifted toward a more holistic approach that reflects their diverse architectu... | the new generation planetary population synthesis (ngpps). iv. planetary systems around low-mass stars |
the highly stable spin of neutron stars can be exploited for a variety of (astro)physical investigations. in particular, arrays of pulsars with rotational periods of the order of milliseconds can be used to detect correlated signals such as those caused by gravitational waves. three such `pulsar timing arrays' (ptas) h... | the international pulsar timing array: first data release |
exploring dark matter via observations of extreme astrophysical environments -- defined here as heavy compact objects such as white dwarfs, neutron stars, and black holes, as well as supernovae and compact object merger events -- has been a major field of growth since the last snowmass process. theoretical work has hig... | dark matter in extreme astrophysical environments |
the trappist-1 system is remarkable for its seven planets that are similar in size, mass, density and stellar heating to the rocky planets venus, earth and mars in the solar system1. all the trappist-1 planets have been observed with transmission spectroscopy using the hubble or spitzer space telescopes, but no atmosph... | thermal emission from the earth-sized exoplanet trappist-1 b using jwst |
we present and discuss the results of the herschel gould belt survey (hgbs) observations in an 11 deg2 area of the aquila molecular cloud complex at d 260 pc, imaged with the spire and pacs photometric cameras in parallel mode from 70 μm to 500 μm. using the multi-scale, multi-wavelength source extraction algorithm get... | a census of dense cores in the aquila cloud complex: spire/pacs observations from the herschel gould belt survey |
context. in the last 15 years different ground-based spectroscopic surveys have been started (and completed) with the general aim of delivering stellar parameters and elemental abundances for large samples of galactic stars, complementing gaia astrometry. among those surveys, the gaia-eso public spectroscopic survey, t... | the gaia-eso public spectroscopic survey: implementation, data products, open cluster survey, science, and legacy |
the diffuse interstellar bands are absorption lines seen towards reddened stars. none of the molecules responsible for these bands have been conclusively identified. two bands at 9,632 ångströms and 9,577 ångströms were reported in 1994, and were suggested to arise from c60+ molecules (ref. 3), on the basis of the prox... | laboratory confirmation of c60+ as the carrier of two diffuse interstellar bands |
the mass function of neutron stars (nss) contains information about the late evolution of massive stars, the supernova explosion mechanism, and the equation-of-state of cold, nuclear matter beyond the nuclear saturation density. a number of recent ns mass measurements in binary millisecond pulsar (msp) systems increase... | the millisecond pulsar mass distribution: evidence for bimodality and constraints on the maximum neutron star mass |
for most of their existence, stars are fuelled by the fusion of hydrogen into helium. fusion proceeds via two processes that are well understood theoretically: the proton-proton (pp) chain and the carbon-nitrogen-oxygen (cno) cycle1,2. neutrinos that are emitted along such fusion processes in the solar core are the onl... | experimental evidence of neutrinos produced in the cno fusion cycle in the sun |
the halo of the milky way provides a laboratory to study the properties of the shocked hot gas that is predicted by models of galaxy formation. there is observational evidence of energy injection into the halo from past activity in the nucleus of the milky way1-4; however, the origin of this energy (star formation or s... | detection of large-scale x-ray bubbles in the milky way halo |
we use the illustris simulation to study the relative contributions of in situ star formation and stellar accretion to the build-up of galaxies over an unprecedentedly wide range of masses (m* = 109-1012 m⊙), galaxy types, environments, and assembly histories. we find that the `two-phase' picture of galaxy formation pr... | the stellar mass assembly of galaxies in the illustris simulation: growth by mergers and the spatial distribution of accreted stars |
we present a new version of the galform semi-analytical model of galaxy formation. this brings together several previous developments of galform into a single unified model, including a different initial mass function (imf) in quiescent star formation and in starbursts, feedback from active galactic nuclei suppressing ... | a unified multiwavelength model of galaxy formation |
to date, modern three-dimensional (3d) supernova (sn) simulations have not demonstrated that explosion energies of 1051 erg (=1 bethe=1 b) or more are possible for neutrino-driven sne of non/slow-rotating m < 20 m⊙ progenitors. we present the first such model, considering a nonrotating, solar-metallicity 18.88 m⊙ pr... | self-consistent 3d supernova models from -7 minutes to +7 s: a 1-bethe explosion of a 19 m⊙ progenitor |
this paper is concerned with offline reinforcement learning (rl), which learns using pre-collected data without further exploration. effective offline rl would be able to accommodate distribution shift and limited data coverage. however, prior algorithms or analyses either suffer from suboptimal sample complexities or ... | settling the sample complexity of model-based offline reinforcement learning |
in this work, we shall exhaustively study the effects of modified gravity on the energy spectrum of the primordial gravitational waves background. s. weinberg has also produced significant works related to the primordial gravitational waves, with the most important one being the effects of neutrinos on primordial gravi... | spectrum of primordial gravitational waves in modified gravities: a short overview |
a new collection of photodissociation and photoionisation cross sections for 102 atoms and molecules of astrochemical interest has been assembled, along with a brief review of the basic physical processes involved. these have been used to calculate dissociation and ionisation rates, with uncertainties, in a standard ul... | photodissociation and photoionisation of atoms and molecules of astrophysical interest |
the generation of magnetic field in an electrically conducting fluid generally involves the complicated nonlinear interaction of flow turbulence, rotation and field. this dynamo process is of great importance in geophysics, planetary science and astrophysics, since magnetic fields are known to play a key role in the dy... | the turbulent dynamo |
the rest-frame uv recombination emission line ly$\alpha$ can be powered by ionising photons from young massive stars in star forming galaxies, but its ability to be resonantly scattered by neutral gas complicates its interpretation. for reionization era galaxies, a neutral intergalactic medium (igm) will scatter ly$\al... | jades: the emergence and evolution of ly$\\alpha$ emission and constraints on the igm neutral fraction |
most stars become white dwarfs after they have exhausted their nuclear fuel (the sun will be one such). between one-quarter and one-half of white dwarfs have elements heavier than helium in their atmospheres, even though these elements ought to sink rapidly into the stellar interiors (unless they are occasionally reple... | a disintegrating minor planet transiting a white dwarf |
we assess the science reach and technical feasibility of a satellite mission based on precision atomic sensors configured to detect gravitational radiation. conceptual advances in the past three years indicate that a two-satellite constellation with science payloads consisting of atomic sensors based on laser cooled at... | mid-band gravitational wave detection with precision atomic sensors |
we make an in-depth comparison of the illustristng cosmological simulations with observed quenched fractions of central and satellite galaxies, for mstars = 109-12 m⊙ at 0 ≤ z ≤ 3. we show how measurement choices [aperture, quenched definition, and star formation rate (sfr) indicator time-scale], as well as sample sele... | quenched fractions in the illustristng simulations: comparison with observations and other theoretical models |
we investigate the nature of the double color-magnitude sequence observed in the gaia dr2 hr diagram of stars with high transverse velocities. the stars in the reddest-color sequence are likely dominated by the dynamically hot tail of the thick disk population. information from nissen & schuster and from the apogee... | in disguise or out of reach: first clues about in situ and accreted stars in the stellar halo of the milky way from gaia dr2 |
we report the discovery of an extreme galaxy overdensity at $z = 5.4$ in the goods-s field using jwst/nircam imaging from jades and jems alongside jwst/nircam wide field slitless spectroscopy from fresco. we identified potential members of the overdensity using hst+jwst photometry spanning $\lambda = 0.4-5.0\ \mu\mathr... | the jwst advanced deep extragalactic survey: discovery of an extreme galaxy overdensity at $z = 5.4$ with jwst/nircam in goods-s |
with an instantaneous view of 70% of the sky, the fermi gamma-ray burst monitor (gbm) is an excellent partner in the search for electromagnetic counterparts to gravitational-wave (gw) events. gbm observations at the time of the laser interferometer gravitational-wave observatory (ligo) event gw150914 reveal the presenc... | fermi gbm observations of ligo gravitational-wave event gw150914 |
understanding the origin of the elements has been a decades-long pursuit, with many open questions remaining. old stars found in the milky way and its dwarf satellite galaxies can provide answers because they preserve clean element abundance patterns of the nucleosynthesis processes that operated some 13 billion years ... | from nuclei to the cosmos: tracing heavy-element production with the oldest stars |
thomson optical depth τ measurements from planck provide new insights into the reionization of the universe. in pursuit of model-independent constraints on the properties of the ionizing sources, we determine the empirical evolution of the cosmic ionizing emissivity. we use a simple two-parameter model to map out the e... | reionization after planck: the derived growth of the cosmic ionizing emissivity now matches the growth of the galaxy uv luminosity density |
the primary kepler mission provided nearly continuous monitoring of ∼200,000 objects with unprecedented photometric precision. we present the final catalog of eclipsing binary systems within the 105 deg2 kepler field of view. this release incorporates the full extent of the data from the primary mission (q0-q17 data re... | kepler eclipsing binary stars. vii. the catalog of eclipsing binaries found in the entire kepler data set |
in the past few years, new observations of neutron stars (nss) and ns mergers have provided a wealth of data that allow one to constrain the equation of state (eos) of nuclear matter at densities above nuclear saturation density. however, most observations were based on nss with masses of about 1.4 m⊙, probing densitie... | nuclear physics multimessenger astrophysics constraints on the neutron star equation of state: adding nicer's psr j0740+6620 measurement |
we calculate the motion of binary mass systems in gravity up to the sixth post-newtonian order to the gn3 terms ab initio using momentum expansions within an effective field theory approach based on feynman amplitudes in harmonic coordinates. for these contributions we construct a canonical transformation to isotropic ... | testing binary dynamics in gravity at the sixth post-newtonian level |
context. the third gaia data release (gaia dr3) contains, beyond the astrometry and photometry, dispersed light for hundreds of millions of sources from the gaia prism spectra (bp and rp) and the spectrograph (rvs). this data release opens a new window on the chemo-dynamical properties of stars in our galaxy, essential... | gaia data release 3. apsis. ii. stellar parameters |
we analyse an n-body simulation of the interaction of the milky way (mw) with a sagittarius-like dsph (sgr), looking for signatures which may be attributed to its orbital history in the phase space volume around the sun in light of gaia dr2 discoveries. the repeated impacts of sgr excite coupled vertical and radial osc... | footprints of the sagittarius dwarf galaxy in the gaia data set |
the origins of the stellar-mass black hole mergers discovered by ligo/virgo are still unknown. here we show that if migration traps develop in the accretion disks of active galactic nuclei (agns) and promote the mergers of their captive black holes, the majority of black holes within disks will undergo hierarchical mer... | hierarchical black hole mergers in active galactic nuclei |
the asteroid terrestrial-impact last alert system (atlas) carries out its primary planetary defense mission by surveying about 13,000 deg2 at least four times per night. the resulting data set is useful for the discovery of variable stars to a magnitude limit fainter than r ∼ 18, with amplitudes down to 0.02 mag for br... | a first catalog of variable stars measured by the asteroid terrestrial-impact last alert system (atlas) |
stars lose a significant amount of angular momentum between birth and death, implying that efficient processes transporting it from the core to the surface are active. space asteroseismology delivered the interior rotation rates of more than a thousand low- and intermediate-mass stars, revealing the following: single s... | angular momentum transport in stellar interiors |
we discuss new keck/mosfire spectroscopic observations of four luminous galaxies at z ≃ 7-9 selected to have intense optical line emission by roberts-borsani et al. previous follow-up has revealed lyα in two of the four galaxies. our new mosfire observations confirm that lyα is present in the entire sample. we detect l... | lyα and c iii] emission in z = 7-9 galaxies: accelerated reionization around luminous star-forming systems? |
measurement-device-independent quantum key distribution (mdi qkd) removes all detector side channels and enables secure qkd with an untrusted relay. it is suitable for building a star-type quantum access network, where the complicated and expensive measurement devices are placed in the central untrusted relay and each ... | high-speed measurement-device-independent quantum key distribution with integrated silicon photonics |
galactic rotation curves exhibit diverse behavior in the inner regions while obeying an organizing principle; i.e., they can be approximately described by a radial acceleration relation or the modified newtonian dynamics phenomenology. we analyze the rotation curve data from the sparc sample and explicitly demonstrate ... | reconciling the diversity and uniformity of galactic rotation curves with self-interacting dark matter |
we utilize medium-resolution jwst/nirspec observations of 164 galaxies at z = 2.0-9.3 from the cosmic evolution early release science (ceers) survey to investigate the evolution of the excitation and ionization properties of galaxies at high redshifts. our results represent the first statistical constraints on the evol... | excitation and ionization properties of star-forming galaxies at z = 2.0-9.3 with jwst/nirspec |
understanding strongly correlated phases of matter, such as the quark-gluon plasma and neutron stars, and in particular the dynamics of such systems, for example, following a hamiltonian quench (a sudden change in some hamiltonian parameter, such as the strength of interparticle interactions) is a fundamental challenge... | universal prethermal dynamics of bose gases quenched to unitarity |
we investigate the long-term evolution of black hole accretion discs formed in neutron star mergers. these discs expel matter that contributes to an r-process kilonova, and can produce relativistic jets powering short gamma-ray bursts. here we report the results of a three-dimensional, general-relativistic magnetohydro... | long-term grmhd simulations of neutron star merger accretion discs: implications for electromagnetic counterparts |
this review aims at providing an extensive discussion of modern constraints relevant for dense and hot strongly interacting matter. it includes theoretical first-principle results from lattice and perturbative qcd, as well as chiral effective field theory results. from the experimental side, it includes heavy-ion colli... | theoretical and experimental constraints for the equation of state of dense and hot matter |
since protostars and planets vi (ppvi), our knowledge of the global properties of protoplanetary and debris disks, as well as of young stars, has dramatically improved. at the time of ppvi, mm-observations and optical to near-infrared spectroscopic surveys were largely limited to the taurus star-forming region, especia... | demographics of young stars and their protoplanetary disks: lessons learned on disk evolution and its connection to planet formation |
collisions between galaxy clusters provide a test of the nongravitational forces acting on dark matter. dark matter’s lack of deceleration in the “bullet cluster” collision constrained its self-interaction cross section σdm/m < 1.25 square centimeters per gram (cm2/g) [68% confidence limit (cl)] (σdm, self-interacti... | the nongravitational interactions of dark matter in colliding galaxy clusters |
we present an independent confirmation of the zero-point offset of gaia data release 2 parallaxes using asteroseismic data of evolved stars in the kepler field. using well-characterized red giant branch stars from the apokasc-2 catalog, we identify a gaia astrometric pseudocolor ({ν }eff})- and gaia g-band magnitude-de... | confirmation of the gaia dr2 parallax zero-point offset using asteroseismology and spectroscopy in the kepler field |
context. the trappist-1 system hosts seven earth-sized, temperate exoplanets orbiting an ultra-cool dwarf star. as such, it represents a remarkable setting to study the formation and evolution of terrestrial planets that formed in the same protoplanetary disk. while the sizes of the trappist-1 planets are all known to ... | the nature of the trappist-1 exoplanets |
a recently proposed experimental protocol for quantum gravity induced entanglement of masses (qgem) requires in principle realizable, but still very ambitious, set of parameters in matter-wave interferometry. motivated by easing the experimental realization, in this paper, we consider the parameter space allowed by a s... | quantum gravity witness via entanglement of masses: casimir screening |
we present a new flexible bayesian framework for directly inferring the fraction of neutral hydrogen in the intergalactic medium (igm) during the epoch of reionization (eor, z ∼ 6-10) from detections and non-detections of lyman alpha (lyα) emission from lyman break galaxies (lbgs). our framework combines sophisticated ... | the universe is reionizing at z ∼ 7: bayesian inference of the igm neutral fraction using lyα emission from galaxies |
the merger of binary neutron stars, or of a neutron star and a stellar-mass black hole, can result in the formation of a massive rotating torus around a spinning black hole. in addition to providing collimating media for γ -ray burst jets, unbound outflows from these disks are an important source of mass ejection and r... | three-dimensional general-relativistic magnetohydrodynamic simulations of remnant accretion disks from neutron star mergers: outflows and r -process nucleosynthesis |
during reionization, neutral hydrogen in the intergalactic medium (igm) imprints a damping wing absorption feature on the spectrum of high-redshift quasars. a detection of this signature provides compelling evidence for a significantly neutral universe, and enables measurements of the hydrogen neutral fraction x h i (z... | quantitative constraints on the reionization history from the igm damping wing signature in two quasars at z > 7 |
e-astrogam ('enhanced astrogam') is a breakthrough observatory space mission, with a detector composed by a silicon tracker, a calorimeter, and an anticoincidence system, dedicated to the study of the non-thermal universe in the photon energy range from 0.3 mev to 3 gev - the lower energy limit can be pushed to energie... | science with e-astrogam. a space mission for mev-gev gamma-ray astrophysics |
binary systems containing boson stars—self-gravitating configurations of a complex scalar field—can potentially mimic black holes or neutron stars as gravitational-wave sources. we investigate the extent to which tidal effects in the gravitational-wave signal can be used to discriminate between these standard sources a... | distinguishing boson stars from black holes and neutron stars from tidal interactions in inspiraling binary systems |
the dark energy spectroscopic instrument (desi) is carrying out a five-year survey that aims to measure the redshifts of tens of millions of galaxies and quasars, including 8 million luminous red galaxies (lrgs) in the redshift range 0.4 < z ≲ 1.0. here we present the selection of the desi lrg sample and assess its ... | target selection and validation of desi luminous red galaxies |
we present the initial-final mass relation (ifmr) based on the self-consistent analysis of sirius b and 79 white dwarfs from 13 star clusters. we have also acquired additional signal on eight white dwarfs previously analyzed in the ngc 2099 cluster field, four of which are consistent with membership. these re-observed ... | the white dwarf initial-final mass relation for progenitor stars from 0.85 to 7.5 m ⊙ |
strong gravitational lens systems with time delays between the multiple images allow measurements of time-delay distances, which are primarily sensitive to the hubble constant that is key to probing dark energy, neutrino physics and the spatial curvature of the universe, as well as discovering new physics. we present h... | h0licow - i. h0 lenses in cosmograil's wellspring: program overview |
we report the detection of coherent pulsations from the ultraluminous x-ray source (ulx) ngc 7793 p13. the ≈0.42 s nearly sinusoidal pulsations were initially discovered in broadband x-ray observations using xmm-newton and nustar taken in 2016. we subsequently also found pulsations in archival xmm-newton data taken in ... | discovery of coherent pulsations from the ultraluminous x-ray source ngc 7793 p13 |
the unprecedented range of second-generation gravitational-wave (gw) observatories calls for refining the predictions of potential sources and detection rates. the coalescence of double compact objects (dcos)—i.e., neutron star-neutron star (ns-ns), black hole-neutron star (bh-ns), and black hole-black hole (bh-bh) bin... | double compact objects iii: gravitational-wave detection rates |
the first two orbits of the parker solar probe spacecraft have enabled the first in situ measurements of the solar wind down to a heliocentric distance of 0.17 au (or 36 ${r}_{\odot }$ ). here, we present an analysis of this data to study solar wind turbulence at 0.17 au and its evolution out to 1 au. while many featur... | the evolution and role of solar wind turbulence in the inner heliosphere |
black hole (bh) mergers detectable with the laser interferometer gravitational-wave observatory (ligo) can occur in active galactic nucleus (agn) disks. here we parameterize the merger rates, the mass spectrum, and the spin spectrum of bhs in agn disks. the predicted merger rate spans ∼10-3-104 gpc-1 yr-1, so upper lim... | constraining stellar-mass black hole mergers in agn disks detectable with ligo |
helium is the second-most abundant element in the universe after hydrogen and is one of the main constituents of gas-giant planets in our solar system. early theoretical models predicted helium to be among the most readily detectable species in the atmospheres of exoplanets, especially in extended and escaping atmosphe... | helium in the eroding atmosphere of an exoplanet |
we report spectroscopic and photometric follow-up of a dormant black hole (bh) candidate from gaia dr3. the system, which we call gaia bh2, contains a ~1 m⊙ red giant and a dark companion with mass $m_2 = 8.9\pm 0.3\, {\rm m}_{\odot }$ that is very likely a bh. the orbital period, porb = 1277 d, is much longer than tha... | a red giant orbiting a black hole |
gravitational waves from coalescing neutron stars encode information about nuclear matter at extreme densities, inaccessible by laboratory experiments. the late inspiral is influenced by the presence of tides, which depend on the neutron star equation of state. neutron star mergers are expected to often produce rapidly... | neutron star extreme matter observatory: a kilohertz-band gravitational-wave detector in the global network |
motivated by the recent xenon1t results, we explore various new physics models that can be discovered through searches for electron recoils in o (kev)-threshold direct-detection experiments. first, we consider the absorption of axion-like particles, dark photons, and scalars, either as dark matter relics or being produ... | exploring new physics with o(kev) electron recoils in direct detection experiments |
we present the optical spectroscopic evolution of sn 2023ixf seen in subnight cadence spectra from 1.18 to 15 days after explosion. we identify high-ionization emission features, signatures of interaction with material surrounding the progenitor star, that fade over the first 7 days, with rapid evolution between spectr... | early spectroscopy and dense circumstellar medium interaction in sn 2023ixf |
we present an overview of the large program, "early planet formation in embedded disks (edisk)," conducted with the atacama large millimeter/submillimeter array (alma). the ubiquitous detections of substructures, particularly rings and gaps, in protoplanetary disks around t tauri stars raise the possibility that at lea... | early planet formation in embedded disks (edisk). i. overview of the program and first results |
the milky way halo was predominantly formed by the merging of numerous progenitor galaxies. however, our knowledge of this process is still incomplete, especially in regard to the total number of mergers, their global dynamical properties and their contribution to the stellar population of the galactic halo. here, we u... | the global dynamical atlas of the milky way mergers: constraints from gaia edr3-based orbits of globular clusters, stellar streams, and satellite galaxies |
understanding the properties of dust attenuation curves in galaxies and the physical mechanisms that shape them are among the fundamental questions of extragalactic astrophysics, with great practical significance for deriving the physical properties of galaxies. attenuation curves result from a combination of dust grai... | the dust attenuation law in galaxies |
the recently discovered layered kagome metals a v3sb5 (a =k , rb, cs) have attracted much attention because of their unique combination of superconductivity, charge density wave (cdw) order, and nontrivial band topology. the cdw order with an in-plane 2 ×2 reconstruction is found to exhibit exotic properties, such as t... | coexistence of trihexagonal and star-of-david pattern in the charge density wave of the kagome superconductor a v3sb5 |
we consider the absorption by bound electrons of dark matter in the form of dark photons and axion-like particles, as well as of dark photons from the sun, in current and next-generation direct detection experiments. experiments sensitive to electron recoils can detect such particles with masses between a few ev to mor... | searching for dark absorption with direct detection experiments |
here we present juliet, a versatile tool for the analysis of transits, radial velocities, or both. juliet is built over many available tools for the modelling of transits, radial velocities, and stochastic processes (here modelled as gaussian processes; gps) in order to deliver a tool/wrapper which can be used for the ... | juliet: a versatile modelling tool for transiting and non-transiting exoplanetary systems |
both the mass and radius of the millisecond pulsar psr j0030+0451 have been inferred via pulse-profile modeling of x-ray data obtained by nasa’s neutron star interior composition explorer (nicer) mission. in this letter we study the implications of the mass-radius inference reported for this source by riley et al. for ... | a nicer view of psr j0030+0451: implications for the dense matter equation of state |
the sun's activity cycle governs the radiation, particle and magnetic flux in the heliosphere creating hazardous space weather. decadal-scale variations define space climate and force the earth's atmosphere. however, predicting the solar cycle is challenging. current understanding indicates a short window for predictio... | prediction of the strength and timing of sunspot cycle 25 reveal decadal-scale space environmental conditions |
recent work indicates that the nearby galactic halo is dominated by the debris from a major accretion event. we confirm that result from an analysis of apogee-dr14 element abundances and gaia-dr2 kinematics of halo stars. we show that ∼2/3 of nearby halo stars have high orbital eccentricities (e ≳ 0.8), and abundance p... | the origin of accreted stellar halo populations in the milky way using apogee, gaia, and the eagle simulations |
penetration testing, a crucial industrial practice for ensuring system security, has traditionally resisted automation due to the extensive expertise required by human professionals. large language models (llms) have shown significant advancements in various domains, and their emergent abilities suggest their potential... | pentestgpt: an llm-empowered automatic penetration testing tool |
we explore magnetic-field amplification due to the kelvin-helmholtz instability during binary neutron star mergers. by performing high-resolution general relativistic magnetohydrodynamics simulations with a resolution of 17.5 m for 4-5 ms after the onset of the merger on the japanese supercomputer "k", we find that an ... | efficient magnetic-field amplification due to the kelvin-helmholtz instability in binary neutron star mergers |
we show that terrestrial planets in the habitable zones of m dwarfs older than $\sim$ 1 gyr could have been in runaway greenhouses for several hundred myr following their formation due to the star's extended pre-main sequence phase, provided they form with abundant surface water. such prolonged runaway greenhouses can ... | extreme water loss and abiotic o2buildup on planets throughout the habitable zones of m dwarfs |
analysis of emission lines in gaseous nebulae yields direct measures of physical conditions and chemical abundances and is the cornerstone of nebular astrophysics. although the physical problem is conceptually simple, its practical complexity can be overwhelming since the amount of data to be analyzed steadily increase... | pyneb: a new tool for analyzing emission lines. i. code description and validation of results |
we present new upper limits on the volume-weighted neutral hydrogen fraction, bar{x}_{h i}, at z ∼ 5-6 derived from spectroscopy of bright quasars. the fraction of the lyα and lyβ forests that is `dark' (with zero flux) provides the only model-independent upper limit on bar{x}_{h i}, requiring no assumptions about the ... | model-independent evidence in favour of an end to reionization by z ≈ 6 |
we present year-long, near-infrared hubble space telescope (hst) wfc3 observations used to search for mira variables in ngc 1559, the host galaxy of the type ia supernova (sn ia) sn 2005df. this is the first dedicated search for miras, highly evolved low-mass stars, in an sn ia host, and subsequently the first calibrat... | hubble space telescope observations of mira variables in the sn ia host ngc 1559: an alternative candle to measure the hubble constant |
context. for gaia dr2, 280 million spectra collected by the radial velocity spectrometer instrument on board gaia were processed, and median radial velocities were derived for 9.8 million sources brighter than grvs = 12 mag.aims: this paper describes the validation and properties of the median radial velocities publish... | gaia data release 2. properties and validation of the radial velocities |
we present fully general-relativistic simulations of binary neutron star mergers with a temperature and composition dependent nuclear equation of state. we study the dynamical mass ejection from both quasi-circular and dynamical-capture eccentric mergers. we systematically vary the level of our treatment of the microph... | dynamical mass ejection from binary neutron star mergers |
we use high-resolution cosmological zoom-in simulations from the feedback in realistic environment (fire) project to study the galaxy mass-metallicity relations (mzr) from z = 0-6. these simulations include explicit models of the multiphase ism, star formation, and stellar feedback. the simulations cover halo masses mh... | the origin and evolution of the galaxy mass-metallicity relation |
substantial populations of massive quiescent galaxies at $z\ge3$ challenge our understanding of rapid galaxy growth and quenching over short timescales. in order to piece together this evolutionary puzzle, more statistical samples of these objects are required. established techniques for identifying massive quiescent g... | efficient nircam selection of quiescent galaxies at 3 < z < 6 in ceers |
we present the results from a new search for candidate galaxies at z ≈ 8.5-11 discovered over the 850 arcmin2 area probed by the cosmic assembly near-infrared deep extragalactic legacy survey (candels). we use a photometric-redshift selection including both hubble and spitzer space telescope photometry to robustly iden... | a census of the bright z = 8.5-11 universe with the hubble and spitzer space telescopes in the candels fields |
exoplanets orbiting close to their parent stars may lose some fraction of their atmospheres because of the extreme irradiation. atmospheric mass loss primarily affects low-mass exoplanets, leading to the suggestion that hot rocky planets might have begun as neptune-like, but subsequently lost all of their atmospheres; ... | a giant comet-like cloud of hydrogen escaping the warm neptune-mass exoplanet gj 436b |
the object frb 20180916b is a well-studied repeating fast radio burst source. its proximity (∼150 mpc), along with detailed studies of the bursts, has revealed many clues about its nature, including a 16.3 day periodicity in its activity. here we report on the detection of 18 bursts using lofar at 110-188 mhz, by far t... | lofar detection of 110-188 mhz emission and frequency-dependent activity from frb 20180916b |
the cold interstellar medium (ism) plays a central role in the galaxy evolution process. it is the reservoir that fuels galaxy growth via star formation, the repository of material formed by these stars, and a sensitive tracer of internal and external processes that affect entire galaxies. consequently, significant eff... | the cold interstellar medium of galaxies in the local universe |
au microscopii (au mic) is the second closest pre-main-sequence star, at a distance of 9.79 parsecs and with an age of 22 million years1. au mic possesses a relatively rare2 and spatially resolved3 edge-on debris disk extending from about 35 to 210 astronomical units from the star4, and with clumps exhibiting non-keple... | a planet within the debris disk around the pre-main-sequence star au microscopii |
we describe the design and performance of the near-infrared (1.51-1.70 μm), fiber-fed, multi-object (300 fibers), high resolution (r = λ/δλ ∼ 22,500) spectrograph built for the apache point observatory galactic evolution experiment (apogee). apogee is a survey of ∼105 red giant stars that systematically sampled all mil... | the apache point observatory galactic evolution experiment (apogee) spectrographs |
the data and analysis methodology used for the sdss/apogee data releases 13 and 14 are described, highlighting differences from the dr12 analysis presented in holtzman et al. some improvement in the handling of telluric absorption and persistence is demonstrated. the derivation and calibration of stellar parameters, ch... | apogee data releases 13 and 14: data and analysis |
i introduce some improvements to the ppxf method, which measures the stellar and gas kinematics, star formation history (sfh) and chemical composition of galaxies. i describe the new optimization algorithm that ppxf uses and the changes i made to fit both spectra and photometry simultaneously. i apply the updated ppxf ... | full spectrum fitting with photometry in ppxf: stellar population versus dynamical masses, non-parametric star formation history and metallicity for 3200 lega-c galaxies at redshift z ≈ 0.8 |
we present a uniform catalog of accurate distances to local molecular clouds informed by the gaia dr2 data release. our methodology builds on that of schlafly et al. first, we infer the distance and extinction to stars along sightlines toward the clouds using optical and near-infrared photometry. when available, we inc... | a large catalog of accurate distances to local molecular clouds: the gaia dr2 edition |
ngc 7793 p13 is a variable (luminosity range ∼100) ultraluminous x-ray source proposed to host a stellar-mass black hole of less than 15 m⊙ in a binary system with orbital period of 64 d and a 18-23 m⊙ b9ia companion. within the extras (exploring the x-ray transient and variable sky) project, we discovered pulsations a... | discovery of a 0.42-s pulsar in the ultraluminous x-ray source ngc 7793 p13 |
we present improved estimates of several global properties of the milky way, including its current star formation rate (sfr), the stellar mass contained in its disk and bulge+bar components, as well as its total stellar mass. we do so by combining previous measurements from the literature using a hierarchical bayesian ... | improved estimates of the milky way's stellar mass and star formation rate from hierarchical bayesian meta-analysis |
our milky way should host an ancient, metal-poor, and centrally concentrated stellar population, which reflects the star formation and enrichment in the few most massive progenitors that coalesced at high redshift to form the proto-galaxy. while metal-poor stars are known to reside in the inner few kiloparsecs of our g... | the poor old heart of the milky way |
star-forming regions show a rich and varied chemistry, including the presence of complex organic molecules—in both the cold gas distributed on large scales and the hot regions close to young stars where protoplanetary disks arise. recent advances in observational techniques have opened new possibilities for studying th... | astrochemistry during the formation of stars |
stellar-mass black holes and neutron stars represent extremes in gravity, density, and magnetic fields. they therefore serve as key objects in the study of multiple frontiers of physics. in addition, their origin (mainly in core-collapse supernovae) and evolution (via accretion or, for neutron stars, magnetic spindown ... | the masses and spins of neutron stars and stellar-mass black holes |
we derive analytic, closed form, numerically stable solutions for the total flux received from a spherical planet, moon, or star during an occultation if the specific intensity map of the body is expressed as a sum of spherical harmonics. our expressions are valid to arbitrary degree and may be computed recursively for... | starry: analytic occultation light curves |
we present fitting formulae for the dynamical ejecta properties and remnant disk masses from the largest to date sample of numerical relativity simulations. the considered data include some of the latest simulations with microphysical nuclear equations of state (eos) and neutrino transport as well as other results with... | mapping dynamical ejecta and disk masses from numerical relativity simulations of neutron star mergers |
we present new, more precise measurements of the mass and distance of our galaxy’s central supermassive black hole, sgr a*. these results stem from a new analysis that more than doubles the time baseline for astrometry of faint stars orbiting sgr a*, combining 2 decades of speckle imaging and adaptive optics data. spec... | an improved distance and mass estimate for sgr a* from a multistar orbit analysis |
the assembly and architecture of planetary systems strongly depend on the physical processes governing the evolution and dispersal of protoplanetary disks. since protostars and planets vi, new observations and theoretical insights favor disk winds as being one of those key processes. this chapter provides a comprehensi... | the role of disk winds in the evolution and dispersal of protoplanetary disks |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.