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we present bolometric and broadband light curves and spectra for a suite of core-collapse supernova models exploded self-consistently in spherical symmetry within the push framework. we analyze broad trends in these light curves and categorize them based on morphology. we find that these morphological categories relate... | core-collapse supernovae: from neutrino-driven 1d explosions to light curves and spectra |
pair-instability supernovae (pisne) are very luminous explosions of massive, low-metallicity stars. they can potentially be observed out to high redshifts due to their high explosion energies, thus providing a probe of the universe prior to reionization. the near-infrared camera (nircam) on board the james webb space t... | detection strategies for the first supernovae with jwst |
volatiles are vital ingredients for a habitable planet. angrite meteorites sample the most volatile-depleted planetesimal in the solar system, particularly for the alkali elements. they are prime targets for investigating the formation of volatile-poor rocky planets, yet their exceptionally low volatile content present... | potassium isotope heterogeneity in the early solar system controlled by extensive evaporation and partial recondensation |
intraperitoneal (ip) aerosolized anticancer drug delivery was recently introduced in the treatment of patients with peritoneal metastases. however, little is known on the effect of treatment parameters on the spatial distribution of the aerosol droplets in the peritoneal cavity. here, computational fluid dynamics (cfd)... | optimization of intraperitoneal aerosolized drug delivery using computational fluid dynamics (cfd) modeling |
the paris meteorite is one of the most primitive carbonaceous chondrites. it is reported to be the least aqueously altered cm chondrite, and to have experienced only weak thermal metamorphism. we have analyzed for the first time the amino acid and hydrocarbon contents of this pristine meteorite by gas chromatography-ma... | the amino acid and hydrocarbon contents of the paris meteorite: insights into the most primitive cm chondrite |
strong nebular emission lines are an important diagnostic tool for tracing the evolution of star-forming galaxies across cosmic time. however, different observational setups can affect these lines, and the derivation of the physical nebular properties. we analyze 12 local star-forming galaxies from the cos legacy spect... | classy v: the impact of aperture effects on the inferred nebular properties of local star-forming galaxies |
context. the age-velocity dispersion relation is an important tool to understand the evolution of the disc of the andromeda galaxy (m 31) in comparison with the milky way.aims: we use planetary nebulae (pne) to obtain the age-velocity dispersion relation in different radial bins of the m 31 disc.methods: we separate th... | the survey of planetary nebulae in andromeda (m 31). ii. age-velocity dispersion relation in the disc from planetary nebulae |
we present mid-infrared photometry of the orion bar obtained with the faint object infrared camera for the sofia telescope (forcast) on board sofia at 6.4, 6.6, 7.7, 19.7, 31.5, and 37.1 μm. by complementing this observation with archival forcast and herschel/pacs images, we are able to construct a complete infrared sp... | the orion hii region and the orion bar in the mid-infrared |
calcium-rich gap transients represent an intriguing new class of faint and fast-evolving supernovae that exhibit strong [ca ii] emission in their nebular phase spectra. in this paper, we present the discovery and follow-up observations of a faint and fast-evolving transient, iptf 16hgs, that exhibited a double-peaked l... | iptf 16hgs: a double-peaked ca-rich gap transient in a metal-poor, star-forming dwarf galaxy |
we report the detection of diffuse lyα emission, or lyα halos (lahs), around star-forming galaxies at z ≈ 3.78 and 2.66 in the noao deep wide-field survey boötes field. our samples consist of a total of ∼1400 galaxies, within two separate regions containing spectroscopically confirmed galaxy overdensities. they provide... | the diversity of diffuse lyα nebulae around star-forming galaxies at high redshift |
the massive o4.5 v + o5.5 v binary vfts 352 in the tarantula nebula is one of the shortest-period and most massive overcontact binaries known. recent theoretical studies indicate that some of these systems could ultimately lead to the formation of gravitational waves via black hole binary mergers through the chemically... | clues on the origin and evolution of massive contact binaries: atmosphere analysis of vfts 352 |
the first water cherenkov detector of the lhaaso experiment (wcda-1) has been operating since april, 2019. the first 10 months of data have been analyzed to test its performance by observing the crab nebula as a standard candle. the wcda-1 achieves the sensitivity of 65 mcu per year with a statistical threshold of 5 $\... | performance of lhaaso-wcda and observation of crab nebula as a standard candle |
we present the deepest constraints yet on the median rest-uv+optical spectral energy distribution (sed) of z ~ 10 galaxies prior to james webb space telescope science operations. we constructed stacks based on four robust j 125 dropouts, previously identified across the goods fields. we used archival hubble space teles... | deep spitzer/irac data for z 10 galaxies reveal blue balmer break colors: young stellar populations at500 myr of cosmic time |
a large fraction of core-collapse supernovae (ccsne), 30-50 per cent, are expected to originate from the low-mass end of progenitors with mzams = 8-12 m⊙. however, degeneracy effects make stellar evolution modelling of such stars challenging, and few predictions for their supernova light curves and spectra have been pr... | emission line models for the lowest mass core-collapse supernovae - i. case study of a 9 m⊙ one-dimensional neutrino-driven explosion |
since the discovery of jupiter-sized planets in extremely close orbits around sun-like stars, several mechanisms have been proposed to produce these "hot jupiters". here we address their pile-up at 0.05 au observed in stellar radial velocity surveys, their long-term orbital stability in the presence of stellar tides, a... | formation of hot jupiters through disk migration and evolving stellar tides |
we present the first direct comparison between balmer line and panchromatic spectral energy distribution (sed)-based star formation rates (sfrs) for z∼ 2 galaxies. for this comparison, we used 17 star-forming galaxies selected from the mosfire deep evolution field (mosdef) survey, with 3σ detections for hα and at least... | the mosdef survey: the strong agreement between hα and uv-to-fir star formation rates for z ~ 2 star-forming galaxies |
one of the key physical processes that helps prevent strong cooling flows in galaxy clusters is the continued energy input from the central active galactic nucleus (agn) of the cluster. however, it remains unclear how this energy is thermalised so that it can effectively prevent global thermal instability. one possible... | cosmic rays and thermal instability in self-regulating cooling flows of massive galaxy clusters |
orion source i (“srci”) is the protostar at the center of the kleinmann-low nebula. alma observations of srci with 0.″2 angular resolution were made at 350 and 660 ghz to search for the h26α and h21α hydrogen recombination lines and to measure the continuum flux densities. the recombination lines were not detected, rul... | alma observations of orion source i at 350 and 660 ghz |
the ionizing radiation of massive stars sculpts the surrounding neutral gas into pillar-like structures. direct signatures of star formation through outflows and jets are observed in these structures, typically at their tips. recent numerical simulations have suggested that this star formation could potentially be trig... | on the compressive nature of turbulence driven by ionizing feedback in the pillars of the carina nebula |
there are currently few approved effective treatments for sars-cov-2, the virus responsible for the covid-19 pandemic. nanobodies are 12-15 kda single-domain antibody fragments that can be delivered by inhalation and are amenable to relatively inexpensive large scale production compared to other biologicals. we have is... | high affinity nanobodies block sars-cov-2 spike receptor binding domain interaction with human angiotensin converting enzyme |
we present an optical spectroscopic study of the black hole x-ray transient v4641 sgr (=sax j1819.3-2525) covering the 1999, 2002, and 2004 outbursts. the spectra were taken over 22 different epochs during the low-luminosity phases that follow the sharp and bright outburst peaks displayed by the system. the data reveal... | the low-luminosity accretion disc wind of the black hole transient v4641 sagittarii |
context. l1630 in the orion b molecular cloud, which includes the iconic horsehead nebula, illuminated by the star system σ ori, is an example of a photodissociation region (pdr). in pdrs, stellar radiation impinges on the surface of dense material, often a molecular cloud, thereby inducing a complex network of chemica... | [c ii] emission from l1630 in the orion b molecular cloud |
we extend the range of validity of the artis 3d radiative transfer code up to hundreds of days after explosion, when type ia supernovae (sne ia) are in their nebular phase. to achieve this, we add a non-local thermodynamic equilibrium population and ionization solver, a new multifrequency radiation field model, and a n... | monte carlo radiative transfer for the nebular phase of type ia supernovae |
we explore the observational appearance of the merger of a low-mass star with a white dwarf (wd) binary companion. we are motivated by recent work finding that multiple tensions between the observed properties of cataclysmic variables (cvs) and standard evolution models are resolved if a large fraction of cv binaries m... | transients from the cataclysmic deaths of cataclysmic variables |
jets are ubiquitous in the universe and are seen from a large number of astrophysical objects including active galactic nuclei, gamma ray bursters, micro-quasars, proto-planetary nebulae, young stars and even brown dwarfs. in every case they seem to be accompanied by an accretion disk and, while the detailed physics ma... | jets from young stars |
calcium-rich supernovae (ca-rich sne) are peculiar low-luminosity sne ib with relatively strong ca spectral lines at ∼2 months after peak brightness. this class also has an extended projected offset distribution, with several members of the class offset from their host galaxies by 30-150 kpc. there is no indication of ... | kinematics and host-galaxy properties suggest a nuclear origin for calcium-rich supernova progenitors |
six planetary nebulae (pn) are known in the kepler space telescope field of view, three of which are newly identified. of the five central stars of pn with useful kepler data, one, j193110888+4324577, is the first short-period, post-common envelope binary exhibiting relativistic beaming effects. a second, the central s... | identifying close binary central stars of pn with kepler |
we report on the extensive multi-wavelength observations of the blazar markarian 421 (mrk 421) covering radio to γ-rays, during the 4.5 year period of argo-ybj and fermi common operation time, from 2008 august to 2013 february. these long-term observations, extending over an energy range of 18 orders of magnitude, prov... | 4.5 years of multi-wavelength observations of mrk 421 during the argo-ybj and fermi common operation time |
the orion nebula cluster (onc) is the nearest site of ongoing massive star formation, which allows us to study the kinematics and dynamics of the region in detail and constrain star formation theories. using hst acs/wfpc2/wfc3ir and keck ii nirc2 data, we have measured the proper motions of 701 stars within an ∼6‧ × 6‧... | stellar proper motions in the orion nebula cluster |
the orion nebula cluster (onc) is the nearest dense star-forming region at ~400 pc away, making it an ideal target to study the impact of high stellar density and proximity to massive stars (the trapezium) on protoplanetary disk evolution. the omc1 molecular cloud is a region of high extinction situated behind the trap... | small protoplanetary disks in the orion nebula cluster and omc1 with alma |
getman et al. report the discovery, energetics, frequencies, and effects on environs of >1000 x-ray superflares with x-ray energies ex ~ 1034-1038 erg from pre-main-sequence (pms) stars identified in the chandra mystix and sfincs surveys. here we perform detailed plasma evolution modeling of 55 bright mystix/sfincs ... | x-ray superflares from pre-main-sequence stars: flare modeling |
a significative fraction of all massive stars in the milky way move supersonically through their local interstellar medium (ism), producing bow shock nebulae by wind-ism interaction. the stability of these observed astrospheres around cool massive stars challenges precedent 2d (magneto-)hydrodynamical (mhd) simulations... | 3d mhd astrospheres: applications to irc-10414 and betelgeuse |
mev gamma-rays provide a unique window for the direct measurement of line emissions from radioisotopes, but observations have made little significant progress since comptel on board the compton gamma-ray observatory (cgro). to observe celestial objects in this band, we are developing an electron-tracking compton camera... | first observation of the mev gamma-ray universe with bijective imaging spectroscopy using the electron-tracking compton telescope on board smile-2+ |
primordial black holes (pbhs) formed in the early universe constitute an attractive candidate for dark matter. within the gaseous environment of the interstellar medium, pbhs with accretion discs naturally launch outflows such as winds and jets. we discuss for the first time how pbhs with significant spin can sustain p... | impacts of jets and winds from primordial black holes |
detailed observational characterization of transiting exoplanet systems has revealed that the spin-axes of massive (m≳ 1.2{m}⊙ ) stars often exhibit substantial misalignments with respect to the orbits of the planets they host. conversely, lower-mass stars tend to only have limited obliquities. a similar trend has rece... | magnetic origins of the stellar mass-obliquity correlation in planetary systems |
ts34 is a type b1 ca-al-rich inclusion (cai) from the allende cv3 chondrite, consisting of spinel, melilite, ti-al-rich clinopyroxene (fassaite) and minor anorthite in an igneous texture. oxygen and magnesium isotopic compositions were measured by secondary ion mass spectrometry in spots of known chemical composition i... | crystal growth and disequilibrium distribution of oxygen isotopes in an igneous ca-al-rich inclusion from the allende carbonaceous chondrite |
measured and modeled ca and ti isotopic fractionation effects in a diverse suite of refractory inclusions are used to understand processes of condensation in the solar protoplanetary disk where they and their precursor materials formed. this coordinated approach reveals largely decoupled isotopic signatures and implies... | calcium and titanium isotope fractionation in refractory inclusions: tracers of condensation and inheritance in the early solar protoplanetary disk |
aims: so far, only one rotating disk has been clearly identified and studied in agb or post-agb objects (in the red rectangle), by means of observations with high spectral and spatial resolution. however, disks are thought to play a key role in the late stellar evolution and are suspected to surround many evolved stars... | detection of keplerian dynamics in a disk around the post-agb star ac herculis |
the high energy stereoscopic system (h.e.s.s.) phase i instrument was an array of four $100\,\mathrm{m}^2$ mirror area imaging atmospheric cherenkov telescopes (iacts) that has very successfully mapped the sky at photon energies above $\sim 100\,$gev. recently, a $600\,\mathrm{m}^2$ telescope was added to the centre of... | observations of the crab nebula with h.e.s.s. phase ii |
context. sulphur is one of the most abundant elements in the universe (s/h 1.3 × 10-5) and plays a crucial role in biological systems on earth. the understanding of its chemistry is therefore of major importance.aims: our goal is to complete the inventory of s-bearing molecules and their abundances in the prototypical ... | abundances of sulphur molecules in the horsehead nebula. first ns+ detection in a photodissociation region |
in 2013, nustar observed the sgr b2 region and for the first time resolved its hard x-ray emission on subarcminute scales. two prominent features are detected above 10 kev: a newly emerging cloud, g0.66-0.13, and the central 90″ radius region containing two compact cores, sgr b2(m) and sgr b2(n), surrounded by diffuse ... | hard x-ray morphological and spectral studies of the galactic center molecular cloud sgr b2: constraining past sgr a* flaring activity |
we study the stellar population properties of the irac-detected 6 ≲ z ≲ 10 galaxy candidates from the spitzer ultra faint survey program. using the lyman break selection technique, we find a total of 17 galaxy candidates at 6 ≲ z ≲ 10 from hubble space telescope images (including the full-depth images from the hubble f... | spitzer ultra faint survey program (surfs up). ii. irac-detected lyman-break galaxies at 6 ≲ z ≲ 10 behind strong-lensing clusters |
we present mid- and far-ir imaging of four famous hypergiant stars: the red supergiants μ cep and vy cma, and the warm hypergiants irc +10420 and ρ cas. our 11-37 μm sofia/forcast imaging probes cool dust not detected in visual and near-ir imaging studies. adaptive optics 8-12 μm imaging of μ cep and irc +10420 with mm... | searching for cool dust in the mid-to-far infrared: the mass-loss histories of the hypergiants μ cep, vy cma, irc+10420, and ρ cas |
outflows are a pervasive feature of mechanical feedback from super star clusters (sscs) in starburst galaxies, playing a fundamental role in galaxy evolution. observations are now starting to confirm that outflows can undergo catastrophic cooling, suppressing adiabatic superwinds. here we present a suite of one-dimensi... | catastrophic cooling in superwinds: line emission and non-equilibrium ionization |
we use gaia dr2 to hunt for runaway stars from the orion nebula cluster (onc). we search a region extending 45° around the onc and out to 1 kpc to find sources that have overlapped in angular position with the cluster in the last ∼10 myr. we find ∼17,000 runaway/walkaway candidates that satisfy this 2d traceback condit... | hunting for runaways from the orion nebula cluster |
we present results from the remaining sources in our search for near-infrared (nir) candidate counterparts to ultraluminous x-ray sources (ulxs) within ≃10 mpc. we observed 23 ulxs in 15 galaxies and detected nir candidate counterparts to 6 of them. two of these have an absolute magnitude consistent with a single red s... | nir counterparts to ulxs (iii): completing the photometric survey and selected spectroscopic results |
we present results on the properties of neon emission in z ∼ 2 star-forming galaxies drawn from the mosfire deep evolution field (mosdef) survey. doubly ionized neon ([ne iii]λ3869) is detected at ≥3σ in 61 galaxies, representing ∼25% of the mosdef sample with hα, hβ, and [o iii]λ5007 detections at similar redshifts. w... | the mosdef survey: neon as a probe of ism physical conditions at high redshift |
we performed the deepest search for an x-ray emission line at between 0.5 and 7 kev from non-baryonic dark matter by the suzaku xis. dark matter associated with the milky way was selected as the target to obtain the best signal-to-noise ratio. from the suzaku archive, we selected 187 data sets of blank-sky regions that... | a search for a kev signature of radiatively decaying dark matter with suzaku xis observations of the x-ray diffuse background |
primitive meteorites preserve the chemical and isotopic composition of the first aggregates that formed from dust and gas in the solar nebula during the earliest stages of solar system evolution. gradual increase in the size of solid bodies from dust to aggregates and then to planetesimals finally led to the formation ... | accretion of the earth—missing components? |
in this study, we present one-dimensional, non-local-thermodynamic-equilibrium, radiative transfer simulations (using cmfgen) in which we introduce micro-clumping at nebular times into two type ia supernova ejecta models. we use one sub-chandrasekhar (sub-mch) ejecta model with 1.04 m⊙ and one chandrasekhar (mch) eject... | understanding nebular spectra of type ia supernovae |
the theory of optical thermodynamics provides a comprehensive framework that enables a self-consistent description of the intricate dynamics of nonlinear multimoded photonic systems. this theory, among others, predicts a pressurelike intensive quantity (p ^) that is conjugate to the system's total number of modes (m )—... | nature of optical thermodynamic pressure exerted in highly multimoded nonlinear systems |
volatiles from the solar nebula are known to be present in earth's deep mantle. the core also may contain solar nebula-derived volatiles, but in unknown amounts. here we use calculations of volatile ingassing and degassing to estimate the abundance of primordial 3he now in the core and track the rate of 3he exchange be... | primordial helium-3 exchange between earth's core and mantle |
the most massive stars dominate the chemical enrichment, mechanical and radiative feedback, and energy budget of their host environments. yet how massive stars initially form and how they evolve throughout their lives is ambiguous. the mass loss of the most massive stars remains a key unknown in stellar physics, with c... | the hydrogen clock to infer the upper stellar mass |
thermal refuges are thermally distinct riverscape features used by aquatic organisms during unfavourable thermal events, facilitating resilience in marginal environments. however, the thermal refuge concept is nebulous, and the often interchangeable use of the term 'thermal refugia' creates additional ambiguity. we arg... | an ecohydrological typology for thermal refuges in streams and rivers |
we present spitzer space telescope 3.6 and 4.5 μm observations of the binary neutron star merger gw170817 at 43, 74, and 264 days post-merger. using the final observation as a template, we uncover a source at the position of gw170817 at 4.5 μm with a brightness of 22.9 ± 0.3 ab mag at 43 days and 23.8 ± 0.3 ab mag at 7... | spitzer space telescope infrared observations of the binary neutron star merger gw170817 |
the physical origin of the near-ultraviolet mg ii emission remains an underexplored domain, unlike more typical emission lines that are detected in the spectra of star-forming galaxies. we explore the nebular and physical properties of a sample of 381 galaxies between 0.70 < z < 2.34 drawn from the muse hubble ul... | the muse hubble ultra deep field survey. xii. mg ii emission and absorption in star-forming galaxies |
we stack the rest-frame ultraviolet spectra of n = 14 highly magnified gravitationally lensed galaxies at redshifts 1.6< z< 3.6. the resulting new composite spans 900< {λ }{rest}< 3000 å, with a peak signal-to-noise ratio (s/n) of 103 per spectral resolution element (∼100 km s-1). it is the highest s/n, hig... | the magellan evolution of galaxies spectroscopic and ultraviolet reference atlas (megasaura). ii. stacked spectra |
the decomposition of the rotation curve of galaxies into contribution from the disc and dark halo remains uncertain and depends on the adopted mass-to-light ratio (m/l) of the disc. given the vertical velocity dispersion of stars and disc scale height, the disc surface mass density and hence the m/l can be estimated. w... | resolving the disc-halo degeneracy - i: a look at ngc 628 |
mirror stars are a generic prediction of dissipative dark matter models, including minimal atomic dark matter and twin baryons in the mirror twin higgs. mirror stars can capture regular matter from the interstellar medium through extremely suppressed kinetic mixing interactions between the regular and the dark photon. ... | electromagnetic signatures of mirror stars |
the multi-unit spectroscopic explorer (muse) has enabled a renaissance of the planetary nebula luminosity function (pnlf) as a standard candle. in the case of ngc 300, we learned that the precise spectrophotometry of muse was crucial to obtain an accurate pnlf distance. we present the advantage of the integral field sp... | precision spectrophotometry for pnlf distances: the case of ngc 300 |
we present an early-phase g-band light curve and visual-wavelength spectra of the normal type ia supernova (sn) 2013gy. the light curve is constructed by determining the appropriate s-corrections to transform kait natural-system b- and v-band photometry and carnegie supernova project natural-system g-band photometry to... | discovery and progenitor constraints on the type ia supernova 2013gy |
molecular d/h ratios are frequently used to probe the chemical past of solar system volatiles. yet it is unclear which parts of the solar nebula hosted an active deuterium fractionation chemistry. to address this question, we present 0"2-0"4 atacama large millimeter/submillimeter array (alma) observations of dco+ and d... | the tw hya rosetta stone project. i. radial and vertical distributions of dcn and dco+ |
we present a new clustering method, significance mode analysis (sigma), for extracting co-spatial and co-moving stellar populations from large-scale surveys such as esa gaia. the method studies the topological properties of the density field in the multidimensional phase space. we validated sigma on simulated clusters ... | significance mode analysis (sigma) for hierarchical structures. an application to the sco-cen ob association |
photoionization models obtained with numerical codes are widely used to study the physics of the interstellar medium (planetary nebulae, hii regions, etc). grids of models are performed to understand the effects of the different parameters used to describe the regions on the observables (mainly emission line intensitie... | a virtual observatory for photoionized nebulae: the mexican million models database (3mdb). |
we find capillary wave turbulence (wt) spanning multiple dynamical regimes and geometries, all within a 40 μ l volume microfluidic system. this study is made viable with recent advances in ultra-high-speed digital holographic microscopy, providing 10 μ s time and 10 nm spatial resolutions for images across the entire f... | identification of weakly to strongly-turbulent three-wave processes in a micro-scale system |
we present extensive ultraviolet (uv) and optical photometric and optical spectroscopic follow-up of supernova (sn) 2021gno by the 'precision observations of infant supernova explosions' (poise) project, starting less than 2 d after the explosion. given its intermediate luminosity, fast photometric evolution, and quick... | sn 2021gno: a calcium-rich transient with double-peaked light curves |
we report on the spectroscopic confirmation of 68 new bright (g = 13.5-17.2 mag) and blue (pre-)white dwarfs (wds). this finding has allowed us to almost double the number of the hottest (teff ≥ 60 kk) known wds brighter than g = 16 mag. we increased the number of known ultra-high excitation (uhe) wds by 20%, found one... | the bright blue side of the night sky: spectroscopic survey of bright and hot (pre-) white dwarfs |
the luminous type iin sn 2010jl shows strong signs of interaction between the sn ejecta and dense circumstellar material. dust may be present in the unshocked ejecta; the cool, dense shell (cds) between the shocks in the interaction region; or in the circumstellar medium (csm). we present and model new optical and infr... | disentangling dust components in sn 2010jl: the first 1400 days |
we report the detection of emission in the v = 1 - 0 p(1) (3.51629 μm) and p(2) (3.60776 μm) rovibrational lines of the helium hydride cation (heh+) from the planetary nebula ngc 7027. these detections were obtained with the ishell spectrograph on nasa's infrared telescope facility on maunakea. they confirm the discove... | detection of vibrational emissions from the helium hydride ion (heh+) in the planetary nebula ngc 7027 |
we here report the detection of the nebular he ii λ4686 line in 32 h ii regions in the metal-poor collisional ring galaxy cartwheel using the multi-unit spectroscopic explorer (muse) data set. the measured i(he ii λ4686)/i(h β) ratio varies from 0.004 to 0.07, with a mean value of 0.010 ± 0.003. ten of these 32 h ii re... | detection of he++ ion in the star-forming ring of the cartwheel using muse data and ionizing mechanisms |
recently, the discovery of galactic frb 200428 associated with an x-ray burst (xrb) of sgr 1935+2154 has built a bridge between frbs and magnetar activities. in this letter, we assume that the xrb occurs in the magnetar magnetosphere. we show that the observational properties of frb 200428 and the associated xrb are co... | understanding frb 200428 in the synchrotron maser shock model: consistency and possible challenge |
dwarf spheroidal galaxies (dsphs) have been extensively investigated in the local group, but their low luminosity and surface brightness make similar work in more distant galaxy groups challenging. modern instrumentation unlocks the possibility of scrutinizing these faint systems in other environments, expanding the pa... | the properties of dwarf spheroidal galaxies in the cen a group. stellar populations, internal dynamics, and a heart-shaped hα ring |
we study the utility of the [o i] 6300 å forbidden line for identifying and interpreting externally driven photoevaporative winds in different environments and at a range of distances. thermally excited [o i] 6300 å is a well-known tracer of inner disc winds, so any external contribution needs to be distinguishable. in... | [o i] 6300 å emission as a probe of external photoevaporation of protoplanetary discs |
we present explosive transient spectral simulator (extrass), a newly developed code aimed at generating 3d spectra for supernovae in the nebular phase by using modern multidimensional explosion models as input. it is well established that supernovae are asymmetric by nature, and that the morphology is encoded in the li... | modelling supernova nebular lines in 3d with extrass |
thermonuclear and core-collapse supernova remnants (snrs) are the nebular leftovers of defunct stars. their morphology and emission properties provide insights into the evolutionary history of the progenitor star. but while some snrs are spherical, as expected from a point-like explosion expanding into a roughly unifor... | the sculpting of rectangular and jet-like morphologies in supernova remnants by anisotropic equatorially confined progenitor stellar winds |
we present [c ii] 158 μm and [o i] 63 μm observations of the bipolar h ii region rcw 36 in the vela c molecular cloud, obtained within the sofia legacy project feedback, which is complemented with apex 12/13co (3-2) and chandra x-ray (0.5-7 kev) data. this shows that the molecular ring, forming the waist of the bipolar... | the sofia feedback legacy survey dynamics and mass ejection in the bipolar h ii region rcw 36 |
on 2017 september 22, the icecube neutrino observatory reported the detection of the high-energy neutrino event ic 170922a, of potential astrophysical origin. it was soon determined that the neutrino direction was consistent with the location of the gamma-ray blazar txs 0506+056 (3fgl j0509.4+0541), which was in an ele... | veritas observations of the bl lac object txs 0506+056 |
aims: we study the dynamics and growth of dust particles in circumstellar disks of different masses that are prone to gravitational instability during the critical first myr of their evolution.methods: we solved the hydrodynamics equations for a self-gravitating and viscous circumstellar disk in a thin-disk limit using... | gravitoviscous protoplanetary disks with a dust component. iii. evolution of gas, dust, and pebbles |
context. radio continuum surveys of the galactic plane are an excellent way to identify different source populations such as planetary nebulae, h ii regions, and radio stars and characterize their statistical properties. the global view of star formation in the milky way (glostar) survey will study the star formation i... | glostar: radio source catalog i. 28° < ℓ < 36° and |b| < 1° |
the solar nebula contained a number of short-lived radionuclides (slrs) with half-lives of tens of myr or less, comparable to the timescales for formation of protostars and protoplanetary disks. therefore, determining the origins of slrs would provide insights into star formation and the sun's astrophysical birth envir... | short-lived radionuclides in meteorites and the sun's birth environment |
planetary nebulae (pne) are essential tracers of the kinematics of the diffuse halo and intracluster light where stellar spectroscopy is unfeasible, due to their strong emission lines. however, that is not all they can reveal about the underlying stellar population. in recent years, it has also been found that pne in t... | planetary nebulae as tracers of stellar population properties: unlocking their potential with integral-field spectroscopy |
ly α nebulae ubiquitously found around z > 2 quasars can supply unique constraints on the properties of the circumgalactic medium, such as its density distribution, provided the quasar halo mass is known. we present a new method to constrain quasar halo masses based on the line-of-sight velocity dispersion maps of l... | resolving the physics of quasar ly α nebulae (rephyne): i. constraining quasar host halo masses through circumgalactic medium kinematics |
connecting the gas in h ii regions to the underlying source of the ionizing radiation can help us constrain the physical processes of stellar feedback and how h ii regions evolve over time. with phangs-muse, we detect nearly 24 000 h ii regions across 19 galaxies and measure the physical properties of the ionized gas (... | stellar associations powering h ii regions - i. defining an evolutionary sequence |
fine-grained ca-al-rich inclusions (fgis) in cv chondrites are suggested to be condensates formed directly from the solar nebular gas. al-mg mineral isochrons of seven fgis from reduced cv chondrites efremovka, vigarano, thiel mountains 07007, and northwest africa 8613 were obtained via in situ al-mg isotope measuremen... | variations in initial 26al/27al ratios among fine-grained ca-al-rich inclusions from reduced cv chondrites |
we use a semi-empirical model to reproduce the 0.1-10μm spectral energy distribution (sed) of a sample of 85 luminous quasars. in the model, the continuum emission from the accretion disk as well as the nebular lines are represented by a single empirical template (disk), where differences in the optical spectral index ... | disentangling accretion disk and dust emissions in the infrared spectrum of type 1 agn |
context. young terrestrial planets, when they are still embedded in a circumstellar disk, accumulate an atmosphere of nebula gas. the evolution and eventual evaporation of the protoplanetary disk affect the structure and dynamics of the planetary atmosphere. these processes, combined with other mass loss mechanisms, su... | hydrodynamic simulations of captured protoatmospheres around earth-like planets |
context. how the diffuse medium of molecular clouds condenses in dense cores and how many of these cores will evolve in protostars is still a poorly understood step of the star formation process. much progress is being made in this field, thanks to the extensive imaging of star-forming regions carried out with the hers... | a catalogue of dense cores and young stellar objects in the lupus complex based on herschel. gould belt survey observations |
the morphologies of planetary nebula have long been believed to be due to wind shaping processes in which a "fast wind" from the central star impacts a previously ejected envelope. it is assumed that asymmetries existing in the "slow wind" envelope would lead to inertial confinement, shaping the resulting interacting w... | planetary nebulae shaped by common envelope evolution |
this work presents an interferometric study of the massive-binary fraction in the orion trapezium cluster with the recently comissioned gravity instrument. we observed a total of 16 stars of mainly ob spectral type. we find three previously unknown companions for θ1 ori b, θ2 ori b, and θ2 ori c. we determined a separa... | multiple star systems in the orion nebula |
hertzsprung-russell diagrams of star-forming regions show a large luminosity spread. this is incompatible with well-defined isochrones based on classic non-accreting protostellar evolution models. protostars do not evolve in isolation of their environment, but grow through accretion of gas. in addition, while an age ca... | explaining the luminosity spread in young clusters: proto and pre-main sequence stellar evolution in a molecular cloud environment |
nebular phase spectra of core-collapse supernovae (sne) provide critical and unique information on the progenitor massive star and its explosion. we present a set of one-dimensional steady-state non-local thermodynamic equilibrium radiative transfer calculations of type ii sne at 300 d after explosion. guided by the re... | radiative-transfer modeling of nebular-phase type ii supernovae. dependencies on progenitor and explosion properties |
we present an optical nebular spectrum of the nearby type ia supernova 2011fe, obtained 981 d after explosion. sn 2011fe exhibits little evolution since the +593 d optical spectrum, but there are several curious aspects in this new extremely late-time regime. we suggest that the persistence of the ∼5800 å feature is du... | constraining the progenitor companion of the nearby type ia sn 2011fe with a nebular spectrum at +981 d |
we present results from a survey of the internal kinematics of 49 star-forming galaxies at z∼ 2 in the candels fields with the keck/mosfire spectrograph, survey in the near-infrared of galaxies with multiple position angles (sigma). kinematics (rotation velocity v rot and gas velocity dispersion {σ }g) are measured fro... | kinematic downsizing at z ∼ 2 |
we present a new model describing the evolution of triple stars that undergo common envelope evolution, using a combination of analytical and numerical techniques. the early stages of evolution are driven by dynamical friction with the envelope, which causes the outer triple orbit to shrink faster than the inner binary... | estimating the outcomes of common envelope evolution in triple stellar systems |
we analyse a sample of eight highly magnified galaxies at redshift 0.6 < z < 1.5 observed with muse, exploring the resolved properties of these galaxies at sub-kiloparsec scales. combining multiband hst photometry and muse spectra, we derive the stellar mass, global star formation rates (sfrs), extinction and met... | kinematics, turbulence, and star formation of z ∼ 1 strongly lensed galaxies seen with muse |
context. the kleinmann-low nebula in orion (orion-kl) is the nearest example of a high-mass star-forming environment. studying the resolved chemical substructures of this complex region provides important insight into the chemistry of high-mass star-forming regions (hmsfrs), as it relates to their evolutionary states.a... | resolving the chemical substructure of orion-kl |
the depletion pattern of volatile elements on earth and other differentiated terrestrial bodies provides a unique insight as to the nature and origin of planetary building blocks. the processes responsible for the depletion of volatile elements range from the early incomplete condensation in the solar nebula to the lat... | chondritic mn/na ratio and limited post-nebular volatile loss of the earth |
we analyse the morphologies of three core collapse supernova remnants (ccsnrs) and the energy of jets in other ccsnrs and in super luminous supernovae (slsne) of type ib/ic/iib, and conclude that these properties are well explained by the last jets' episode as expected in the jet feedback explosion mechanism of core co... | the imprints of the last jets in core collapse supernovae |
we report on the detection of flaring activity from the fanaroff-riley i radio galaxy ngc 1275 in very-high-energy (vhe, e > 100 gev) gamma rays with the major atmospheric gamma imaging cherenkov (magic) telescopes. the observations were performed between 2016 september and 2017 february, as part of a monitoring pro... | gamma-ray flaring activity of ngc1275 in 2016-2017 measured by magic |
lenticular galaxies are generally thought to have descended from spirals via morphological transformation, although recent numerical simulations have shown that minor or even major mergers can also lead to an s0-like remnant. these mechanisms, however, are active in a dense environment such as a group or a cluster of g... | forming lenticular galaxies via violent disk instability |
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