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this paper aims to put constraints on the transition redshift zt, which determines the onset of cosmic acceleration, in cosmological-model independent frameworks. in order to do that, we use the non-parametric gaussian process method with h(z) and sne ia data. the deceleration parameter reconstruction from h(z) data yi... | gaussian process estimation of transition redshift |
the study of core-collapse supernova remnants (snrs) presents a fascinating puzzle, with intricate morphologies and a non-uniform distribution of stellar debris. particularly, young remnants (aged less than 5000 years) hold immense value as they can offer crucial insights into the inner processes of the supernova (sn) ... | modeling the evolution from massive stars to supernovae and supernova remnants |
we assert that non-linear features of fast neutrino-flavor conversion (ffc) can be qualitatively different between core-collapse supernovae (ccsne) and binary neutron star mergers (bnsms). this argument arises from recent global ffc simulations in bnsm, in which fast flavor swap (ffs) emerges in very narrow spatial reg... | fast neutrino-flavor swap in high-energy astrophysical environments |
we present a hydrodynamical simulation at sub-parsec and few-solar-mass resolution of a merger between two gas-rich dwarf galaxies. our simulation includes a detailed model for the multi-phase interstellar medium and is able to follow the entire formation history of spatially resolved star clusters, including feedback ... | the formation of low-metallicity globular clusters in dwarf galaxy mergers |
secret interactions of neutrinos with light new gauge bosons, z', can lead to a rich phenomenology in a supernova explosion as well as in the early universe. this interaction can also lead to new decay modes for charged mesons, π+(k+)→e+ν z' , and subsequently to z'→ν ν ¯. after demonstrating that such an interaction c... | secret interactions of neutrinos with light gauge boson at the dune near detector |
we study diffusive shock acceleration (dsa) of electrons in nonrelativistic quasi-perpendicular shocks using self-consistent one-dimensional particle-in-cell simulations. by exploring the parameter space of sonic and alfvénic mach numbers we find that high mach number quasi-perpendicular shocks can efficiently accelera... | electron acceleration in one-dimensional nonrelativistic quasi-perpendicular collisionless shocks |
the origin of the observed diffuse neutrino flux is not yet known. studies of the relative flavour content of the neutrino flux detected at earth can give information on the production mechanisms at the sources and on flavour mixing, complementary to measurements of the spectral index and normalisation. here we demonst... | energy-dependent flavour ratios in neutrino telescopes from charm |
we present an eigenfunction method to analyze 161 visual light curves (lcs) of type ia supernovae (sne ia) obtained by the carnegie supernova project to characterize their diversity and host-galaxy correlations. the eigenfunctions are based on the delayed-detonation scenario using three parameters: the lc stretch being... | type ia supernova progenitor properties and their host galaxies |
we develop a model for galaxy formation and the growth of supermassive black holes (smbhs), based on the fact that cold dark matter (cdm) halos form their gravitational potential wells through a fast phase with rapid change in the potential, and that the high universal baryon fraction makes cooled gas in halos self-gra... | a two-phase model of galaxy formation: i. the growth of galaxies and supermassive black holes |
supernovae that are strongly gravitationally lensed (glsne) by elliptical galaxies are powerful probes of astrophysics and cosmology that will be discovered systematically by wide-field, high-cadence imaging surveys such as the zwicky transient facility (ztf) and the large synoptic survey telescope (lsst). here we use ... | rates and properties of supernovae strongly gravitationally lensed by elliptical galaxies in time-domain imaging surveys |
shifting the focus of type ia supernova (sn ia) cosmology to the near infrared (nir) is a promising way to significantly reduce the systematic errors, as the strategy minimizes our reliance on the empirical width-luminosity relation and uncertain dust laws. observations in the nir are also crucial for our understanding... | carnegie supernova project-ii: the near-infrared spectroscopy program |
we present a statistical analysis of the environments of 11 supernovae (sne) which occurred in six nearby galaxies (z ≲ 0.016). all galaxies were observed with muse, the high spatial resolution integral-field spectrograph mounted to the 8 m vlt ut4. these data enable us to map the full spatial extent of host galaxies u... | characterizing the environments of supernovae with muse |
type ii supernovae represent the most common stellar explosions in the universe, for which the final stage evolution of their hydrogen-rich massive progenitors towards core-collapse explosion are elusive. the recent explosion of sn 2023ixf in a very nearby galaxy, messier 101, provides a rare opportunity to explore thi... | circumstellar material ejected violently by a massive star immediately before its death |
we present a new multi-dimensional radiation-hydrodynamics code for massive stellar core-collapse in full general relativity (gr). employing an m1 analytical closure scheme, we solve spectral neutrino transport of the radiation energy and momentum based on a truncated moment formalism. regarding neutrino opacities, we ... | a new multi-energy neutrino radiation-hydrodynamics code in full general relativity and its application to the gravitational collapse of massive stars |
neutrinos are known to undergo flavor conversion processes among the three flavors. the fast flavor conversion (ffc) has been the central piece of flavor conversions taking place in core-collapse supernovae (ccsne) due to its shorter timescale to the completion of flavor conversion compared to other types of flavor con... | universality of the neutrino collisional flavor instability in core-collapse supernovae |
we use smoothed-particle hydrodynamics simulations of isolated milky way-mass disk galaxies that include cold, interstellar gas to test subgrid prescriptions for star formation (sf). our fiducial model combines a schmidt law with a gravitational instability criterion, but we also test density thresholds and temperature... | tests of subgrid models for star formation using simulations of isolated disk galaxies |
we study mev-scale electrophilic feebly interacting particles (fips), that may be abundantly produced in supernova (sn) explosions, escape the star and decay into electrons and positrons. this exotic injection of leptons in the milky way leaves an imprint in both photon and cosmic-ray fluxes. specifically, positrons lo... | multimessenger search for electrophilic feebly interacting particles from supernovae |
we present 307 type ia supernova (sn) light curves from the first 4 yr of the transiting exoplanet survey satellite mission. we use this sample to characterize the shapes of the early-time light curves, measure the rise times from first light to peak, and search for companion star interactions. using simulations, we sh... | four years of type ia supernovae observed by tess: early-time light-curve shapes and constraints on companion interaction models |
when collapse of the iron core in a massive red or yellow supergiant does not lead to an energetic supernova, a significant fraction of the convective hydrogen envelope will fall in towards the black hole formed from the collapsing core. the random velocity field in the convective envelope results in finite specific an... | numerical simulations of the random angular momentum in convection - ii. delayed explosions of red supergiants following 'failed' supernovae |
the abundance of carbon relative to oxygen (c/o) is a promising probe of star formation history in the early universe, as the ratio changes with time due to production of these elements by different nucleosynthesis pathways. we present a measurement of $\mathrm{log}({\rm{c}}/{\rm{o}})=-1.01\pm 0.12$ (stat) ±0.15 (sys) ... | early results from glass-jwst. xxi. rapid asembly of a galaxy at z = 6.23 revealed by its c/o abundance |
the gemini high-resolution optical spectrograph (ghost) is the newest high-resolution spectrograph to be developed for a large-aperture telescope, recently deployed and commissioned at the gemini-south telescope. in this paper, we present the first science results from the ghost spectrograph taking during its commissio... | ghost commissioning science results: identifying a new chemically peculiar star in reticulum ii |
a first-order quantum chromodynamics (qcd) phase transition (pt) may take place in the protocompact star (pcs) produced by a core-collapse supernova (ccsn). in this work, we study the consequences of such a pt in a nonrotating ccsn with axisymmetric hydrodynamic simulations. we find that the pt leads to the collapse of... | gravitational-wave signature of a first-order quantum chromodynamics phase transition in core-collapse supernovae |
a small group of the newly discovered superluminous supernovae show broad and slow-evolving light curves. here we present extensive observational data for the slow-evolving superluminous supernova lsq14an, which brings this group of transients to four in total in the low-redshift universe (z < 0.2; sn 2007bi, ptf12d... | complexity in the light curves and spectra of slow-evolving superluminous supernovae |
gravitational waves (gws) provide unobscured insight into the birthplace of neutron stars and black holes in core-collapse supernovae (ccsne). the nuclear equation of state (eos) describing these dense environments is yet uncertain, and variations in its prescription affect the proto-neutron star (pns) and the post-bou... | equation-of-state dependence of gravitational waves in core-collapse supernovae |
with the localization of fast radio bursts (frbs) to galaxies similar to the milky way and the detection of a bright radio burst from sgr j1935+2154 with energy comparable to extragalactic radio bursts, a magnetar origin for frbs is evident. by studying the environments of frbs, evidence for magnetar formation mechanis... | localized fast radio bursts are consistent with magnetar progenitors formed in core-collapse supernovae |
context. after more than 50 years, astronomical research still struggles to reconstruct the history of lithium enrichment in the galaxy and to establish the relative importance of the various 7li sources in enriching the interstellar medium (ism) with this fragile element.aims: to better trace the evolution of lithium ... | the gaia-eso survey: galactic evolution of lithium from idr6 |
in environments such as core-collapse supernovae, neutron star mergers, or the early universe, where the neutrino fluxes can be extremely high, neutrino-neutrino interactions are appreciable and contribute substantially to their flavor evolution. such a system of interacting neutrinos can be regarded as a quantum many-... | spectral splits and entanglement entropy in collective neutrino oscillations |
we present photometric and spectroscopic observations of supernova 2020oi (sn 2020oi), a nearby (~17 mpc) type-ic supernova (sn ic) within the grand-design spiral m100. we undertake a comprehensive analysis to characterize the evolution of sn 2020oi and constrain its progenitor system. we detect flux in excess of the f... | an early-time optical and ultraviolet excess in the type-ic sn 2020oi |
recent surveys show that wide (>104 au) binaries and triples are abundant in the field. we study the long-term evolution of wide hierarchical triple systems and the role played by the galactic tidal (gt) field. we find that when the time-scales of the secular von-ziepel-lidov-kozai and the gt oscillations are compar... | chaotic dynamics of wide triples induced by galactic tides: a novel channel for producing compact binaries, mergers, and collisions |
the etherington reciprocity theorem, or distance duality relation (ddr), relates the mutual scaling of cosmic distances in any metric theory of gravity where photons are massless and propagate on null geodesics. in this paper, we make use of the ddr to build a consistency check based on its degeneracy with the hubble c... | the resilience of the etherington-hubble relation |
in this work, we explore how modified gravity theories based on the nonmetricity scalar, known as f (q ) gravity, affect the propagation of gravitational waves from inspiraling of binary systems. we discuss forecast constraints on f (q ) gravity by considering standard siren events in two contexts: (i) simulated source... | forecasting constraints on deviations from general relativity in f (q ) gravity with standard sirens |
collective neutrino oscillations play a crucial role in transporting lepton flavor in astrophysical settings like supernovae and neutron star binary merger remnants, which are characterized by large neutrino densities. in these settings, simulations in the mean-field approximation show that neutrino-neutrino interactio... | entanglement and correlations in fast collective neutrino flavor oscillations |
in this paper, we calibrate the amati relation (the e p-e iso correlation) of gamma-ray bursts (grbs) in a cosmology-independent way. by using a gaussian process to reconstruct the smoothed luminosity distance from the pantheon type ia supernovae sample, we utilize the reconstructed results to calibrate the e p-e iso c... | calibrating gamma-ray bursts by using a gaussian process with type ia supernovae |
we investigate the peculiar nature of strange stars through an analysis of different quark models, i.e. vbag model and cfl model equation of states at different parameter sets, and focus on understanding the equation of state governing the intriguing central compact object (cco) within the supernova remnant hess j1731-... | quark models and radial oscillations: decoding the hess j1731-347 compact object's equation of state |
we present a forecast of the cosmological parameter estimation using fast radio bursts (frbs) from the upcoming square kilometre array (ska), focusing on the issues of dark energy, the hubble constant, and baryon density. we simulate 105 and 106 localized frbs from a 10-year ska observation, and find that: (1) using 10... | cosmology with fast radio bursts in the era of ska |
stellar-mass black holes can become embedded within the disks of active galactic nuclei (agns). afterwards, their interactions are mediated by their gaseous surroundings. here, we study the evolution of stellar-mass binary black holes (bbhs) embedded within agn disks using three-dimensional hydrodynamic simulations and... | the hydrodynamic evolution of binary black holes embedded within the vertically stratified disks of active galactic nuclei |
we present a phenomenological model to investigate the chiral phase transition characterized by parity doubling in dense, beta equilibrated, cold matter. our model incorporates effective interactions constrained by su(3) relations and considers baryonic degrees of freedom. by constraining the model with astrophysical d... | su(3) parity doubling in cold neutron star matter |
in this paper, we investigate the interaction between early dark energy (ede) and scalar field dark matter, proposing a coupled scalar fields model to address the hubble tension and s8 tension. while the ede model successfully alleviates the hubble tension, it exacerbates the s8 tension. to mitigate the negative impact... | alleviating cosmological tensions with a coupled scalar fields model |
we perform the first 3d ab-initio general-relativistic neutrino-radiation hydrodynamics of a long-lived neutron star merger remnant spanning a fraction of its cooling timescale. we find that neutrino cooling becomes the dominant energy loss mechanism after the gravitational-wave dominated phase (~20 ms postmerger). ele... | ab-initio general-relativistic neutrino-radiation hydrodynamics simulations of long-lived neutron star merger remnants to neutrino cooling timescales |
using relativistic supernova simulations of massive progenitor stars with a quark-hadron equation of state (eos) and a purely hadronic eos, we identify a distinctive feature in the gravitational-wave signal that originates from a buoyancy-driven mode (g mode) below the proto-neutron star convection zone. the mode frequ... | gravitational waves from a core g mode in supernovae as probes of the high-density equation of state |
i present the effervescent zone model to account for the compact dense circumstellar material (csm) around the progenitor of the core collapse supernova (ccsn) sn 2023ixf. the effervescent zone is composed of bound dense clumps that are lifted by stellar pulsation and envelope convection to distances of ≈tens × au, and... | a pre-explosion effervescent zone for the circumstellar material in sn 2023ixf |
the evolved stages of massive stars are poorly understood, but invaluable constraints can be derived from spatially resolved observations of nearby red supergiants, such as betelgeuse. alma observations of betelgeuse showing a dipolar velocity field have been interpreted as evidence for a rotation rate of $v\sin i \sim... | is betelgeuse really rotating? synthetic alma observations of large-scale convection in 3d simulations of red supergiants |
the heavy elements (z > 30) are created in neutron (n)-capture processes that are predicted to happen at vastly different nucleosynthetic sites. to study these processes in an environment different from the milky way, we targeted the n-capture elements in red giant branch stars in the sculptor dwarf spheroidal galax... | neutron-capture elements in dwarf galaxies. i. chemical clocks and the short timescale of the r-process |
we investigate the effect of resonant spin conversion of the neutrinos induced by the geometrical phase in a twisting magnetic field. we find that the geometrical phase originating from the rotation of the transverse magnetic field along the neutrino trajectory can trigger a new resonant spin conversion of dirac neutri... | new resonances of supernova neutrinos in twisting magnetic fields |
we present a comprehensive data set of supernova (sn) 2016adj located within the central dust lane of centaurus a. sn 2016adj is significantly reddened and after correcting the peak apparent $b$-band magnitude ($m_b = 17.48\pm0.05$) for milky way reddening and our inferred host-galaxy reddening parameters (i.e., $r_{v}... | the carbon-rich type ic supernova 2016adj in the iconic dust lane of centaurus a: signatures of interaction with circumstellar hydrogen? |
sterile neutrinos can be produced through mixing with active neutrinos in the hot and dense core of a core-collapse supernova (sn). the standard bounds on the active-sterile mixing ($\sin^2 \theta$) from sn arise from sn1987a energy-loss, requiring $e_{\text{loss}}<10^{52}~{\rm erg}$. in this letter, we discuss a no... | low-energy supernovae bounds on sterile neutrinos |
during galactic supernova (sn) explosions, a large amount of feebly interacting particles (fips) may be produced. in this work we analyze electrophilic fips with masses in the mev-range that escape from sn and decay into electron-positron pairs, causing an exotic leptonic injection. this contribution adds up to known c... | robust constraints on feebly interacting particles using xmm-newton |
the hubble tension can be addressed by modifying the sound horizon (rs) before recombination, triggering interest in early universe estimates of the hubble constant, h0, independent of rs. constraints on h0 from an rs-free analysis of the full shape boss galaxy power spectra within λ cdm were recently reported and used... | assessing the robustness of sound horizon-free determinations of the hubble constant |
pulse shape discrimination (psd) is widely used in liquid scintillator (ls) detectors and enables the classification of different particle types based on their energy deposition patterns. psd is particularly valuable in the studies of the diffuse supernova neutrino background (dsnb), nucleon decay, and dark matter sear... | pulse shape discrimination technique for diffuse supernova neutrino background search with juno |
luminous red novae (lrn) are a class of optical transients believed to originate from the mergers of binary stars, or `common envelope' events. their light curves often show secondary maxima, which cannot be explained in the previous models of thermal energy diffusion or hydrogen recombination without invoking multiple... | shock-powered light curves of luminous red novae as signatures of pre-dynamical mass-loss in stellar mergers |
we compare supernovae and baryon acoustic oscillations data to the predictions of a cosmological model of interacting dark matter and dark energy. this theoretical model can be derived from the effective field theory of einstein-cartan gravity with two scaling exponents δg and δλ, related to the interaction between dar... | a model of interacting dark fluids tested with supernovae and baryon acoustic oscillations data |
i identify a point-symmetric morphology composed of three pairs of ears (small lobes) in the x-ray images of the core-collapse supernova remnant (ccsnr) n63a and argue that this morphology supports the jittering jets explosion mechanism (jjem). the opposite two ears in each of the three pairs of snr n63a are not equal ... | jet - counter-jet asymmetry in the jittering jets explosion mechanism of supernovae |
there is a shortage of multiwavelength and spectroscopic follow-up capabilities given the number of transient and variable astrophysical events discovered through wide-field optical surveys such as the upcoming vera c. rubin observatory and its associated legacy survey of space and time. from the haystack of potential ... | a deep-learning approach for live anomaly detection of extragalactic transients |
the value of the hubble constant as constrained by type ia supernovae is directly tied to the zero point of the extragalactic distance scale, which is in turn set by the calibration of astrophysical distance indicators such as the tip of the red giant branch (trgb). in this article, a calibration of the trgb luminosity... | sub-per-cent determination of the brightness at the tip of the red giant branch in the magellanic clouds |
dwarf galaxies are thought to host the remnants of the early universe seed black holes (bhs) and to be dominated by supernova feedback. however, recent studies suggest that bh feedback could also strongly impact their growth. we report the discovery of 35 dwarf galaxies hosting radio active galactic nucleus (agn) out t... | radio jets from agns in dwarf galaxies in the cosmos survey: mechanical feedback out to redshift ∼3.4 |
the clustering of gravitational waves in luminosity distance space is emerging as a promising probe of the growth of structure. just like for galaxies, its osbervation is subject to a number of relativistic corrections that affect the measured signal and need to be accounted for when fitting theoretical models to the d... | number count of gravitational waves and supernovae in luminosity distance space for lcdm and scalar-tensor theories |
we analyze hcn and hnc emission in the nearby starburst galaxy ngc 253 to investigate its effectiveness in tracing heating processes associated with star formation. this study uses multiple hcn and hnc rotational transitions observed using the atacama large millimeter/submillimeter array via the alchemi large program. ... | tracing interstellar heating: an alchemi measurement of the hcn isomers in ngc 253 |
measurements of the characteristic length scale rs of the baryon acoustic oscillations (bao) provide a robust determination of the distance-redshift relation. currently, the best (sub-per cent) estimate of rs at the drag epoch is provided by cosmic microwave background (cmb) observations assuming the validity of the st... | low-redshift estimates of the absolute scale of baryon acoustic oscillations |
collapsar disks have been proposed to be rich factories of heavy elements, but the major question of whether their outflows are neutron rich and could therefore represent significant sites of the rapid neutron-capture (r-) process or dominated by iron-group elements remains unresolved. we present the first global model... | r-process viable outflows are suppressed in global alpha-viscosity models of collapsar disks |
a dying massive star ends in a supernova explosion ejecting a large fraction of its mass into the interstellar medium. if this happens nearby, part of the ejecta might end on solar system bodies and, in fact, radioactive <mml:mmultiscripts>fe 60 </mml:mmultiscripts> has been detected on the pacific ocean fl... | interstellar <mml:mmultiscripts>fe 60 </mml:mmultiscripts> on the surface of the moon |
type ibn supernovae (sne) are a small yet intriguing class of explosions whose spectra are characterized by low-velocity helium emission lines with little to no evidence for hydrogen. the prevailing theory has been that these are the core-collapse explosions of very massive stars embedded in helium-rich circumstellar m... | type ibn supernovae show photometric homogeneity and spectral diversity at maximum light |
a detection of a core-collapse supernova (ccsn) gravitational-wave (gw) signal with an advanced ligo and virgo detector network may allow us to measure astrophysical parameters of the dying massive star. gws are emitted from deep inside the core, and, as such, they are direct probes of the ccsn explosion mechanism. in ... | inferring the core-collapse supernova explosion mechanism with gravitational waves |
we present an analysis of the early, rising light curves of 18 type ia supernovae (sne ia) discovered by the palomar transient factory and the la silla-quest variability survey. we fit these early data flux using a simple power law (f(t) = α × tn) to determine the time of first light (t0), and hence the rise time (tris... | the rising light curves of type ia supernovae |
sne ib/c mark the deaths of hydrogen-deficient massive stars. the evolutionary scenarios for sne ib/c progenitors involve many important physical processes including mass loss by winds and its metallicity dependence, stellar rotation, and binary interactions. this makes sne ib/c an excellent test bed for stellar evolut... | evolutionary models for type ib/c supernova progenitors |
this article describes the physics and nonproliferation goals of watchman, the water cherenkov monitor for antineutrinos. the baseline watchman design is a kiloton scale gadolinium-doped (gd) light water cherenkov detector, placed 13 kilometers from a civil nuclear reactor in the united states. in its first deployment ... | the physics and nuclear nonproliferation goals of watchman: a water cherenkov monitor for antineutrinos |
we present a new test of the validity of the friedmann-lemaître-robertson-walker (flrw) metric, based on comparing the distance from redshift 0 to z1 and from z1 to z2 to the distance from 0 to z2. if the universe is described by the flrw metric, the comparison provides a model-independent measurement of spatial curvat... | new test of the friedmann-lemaître-robertson-walker metric using the distance sum rule |
we present data for lsq14bdq, a hydrogen-poor super-luminous supernova (slsn) discovered by the la silla quest survey and classified by the public eso spectroscopic survey of transient objects. the spectrum and light curve are very similar to slow-declining slsne such as ptf12dam. however, detections within ∼1 day afte... | lsq14bdq: a type ic super-luminous supernova with a double-peaked light curve |
we use the bahamas (baryons and haloes of massive systems) and macsis (massive clusters and intercluster structures) hydrodynamic simulations to quantify the impact of baryons on the mass distribution and dynamics of massive galaxy clusters, as well as the bias in x-ray and weak lensing mass estimates. these simulation... | the impact of baryons on massive galaxy clusters: halo structure and cluster mass estimates |
the third-generation ground-based gravitational-wave (gw) detector, cosmic explorer (ce), is scheduled to start its observation in the 2030s. in this paper, we make a forecast for cosmological parameter estimation with gravitational-wave standard siren observation from the ce. we use the simulated gw standard siren dat... | forecast for cosmological parameter estimation with gravitational-wave standard siren observation from the cosmic explorer |
we present mass-loss predictions from monte carlo radiative transfer models for helium (he) stars as a function of stellar mass, down to 2 m⊙. our study includes both massive wolf-rayet (wr) stars and low-mass he stars that have lost their envelope through interaction with a companion. for these low-mass he stars we pr... | winds from stripped low-mass helium stars and wolf-rayet stars |
we present the discovery of 15 extremely low-mass (5\lt {log}g\lt 7) white dwarf (wd) candidates, 9 of which are in ultra-compact double-degenerate binaries. our targeted extremely low-mass survey sample now includes 76 binaries. the sample has a lognormal distribution of orbital periods with a median period of 5.4 hr.... | the elm survey. vii. orbital properties of low-mass white dwarf binaries |
neutrino fast pairwise conversions have been postulated to occur in the dense core of a core-collapse supernova (sn), possibly having dramatic consequences on the sn mechanism and the observable neutrino signal. one crucial condition favoring pairwise conversions is the presence of crossings between the electron neutri... | on the occurrence of crossings between the angular distributions of electron neutrinos and antineutrinos in the supernova core |
relativistic jets reside in high-energy astrophysical systems of all scales. their interaction with the surrounding media is critical as it determines the jet evolution, observable signature, and feedback on the environment. during its motion, the interaction of the jet with the ambient media inflates a highly pressuri... | numerically calibrated model for propagation of a relativistic unmagnetized jet in dense media |
we model the late evolution and mass loss history of rapidly rotating wolf-rayet stars in the mass range 5 m ⊙…100 m ⊙). we find that quasi-chemically homogeneously evolving single stars computed with enhanced mixing retain very little or no helium and are compatible with type ic supernovae. the more efficient removal ... | related progenitor models for long-duration gamma-ray bursts and type ic superluminous supernovae |
spectropolarimetry enables us to measure the geometry and chemical structure of the ejecta in supernova explosions, which is fundamental for the understanding of their explosion mechanism(s) and progenitor systems. we collected archival data of 35 type ia supernovae (sne ia), observed with focal reducer and low-dispers... | linear spectropolarimetry of 35 type ia supernovae with vlt/fors: an analysis of the si ii line polarization |
metallicity is one of the crucial factors that determine stellar evolution. to characterize the properties of stellar populations one needs to know the fraction of stars forming at different metallicities. knowing how this fraction evolves over time is necessary e.g. to estimate the rates of occurrence of any stellar e... | metallicity of stars formed throughout the cosmic history based on the observational properties of star-forming galaxies |
the coalescence of compact binaries containing neutron stars or black holes is one of the most promising signals for advanced ground-based laser interferometer gravitational-wave (gw) detectors, with the first direct detections expected over the next few years. the rate of binary coalescences and the distribution of co... | distinguishing compact binary population synthesis models using gravitational wave observations of coalescing binary black holes |
the high rate of star formation and supernova explosions of starburst galaxies make them interesting sources of high-energy radiation. depending on the level of turbulence present in their interstellar medium, the bulk of cosmic rays produced inside starburst galaxies may lose most of their energy before escaping, ther... | cosmic ray transport and radiative processes in nuclei of starburst galaxies |
while active galactic nuclei (agn) are considered to be key drivers of the evolution of massive galaxies, their potentially significant role in the dwarf-galaxy regime (m* < 109 m⊙) remains largely unexplored. we combine optical and infrared data, from the hyper suprime-cam (hsc) and the wide-field infrared explorer... | agn in dwarf galaxies: frequency, triggering processes and the plausibility of agn feedback |
long duration gamma-ray bursts may serve as standard candles to constrain cosmological parameters by probing the hubble diagram well beyond the range of redshift currently accessible using sne ia. the standardization of gamma-ray bursts (grbs) is based on phenomenological relations between two or more parameters found ... | spectral analysis of fermi-lat gamma-ray bursts with known redshift and their potential use as cosmological standard candles |
the detection of gravitational waves from the binary black hole (bh) merger gw150914 may enlighten our understanding of ultra-luminous x-ray sources (ulxs), as bhs of masses >30 m⊙ can reach luminosities >4 × 1039 erg s-1 without exceeding their eddington luminosities. it is then important to study variations of ... | ultra-luminous x-ray sources and neutron-star-black-hole mergers from very massive close binaries at low metallicity |
differences in the equation of state (eos) of dense matter translate into differences in astrophysical simulations and their multimessenger signatures. thus, extending the number of eoss for astrophysical simulations allows us to probe the effect of different aspects of the eos in astrophysical phenomena. in this work,... | akmal-pandharipande-ravenhall equation of state for simulations of supernovae, neutron stars, and binary mergers |
supernova generated shock waves are responsible for most of the destruction of dust grains in the interstellar medium (ism). calculations of the dust destruction timescale have so far been carried out using plane parallel steady shocks, however, that approximation breaks down when the destruction timescale becomes long... | destruction of interstellar dust in evolving supernova remnant shock waves |
we present results for the first three years of ozdes, a six year programme to obtain redshifts for objects in the dark energy survey (des) supernova fields using the 2df fibre positioner and aaomega spectrograph on the anglo-australian telescope. ozdes is a multi-object spectroscopic survey targeting multiple types of... | ozdes multifibre spectroscopy for the dark energy survey: 3-yr results and first data release |
differences in lepton number (i.e., le-lμ, le-lτ, lμ-lτ, or combinations thereof) are not conserved charges in the standard model due to the observation of neutrino oscillations. we compute the divergence of the corresponding currents in the case of majorana or dirac-type neutrinos and show that, in the high energy lim... | discovering leptonic forces using nonconserved currents |
early-time observations of type ii supernovae (sne) 2013cu and 2013fs have revealed an interaction of ejecta with material near the star surface. unlike type iin sn 2010jl, which interacts with a dense wind for 1 yr, the interaction ebbs after 2-3 d, suggesting a dense and compact circumstellar envelope. here, we use m... | explosion of red-supergiant stars: influence of the atmospheric structure on shock breakout and early-time supernova radiation |
using axisymmetric simulations coupling special relativistic magnetohydrodynamics (mhd), an approximate post-newtonian gravitational potential and two-moment neutrino transport, we show different paths for the formation of either protomagnetars or stellar mass black holes. the fraction of prototypical stellar cores whi... | protomagnetar and black hole formation in high-mass stars |
context.type ia supernovae (ia-sne) are thought to arise from the thermonuclear explosions of white dwarfs (wds). the progenitors of such explosions are still highly debated; in particular the conditions leading to detonations in wds are not well understood in most of the suggested progenitor models. nevertheless, dire... | rate of wd-wd head-on collisions in isolated triples is too low to explain standard type ia supernovae |
in this work we consider a cosmological scenario in which the universe contracts initially having a bouncing-like behavior, and accordingly after it bounces off, it decelerates following a matter dominated (md) like evolution and at very large positive times it undergoes through an accelerating stage. our aim is to stu... | from a bounce to the dark energy era with f(r) gravity |
we assemble a large set of 2-10 ghz radio flux density measurements and upper limits of 294 different supernovae (sne), from the literature and our own and archival data. only 31% of sne were detected. we characterize the sn radio lightcurves near the peak using a two-parameter model, with tpk being the time to rise to... | the radio luminosity-risetime function of core-collapse supernovae |
the standard model of cosmology, the λcdm model, describes the evolution of the universe since the big bang with just a few parameters, six in its basic form. despite being the simplest model, direct late-time measurements of the hubble constant compared with the early-universe measurements result in the so-called h0 t... | proca in the sky |
the distribution of elements produced in the innermost layers of a supernova explosion is a key diagnostic for studying the collapse of massive stars. here we present the results of a 2.4 ms nustar observing campaign aimed at studying the supernova remnant cassiopeia a (cas a). we perform spatially resolved spectroscop... | the distribution of radioactive 44ti in cassiopeia a |
measurements of the hubble constant, h0, from the cosmic distance ladder are currently in tension with the value inferred from planck observations of the cosmic microwave background (cmb) and other high-redshift data sets if a flat λ cold dark matter (λcdm) cosmological model is assumed. one of the few promising theore... | determining the hubble constant without the sound horizon scale: measurements from cmb lensing |
we construct barrow holographic dark energy in the case of non-flat universe. in particular, considering closed and open spatial geometry we extract the differential equations that determine the evolution of the dark-energy density parameter, and we provide the analytical expression for the corresponding dark energy eq... | barrow holographic dark energy in non-flat universe |
starburst galaxies, which are known as 'reservoirs' of high-energy cosmic-rays, can represent an important high-energy neutrino 'factory' contributing to the diffuse neutrino flux observed by icecube. in this paper, we revisit the constraints affecting the neutrino and gamma-ray hadronuclear emissions from this class o... | starburst galaxies strike back: a multi-messenger analysis with fermi-lat and icecube data |
context. massive stars end their lives in catastrophic supernova (sn) explosions. key information on the explosion processes and on the progenitor stars can be extracted from observations of supernova remnants (snrs), which are the outcome of sne. deciphering these observations, however, is challenging because of the c... | hydrodynamic simulations unravel the progenitor-supernova-remnant connection in sn 1987a |
we focus on viable f(t) teleparallel cosmological models, namely power law, exponential, and square-root exponential, carrying out a detailed study of their evolution at all scales. indeed, these models were extensively analysed in the light of late time measurements, while it is possible to find only upper limits look... | updating constraints on f(t) teleparallel cosmology and the consistency with big bang nucleosynthesis |
we present advances in modeling type iip supernovae (sne iip) using mesa for evolution to shock breakout coupled with stella for generating light and radial velocity curves. explosion models and synthetic light curves can be used to translate observable properties of sne (such as the luminosity at day 50 and the durati... | inferring explosion properties from type ii-plateau supernova light curves |
we compute the star-formation rate (sfr) in molecular clouds (mcs) that originate ab initio in a new, higher-resolution simulation of supernova-driven turbulence. because of the large number of well-resolved clouds with self-consistent boundary and initial conditions, we obtain a large range of cloud physical parameter... | supernova driving. iv. the star-formation rate of molecular clouds |
scipy is an open source scientific computing library for the python programming language. scipy 1.0 was released in late 2017, about 16 years after the original version 0.1 release. scipy has become a de facto standard for leveraging scientific algorithms in the python programming language, with more than 600 unique co... | scipy 1.0: fundamental algorithms for scientific computing in python |
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