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in core-collapse supernovae, the neutrino density is so large that neutrino flavor instabilities, leading to flavor conversion, can be triggered by the forward scattering of neutrinos among each other, if a crossing between the angular distributions of electron neutrino and antineutrinos exists (fast instability) or in... | do neutrinos become flavor unstable due to collisions with matter in the supernova decoupling region? |
star-forming galaxies are considered to be the leading candidate sources dominating cosmic reionization at z\gt 7: the search for analogs at moderate redshift showing lyman continuum (lyc) leakage is currently an active line of research. we have observed a star-forming galaxy at z = 3.2 with hubble/wfc3 in the f336w fi... | hubble imaging of the ionizing radiation from a star-forming galaxy at z=3.2 with fesc>50% |
the growth of a supermassive black hole (bh) is determined by how much gas the host galaxy is able to feed it, which in turn is controlled by the cosmic environment, through galaxy mergers and accretion of cosmic flows that time how galaxies obtain their gas, and also by internal processes in the galaxy, such as star f... | black hole evolution - i. supernova-regulated black hole growth |
we present six epochs of optical spectropolarimetry of the type ii supernova (sn) 2023ixf ranging from ~2 to 15 days after the explosion. polarimetry was obtained with the kast double spectrograph on the shane 3 m telescope at lick observatory, representing the earliest such observations ever captured for an sn. we obs... | early time spectropolarimetry of the aspherical type ii supernova sn 2023ixf |
the recent supernova, sn 2023ixf, one of the closest observed type ii sne has revealed the presence of a dense circumstellar material (csm). interaction of the sn ejecta with this dense csm may create high energy protons of pev energies through shock acceleration. these accelerated protons then colliding with the csm (... | new constraints on the gamma-ray and high energy neutrino fluxes from the circumstellar interaction of sn 2023ixf |
the hydrogen-rich outer layers of massive stars can be removed by interactions with a binary companion. theoretical models predict that this stripping produces a population of hot helium stars of ~2 to 8 solar masses (m☉), however, only one such system has been identified thus far. we used ultraviolet photometry to ide... | an observed population of intermediate-mass helium stars that have been stripped in binaries |
we quantify the cosmological spread of baryons relative to their initial neighboring dark matter distribution using thousands of state-of-the-art simulations from the cosmology and astrophysics with machine learning simulations (camels) project. we show that dark matter particles spread relative to their initial neighb... | cosmological baryon spread and impact on matter clustering in camels |
long-duration γ-ray bursts (grbs) accompany the collapse of massive stars and carry information about the central engine. however, no 3d models have been able to follow these jets from their birth via black hole (bh) to the photosphere. we present the first such 3d general-relativity magnetohydrodynamic simulations, wh... | black hole to photosphere: 3d grmhd simulations of collapsars reveal wobbling and hybrid composition jets |
giant molecular clouds (gmcs) and their stellar offspring are the building blocks of galaxies. the physical characteristics of gmcs and their evolution are tightly connected to galaxy evolution. the macroscopic properties of the interstellar medium propagate into the properties of gmcs condensing out of it, with correl... | the molecular cloud lifecycle |
we make a strong case that the fast neutrino-flavor conversion, one of the collective flavor oscillation modes, commonly occurs in core-collapse supernovae (ccsns). it is confirmed in the numerical data obtained in realistic simulations of ccsns, but the argument is much more generic and applicable universally: the coh... | fast neutrino-flavor conversion in the preshock region of core-collapse supernovae |
we study the cosmological constant (λ ) in the standard λ cold dark matter model by introducing the graduated dark energy (gde) characterized by a minimal dynamical deviation from the null inertial mass density of the λ in the form ρinert∝ρλ<0 with λ <1 being a ratio of two odd integers, for which its energy dens... | graduated dark energy: observational hints of a spontaneous sign switch in the cosmological constant |
supernovae (sne) embedded in dense circumstellar material (csm) may show prominent emission lines in their early-time spectra (≤10 days after the explosion), owing to recombination of the csm ionized by the shock-breakout flash. from such spectra (“flash spectroscopy”), we can measure various physical properties of the... | flash spectroscopy: emission lines from the ionized circumstellar material around <10-day-old type ii supernovae |
we present ground-based and swift photometric and spectroscopic observations of the tidal disruption event (tde) asassn-15oi, discovered at the centre of 2masx j20390918-3045201 (d ≃ 216 mpc) by the all-sky automated survey for supernovae. the source peaked at a bolometric luminosity of l ≃ 1.3 × 1044 erg s-1 and radia... | asassn-15oi: a rapidly evolving, luminous tidal disruption event at 216 mpc |
current time domain facilities are discovering hundreds of new galactic and extra-galactic transients every week. classifying the ever-increasing number of transients is challenging, yet crucial to furthering our understanding of their nature, discovering new classes, and ensuring sample purity, for instance, for super... | fully automated integral field spectrograph pipeline for the sedmachine: pysedm |
we analyse the f(r) gravity in the so-called jordan frame, as implemented to the isotropic universe dynamics. the goal of the present study is to show that according to recent data analyses of the supernovae ia pantheon sample, it is possible to account for an effective redshift dependence of the hubble constant. this ... | f(r) gravity in the jordan frame as a paradigm for the hubble tension |
we examine nucleosynthesis in the innermost neutrino-processed ejecta (a few {10}-3 {m}⊙ ) of self-consistent two-dimensional explosion models of core-collapse supernovae (ccsne) for six progenitor stars with different initial masses. three models have initial masses near the low-mass end of the sn range of 8.8 {m}⊙(e8... | nucleosynthesis in the innermost ejecta of neutrino-driven supernova explosions in two dimensions |
we use three-dimensional hydrodynamic simulations of vertically stratified patches of galactic discs to study how the spatio-temporal clustering of supernovae (sne) enhances the power of galactic winds. randomly distributed sne drive inefficient galactic winds because most supernova remnants lose their energy radiative... | clustered supernovae drive powerful galactic winds after superbubble breakout |
we present observations of ps16dtm (also known as sn 2016ezh), a luminous transient that occurred at the nucleus of a narrow-line seyfert 1 galaxy hosting a 106 m ⊙ black hole. the light curve shows that ps16dtm exhibited a plateau phase for ∼100 days, during which it showed no color evolution, maintained a blackbody t... | ps16dtm: a tidal disruption event in a narrow-line seyfert 1 galaxy |
the present work is based on a parametric reconstruction of the deceleration parameter q( z) in a model for the spatially flat frw universe filled with dark energy and non-relativistic matter. in cosmology, the parametric reconstruction technique deals with an attempt to build up a model by choosing some specific evolu... | a parametric reconstruction of the deceleration parameter |
we present the results of a search for rapidly evolving transients in the dark energy survey supernova programme. these events are characterized by fast light-curve evolution (rise to peak in ≲10 d and exponential decline in ≲30 d after peak). we discovered 72 events, including 37 transients with a spectroscopic redshi... | rapidly evolving transients in the dark energy survey |
we study the merger of binary neutron stars using different realistic, microphysical nuclear equations of state, as well as incorporating magnetic field and neutrino cooling effects. in particular, we concentrate on the influence of the equation of state on the gravitational wave signature and also on its role, in comb... | effects of the microphysical equation of state in the mergers of magnetized neutron stars with neutrino cooling |
we conduct precise strong lensing mass modeling of four hubble frontier field (hff) clusters, abell 2744, macs j0416.1-2403, macs j0717.5+3745, and macs j1149.6+2223, for which hff imaging observations are completed. we construct a refined sample of more than 100 multiple images for each cluster by taking advantage of ... | precise strong lensing mass modeling of four hubble frontier field clusters and a sample of magnified high-redshift galaxies |
we present multi-wavelength observations of sn 2014c during the first 500 days. these observations represent the first solid detection of a young extragalactic stripped-envelope sn out to high-energy x-rays ∼40 kev. sn 2014c shows ordinary explosion parameters (ek ∼ 1.8 × 1051 erg and mej ∼ 1.7 m⊙). however, over an ∼1... | ejection of the massive hydrogen-rich envelope timed with the collapse of the stripped sn 2014c |
the synthesis of nuclei in diverse cosmic scenarios is reviewed, with a summary of the basic concepts involved before a discussion of the current status in each case is made. we review the physics of the early universe, the proton to neutron ratio influence in the observed helium abundance, reaction networks, the forma... | frontiers in nuclear astrophysics |
we present ztf18abvkwla (the "koala"), a fast blue optical transient discovered in the zwicky transient facility (ztf) one-day cadence (1dc) survey. ztf18abvkwla has a number of features in common with the groundbreaking transient at 2018cow: blue colors at peak ( $g-r\approx -0.5$ mag), a short rise time from half-max... | the koala: a fast blue optical transient with luminous radio emission from a starburst dwarf galaxy at z = 0.27 |
the many unusual properties of the enigmatic at2018cow suggested that at least some subset of the empirical class of fast blue optical transients (fbots) represents a genuinely new astrophysical phenomenon. unfortunately, the intrinsic rarity and fleeting nature of these events have made it difficult to identify additi... | real-time discovery of at2020xnd: a fast, luminous ultraviolet transient with minimal radioactive ejecta |
we return to interpreting the historical sn 1987a neutrino data from a modern perspective. to this end, we construct a suite of spherically symmetric supernova models with the prometheus-vertex code, using four different equations of state and five choices of final baryonic neutron-star (ns) mass in the 1.36 - 1.93 m⊙ ... | supernova simulations confront sn 1987a neutrinos |
we examine the redshifts of a comprehensive set of published type ia supernovae, and provide a combined, improved catalogue with updated redshifts. we improve on the original catalogues by using the most up-to-date heliocentric redshift data available; ensuring all redshifts have uncertainty estimates; using the exact ... | the pantheon+ analysis: improving the redshifts and peculiar velocities of type ia supernovae used in cosmological analyses |
despite the theoretical indication that fast neutrino-flavor conversion (ffc) ubiquitously occurs iin core-collapse supernovae and binary neutron star mergers, the lack of global simulations has been the greatest obstacle to study their astrophysical consequences. in this letter, we present large-scale (50 km) simulati... | time-dependent and quasisteady features of fast neutrino-flavor conversion |
identifying the astrophysical sites of the $r$-process, one of the primary mechanisms by which heavy elements are formed, is a key goal of modern astrophysics. the discovery of the brightest gamma-ray burst of all time, grb 221009a, at a relatively nearby redshift, presented the first opportunity to spectroscopically t... | jwst observations of the extraordinary grb 221009a reveal an ordinary supernova without signs of $r$-process enrichment in a low-metallicity galaxy |
the rate of supernovae in our local galactic neighbourhood within a distance of about 100 parsecs from earth is estimated to be one every 2-4 million years, based on the total rate in the milky way (2.0 ± 0.7 per century). recent massive-star and supernova activity in earth’s vicinity may be traced by radionuclides wit... | recent near-earth supernovae probed by global deposition of interstellar radioactive 60fe |
here we analyse a particular type of f( r) gravity, the so-called exponential gravity which includes an exponential function of the ricci scalar in the action. such a term represents a correction to the usual hilbert-einstein action. by using supernovae ia, barionic acoustic oscillations, cosmic microwave background an... | is exponential gravity a viable description for the whole cosmological history? |
we explore the final fates of massive intermediate-mass stars by computing detailed stellar models from the zero-age main sequence until near the end of the thermally pulsing phase. these super-asymptotic giant branch (super-agb) and massive agb star models are in the mass range between 5.0 and 10.0 m⊙ for metallicitie... | super- and massive agb stars - iv. final fates - initial-to-final mass relation |
the dense neutrino medium in a core-collapse supernova or a neutron-star merger event can experience fast flavor conversions on time/distance scales that are much smaller than those of vacuum oscillations. it is believed that fast neutrino flavor transformation occurs in the region where the angular distributions of νe... | on the occurrence of fast neutrino flavor conversions in multidimensional supernova models |
the heliocentric redshifts (zhel) reported for 150 type ia supernovae in the pantheon compilation are significantly discrepant from their corresponding values in the jla compilation. both catalogues include corrections to the redshifts and magnitudes of the supernovae to account for the motion of the heliocentric frame... | is there really a hubble tension? |
based on recent results from three-dimensional supernova simulations and semi-analytical parametrized models, we develop analytical prescriptions for the dependence of the mass of neutron stars and black holes and the natal kicks, if any, on the pre-supernova carbon-oxygen core and helium shell masses. our recipes are ... | simple recipes for compact remnant masses and natal kicks |
recent versions of the observed cosmic star formation history (sfh) have resolved an inconsistency with the stellar mass density history. we show that the revised sfh also scales up the delay-time distribution (dtd) of type ia supernovae (sne ia), as determined from the observed volumetric sn ia rate history, aligning ... | star formation, supernovae, iron, and α: consistent cosmic and galactic histories |
flavor-dependent neutrino emission is critical to the evolution of a supernova and its neutrino signal. in the dense anisotropic interior of the star, neutrino-neutrino forward scattering can lead to fast collective neutrino oscillations, which has striking consequences. we present a theory of fast flavor depolarizatio... | fast flavor depolarization of supernova neutrinos |
we present hubble space telescope imaging of a pre-explosion counterpart to sn 2019yvr obtained 2.6 yr before its explosion as a type ib supernova (sn ib). aligning to a post-explosion gemini-s/gsaoi image, we demonstrate that there is a single source consistent with being the sn 2019yvr progenitor system, the second s... | a cool and inflated progenitor candidate for the type ib supernova 2019yvr at 2.6 yr before explosion |
we report alma band 9 continuum observations of the normal, dusty star-forming galaxy a1689-zd1 at z = 7.13, resulting in a ~4.6 σ detection at 702 ghz. for the first time, these observations probe the far-infrared spectrum shortward of the emission peak of a galaxy in the epoch of reionization (eor). together with anc... | accurate dust temperature determination in a z = 7.13 galaxy |
relativistic magnetohydrodynamics (rmhd) provides an extremely useful description of the low-energy long-wavelength phenomena in a variety of physical systems from quark–gluon plasma in heavy-ion collisions to matters in supernova, compact stars, and early universe. we review the recent theoretical progresses of rmhd, ... | new developments in relativistic magnetohydrodynamics |
the soft x-ray focusing telescope (sxt), india's first x-ray telescope based on the principle of grazing incidence, was launched aboard the astrosat and made operational on october 26, 2015. x-rays in the energy band of 0.3-8.0 kev are focussed on to a cooled charge coupled device thus providing medium resolution x-ray... | soft x-ray focusing telescope aboard astrosat: design, characteristics and performance |
next-generation surveys like the legacy survey of space and time (lsst) on the vera c. rubin observatory will generate orders of magnitude more discoveries of transients and variable stars than previous surveys. to prepare for this data deluge, we developed the photometric lsst astronomical time-series classification c... | results of the photometric lsst astronomical time-series classification challenge (plasticc) |
peculiar velocity measurements are the only tool available in the low-redshift universe for mapping the large-scale distribution of matter and can thus be used to constrain cosmology. using redshifts from the 2m++ redshift compilation, we reconstruct the density of galaxies within 200 h-1 mpc, allowing for the first ti... | cosmological parameters from the comparison of peculiar velocities with predictions from the 2m++ density field |
we perform a systematic study of merging black hole (bh) binaries with compact star (cs) companions, including black hole-white dwarf (bh-wd), black hole-neutron star (bh-ns), and black hole-black hole (bh-bh) systems. previous studies have shown that mass transfer stability and common envelope evolution can significan... | population synthesis of black hole binaries with compact star companions |
we apply the effective field theory of large-scale structure (eftoflss) to analyze cosmological models with clustering quintessence, which allows us to consistently describe the parameter region in which the quintessence equation of state $w < - 1$. first, we extend the description of biased tracers in redshift spac... | limits on clustering and smooth quintessence from the eftoflss |
we present james webb space telescope (jwst) and hubble space telescope (hst) observations of the afterglow of grb 221009a, the brightest gamma-ray burst (grb) ever observed. this includes the first mid-ir spectra of any grb, obtained with jwst/near infrared spectrograph (0.6-5.5 micron) and mid-infrared instrument (5-... | the first jwst spectrum of a grb afterglow: no bright supernova in observations of the brightest grb of all time, grb 221009a |
while conventional type ia supernova (sn ia) cosmology analyses rely primarily on rest-frame optical light curves to determine distances, sne ia are excellent standard candles in near-infrared (nir) light, which is significantly less sensitive to dust extinction. an sn ia spectral energy distribution (sed) model capabl... | a hierarchical bayesian sed model for type ia supernovae in the optical to near-infrared |
we calculate the gravitational-wave (gw) signatures of detailed three-dimensional (3d) core-collapse supernova simulations spanning a range of massive stars. most of the simulations are carried out to times late enough to capture more than 95% of the total gw emission. we find that the f /g -mode and f -mode of protone... | gravitational-wave signature of core-collapse supernovae |
we explore with self-consistent 2d f ornax simulations the dependence of the outcome of collapse on many-body corrections to neutrino-nucleon cross sections, the nucleon-nucleon bremsstrahlung rate, electron capture on heavy nuclei, pre-collapse seed perturbations, and inelastic neutrino-electron and neutrino-nucleon s... | crucial physical dependencies of the core-collapse supernova mechanism |
massive stars are important metal factories in the universe. they have short and energetic lives, and many of them inevitably explode as a supernova and become a neutron star or black hole. in turn, the formation, evolution and explosive deaths of massive stars impact the surrounding interstellar medium and shape the e... | asteroseismology of high-mass stars: new insights of stellar interiors with space telescopes |
automated photometric supernova classification has become an active area of research in recent years in light of current and upcoming imaging surveys such as the dark energy survey (des) and the large synoptic survey telescope, given that spectroscopic confirmation of type for all supernovae discovered will be impossib... | photometric supernova classification with machine learning |
we present the discovery that asassn-14ko is a periodically flaring active galactic nucleus at the center of the galaxy eso 253-g003. at the time of its discovery by the all-sky automated survey for supernovae (asas-sn), it was classified as a supernova close to the nucleus. the subsequent 6 yr of v- and g-band asas-sn... | asassn-14ko is a periodic nuclear transient in eso 253-g003 |
observations of x-ray binaries indicate a dearth of compact objects in the mass range from ∼2 − 5 m⊙. the existence of this (first mass) gap has been used to discriminate between proposed engines behind core-collapse supernovae. from ligo/virgo observations of binary compact remnant masses, several candidate first mass... | black hole-neutron star mergers: the first mass gap and kilonovae |
the kilonova (kn) associated with the binary neutron star (bns) merger gw170817 is the only known electromagnetic counterpart to a gravitational wave source. here we produce a sequence of radiative transfer models (using tardis) with updated atomic data, and compare them to accurately calibrated spectra. we use element... | modelling the spectra of the kilonova at2017gfo - i. the photospheric epochs |
natal kicks and spins are characteristic properties of neutron stars (nss) and black holes (bhs). both offer valuable clues to dynamical processes during stellar core collapse and explosion. moreover, they influence the evolution of stellar multiple systems and the gravitational-wave signals from their inspiral and mer... | supernova fallback as origin of neutron star spins and spin-kick alignment |
we present 3d simulations of the core-collapse of massive rotating and non-rotating progenitors performed with the general relativistic neutrino hydrodynamics code coconut-fmt. the progenitor models include wolf-rayet stars with initial helium star masses of $39\, \mathrm{ m}_{\odot }$ and $20\, \mathrm{ m}_{\odot }$ ,... | three-dimensional core-collapse supernova simulations of massive and rotating progenitors |
the swift-detected grb 060614 was a unique burst that straddles an imaginary divide between long- and short-duration gamma-ray bursts (grbs), and its physical origin has been heavily debated over the years. recently, a distinct, very soft f814w-band excess at t∼ 13.6 days after the burst was identified in a joint-analy... | the light curve of the macronova associated with the long-short burst grb 060614 |
superluminous supernovae (slsne) are very bright explosions that were only discovered recently and that show a preference for occurring in faint dwarf galaxies. understanding why stellar evolution yields different types of stellar explosions in these environments is fundamental in order to both uncover the elusive prog... | spectroscopy of superluminous supernova host galaxies. a preference of hydrogen-poor events for extreme emission line galaxies |
we examine the claimed excess x-ray line emission near 3.5 kev including both a new analysis of xmm-newton observations of the milky way centre and a reanalysis of the data on m 31 and clusters. in no case do we find conclusive evidence for an excess. in the case of the galactic centre, we show that known plasma lines,... | discovery of a 3.5 kev line in the galactic centre and a critical look at the origin of the line across astronomical targets |
we present gravitational wave (gw) signal predictions from four 3d multigroup neutrino hydrodynamics simulations of core-collapse supernovae of progenitors with 11.2, 20 and 27 m⊙. gw emission in the pre-explosion phase strongly depends on whether the post-shock flow is dominated by the standing accretion shock instabi... | gravitational wave signals from 3d neutrino hydrodynamics simulations of core-collapse supernovae |
we performed a detailed analysis of the detectability of a wide range of gravitational waves derived from core-collapse supernova simulations using gravitational-wave detector noise scaled to the sensitivity of the upcoming fourth and fifth observing runs of the advanced ligo, advanced virgo, and kagra. we use the cohe... | detecting and reconstructing gravitational waves from the next galactic core-collapse supernova in the advanced detector era |
neutrino flavor instabilities have the potential to shuffle neutrinos between electron, mu, and tau flavor states, possibly modifying the core-collapse supernova mechanism and the heavy elements ejected from neutron star mergers. analytic methods indicate the presence of so-called fast flavor transformation instabiliti... | neutrino fast flavor instability in three dimensions |
we review the lives, deaths and nucleosynthetic signatures of intermediate-mass stars in the range ≈6-12 m⊙, which form super-agb stars near the end of their lives. the critical mass boundaries both between different types of massive white dwarfs (co, co-ne, one), and between white dwarfs and supernovae, are examined a... | super-agb stars and their role as electron capture supernova progenitors |
this book surveys our understanding of stars which change in brightness because they pulsate. pulsating variable stars are keys to distance scales inside and beyond the milky way galaxy. they test our understanding not only of stellar pulsation theory but also of stellar structure and evolution theory. moreover, pulsat... | pulsating stars |
we currently know about 30 magnetars: seemingly isolated neutron stars whose properties can be (in part) comprehended only acknowledging that they are endowed with magnetic fields of complex morphology and exceptional intensity-at least in some components of the field structure. although magnetars represent only a smal... | magnetars: a short review and some sparse considerations |
we report on a set of long-term general-relativistic three-dimensional (3d) multi-group (energy-dependent) neutrino radiation-hydrodynamics simulations of core-collapse supernovae. we employ a full 3d two-moment scheme with the local m1 closure, three neutrino species, and 12 energy groups per species. with this, we fo... | general-relativistic three-dimensional multi-group neutrino radiation-hydrodynamics simulations of core-collapse supernovae |
understanding gravitational wave emission from core-collapse supernovae will be essential for their detection with current and future gravitational wave detectors. this requires a sample of waveforms from modern 3d supernova simulations reaching well into the explosion phase, where gravitational wave emission is expect... | gravitational wave emission from 3d explosion models of core-collapse supernovae with low and normal explosion energies |
we investigate the impact of the nonzero neutrino splitting and elastic neutrino-nucleon collisions on fast neutrino oscillations. our calculations confirm that a small neutrino mass splitting and the neutrino mass hierarchy have very little effect on fast oscillation waves. we also demonstrate explicitly that fast osc... | fast flavor oscillations in dense neutrino media with collisions |
magnetorotational supernovae are a rare type of core-collapse supernovae where the magnetic field and rotation play a central role in the dynamics of the explosion. we present the post-processed nucleosynthesis of state-of-the-art neutrino-mhd supernova models that follow the post explosion evolution for few seconds. w... | magnetorotational supernovae: a nucleosynthetic analysis of sophisticated 3d models |
we consider an axion-like particle (alp) coupled to standard model (sm) fermions as a mediator between the sm and a fermionic dark matter (dm) particle. we explore the case where the alp-sm and/or the alp-dm couplings are too small to allow for dm generation via standard freeze-out. dm is therefore thermally decoupled ... | axion-like particles as mediators for dark matter: beyond freeze-out |
new feebly interacting particles would emerge from a supernova core with 100-mev-range energies and produce γ rays by subsequent decays. these would contribute to the diffuse cosmic γ -ray background or would have shown up in the solar maximum mission satellite from sn 1987a. however, we show for the example of axionli... | axion-sourced fireballs from supernovae |
one of the active debates in core-collapse supernova (ccsn) theory is how significantly neutrino flavor conversions induced by neutrino-neutrino self-interactions change the conventional picture of ccsn dynamics. recent studies have indicated that strong flavor conversions can occur inside neutrino spheres where neutri... | basic characteristics of neutrino flavor conversions in the postshock regions of core-collapse supernova |
we present new cosmological constraints in a set of motivated extensions of the $\lambda$cdm model using the polarization and gravitational lensing measurements from the south pole telescope and the planck cmb temperature observations at large angular scales. in all cosmological scenarios, this cmb data brings the clus... | exploring ${\\lambda}$cdm extensions with spt-3g and planck data: 4$\\sigma$ evidence for neutrino masses and implications of extended dark energy models for cosmological tensions |
we investigate the constraint ability of the gravitational wave (gw) as the standard siren on the cosmological parameters by using the third-generation gravitational wave detector: the einstein telescope. the binary merger of a neutron with either a neutron or black hole is hypothesized to be the progenitor of a short ... | estimating cosmological parameters by the simulated data of gravitational waves from the einstein telescope |
the zwicky transient facility (ztf) has discovered five events (0.01 < z < 0.4) belonging to an emerging class of active galactic nuclei (agns) undergoing smooth, large-amplitude, and rapidly rising flares. this sample consists of several transients initially classified as supernovae with narrow spectral lines. h... | a family tree of optical transients from narrow-line seyfert 1 galaxies |
we develop a hybrid model of galactic chemical evolution that combines a multiring computation of chemical enrichment with a prescription for stellar migration and the vertical distribution of stellar populations informed by a cosmological hydrodynamic disc galaxy simulation. our fiducial model adopts empirically motiv... | stellar migration and chemical enrichment in the milky way disc: a hybrid model |
we study the implications of the planck temperature power spectrum at low multipoles, 0l<100, and sptpol data. we show that this combination predicts consistent lensing-induced smoothing of acoustic peaks within λcdm cosmology and yields the robust predictions of the cosmological parameters. combining only the planc... | combined analysis of planck and sptpol data favors the early dark energy models |
a dense neutrino gas, such as the one anticipated in the supernova environment, can experience fast neutrino flavor conversions on scales much shorter than those expected in vacuum probably provided that the angular distributions of νe and ν¯e cross each other. we perform a detailed investigation of the neutrino angula... | fast neutrino flavor conversion modes in multidimensional core-collapse supernova models: the role of the asymmetric neutrino distributions |
the observed tension (∼9% difference) between the local distance ladder measurement of the hubble constant, h0, and its value inferred from the cosmic microwave background could hint at new, exotic, cosmological physics. we test the impact of the assumption about the expansion history of the universe ( $0.01\lt z\lt 2.... | cosmological model insensitivity of local h0 from the cepheid distance ladder |
we present results from the semi-analytic model of galaxy formation sagapplied on the multidark simulation mdpl2. sag features an updated supernova (sn) feedback scheme and a robust modelling of the environmental effects on satellite galaxies. this incorporates a gradual starvation of the hot gas halo driven by the act... | semi-analytic galaxies - i. synthesis of environmental and star-forming regulation mechanisms |
we study diffusive shock acceleration (dsa) of protons and electrons at nonrelativistic, high mach number, quasiparallel, collisionless shocks by means of self-consistent 1d particle-in-cell simulations. for the first time, both species are found to develop power-law distributions with the universal spectral index -4 i... | simultaneous acceleration of protons and electrons at nonrelativistic quasiparallel collisionless shocks |
massive foreground galaxy clusters magnify and distort the light of objects behind them, permitting a view into both the extremely distant and intrinsically faint galaxy populations. we present here the $z\sim 6\mbox{--}8$ candidate high-redshift galaxies from the reionization lensing cluster survey (relics), a hubble ... | relics: the reionization lensing cluster survey and the brightest high-z galaxies |
we implement a multigroup and discrete-ordinate neutrino transport model in spherical symmetry which allows to simulate collective neutrino oscillations by including realistic collisional rates in a self-consistent way. we utilize this innovative model, based on strategic parameter rescaling, to study a recently propos... | evolution of collisional neutrino flavor instabilities in spherically symmetric supernova models |
we present extensive optical photometry of the afterglow of grb 221009a. our data cover 0.9-59.9 days from the time of swift and fermi gamma-ray burst (grb) detections. photometry in rizy-band filters was collected primarily with pan-starrs and supplemented by multiple 1-4 m imaging facilities. we analyzed the swift x-... | the optical light curve of grb 221009a: the afterglow and the emerging supernova |
we examine the formation of dark matter (dm) cores in dwarf galaxies simulated with the eagle model of galaxy formation. as in earlier work, we find that the star formation (sf) gas density threshold (ρth) plays a critical role. at low thresholds (lt), gas is unable to reach densities high enough to dominate the gravit... | baryon-induced dark matter cores in the eagle simulations |
we present detailed submillimeter- through centimeter-wave observations of the extraordinary extragalactic transient at2018cow. the apparent characteristics—the high radio luminosity, the rise and long-lived emission plateau at millimeter bands, and the sub-relativistic velocity—have no precedent. a basic interpretatio... | at2018cow: a luminous millimeter transient |
we study the effects of cosmic rays (crs) on outflows from star-forming galaxies in the circum and intergalactic medium (cgm/igm), in high-resolution, fully cosmological fire-2 simulations (accounting for mechanical and radiative stellar feedback, magnetic fields, anisotropic conduction/viscosity/cr diffusion and strea... | cosmic ray driven outflows to mpc scales from l* galaxies |
we present an analysis of the quenching of star formation in galaxies, bulges, and disks throughout the bulk of cosmic history, from z = 2 − 0. we utilise observations from the sloan digital sky survey and the mapping nearby galaxies at apache point observatory survey at low redshifts. we complement these data with obs... | the quenching of galaxies, bulges, and disks since cosmic noon. a machine learning approach for identifying causality in astronomical data |
we have performed a multiwavelength study of supernova remnant (snr) g57.2+0.8 and its environment. the snr hosts the magnetar sgr 1935+2154, which emitted an extremely bright millisecond-duration radio burst on 2020 april 28. we used the 12co and 13co j = 1-0 data from the milky way image scroll painting co line surve... | revisiting the distance, environment, and supernova properties of snr g57.2+0.8 that hosts sgr 1935+2154 |
the discrepancy between the values of the hubble constant h0 derived from the local distance ladder and the cosmic microwave background provides a tantalizing hint of new physics. we explore a potential resolution involving screened fifth forces in the local universe, which alter the cepheid calibration of supernova di... | local resolution of the hubble tension: the impact of screened fifth forces on the cosmic distance ladder |
we place observational constraints on the galileon ghost condensate model, a dark energy proposal in cubic-order horndeski theories consistent with the gravitational-wave event gw170817. the model extends the covariant galileon by taking an additional higher-order field derivative x2 into account. this allows for the d... | cosmological data favor galileon ghost condensate over λ cdm |
we present very early, high-cadence photometric observations of the nearby type ia sn 2017cbv. the light curve is unique in that it has a blue bump during the first five days of observations in the u, b, and g bands, which is clearly resolved given our photometric cadence of 5.7 hr during that time span. we model the l... | early blue excess from the type ia supernova 2017cbv and implications for its progenitor |
this paper introduces a new approach to reconstruct cosmological functions using artificial neural networks based on observational measurements with minimal theoretical and statistical assumptions. by using neural networks, we can generate computational models of observational datasets, and then we compare them with th... | neural network reconstructions for the hubble parameter, growth rate and distance modulus |
most massive stars, the progenitors of core-collapse supernovae, are in close binary systems and may interact with their companion through mass transfer or merging. we undertake a population synthesis study to compute the delay-time distribution of core-collapse supernovae, that is, the supernova rate versus time follo... | delay-time distribution of core-collapse supernovae with late events resulting from binary interaction |
we present the gravitational waveforms computed in ab initio two-dimensional core collapse supernova models evolved with the chimera code for progenitor masses between 12 and 25 m⊙ . all models employ multifrequency neutrino transport in the ray-by-ray approximation, state-of-the-art weak interaction physics, relativis... | gravitational wave signatures of ab initio two-dimensional core collapse supernova explosion models for 12 -25 m⊙ stars |
the hot (>106 k) phase of the circumgalactic medium (cgm) contains a large fraction of baryons in galaxies. it also retains signatures of the processes that shaped the galaxies, such as feedback from active galactic nuclei and supernovae, and offers a uniquely powerful way to constrain theoretical models of feedback... | testing galaxy feedback models with resolved x-ray profiles of the hot circumgalactic medium |
determining the differential-rotation law of compact stellar objects produced in binary neutron stars mergers or core-collapse supernovae is an old problem in relativistic astrophysics. addressing this problem is important because it impacts directly on the maximum mass these objects can attain and, hence, on the thres... | rotational properties of hypermassive neutron stars from binary mergers |
the combination of multiple observational probes has long been advocated as a powerful technique to constrain cosmological parameters, in particular dark energy. the dark energy survey has measured 207 spectroscopically confirmed type ia supernova light curves, the baryon acoustic oscillation feature, weak gravitationa... | cosmological constraints from multiple probes in the dark energy survey |
the hypothetical massive dark photon (γ‧) which has kinetic mixing with the sm photon can decay electromagnetically to e+e- pairs if its mass m exceeds 2me, and otherwise into three sm photons. these decays yield cosmological and supernovae associated signatures. we briefly discuss these signatures, particularly in con... | supernova bounds on the dark photon using its electromagnetic decay |
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