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we analyze pre-explosion ultraviolet imaging of the nearby type ii supernova sn 2023ixf in search of precursor variability. no outbursts are seen in observations obtained 15-20 yr prior to explosion to a limit of l nuv ≈ 1000 l ⊙ and l fuv ≈ 2000 l ⊙. the time period of these non-detections roughly corresponds to chang... | no uv-bright eruptions from sn 2023ixf in galex imaging 15-20 yr before explosion |
we present multiwavelength observations of the type ii sn 2020pni. classified at ~1.3 days after explosion, the object showed narrow (fwhm intensity <250 km s-1) recombination lines of ionized helium, nitrogen, and carbon, as typically seen in flash-spectroscopy events. using the non-lte radiative transfer code cmfg... | the early phases of supernova 2020pni: shock ionization of the nitrogen-enriched circumstellar material |
we reconstruct late-time cosmology using the technique of principal component analysis (pca). in particular, we focus on the reconstruction of the dark energy equation of state from two different observational data-sets, supernovae type ia data, and hubble parameter data. the analysis is carried out in two different ap... | reconstruction of latetime cosmology using principal component analysis |
in this paper, we assemble a catalog of 118 strong gravitational lensing systems from the sloan lens acs survey, boss emission-line lens survey, lens structure and dynamics, and strong lensing legacy survey and use them to constrain the cosmic equation of state. in particular, we consider two cases of dark energy pheno... | cosmology with strong-lensing systems |
we apply a novel statistical analysis to measurements of 16 elemental abundances in 34,410 milky way disk stars from the final data release (dr17) of apogee-2. building on recent work, we fit median abundance ratio trends [x/mg] versus [mg/h] with a 2-process model, which decomposes abundance patterns into a "prompt" c... | chemical cartography with apogee: mapping disk populations with a 2-process model and residual abundances |
we present the implementation of updated stellar evolution recipes in the codes nbody6++gpu, mocca, and mcluster. we test them through numerical simulations of star clusters containing 1.1 × 105 stars (with 2.0 × 104 in primordial hard binaries) performing high-resolution direct n-body (nbody6++gpu) and monte carlo (mo... | preparing the next gravitational million-body simulations: evolution of single and binary stars in nbody6++gpu, mocca, and mcluster |
these are exciting times for binary black hole (bbh) research. ligo and virgo detections are progressively drawing a spectacular fresco of bbh masses, spins and merger rates. in this review, we discuss the main formation channels of bbhs from stellar evolution and dynamics. uncertainties on massive star evolution (e.g.... | formation channels of single and binary stellar-mass black holes |
the all-sky automated survey for supernovae (asas-sn) provides long baseline (∼4 yr) light curves for sources brighter than v ≲ 17 mag across the whole sky. as part of our effort to characterize the variability of all the stellar sources visible in asas-sn, we have produced ∼30.1 million v-band light curves for sources... | the asas-sn catalogue of variable stars - v. variables in the southern hemisphere |
we present early-time photometric and spectroscopic observations of the type ia supernova (sn ia) 2021aefx. the early-time u-band light curve shows an excess flux when compared to normal sne ia. we suggest that the early excess blue flux may be due to a rapid change in spectral velocity in the first few days post explo... | a speed bump: sn 2021aefx shows that doppler shift alone can explain early excess blue flux in some type ia supernovae |
we present the first results of our spatially axisymmetric core-collapse supernova simulations with full boltzmann neutrino transport, which amount to a time-dependent five-dimensional (two in space and three in momentum space) problem. special relativistic effects are fully taken into account with a two-energy-grid te... | simulations of core-collapse supernovae in spatial axisymmetry with full boltzmann neutrino transport |
due to their promising applications in low-cost, flexible and high-efficiency photovoltaics, there has been a booming exploration of thin-film solar cells using new absorber materials such as sb2se3, sns, fes2, cusbs2 and cusbse2. among them, sb2se3-based solar cells are a viable prospect because of their suitable band... | antimony selenide thin-film solar cells |
we present an overview of the carnegie-chicago hubble program, an ongoing program to obtain a 3% measurement of the hubble constant (h 0) using alternative methods to the traditional cepheid distance scale. we aim to establish a completely independent route to h 0 using rr lyrae variables, the tip of the red giant bran... | the carnegie-chicago hubble program. i. an independent approach to the extragalactic distance scale using only population ii distance indicators |
we present results from fully relativistic three-dimensional core-collapse supernova simulations of a non-rotating 15{m}⊙star using three different nuclear equations of state (eoss). from our simulations covering up to ∼350 ms after bounce, we show that the development of the standing accretion shock instability (sasi)... | a new gravitational-wave signature from standing accretion shock instability in supernovae |
we are monitoring 27 galaxies within 10 mpc using the large binocular telescope to search for failed supernovae (sne), massive stars that collapse to form a black hole without an sn explosion. we present the results from the first 4 yr of survey data, during which these galaxies were observed to produce three successfu... | the search for failed supernovae with the large binocular telescope: first candidates |
\object{sn 2021aefx} is a normal type ia supernova (sn) with red excess emission over the first $\sim$ 2 days. we present detailed analysis of this sn using our high-cadence kmtnet multi-band photometry, spectroscopy, and publicly available data. we provide the first measurements of its epochs of explosion (mjd 59529.3... | origin of high-velocity ejecta and early red excess emission in the infant type ia supernova 2021aefx |
in a previously presented proof-of-principle study, we established a parameterized spherically symmetric explosion method (push) that can reproduce many features of core-collapse supernovae (ccsne) for a wide range of pre-explosion models. the method is based on the neutrino-driven mechanism and follows collapse, bounc... | pushing core-collapse supernovae to explosions in spherical symmetry. iii. nucleosynthesis yields |
km3net will be a network of deep-sea neutrino telescopes in the mediterranean sea. the km3net/arca detector, to be installed at the capo passero site (italy), is optimised for the detection of high-energy neutrinos of cosmic origin. thanks to its geographical location on the northern hemisphere, km3net/arca can observe... | sensitivity of the km3net/arca neutrino telescope to point-like neutrino sources |
we show that for supergiants, net angular momentum is not a necessary condition for forming accretion discs during core collapse. even absent net rotation, convective motions in the outer parts of supergiants generate mean horizontal flows at a given radius with velocities of {∼ } 1 {km s}^{-1}; the direction of the me... | black hole accretion discs and luminous transients in failed supernovae from non-rotating supergiants |
to further gain insight into whether pre-recombination models can resolve the hubble tension, we explore constraints on the evolution of the cosmic background that are insensitive to early universe physics. the analysis of the cmb anisotropy has been thought to highly rely on early universe physics. however, we show th... | early universe physics insensitive and uncalibrated cosmic standards: constraints on ωm and implications for the hubble tension |
we investigate the characteristics of the gamma-ray signal following the decay of mev-scale axion-like particles (alps) coupled to photons which are produced in a supernova (sn) explosion. this analysis is the first to include the production of heavier alps through the photon coalescence process, enlarging the mass ran... | investigating the gamma-ray burst from decaying mev-scale axion-like particles produced in supernova explosions |
the gas-phase metallicity of low-mass galaxies increases with increasing stellar mass (m*) and is nearly constant for high-mass galaxies. theory suggests that this tight mass-metallicity relationship is shaped by galactic outflows removing metal-enriched gas from galaxies. here, we observationally model the outflow met... | metal-enriched galactic outflows shape the mass-metallicity relationship |
the fast flavor instability (ffi) is expected to be ubiquitous in core-collapse supernovae and neutron star mergers. it rapidly shuffles neutrino flavor in a way that could impact the explosion mechanism, neutrino signals, mass outflows, and nucleosynthesis. the variety of initial conditions and simulation methods empl... | code comparison for fast flavor instability simulations |
the optical and optical/near-infrared pseudo-bolometric light curves of 85 stripped-envelope supernovae (sne) are constructed using a consistent method and a standard cosmology. the light curves are analysed to derive temporal characteristics and peak luminosity lp, enabling the construction of a luminosity function. s... | the bolometric light curves and physical parameters of stripped-envelope supernovae |
the recent gaia dr2 measurements of distances to galactic novae have allowed to re-analyse some properties of nova populations in the milky way and in external galaxies on new and more solid empirical bases. in some cases, we have been able to confirm results previously obtained, such as the concept of nova populations... | observations of galactic and extragalactic novae |
anisotropic layered semiconductors have attracted significant interest due to the huge possibility of bringing new functionalities to thermoelectric, electronic and optoelectronic devices. currently, most reports on anisotropy have concentrated on black phosphorus and res2, less effort has been contributed to other lay... | physical vapor deposition synthesis of two-dimensional orthorhombic sns flakes with strong angle/temperature-dependent raman responses |
sub-chandrasekhar mass carbon-oxygen white dwarfs with a surface helium shell have been proposed as progenitors of type ia supernovae (sne ia). if true, the resulting thermonuclear explosions should be able to account for at least some of the range of sne ia observables. to study this, we conducted a parameter study ba... | double detonations of sub-mch co white dwarfs: variations in type ia supernovae due to different core and he shell masses |
magnetic reconnection is a universal process that powers explosive energy-release events such as solar flares, geomagnetic substorms and some astrophysical jets. a characteristic feature of magnetic reconnection is the production of fast reconnection outflow jets near the plasma alfvén speeds1,2. in eruptive solar flar... | the origin of underdense plasma downflows associated with magnetic reconnection in solar flares |
context. gamma-ray bursts (grbs) are the most energetics explosions in the universe. they are detectable up to very high redshifts. they may therefore be used to study the expansion rate of the universe and to investigate the observational properties of dark energy, provided that empirical correlations between spectral... | cosmology with gamma-ray bursts. i. the hubble diagram through the calibrated ep,i-eiso correlation |
our understanding of the convective-engine paradigm driving core-collapse supernovae has been used for two decades to predict the remnant mass distribution from stellar collapse. these predictions improve as our understanding of this engine increases. in this paper, we review our current understanding of convection (in... | the effect of supernova convection on neutron star and black hole masses |
we investigate galactic winds driven by supernova (sn) explosions in an isolated dwarf galaxy using high-resolution (particle mass m_gas = 1 m_⊙, number of neighbour nngb = 100) smoothed-particle hydrodynamics simulations that include non-equilibrium cooling and chemistry, individual star formation, stellar feedback, a... | supernova-driven winds in simulated dwarf galaxies |
we present observations of four rapidly rising (trise ≈ 10 days) transients with peak luminosities between those of supernovae (sne) and superluminous sne (mpeak ≈ -20)—one discovered and followed by the palomar transient factory (ptf) and three by the supernova legacy survey. the light curves resemble those of sn 2011... | rapidly rising transients in the supernova—superluminous supernova gap |
several types of extragalactic high-energy transients have been discovered, which include high-luminosity and low-luminosity long-duration gamma-ray bursts (grbs), short-duration grbs, supernova shock breakouts (sbos), and tidal disruption events (tdes) without or with an associated relativistic jet. in this paper, we ... | extragalactic high-energy transients: event rate densities and luminosity functions |
we present zoom-in, adaptive mesh refinement, high-resolution (≃30 pc) simulations of high-redshift (z ≃ 6) galaxies with the aim of characterizing their internal properties and interstellar medium. among other features, we adopt a star formation model based on a physically sound molecular hydrogen prescription, and in... | zooming on the internal structure of z≃6 galaxies |
we analyze 143 type ia supernovae (sne ia) observed in h band (1.6-1.8 μm) and find that sne ia are intrinsically brighter in h band with increasing host galaxy stellar mass. we find that sne ia in galaxies more massive than 1010.43 m ⊙ are 0.13 ± 0.04 mag brighter in h than sne ia in less massive galaxies. the same se... | are type ia supernovae in rest-frame h brighter in more massive galaxies? |
the orbital parameters of binaries at intermediate periods (102-103 d) are difficult to measure with conventional methods and are very incomplete. we have undertaken a new survey, applying our pulsation timing method to kepler light curves of 2224 main-sequence a/f stars and found 341 non-eclipsing binaries. we calcula... | finding binaries from phase modulation of pulsating stars with kepler: v. orbital parameters, with eccentricity and mass-ratio distributions of 341 new binaries |
this study aims to elucidate the tension in the hubble constant ($h_0$), a key metric in cosmology representing the universe's expansion rate. conflicting results from independent measurements such as the planck satellite mission and the sh0es collaboration have sparked interest in exploring alternative cosmological mo... | the tension in the absolute magnitude of type ia supernovae |
collective neutrino oscillations play a crucial role in transporting lepton flavor in astrophysical settings, such as supernovae, where the neutrino density is large. in this regime, neutrino-neutrino interactions are important and simulations in the mean-field approximation show evidence for collective oscillations oc... | entanglement and many-body effects in collective neutrino oscillations |
we make a comparison for ten typical, popular dark energy models according to their capabilities of fitting the current observational data. the observational data we use in this work include the jla sample of type ia supernovae observation, the planck 2015 distance priors of cosmic microwave background observation, the... | comparison of dark energy models after planck 2015 |
we use hydrodynamical simulations in a (256 pc)3 periodic box to model the impact of supernova (sn) explosions on the multiphase interstellar medium (ism) for initial densities n = 0.5-30 cm-3 and sn rates 1-720 myr-1. we include radiative cooling, diffuse heating, and the formation of molecular gas using a chemical ne... | modelling the supernova-driven ism in different environments |
deep space observations of the jwst have revealed that the structure and masses of very early universe galaxies at high redshifts ($z\sim15$), existing at $\sim$0.3 gyr after the big bang, may be as evolved as the galaxies in existence for $\sim10$ gyr. the jwst findings are thus in strong tension with the ${\rm{\lambd... | jwst early universe observations and λcdm cosmology |
context. a fundamental property determining the transient behaviour of core-collapse supernovae (cc sne) is the amount of radioactive 56ni synthesised in the explosion. using established methods, this is a relatively easy parameter to extract from observations.aims: i provide a meta-analysis of all published 56ni masse... | a meta-analysis of core-collapse supernova 56ni masses |
we investigate the impact of different properties of the nuclear equation of state in core-collapse supernovae, with a focus on the proto-neutron-star contraction and its impact on the shock evolution. to this end, we introduce a range of equations of state that vary the nucleon effective mass, incompressibility, symme... | equation of state effects in core-collapse supernovae |
in very dense environments, neutrinos can undergo fast flavor conversions on scales as short as a few centimeters provided that the angular distribution of the neutrino lepton number crosses zero. this work presents the first attempt to establish whether the non-negligible abundance of muons and their interactions with... | fast neutrino flavor conversions in one-dimensional core-collapse supernova models with and without muon creation |
mass loss processes are a key uncertainty in the evolution of massive stars. they determine the amount of mass and angular momentum retained by the star, thus influencing its evolution and presupernova structure. because of the high complexity of the physical processes driving mass loss, stellar evolution calculations ... | systematic survey of the effects of wind mass loss algorithms on the evolution of single massive stars |
we report updated results for the first 7 yr of our programme to monitor 27 galaxies within 10 mpc using the large binocular telescope to search for failed supernovae (sne) - core collapses of massive stars that form black holes without luminous sne. in the new data, we identify no new compelling candidates and confirm... | the search for failed supernovae with the large binocular telescope: constraints from 7 yr of data |
i present a progress report on including all the lines in the line lists, including all the lines in the opacities, and including all the lines in the model atmosphere and spectrum synthesis calculations. the increased opacity will improve stellar atmosphere, pulsation, stellar interior, asteroseismology, nova, superno... | including all the lines: data releases for spectra and opacities through 2017 |
we use cosmological, magnetohydrodynamical simulations of milky way-mass galaxies from the auriga project to study their enrichment with rapid neutron capture (r-process) elements. we implement a variety of enrichment models from both binary neutron star mergers and rare core-collapse supernovae. we focus on the abunda... | neutron star mergers and rare core-collapse supernovae as sources of r-process enrichment in simulated galaxies |
context. about 20% of all b-type stars are classical be stars - stars whose spectra imply the presence of a circumstellar decretion disk. the disk phenomenon is strongly correlated with rapid rotation, the origin of which remains unclear. it may be rooted in single- or binary-star evolution. in the framework of the bin... | investigating the lack of main-sequence companions to massive be stars |
it is widely known that the gas in galaxy discs is highly turbulent, but there is much debate on which mechanism can energetically maintain this turbulence. among the possible candidates, supernova (sn) explosions are likely the primary drivers but doubts remain on whether they can be sufficient in regions of moderate ... | evidence for supernova feedback sustaining gas turbulence in nearby star-forming galaxies |
we introduce meraxes, a new, purpose-built semi-analytic galaxy formation model designed for studying galaxy growth during reionization. meraxes is the first model of its type to include a temporally and spatially coupled treatment of reionization and is built upon a custom (100 mpc)3 n-body simulation with high tempor... | dark-ages reionization and galaxy formation simulation - iii. modelling galaxy formation and the epoch of reionization |
the evolution of a type iin supernova (sn iin) is governed by the interaction between the sn ejecta and a hydrogen-rich circumstellar medium. the sne iin thus allow us to probe the late-time mass-loss history of their progenitor stars. we present a sample of sne iin from the untargeted, magnitude-limited surveys of the... | type iin supernova light-curve properties measured from an untargeted survey sample |
wolf-rayet stars of the carbon sequence (wc stars) are an important cornerstone in the late evolution of massive stars before their core collapse. as core-helium burning, hydrogen-free objects with huge mass-loss, they are likely the last observable stage before collapse and thus promising progenitor candidates for typ... | the galactic wc and wo stars. the impact of revised distances from gaia dr2 and their role as massive black hole progenitors |
we describe catalogue-level simulations of type ia supernova (sn ia) light curves in the dark energy survey supernova program (des-sn) and in low-redshift samples from the center for astrophysics (cfa) and the carnegie supernova project (csp). these simulations are used to model biases from selection effects and light-... | first cosmology results using type ia supernova from the dark energy survey: simulations to correct supernova distance biases |
we present a catalog containing 839 candidate post-common envelope systems. common envelope evolution is very important in stellar astrophysics, particularly in the context of very compact and short-period binaries, including cataclysmic variables, as progenitors of, e.g., supernovae type ia or mergers of black holes a... | a catalog of potential post-common envelope binaries |
the chemical abundance patterns of gas and stars in galaxies are powerful probes of galaxies' star formation histories and the astrophysics of galaxy assembly but are challenging to measure with confidence in distant galaxies. in this paper, we report the first measurements of the correlation between stellar mass (m *)... | chemical abundance scaling relations for multiple elements in z ≃ 2-3 star-forming galaxies |
in star-forming galaxies, the far-infrared (fir) and radio-continuum luminosities obey a tight empirical relation over a large range of star-formation rates (sfr). to understand the physics, we examine magnetohydrodynamic galaxy simulations, which follow the genesis of cosmic ray (cr) protons at supernovae and their ad... | simulating radio synchrotron emission in star-forming galaxies: small-scale magnetic dynamo and the origin of the far-infrared-radio correlation |
a suite of detectors around the world is poised to measure the flavor-energy-time evolution of the ten-second burst of neutrinos from a core-collapse supernova occurring in the milky way or nearby. next-generation detectors to be built in the next decade will have enhanced flavor sensitivity and statistics. not only wi... | supernova signatures of neutrino mass ordering |
shocks and turbulence are spectacular, ubiquitous phenomena. in this work, we investigate, by kinetic simulations, the interaction between a supercritical shock and fully developed plasma turbulence. we demonstrate how turbulence dramatically changes the phase space transport due to a complex interaction. two main find... | phase space transport in the interaction between shocks and plasma turbulence |
we present the results of an extensive hubble space telescope imaging study of 105, mostly swift, long-duration gamma-ray bursts (lgrbs) spanning 0.03≲ z≲ 9.4, which were localized using relative astrometry from ground- and space-based afterglow observations. we measure the distribution of lgrb offsets from their host ... | the offset and host light distributions of long gamma-ray bursts: a new view from hst observations of swift bursts |
pre-supernova (sn) outbursts from massive stars may be driven by hydrodynamical wave energy emerging from the core of the progenitor star during late nuclear-burning phases. here, we examine the effects of wave heating in stars containing little or no hydrogen, i.e. progenitors of type iib/ib sne. because there is no m... | pre-supernova outbursts via wave heating in massive stars - ii. hydrogen-poor stars |
a light cp-even standard model (sm) gauge-singlet scalar s can be produced abundantly in the supernova core, via the nucleon bremsstrahlung process n n → n n s, due to its mixing with the sm higgs boson. including the effective s coupling to both nucleons and the pion mediators, we evaluate the production amplitude for... | revisiting supernova constraints on a light cp-even scalar |
we present detailed observations of ztf18abukavn (sn2018gep), discovered in high-cadence data from the zwicky transient facility as a rapidly rising (1.4 ± 0.1 mag hr-1) and luminous ({m}g,{peak}=-20 mag) transient. it is spectroscopically classified as a broad-lined stripped-envelope supernova (ic-bl sn). the high pea... | evidence for late-stage eruptive mass loss in the progenitor to sn2018gep, a broad-lined ic supernova: pre-explosion emission and a rapidly rising luminous transient |
we present bvri and unfiltered light curves of 93 type ia supernovae (sne ia) from the lick observatory supernova search (loss) follow-up program conducted between 2005 and 2018. our sample consists of 78 spectroscopically normal sne ia, with the remainder divided between distinct subclasses (3 sn 1991bg-like, 3 sn 199... | lick observatory supernova search follow-up program: photometry data release of 93 type ia supernovae |
we use cosmological zoom-in simulations of galaxy formation in a milky-way-sized halo started from identical initial conditions to investigate the evolution of galaxy sizes, baryon fractions, morphologies, and angular momenta in runs with different parameters of the star formation-feedback cycle. our fiducial model wit... | the impact of stellar feedback on the structure, size, and morphology of galaxies in milky-way-sized dark matter halos |
the birth kicks of black holes, arising from asymmetric mass ejection or neutrino emission during core-collapse supernovae, are of great interest for both observationally constraining supernova models and population-synthesis studies of binary evolution. recently, several efforts were undertaken to estimate black hole ... | estimates of black hole natal kick velocities from observations of low-mass x-ray binaries |
we present panchromatic observations and modeling of the calcium-rich supernova (sn) 2019ehk in the star-forming galaxy m100 (d ≈ 16.2 mpc) starting 10 hr after explosion and continuing for ∼300 days. sn 2019ehk shows a double-peaked optical light curve peaking at t = 3 and 15 days. the first peak is coincident with lu... | sn 2019ehk: a double-peaked ca-rich transient with luminous x-ray emission and shock-ionized spectral features |
context. grb 111209a, one of the longest gamma-ray bursts (grbs) ever observed, is linked to sn 2011kl, which is the most luminous grb supernova (sn) detected so far. several lines of evidence indicate that this grb-sn is powered by a magnetar central engine.aims: we place sn 2011kl into the context of large samples of... | highly luminous supernovae associated with gamma-ray bursts. i. grb 111209a/sn 2011kl in the context of stripped-envelope and superluminous supernovae |
we present observations of two new hydrogen-poor superluminous supernovae (slsn-i), iptf15esb and iptf16bad, showing late-time hα emission with line luminosities of (1{--}3)× {10}41 erg s-1 and velocity widths of (4000-6000) km s-1. including the previously published iptf13ehe, this makes up a total of three such event... | hydrogen-poor superluminous supernovae with late-time hα emission: three events from the intermediate palomar transient factory |
we present new 1d (spherical) and 2d (axisymmetric) simulations of electron-capture (ec) and low-mass iron-core-collapse supernovae (sn). we consider six progenitor models: the ecsn progenitor from nomoto; two ecsn-like low-mass low-metallicity iron-core progenitors from a. heger (2016, private communication); and the ... | electron-capture and low-mass iron-core-collapse supernovae: new neutrino-radiation-hydrodynamics simulations |
the all-sky automated survey for supernovae provides long baseline (~4 yr) v-band light curves for sources brighter than v≲ 17 mag across the whole sky. we produced v-band light curves for a total of ~61.5 million sources and systematically searched these sources for variability. we identified ~426 000 variables, inclu... | the asas-sn catalogue of variable stars ix: the spectroscopic properties of galactic variable stars |
we introduce the lyra project, a new high-resolution galaxy formation model built within the framework of the cosmological hydrodynamical moving mesh code arepo. the model resolves the multiphase interstellar medium (ism) down to 10 k. it forms individual stars sampled from the initial mass function (imf), and tracks t... | lyra - i. simulating the multiphase ism of a dwarf galaxy with variable energy supernovae from individual stars |
the discrepancy between early-universe inferences and direct measurements of the hubble constant, known as the hubble tension, recently became a pressing subject in high precision cosmology. as a result, a large variety of theoretical models have been proposed to relieve this tension. in this work we analyze a conforma... | can conformally coupled modified gravity solve the hubble tension? |
the detection of gw190521 gains huge attention because it is the most massive binary that ligo and virgo ever confidently detected until the release of gwtc-3 (gw190426_190642 is more massive), and it is the first black hole merger whose remnant is believed to be an intermediate mass black hole. furthermore, the primar... | capability for detection of gw190521-like binary black holes with tianqin |
large composite dark matter states source a scalar binding field that, when coupled to standard model nucleons, provides a potential under which nuclei recoil and accelerate to energies capable of ionization, radiation, and thermonuclear reactions. we show that these dynamics are detectable for nucleon couplings as sma... | accelerating composite dark matter discovery with nuclear recoils and the migdal effect |
we report on a search for electron antineutrinos ( ${\bar{\nu }}_{e}$ ) from astrophysical sources in the neutrino energy range 8.3-30.8 mev with the kamland detector. in an exposure of 6.72 kton-year of the liquid scintillator, we observe 18 candidate events via the inverse beta decay reaction. although there is a lar... | limits on astrophysical antineutrinos with the kamland experiment |
we present high-resolution hydrodynamical simulations of isolated dwarf galaxies including self-gravity, non-equilibrium cooling and chemistry, interstellar radiation fields (isrf) and shielding, star formation, and stellar feedback. this includes spatially and temporally varying photoelectric (pe) heating, photoioniza... | variable interstellar radiation fields in simulated dwarf galaxies: supernovae versus photoelectric heating |
shock waves propagating in collisionless heliospheric and astrophysical plasmas have been studied extensively over the decades. one prime motivation is to understand the nonthermal particle acceleration at shocks. although the theory of diffusive shock acceleration (dsa) has long been the standard for cosmic-ray accele... | nonthermal electron acceleration at collisionless quasi-perpendicular shocks |
for decades, optical time-domain searches have been tuned to find ordinary supernovae, which rise and fall in brightness over a period of weeks. recently, supernova searches have improved their cadences and a handful of fast-evolving luminous transients have been identified1-5. these have peak luminosities comparable t... | a fast-evolving luminous transient discovered by k2/kepler |
we use the latest compilation of observational hubble parameter measurements estimated with the differential evolution of cosmic chronometers, in combination with the local value of the hubble constant recently measured with 2.4% precision, to constrain the cosmological scenario where dark energy interacts directly wit... | new constraints on interacting dark energy from cosmic chronometers |
the majority of thermonuclear explosions in the universe seem to proceed in a rather standardized way, as explosions of carbon-oxygen (co) white dwarfs in binary systems, leading to "normal" type ia supernovae (sne ia). however, over the years, a number of objects have been found which deviate from normal sne ia in the... | the extremes of thermonuclear supernovae |
neutrinos play a crucial role in the core-collapse supernova (ccsn) explosion mechanism. the requirement of accurately calculating the transport of neutrinos makes simulations of the ccsn mechanism extremely challenging and computationally expensive. historically, this stiff challenge has been met by making approximati... | the impact of different neutrino transport methods on multidimensional core-collapse supernova simulations |
context. in the classical picture, electron-capture supernovae and the accretion-induced collapse of oxygen-neon white dwarfs undergo an oxygen deflagration phase before gravitational collapse produces a neutron star. these types of core collapse events are postulated to explain several astronomical phenomena. in this ... | do electron-capture supernovae make neutron stars?. first multidimensional hydrodynamic simulations of the oxygen deflagration |
we introduce a model-independent approach to the null test of the cosmic curvature, which is geometrically related to the hubble parameter h (z ) and luminosity distance dl(z ). combining the independent observations of h (z ) and dl(z ), we use the model-independent smoothing technique, gaussian processes, to reconstr... | null test of the cosmic curvature using h (z ) and supernovae data |
supernova (sn) 2023ixf in m101 is the closest sn explosion observed in the last decade. therefore, it is a suitable test bed to study the role of jets in powering the sn ejecta. with this aim, we explored the idea that high-energy neutrinos could be produced during the interaction between the jets and the intense radia... | low- and high-energy neutrinos from sn 2023ixf in m101 |
simplified analytic methods are frequently used to model the light curves of supernovae and other energetic transients and to extract physical quantities, such as the ejecta mass and amount of radioactive heating. the applicability and quantitative accuracy of these models, however, have not been clearly delineated. he... | physics of luminous transient light curves: a new relation between peak time and luminosity |
central compact objects (ccos) are a handful of sources located close to the geometrical center of young supernova remnants. they only show thermal-like, soft x-ray emission and have no counterparts at any other wavelength. while the first observed cco turned out to be a very peculiar magnetar, discovery that three mem... | central compact objects in supernova remnants |
it has been proposed that sne ia that are normal in their spectra and brightness can be explained by a double detonation that ignites first in a helium shell on the surface of the white dwarf (wd). this proposition is supported by the satisfactory match between simulated explosions of sub-chandrasekhar-mass wds with no... | double detonations with thin, modestly enriched helium layers can make normal type ia supernovae |
supernovae (sne) dominate the energy and momentum budget of stellar feedback, but the efficiency with which they couple to the interstellar medium (ism) depends strongly on how effectively early, pre-sn feedback clears dense gas from star-forming regions. there are observational constraints on the magnitudes and time-s... | which feedback mechanisms dominate in the high-pressure environment of the central molecular zone? |
the mass function for black holes and neutron stars at birth is explored for mass-losing helium stars. these should resemble, more closely than similar studies of single hydrogen-rich stars, the results of evolution in close binary systems. the effects of varying the mass-loss rate and metallicity are calculated using ... | the birth function for black holes and neutron stars in close binaries |
we derive improved stellar luminosity limits on a generic light cp-even scalar field s mixing with the standard model (sm) higgs boson from the supernova sn1987a, the sun, red giants (rgs) and white dwarfs (wds). for the first time, we include the geometric effects for the decay and absorption of s particles in the ste... | improved stellar limits on a light cp-even scalar |
close double degenerate binaries are one of the favoured progenitor channels for type ia supernovae, but it is unclear how many suitable systems there are in the galaxy. we report results of a large radial velocity survey for double degenerate (dd) binaries using the uves spectrograph at the eso vlt (eso sn ia progenit... | the eso supernovae type ia progenitor survey (spy). the radial velocities of 643 da white dwarfs |
dark energy and dark matter constitute 95% of the observable universe. yet the physical nature of these two phenomena remains a mystery. einstein suggested a long-forgotten solution: gravitationally repulsive negative masses, which drive cosmic expansion and cannot coalesce into light-emitting structures. however, cont... | a unifying theory of dark energy and dark matter: negative masses and matter creation within a modified λcdm framework ⋆ |
we present a fully consistent catalog of local and global properties of host galaxies of 882 type ia supernovæ (snia) that were selected based on their light-curve properties, spanning the redshift range 0.01 < z < 1. this catalog corresponds to a preliminary version of the compilation sample and includes superno... | dependence of type ia supernova luminosities on their local environment |
we present a jwst/miri low-resolution mid-infrared (mir) spectroscopic observation of the normal type ia supernova (sn ia) sn 2021aefx at +323 days past rest-frame b-band maximum light. the spectrum ranges from 4 to 14 μm and shows many unique qualities, including a flat-topped [ar iii] 8.991 μm profile, a strongly til... | jwst low-resolution miri spectral observations of sn 2021aefx: high-density burning in a type ia supernova |
starburst galaxies are efficient γ-ray producers, because their high supernova rates generate copious cosmic ray (cr) protons, and their high gas densities act as thick targets off which these protons can produce neutral pions and thence γ-rays. in this paper, we present a first-principles calculation of the mechanisms... | cosmic ray transport in starburst galaxies |
we present optical and near-infrared (nir) (ugriyjh) photometry of host galaxies of type ia supernovae (sn ia) observed by the carnegie supernova project-i. we determine host galaxy stellar masses and, for the first time, study their correlation with sn ia standardized luminosity across optical and nir (ubgvriyjh) band... | the carnegie supernova project-i: correlation between type ia supernovae and their host galaxies from optical to near-infrared bands |
the detection of gw190521 by the ligo-virgo collaboration has revealed the existence of black holes (bhs) in the pair-instability (pi) mass gap. here, we investigate the formation of bhs in the pi mass gap via star-star collisions in young stellar clusters. to avoid pi, the stellar-collision product must have a relativ... | formation of black holes in the pair-instability mass gap: evolution of a post-collision star |
recent observations have successfully detected [o iii] $88.3\, {\rm \mu m}$ and [c ii] $157.6\, {\rm \mu m}$ lines from galaxies in the early universe with the atacama large millimeter array. combining cosmological hydrodynamic simulations and radiative transfer calculations, we present relations between the metal line... | starbursting [o iii] emitters and quiescent [c ii] emitters in the reionization era |
active galactic nuclei (agn) are powered by the accretion of discs of gas on to supermassive black holes (smbhs). stars and stellar remnants orbiting the smbh in the nuclear star cluster (nsc) will interact with the agn disc. orbiters plunging through the disc experience a drag force and, through repeated passage, can ... | aligning nuclear cluster orbits with an active galactic nucleus accretion disc |
the faithful inclusion of the effects of bulk viscosity induced by the presence of chemical reactions is an important issue for simulations of core-collapse supernovae, binary neutron star mergers, and neutron star oscillations, where particle abundances are locally pushed out of chemical equilibrium by rarefaction and... | simulating bulk viscosity in neutron stars. i. formalism |
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