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we report a spectroscopic search for hypervelocity white dwarfs (wds) that are runaways from type ia supernovae (sne ia) and related thermonuclear explosions. candidates are selected from gaia data with high tangential velocities and blue colors. we find six new runaways, including four stars with radial velocities (rv... | the fastest stars in the galaxy |
the vera c. rubin legacy survey of space and time (lsst) holds the potential to revolutionize time domain astrophysics, reaching completely unexplored areas of the universe and mapping variability time scales from minutes to a decade. to prepare to maximize the potential of the rubin lsst data for the exploration of th... | rubin observatory lsst transients and variable stars roadmap |
in the next decades, the gravitational-wave (gw) standard siren observations and the neutral hydrogen 21-cm intensity mapping (im) surveys, as two promising cosmological probes, will play an important role in precisely measuring cosmological parameters. in this work, we make a forecast for cosmological parameter estima... | how can gravitational-wave standard sirens and 21-cm intensity mapping jointly provide a precise late-universe cosmological probe? |
we construct a sample of 644 carbon-enhanced metal-poor (cemp) stars with abundance analyses based on moderate- to high-resolution spectroscopic studies. dynamical parameters for these stars are estimated based on radial velocities, bayesian parallax-based distance estimates, and proper motions from gaia edr3 and dr3, ... | chemodynamically tagged groups of cemp stars in the halo of the milky way. i. untangling the origins of cemp-s and cemp-no stars |
stellar models predict that lithium (li) inside a star is destroyed during the first dredge-up phase, yet 1.2% of red giant stars are li-rich. we aim to uncover possible origins of this population, by analysing 1155 li-rich giants (a(li) $\geq$ 1.5) in galah dr3. to expose peculiar traits of li-rich stars, we construct... | many roads lead to lithium: formation pathways for lithium-rich red giants |
supernova (sn) 2023ixf was discovered by k. itagaki in the very nearby galaxy (d=6.4 mpc; shappee & stanek 2011, apj, 733, 124) messier 101 (m101; ngc 5457) on 05/19/2023 and has been classified as a type ii sn by perley et al. (astronote 2023-119). | spitzer constraints on pre-explosion variability of the sn 2023ixf progenitor |
in this study, the cztsse (cu2znsn(s,se)4) solar cells, with al/zno:al/zno (i)/cds/cztsse/mo structure, have been simulated. the simulation results have been compared and validated with real experimental results. next, suggestions for improving the performance of cztsse solar cell have been provided. a sns layer has be... | improve the performance of cztsse solar cells by applying a sns bsf layer |
we present the holismokes programme on strong gravitational lensing of supernovae (sne) as a probe of sn physics and cosmology. we investigate the effects of microlensing on early-phase sn ia spectra using four different sn explosion models. we find that distortions of sn ia spectra due to microlensing are typically ne... | holismokes. i. highly optimised lensing investigations of supernovae, microlensing objects, and kinematics of ellipticals and spirals |
while the evolution of superbubbles driven by clustered supernovae has been studied by numerous authors, the resulting radial momentum yield is uncertain by as much as an order of magnitude depending on the computational methods and assumed properties of the surrounding interstellar medium (ism). in this work, we study... | the momentum budget of clustered supernova feedback in a 3d, magnetized medium |
extended material at large radii surrounding a supernova (sn) can result in a double-peaked light curve. this occurs when the material is sufficiently massive that the sn shock continues to propagate into it and sufficiently extended that it produces a bright first peak. such material can be the leftover, low-mass enve... | using double-peaked supernova light curves to study extended material |
context. elements heavier than li are produced in the interiors of stars. however, for many elements the exact production sites and the timescales on which they are dispersed into the interstellar medium are unknown. having a clear picture on the origins of the elements is important for our ability to trace and underst... | the origin and evolution of the odd-z iron-peak elements sc, v, mn, and co in the milky way stellar disk |
in binary black hole mergers from isolated binary-star evolution, both black holes are from progenitor stars that have lost their hydrogen-rich envelopes by binary mass transfer. envelope stripping is known to affect the pre-supernova core structures of such binary-stripped stars and thereby their final fates and compa... | bimodal black hole mass distribution and chirp masses of binary black hole mergers |
mev-scale energy depositions by low-energy photons produced in neutrino-argon interactions have been identified and reconstructed in argoneut liquid argon time projection chamber (lartpc) data. argoneut data collected on the numi beam at fermilab were analyzed to select isolated low-energy depositions in the tpc volume... | demonstration of mev-scale physics in liquid argon time projection chambers using argoneut |
the universe is awash with tens-of-mev neutrinos of all species coming from all past core-collapse supernovae. these have never been observed, but this state of affairs will change in the near future. in less than ten years, the super-kamiokande experiment, loaded with gadolinium, is expected to collect dozens of event... | fundamental physics with the diffuse supernova background neutrinos |
we study theoretical neutrino signals from core-collapse supernova (ccsn) computed using axisymmetric ccsn simulations that cover the post-bounce phase up to ~4 s. we provide basic quantities of the neutrino signals such as event rates, energy spectra, and cumulative number of events at some terrestrial neutrino detect... | supernova neutrino signals based on long-term axisymmetric simulations |
in late 2014, four images of supernova (sn) "refsdal," the first known example of a strongly lensed sn with multiple resolved images, were detected in the macs j1149 galaxy-cluster field. following the images' discovery, the sn was predicted to reappear within hundreds of days at a new position ~8″ away in the field. t... | the magnificent five images of supernova refsdal: time delay and magnification measurements |
low-redshift measurements of baryon acoustic oscillations (bao) measure the late-time evolution of the universe and are a vital probe of dark energy. over the past decade both the 6-degree field galaxy survey (6dfgs) and sloan digital sky survey main galaxy sample (sdss mgs) have provided important distance constraints... | low redshift baryon acoustic oscillation measurement from the reconstructed 6-degree field galaxy survey |
fallback in core-collapse supernovae plays a crucial role in determining the properties of the compact remnants and of the ejecta composition. we perform three-dimensional simulations of mixing and fallback for selected non-rotating supernova models to study how explosion energy and asymmetries correlate with the remna... | the impact of fallback on the compact remnants and chemical yields of core-collapse supernovae |
recent arcsecond localizations of fast radio bursts and identifications of their host galaxies confirmed their extragalactic origin. while frb 121102 resides in the bright region of a dwarf star-forming galaxy, other frbs reside in more massive galaxies and are related to older stellar populations. we compare the host ... | a comparative study of host galaxy properties between fast radio bursts and stellar transients |
we explore the variation in single-star 15-30 {m}⊙ , nonrotating, solar metallicity, pre-supernova mesa models that is due to changes in the number of isotopes in a fully coupled nuclear reaction network and adjustments in the mass resolution. within this two-dimensional plane, we quantitatively detail the range of cor... | on variations of pre-supernova model properties |
the empirical upper luminosity boundary lmax of cool supergiants (sgs), often referred to as the humphreys-davidson limit, is thought to encode information on the general mass-loss behaviour of massive stars. further, it delineates the boundary at which single stars will end their lives stripped of their hydrogen-rich ... | the luminosities of cool supergiants in the magellanic clouds, and the humphreys-davidson limit revisited |
we show how the interplay between active galactic nuclei (agns) and merger history determines whether a galaxy quenches star formation (sf) at high redshift. we first simulate, in a full cosmological context, a galaxy of total dynamical mass mvir = 1012 m⊙ at z = 2. then we systematically alter the accretion history of... | how to quench a galaxy |
the effects of rotation on stellar evolution are particularly important at low metallicity, when mass loss by stellar winds diminishes and the surface enrichment due to rotational mixing becomes relatively more pronounced than at high metallicities. here we investigate the impact of rotation and metallicity on stellar ... | grids of stellar models with rotation. iv. models from 1.7 to 120 m⊙ at a metallicity z = 0.0004 |
we present a sample of type icn supernovae (sne icn), a newly discovered class of transients characterized by their interaction with h- and he-poor circumstellar material (csm). this sample is the largest collection of sne icn to date and includes observations of two published objects (sn 2019hgp and sn 2021csp) and tw... | the diverse properties of type icn supernovae point to multiple progenitor channels |
we reanalyse observations of type ia supernovae (sne) and cepheids used in the local determination of the hubble constant and find strong evidence that sn standardization in the calibration sample (galaxies with observed cepheids) requires a steeper slope of the colour correction than in the cosmological sample (galaxi... | intrinsic tension in the supernova sector of the local hubble constant measurement and its implications |
we study star cluster formation at low metallicities of z/z⊙ = 10-4-10-1 using three-dimensional hydrodynamics simulations. particular emphasis is put on how the stellar mass distribution is affected by the cosmic microwave background radiation (cmb), which sets the temperature floor to the gas. starting from the colla... | impact of the cosmic background radiation on the initial mass function of metal-poor stars |
common envelope evolution is a fundamental ingredient in our understanding of the formation of close binary stars containing compact objects that include the progenitors of type ia supernovae, short gamma-ray bursts, and most stellar gravitational wave sources. to predict the outcome of common envelope evolution, we st... | close detached white dwarf + brown dwarf binaries: further evidence for low values of the common envelope efficiency |
the accuracy of einstein's equivalence principle (eep) can be tested with the observed time delays between correlated particles or photons that are emitted from astronomical sources. assuming as a lower limit that the time delays are caused mainly by the gravitational potential of the milky way, we prove that fast radi... | testing einstein's equivalence principle with fast radio bursts |
we report the results of our observing campaign on grb 140903a, a nearby (z = 0.351) short-duration (t 90 ∼ 0.3 s) gamma-ray burst discovered by swift. we monitored the x-ray afterglow with chandra up to 15 days after the burst and detected a steeper decay of the x-ray flux after tj≈ 1 day. continued monitoring at opti... | an achromatic break in the afterglow of the short grb 140903a: evidence for a narrow jet |
we study how star formation is regulated in low-mass field dwarf galaxies ( $10^5 \le m_{\star } \le 10^6 \, \mbox{m}_\mathrm{\odot }$ ), using cosmological high-resolution ( $3 \, \mathrm{pc}$ ) hydrodynamical simulations. cosmic reionization quenches star formation in all our simulated dwarfs, but three galaxies with... | edge: from quiescent to gas-rich to star-forming low-mass dwarf galaxies |
gravitational wave observations can be used to accurately measure the hubble constant $h_0$ and could help understand the present discrepancy between constraints from type ia supernovae and the cosmic microwave background. neutron star mergers are primarily used for this purpose as their electromagnetic emission can be... | hubble constant measurement with gw190521 as an eccentric black hole merger |
four decades ago, the firm detection of an fe-k emission feature in the x-ray spectrum of the perseus cluster revealed the presence of iron in its hot intracluster medium (icm). with more advanced missions successfully launched over the last 20 years, this discovery has been extended to many other metals and to the hot... | enrichment of the hot intracluster medium: observations |
core-collapse supernova (sn) explosions expose the structure and environment of massive stars at the moment of their death. we use the global fitting technique of pejcha & prieto to estimate a set of physical parameters of 19 normal sne ii, such as their distance moduli, reddenings, 56ni masses {m}{ni}, and explosi... | the nickel mass distribution of normal type ii supernovae |
we investigate axisymmetric black hole (bh) formation and its gravitational wave (gw) and neutrino signals with self-consistent core-collapse supernova simulations of a non-rotating 40 m ⊙ progenitor star using the isotropic diffusion source approximation for the neutrino transport and a modified gravitational potentia... | equation of state dependent dynamics and multi-messenger signals from stellar-mass black hole formation |
we present a simple model for the response of a dissipationless spherical system to an instantaneous mass change at its centre, describing the formation of flat cores in dark matter haloes and ultra-diffuse galaxies (udgs) from feedback-driven outflow episodes in a specific mass range. this model generalizes an earlier... | a model for core formation in dark matter haloes and ultra-diffuse galaxies by outflow episodes |
we study the growth of the explosion energy after shock revival in neutrino-driven explosions in two and three dimensions (2d/3d) using multi-group neutrino hydrodynamics simulations of an 11.2 m⊙ star. the 3d model shows a faster and steadier growth of the explosion energy and already shows signs of subsiding accretio... | the dynamics of neutrino-driven supernova explosions after shock revival in 2d and 3d |
we apply gaussian processes (gp) in order to impose constraints on teleparallel gravity and its f(t) extensions. we use available h(z) observations from (i) cosmic chronometers data (cc); (ii) supernova type ia (sn) data from the compressed pantheon release together with the candels and clash multi-cycle treasury progr... | constraining teleparallel gravity through gaussian processes |
we present three-dimensional radiation-hydrodynamical simulations of the impact of stellar winds, photoelectric heating, photodissociating and photoionizing radiation, and supernovae on the chemical composition and star formation in a stratified disc model. this is followed by a sink-based model for star clusters with ... | the silcc project - iv. impact of dissociating and ionizing radiation on the interstellar medium and hα emission as a tracer of the star formation rate |
carbon and oxygen burning reactions, in particular, c 12 +c 12 fusion, are important for the understanding and interpretation of the late phases of stellar evolution as well as the ignition and nucleosynthesis in cataclysmic binary systems such as type ia supernovae and x-ray superbursts. a new measurement of this reac... | new measurement of c 12 +c 12 fusion reaction at astrophysical energies |
recent studies on direct imaging of type ii core-collapse supernova progenitors indicate a possible threshold around mzams ∼ 16-20 m⊙, where red supergiants (rsg) with larger birth masses do not appear to result in supernova explosions and instead implode directly into a black hole. in this study, we argue that it is n... | missing red supergiants and carbon burning |
the final collapse of the cores of massive stars can lead to a wide variety of outcomes in terms of electromagnetic and kinetic energies, nucleosynthesis, and remnants. the association of this wide spectrum of explosion and remnant types with the properties of the progenitors remains an open issue. the rotation and mag... | magnetorotational core collapse of possible gamma-ray burst progenitors - iv. a wider range of progenitors |
in the context of a ghost free f(r , g) model, we present a non-singular cosmological scenario in which the universe initially contracts through an ekpyrotic phase having a bouncing like behaviour, and following the bounce, it smoothly transits to a matter or radiation like deceleration era which is further smoothly co... | towards a smooth unification from an ekpyrotic bounce to the dark energy era |
binary population synthesis (bps) employs prescriptions to predict final fates, explosion or implosion, and remnant masses based on one or two stellar parameters at the evolutionary cutoff imposed by the code, usually at or near central carbon ignition. in doing this, bps disregards the integral role late-stage evoluti... | comparing compact object distributions from mass- and presupernova core structure-based prescriptions |
self-interacting dark matter provides a promising alternative for the cold dark matter paradigm to solve potential small-scale galaxy formation problems. nearly all self-interacting dark matter simulations so far have considered only elastic collisions. here we present simulations of a galactic halo within a generic in... | evaporating the milky way halo and its satellites with inelastic self-interacting dark matter |
the surprising jwst discovery of a quiescent, low-mass (m ⋆ = 108.7 m ⊙) galaxy at redshift z = 7.3 (jades-gs-z7-01-qu) represents a unique opportunity to study the imprint of feedback processes on early galaxy evolution. we build a sample of 130 low-mass (m ⋆ ≲ 109.5 m ⊙) galaxies from the serra cosmological zoom-in s... | quiescent low-mass galaxies observed by jwst in the epoch of reionization |
during the zwicky transient facility (ztf) phase i operations, 78 hydrogen-poor superluminous supernovae (slsne-i) were discovered in less than 3 yr, constituting the largest sample from a single survey. this paper (paper i) presents the data, including the optical/uv light curves and classification spectra, while pape... | the hydrogen-poor superluminous supernovae from the zwicky transient facility phase i survey. i. light curves and measurements |
mapping cosmic dawn with 21-cm tomography offers an exciting new window into the era of primordial star formation. however, self-consistent implementation of both the process of star formation and the related 21-cm signal is challenging, due to the multiscale nature of the problem. in this study, we develop a flexible ... | effect of the cosmological transition to metal-enriched star formation on the hydrogen 21-cm signal |
new particles coupled to the standard model can equilibrate in stellar cores if they are sufficiently heavy and strongly coupled. in this work, we investigate the astrophysical consequences of such a scenario for massive stars by incorporating new contributions to the equation of state into a state of the art stellar s... | axion instability supernovae |
understanding the astrophysical phenomena involving compact objects requires an insight about the engine behind the core-collapse supernovae (sne) and the fate of the stellar collapse of massive stars. in particular, this insight is crucial in developing an understanding of the origin and formation channels of the grow... | the role of supernova convection for the lower mass gap in the isolated binary formation of gravitational wave sources |
the supernova (sn) ptf11iqb was initially classified as a type iin event caught very early after explosion. it showed narrow wolf-rayet (wr) spectral features on day 2 (as in sn 1998s and sn 2013cu), but the narrow emission weakened quickly and the spectrum morphed to resemble types ii-l and ii-p. at late times, hα exh... | ptf11iqb: cool supergiant mass-loss that bridges the gap between type iin and normal supernovae |
the present study reveals observational constraints on the coupling between dark components of anisotropic bianchi type i universe. we assume interaction between dark matter and dark energy and split the continuity equation with inclusion of interaction term $\gamma$. two scenarios have been considered (i) when couplin... | interacting dark sectors in anisotropic universe: observational constraints and $h_{0}$ tension |
china jinping underground laboratory (cjpl) is ideal for studying solar, geo-, and supernova neutrinos. a precise measurement of the cosmic-ray background is essential in proceeding with r&d research for these mev-scale neutrino experiments. using a 1-ton prototype detector for the jinping neutrino experiment (jne)... | muon flux measurement at china jinping underground laboratory |
efficient thermalization of overlapping supernovae within star-forming galaxies may produce a supernova-heated fluid that drives galactic winds. for fiducial assumptions about the time-scale for cloud shredding from high-resolution simulations (which neglect magnetic fields), we show that cool clouds with temperature f... | entrainment in trouble: cool cloud acceleration and destruction in hot supernova-driven galactic winds |
we study the final fate of a very massive star by performing full general relativistic (gr), three-dimensional (3d) simulation with three-flavour multi-energy neutrino transport. utilizing a 70 solar mass zero-metallicity progenitor, we self-consistently follow the radiation-hydrodynamics from the onset of gravitationa... | a full general relativistic neutrino radiation-hydrodynamics simulation of a collapsing very massive star and the formation of a black hole |
the current hubble constant tension is usually presented by comparing constraints on h0 only. however, the postrecombination background cosmic evolution is determined by two parameters in the standard λcdm model, the hubble constant (h0) and today's matter energy fraction (ωm). if we therefore compare all constraints i... | investigating the hubble constant tension: two numbers in the standard cosmological model |
among the milky way satellites discovered in the past three years, triangulum ii has presented the most difficulty in revealing its dynamical status. kirby et al. identified it as the most dark-matter-dominated galaxy known, with a mass-to-light ratio within the half-light radius of {3600}-2100+3500 {m}⊙{l}⊙ -1. on the... | triangulum ii. not especially dense after all |
gravitational-wave (gw) catalogs are rapidly increasing in number, allowing for statistical analyses of the population of compact binaries. nonetheless, gw inference of cosmology has typically relied on additional electromagnetic counterparts or galaxy catalogs. i present a new probe of cosmological modifications of ge... | hearing gravity from the cosmos: gwtc-2 probes general relativity at cosmological scales |
simulations of type ia supernovae (sne ia) surveys are a critical tool for correcting biases in the analysis of sne ia to infer cosmological parameters. large-scale monte carlo simulations include a thorough treatment of observation history, measurement noise, intrinsic scatter models, and selection effects. in this le... | measuring type ia supernova populations of stretch and color and predicting distance biases |
aims: we perform a comprehensive study of the total mass distribution of the galaxy cluster rxc j2248.7-4431 (z = 0.348) with a set of high-precision strong lensing models, which take advantage of extensive spectroscopic information on many multiply lensed systems. in the effort to understand and quantify inherent syst... | clash-vlt: a highly precise strong lensing model of the galaxy cluster rxc j2248.7-4431 (abell s1063) and prospects for cosmography |
we present a broadband spectrum of gravitational waves (gws) from core-collapse supernovae (ccsne) sourced by neutrino emission asymmetries for a series of full 3d simulations. the associated gw strain probes the long-term secular evolution of ccsne and small-scale turbulent activity and provides insight into the geome... | gravitational waves from neutrino emission asymmetries in core-collapse supernovae |
we apply deep recurrent neural networks, which are capable of learning complex sequential information, to classify supernovae (code available at https://github.com/adammoss/supernovae). the observational time and filter fluxes are used as inputs to the network, but since the inputs are agnostic, additional data such as... | deep recurrent neural networks for supernovae classification |
milky way (mw) satellites reside within dark matter (dm) subhalos with a broad distribution of circular velocity profiles. this diversity is enhanced with the inclusion of ultrafaint satellites, which seemingly have very high dm densities, albeit with large systematic uncertainties. we argue that if confirmed, this lar... | diverse dark matter density at sub-kiloparsec scales in milky way satellites: implications for the nature of dark matter |
in this work, we use an observational approach and dynamical system analysis to study the cosmological model recently proposed by saridakis (2020), which is based on the modification of the entropy-area black hole relation proposed by barrow (2020). the friedmann equations governing the dynamics of the universe under t... | barrow entropy cosmology: an observational approach with a hint of stability analysis |
axionlike particles (alps) coupled with electrons would be produced in a supernova (sn) via electron-proton bremsstrahlung and electron-positron fusion. we evaluate the alp emissivity from these processes by taking into account the alp mass and thermal effects on electrons in the strongly degenerate and relativistic sn... | supernova bound on axionlike particles coupled with electrons |
the cosmographic approach, a taylor expansion of the hubble function, has been used as a model-independent method to investigate the evolution of the universe in the presence of cosmological data. apart from possible technical problems like the radius of convergence, there is an ongoing debate about the tensions that a... | cosmographic parameters in model-independent approaches |
we present three-dimensional simulations of core-collapse supernovae using the flash code that follow the progression of the explosion to the stellar surface, starting from neutrino radiation hydrodynamic simulations of the neutrino-driven phase performed with the chimera code. we consider a 9.6 m⊙ zero-metallicity pro... | three-dimensional core-collapse supernova simulations with 160 isotopic species evolved to shock breakout |
stellar candidates in the ursa minor (umi) dwarf galaxy have been found using a new bayesian algorithm applied to gaia edr3 data. five of these targets are located in the extreme outskirts of umi, from ~5 to 12 elliptical half-light radii (rh), where rh(umi) = 17.32 ± 0.11 arcmin, and have been observed with the high-r... | the extended 'stellar halo' of the ursa minor dwarf galaxy |
we analyze the simulation of dirac neutrino oscillations using quantum walks, both in a vacuum and in matter. we show that this simulation, in the continuum limit, reproduces a set of coupled dirac equations that describe neutrino flavor oscillations, and we make use of this to establish a connection with neutrino phen... | quantum walks as simulators of neutrino oscillations in a vacuum and matter |
if the thermal evolution of the hot young neutron star in the supernova remnant hess j1731-347 is driven by neutrino emission, it provides a stringent constraint on the coupling of light (mass ≪10 kev ) axion-like particles to neutrons. using markov-chain monte carlo we find that for the values of axion-neutron couplin... | constraints on axion-like particles and nucleon pairing in dense matter from the hot neutron star in hess j1731-347 |
in this research, we construct kaniadakis holographic dark energy (khde) model within a nonflat universe by considering the friedmann-robertson-walker (frw) metric with open and closed spatial geometries. the kaniadakis entropy is indeed a one-parameter generalization of the classical boltzmann-gibbs-shannon entropy wh... | kaniadakis holographic dark energy in nonflat universe |
we examine the physical basis for algorithms to replace mixing-length theory (mlt) in stellar evolutionary computations. our 321d procedure is based on numerical solutions of the navier-stokes equations. these implicit large eddy simulations (iles) are three-dimensional (3d), time-dependent, and turbulent, including th... | beyond mixing-length theory: a step toward 321d |
neutrinos emitted from a supernova may undergo flavor conversions almost immediately above the core, with possible consequences for supernova dynamics and nucleosynthesis. however, the precise conditions for such fast conversions can be difficult to compute and require knowledge of the full angular distribution of the ... | simple method of diagnosing fast flavor conversions of supernova neutrinos |
scalar fields aptly describe equation of state of dark energy. the scalar field models were initially proposed to circumvent the fine tuning problem of cosmological constant. however, the model parameters also need a fine tuning of their own and it is important to use different observations to determine these parameter... | observational constraints on quintessence models of dark energy |
we propose a common envelope jets supernova (cejsn) scenario for the fast-rising blue optical transient at2018cow. in a cejsn, a neutron star (ns) spirals-in inside the extended envelope of a massive giant star and enters the core. the ns accretes mass from the core through an accretion disc and launches jets. these je... | diversity of common envelope jets supernovae and the fast transient at2018cow |
galactic winds from star-forming galaxies are crucial to the process of galaxy formation and evolution, regulating star formation, shaping the stellar mass function and the mass-metallicity relation, and enriching the intergalactic medium with metals. galactic winds associated with stellar feedback may be driven by ove... | a review of the theory of galactic winds driven by stellar feedback |
during the first several days after explosion, type ia supernova light curves probe the outer layers of the exploding star, and therefore provide important clues for identifying their progenitors. we investigate how both the shallow 56ni distribution and the presence of circumstellar material shape these early light cu... | exploring the potential diversity of early type ia supernova light curves |
i review the physics of the diffuse supernova neutrino flux (or background, dsnb), in the context of future searches at the next generation of neutrino observatories. the theory of the dsnb is discussed in its fundamental elements, namely the cosmological rate of supernovae, neutrino production inside a core collapse s... | diffuse supernova neutrinos at underground laboratories |
it is difficult to establish the properties of massive stars that explode as supernovae. the electromagnetic emission during the first minutes to hours after the emergence of the shock from the stellar surface conveys important information about the final evolution and structure of the exploding star. however, the unpr... | a surge of light at the birth of a supernova |
neutrino flavor transformations in core-collapse supernovae and binary neutron star mergers represent a complex and unsolved problem that is integral to our understanding of the dynamics and nucleosynthesis in these environments. the high number densities of neutrinos present in these environments can engender various ... | many-body collective neutrino oscillations: recent developments |
young neutron stars (nss) born in core-collapse explosions are promising candidates for the central engines of fast radio bursts (frbs), since the first localized repeating burst frb 121102 occurs in a star-forming dwarf galaxy similar to the host galaxies of superluminous supernovae and long gamma-ray bursts. however,... | fast radio bursts from activity of neutron stars newborn in bns mergers: offset, birth rate, and observational properties |
we present magnetohydrodynamic (mhd) simulations of the star-forming multiphase interstellar medium (ism) in stratified galactic patches with gas surface densities σgas = 10, 30, 50, and 100 $\mathrm{m_\odot \, pc^{-2}}$. the silcc project simulation framework accounts for non-equilibrium thermal and chemical processes... | silcc - vii. gas kinematics and multiphase outflows of the simulated ism at high gas surface densities |
we present the detection of very-high-energy gamma-ray emission above 100 tev from hawc j2227+610 with the high-altitude water cherenov gamma-ray observatory (hawc) observatory. combining our observations with previously published results by the very energetic radiation imaging telescope array system (vertias), we inte... | hawc j2227+610 and its association with g106.3+2.7, a new potential galactic pevatron |
solar neutrinos upscattering inside the earth can source unstable particles that subsequently decay inside large volume detectors (e.g., neutrino experiments). contrary to naive expectations, when the decay length is much shorter than the radius of the earth (rather than the length of the detector), the event rate is i... | luminous solar neutrinos. i. dipole portals |
dark energy could play a role at redshifts z ≫o (1 ). many quintessence models possess scaling or attractor solutions where the fraction of dark energy follows the dominant component in previous epochs of the universe's expansion, or phase transitions may happen close to the time of matter-radiation equality. a non-neg... | early dark energy in the pre- and postrecombination epochs |
gamma-ray bursts are the most powerful explosions in the universe and are mainly placed at very large redshifts, up to z≃9. in this short review, we first discuss gamma-ray burst classification and morphological properties. we then report the likely relations between gamma-ray bursts and other astronomical objects, suc... | a roadmap to gamma-ray bursts: new developments and applications to cosmology |
we study the impact of neutrino magnetic moments on astrophysical neutrinos, in particular supernova neutrinos and ultra-high energy neutrinos from extragalactic sources. we show that magnetic moment-induced conversion of left-handed neutrinos into unobservable right-handed singlet states can substantially change the f... | magnetic moments of astrophysical neutrinos |
supernovae ia are bright explosive events that can be used to estimate cosmological distances, allowing us to study the expansion of the universe. they are understood to result from a thermonuclear detonation in a white dwarf that formed from the exhausted core of a star more massive than the sun. however, the possible... | a hot subdwarf-white dwarf super-chandrasekhar candidate supernova ia progenitor |
we apply bayesn, our new hierarchical bayesian model for the seds of type ia supernovae (sne ia), to analyse the griz light curves of 157 nearby sne ia (0.015 < z < 0.08) from the public foundation supernova survey data set. we train a new version of bayesn, continuous from 0.35 to 0.95 μm, which we use to model ... | testing the consistency of dust laws in sn ia host galaxies: a bayesn examination of foundation dr1 |
formed in the aftermath of gravitational core-collapse supernova explosions, neutron stars are unique cosmic laboratories for probing the properties of matter under extreme conditions that cannot be reproduced in terrestrial laboratories. the interior of a neutron star, endowed with the highest magnetic fields known an... | phases of dense matter in compact stars |
directly comparing the 6 expansion rate measured by type ia supernovae data and the lower bound on the expansion rate set by the strong energy conditions or the null hypothesis that there never exists cosmic acceleration, we see 3σ direct evidence of cosmic acceleration and the rh=ct model is strongly excluded by the t... | the evidence of cosmic acceleration and observational constraints |
we present a high-resolution view of bubbles within the phantom galaxy (ngc 628), a nearby (~10 mpc), star-forming (~2 m ⊙ yr-1), face-on (i ~ 9°) grand-design spiral galaxy. with new data obtained as part of the physics at high angular resolution in nearby galaxies (phangs)-jwst treasury program, we perform a detailed... | phangs-jwst first results: multiwavelength view of feedback-driven bubbles (the phantom voids) across ngc 628 |
astrophysical collisionless shocks are common in the universe, occurring in supernova remnants, gamma ray bursts, and protostellar jets. they appear in colliding plasma flows when the mean free path for ion-ion collisions is much larger than the system size. it is believed that such shocks could be mediated via the ele... | collisionless shock experiments with lasers and observation of weibel instabilities |
we study mass-loss from the outer lagrange point (l2) in binary stellar mergers and their luminous transients by means of radiative hydrodynamical simulations. previously, we showed that for binary mass ratios 0.06 ≲ q ≲ 0.8, synchronous l2 mass-loss results in a radiatively inefficient, dust-forming unbound equatorial... | binary stellar mergers with marginally bound ejecta: excretion discs, inflated envelopes, outflows, and their luminous transients |
we present results of 2d axisymmetric core-collapse supernova simulations, employing the fornax code, of nine progenitor models spanning 12 to 25 m⊙. four of the models explode with inelastic scattering off electrons and neutrons as well as the many-body correction to neutrino-nucleon scattering opacities. we show that... | revival of the fittest: exploding core-collapse supernovae from 12 to 25 m⊙ |
recent results from the pierre auger collaboration have shown that the composition of ultrahigh-energy cosmic rays (uhecrs) becomes gradually heavier with increasing energy. although gamma-ray bursts (grbs) have been promising sources of uhecrs, it is still unclear whether they can account for the auger results because... | low-luminosity gamma-ray bursts as the sources of ultrahigh-energy cosmic ray nuclei |
self induced neutrino flavor conversions in the dense regions of stellar core collapse are almost exclusively studied in the standard two flavor scenario. linear stability analysis has been successfully used to understand these flavor conversions. this is the first linearized study of three flavor fast instabilities. t... | three flavor neutrino conversions in supernovae: slow & fast instabilities |
realizing refsdal’s original idea from 1964, we present estimates of the hubble constant that are complementary to, and potentially competitive with, those of other cosmological probes. we use the observed positions of 89 multiple images, with extensive spectroscopic information, from 28 background sources and the meas... | measuring the value of the hubble constant “à la refsdal” |
we investigate r-process nucleosynthesis in three-dimensional general relativistic magnetohydrodynamic simulations of jet-driven supernovae resulting from rapidly rotating, strongly magnetized core-collapse. we explore the effect of misaligning the pre-collapse magnetic field with respect to the rotation axis by perfor... | r-process nucleosynthesis from three-dimensional jet-driven core-collapse supernovae with magnetic misalignments |
recent observations of type ia supernovae (sne ia) have shown diversified properties of the explosion strength, light curves, and chemical composition. to investigate possible origins of such diversities in sne ia, we have presented multidimensional hydrodynamical studies of explosions and associated nucleosynthesis in... | explosive nucleosynthesis in sub-chandrasekhar-mass white dwarf models for type ia supernovae: dependence on model parameters |
the next galactic core-collapse supernova (ccsn) has already exploded, and its electromagnetic (em) waves, neutrinos, and gravitational waves (gws) may arrive at any moment. we present an extensive study on the potential sensitivity of prospective detection scenarios for gws from ccsne within 5 mpc, using realistic noi... | observing gravitational waves from core-collapse supernovae in the advanced detector era |
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