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aims: we present a comprehensive dataset of optical and near-infrared photometry and spectroscopy of type ia supernova (sn) 2016hnk, combined with integral field spectroscopy (ifs) of its host galaxy, mcg -01-06-070, and nearby environment. our goal with this complete dataset is to understand the nature of this peculia... | evidence for a chandrasekhar-mass explosion in the ca-strong 1991bg-like type ia supernova 2016hnk |
we present alma observations of 101 protoplanetary disks within the star-forming region lynds 1641 in the orion molecular cloud a. our observations include 1.33 mm continuum emission and spectral windows covering the j = 2-1 transition of 12co, 13co, and c18o. we detect 89 protoplanetary disks in the dust continuum at ... | an alma survey of protoplanetary disks in lynds 1641 |
the diffuse ionized gas (dig) contributes to the nebular emission of galaxies, resulting in emission line flux ratios that can be significantly different from those produced by h ii regions. comparing the emission of [sii]λ6717,31 between pointed observations of h ii regions in nearby galaxies and integrated spectra of... | the diffuse ionized gas (dig) in star-forming galaxies: the influence of aperture effects on local h ii regions |
the lyman alpha emission line (lyα) of neutral hydrogen (hi) is intrinsically the brightest emission feature in the spectrum of astrophysical nebulae, making it a very attractive observational feature with which to survey galaxies. moreover as an ultraviolet resonance line, lyα possesses several unique characteristics ... | lyman alpha emitting galaxies in the nearby universe |
iras 00500+6713 is a hypothesized remnant of a type iax supernova sn 1181. multi-wavelength observations have revealed its complicated morphology; a dusty infrared ring is sandwiched by the inner and outer x-ray nebulae. we analyze the archival x-ray data taken by xmm-newton and chandra to constrain the angular size, m... | a dynamical model for iras 00500+6713: the remnant of a type iax supernova sn 1181 hosting a double degenerate merger product wd j005311 |
the iab iron meteorite complex consists of a main group (mg) and five chemical subgroups (sll, slm, slh, shl, and shh). here, mass-independent mo and radiogenic 182w isotope compositions are reported for iab complex meteorites to evaluate the genetics and chronology, respectively, of the mg and subgroups. osmium isotop... | characterizing cosmochemical materials with genetic affinities to the earth: genetic and chronological diversity within the iab iron meteorite complex |
discs around young planets, so-called circumplanetary discs (cpds), are essential for planet growth, satellite formation, and planet detection. we study the millimetre and centimetre emission from accreting cpds by using the simple α disc model. we find that it is easier to detect cpds at shorter radio wavelengths (e.g... | on the radio detectability of circumplanetary discs |
aimdeforestation is rapidly altering southeast asian landscapes, resulting in some of the highest rates of habitat loss worldwide. among the many species facing declines in this region, clouded leopards rank notably for their ambassadorial potential and capacity to act as powerful levers for broader forest conservation... | multi‑scale habitat modelling identifies spatial conservation priorities for mainland clouded leopards (neofelis nebulosa) |
context. ngc 7023 is a well-studied reflection nebula, which shows strong emission from polycyclic aromatic hydrocarbon (pah) molecules in the form of aromatic infrared bands (aibs). the spectral variations of the aibs in this region are connected to the chemical evolution of the pah molecules which, in turn, depends o... | mapping pah sizes in ngc 7023 with sofia |
strong lensing offers a precious opportunity for studying the formation and early evolution of super star clusters that are rare in our cosmic backyard. the sunburst arc, a lensed cosmic noon galaxy, hosts a young super star cluster with escaping lyman continuum radiation. analyzing archival hubble space telescope imag... | nitrogen-enriched, highly pressurized nebular clouds surrounding a super star cluster at cosmic noon |
context. the multiplicity of classical cepheids (ccs) and rr lyrae stars (rrls) is still imperfectly known, particularly for rrls.aims: in order to complement the close-in short orbital period systems presented in paper i, our aim is to detect the wide, spatially resolved companions of the targets of our reference samp... | multiplicity of galactic cepheids and rr lyrae stars from gaia dr2. ii. resolved common proper motion pairs |
our nearest large cosmological neighbour, the andromeda galaxy (m31), is a dynamical system, and an accurate measurement of its total mass is central to our understanding of its assembly history, the life-cycles of its satellite galaxies, and its role in shaping the local group environment. here, we apply a novel appro... | the need for speed: escape velocity and dynamical mass measurements of the andromeda galaxy |
in our solar system, terrestrial planets and meteoritical matter exhibit various bulk compositions. to understand this variety of compositions, formation mechanisms of meteorites are usually investigated via a thermodynamic approach that neglects the processes of transport throughout the protosolar nebula. here, we inv... | rocklines as cradles for refractory solids in the protosolar nebula |
recently two collaborations, tibet and hawc, presented new measurements of gamma-ray spectrum from crab nebula (amenomori et al. in phys rev lett 123(5):051101, 2019, arxiv:1906.05521 [astro-ph.he]; abeysekara et al. [hawc collaboration] in astrophys. j. 881, 134, (2019), arxiv:1905.12518 [astro-ph.he]) which continues... | new constraints on lorentz invariance violation from crab nebula spectrum beyond 100 tev |
protoplanetary discs (ppds) in the orion nebula cluster (onc) are irradiated by uv fields from the massive star θ1c. this drives thermal winds, inducing mass-loss rates of up to \dot{m}_wind∼ 10^{-7} m_⊙ yr-1 in the `proplyds' (ionized ppds) close to the centre. for the mean age of the onc and reasonable initial ppd ma... | a solution to the proplyd lifetime problem |
we present late-time spectra of eight type ia supernovae (sne ia) obtained at >200 d after peak brightness using the gemini south and keck telescopes. all of the sne ia in our sample were nearby, well separated from their host galaxy's light, and have early-time photometry and spectroscopy from the las cumbres obser... | nebular-phase spectra of nearby type ia supernovae |
i suggest a spiral-in process in which a stellar companion grazes the envelope of a giant star while both the orbital separation and the giant radius shrink simultaneously, forming a close binary system. the binary system might be viewed as evolving in a constant state of "just entering a common envelope (ce) phase." i... | close stellar binary systems by grazing envelope evolution |
saturn formed beyond the snow line in the primordial solar nebula that made it possible for it to accrete a large mass. disk instability and core accretion models have been proposed for saturn's formation, but core accretion is favored on the basis of its volatile abundances, internal structure, hydrodynamic models, ch... | the origin and evolution of saturn, with exoplanet perspective |
aims: we investigate the role played by a pre-supernova (sn) ambient magnetic field in the dynamics of the expanding remnant of sn 1987a, and the origin and evolution of the radio emission from the remnant, in particular during the interaction of the blast wave with the nebula surrounding the sn.methods: we modeled the... | 3d mhd modeling of the expanding remnant of sn 1987a. role of magnetic field and non-thermal radio emission |
context. lyman α blobs (labs) are large-scale radio-quiet lyman α (lyα) nebula at high-z that occur predominantly in overdense proto-cluster regions. in particular, there is the prototypical ssa22a-lab1 at z = 3.1, which has become an observational reference for labs across the electromagnetic spectrum.aims: we want to... | deciphering the lyman α blob 1 with deep muse observations |
compact nonresonant systems of sub-jovian planets are the most common outcome of the planet formation process. despite exhibiting broad overall diversity, these planets also display dramatic signatures of intrasystem uniformity in their masses, radii, and orbital spacings. although the details of their formation and ea... | architectures of compact super-earth systems shaped by instabilities |
we present the key results from an intensive and coordinated ten-year amateur observational programme designed to uncover and confirm galactic planetary nebulae (pne). this was undertaken and led by a dedicated group of largely french amateur astronomers in collaboration with professional colleagues. over this period t... | amateur pn discoveries and their spectral confirmation: a significant new addition to the galactic pn inventory |
gas-phase metallicities of galaxies are typically measured through auroral or nebular emission lines, but metallicity also leaves an imprint on the overall spectral energy distribution (sed) of a galaxy and can be estimated through sed fitting. we use the prospect sed fitting code with a flexible parametric star format... | devils: cosmic evolution of sed-derived metallicities and their connection to star formation histories |
the metallicity structure of the milky way disk stems from the chemodynamical evolutionary history of the galaxy. we use the national radio astronomy observatory karl g. jansky very large array to observe ∼8-10 ghz hydrogen radio recombination line and radio-continuum emission toward 82 galactic h ii regions. we use th... | metallicity structure in the milky way disk revealed by galactic h ii regions |
natures of progenitors of type ia supernovae (sne ia) have not yet been clarified. there has been long and intensive discussion on whether the so-called single degenerate (sd) scenario or the double degenerate (dd) scenario, or anything else, could explain a major population of sne ia, but the conclusion has not yet be... | progenitors of type ia supernovae |
measurements of stellar properties of galaxies when the universe was less than one billion years old yield some of the only observational constraints on the onset of star formation. we present here the inclusion of spitzer/irac imaging in the fitting of the spectral energy distribution of the seven highest-redshift gal... | stellar properties of z ≳ 8 galaxies in the reionization lensing cluster survey |
we introduce project megasaura: the magellan evolution of galaxies spectroscopic and ultraviolet reference atlas. megasaura comprises medium-resolution, rest-frame ultraviolet spectroscopy of n = 15 bright gravitationally lensed galaxies at redshifts of 1.68 < z < 3.6, obtained with the mage spectrograph on the m... | the magellan evolution of galaxies spectroscopic and ultraviolet reference atlas (megasaura). i. the sample and the spectra |
six billion years from now, while evolving on the asymptotic giant branch (agb), the sun will metamorphose from a red giant into a beautiful planetary nebula. this spectacular evolution will impact the solar system planets, but observational confirmations of the predictions of evolution models are still elusive as no p... | alma observations of the nearby agb star l2 puppis. i. mass of the central star and detection of a candidate planet |
we present the bayesian oxygen and nitrogen abundance determinations (bond) method. bond is a bayesian code (available at: http://bond.ufsc.br) to simultaneously derive oxygen and nitrogen abundances in giant h ii regions. it compares observed emission lines to a grid of photoionization models without assuming any rela... | bond: bayesian oxygen and nitrogen abundance determinations in giant h ii regions using strong and semistrong lines |
we present multiband ultraviolet and optical light curves, as well as visual-wavelength and near-infrared spectroscopy of the type ii linear (iil) supernova (sn) 2013by. we show that sn 2013by and other sne iil in the literature, after their linear decline phase that start after maximum, have a sharp light-curve declin... | supernova 2013by: a type iil supernova with a iip-like light-curve drop★ |
we present results from the mosfire deep evolution field survey on broad flux from the nebular emission lines hα, [n ii], [o iii], hβ, and [s ii]. the sample consists of 127 star-forming galaxies at 1.37 < z < 2.61 and 84 galaxies at 2.95 < z < 3.80. we decompose the emission lines using narrow and broad ga... | the mosdef survey: broad emission lines at z = 1.4-3.8 |
we present new atacama large millimeter/submillimeter array band 7 observational results of a lyman-break galaxy at z = 7.15, b14-65666 ("big three dragons"), which is an object detected in [o iii] 88 μm, [c ii] 158 μm, and dust continuum emission during the epoch of reionization. our targets are the [n ii] 122 μm fine... | big three dragons: a [n ii] 122 μm constraint and new dust-continuum detection of a z = 7.15 bright lyman-break galaxy with alma |
stars form in molecular clouds in the interstellar medium (ism) with a turbulent kinematic state. newborn stars therefore should retain the turbulent kinematics of their natal clouds. gaia dr2 and apogee-2 surveys in combination provide three-dimensional (3d) positions and 3d velocities of young stars in the orion mole... | measuring turbulence with young stars in the orion complex |
super star cluster (ssc) a1 ($3.1\times 10^5\, \mathrm{m}_\odot$) in ngc 3125 has one of the strongest ($ew=4.6\pm 0.5\,$ å) broad ($fwhm=1131\pm 40\,$ km s-1) he ii λ1640 emission lines in the nearby universe and constitutes an important template for interpreting observations of extreme he ii emitters out to redshifts... | extreme broad he ii emission at high and low redshifts: the dominant role of vms in ngc 3125-a1 and cdfs131717 |
planetary nebulae represent a potential late stage of stellar evolution, however, their central stars (cspne) are relatively faint and, therefore, pertinent information is available for merely < 20% of the galactic sample. consequently, the literature was surveyed to construct a new catalogue of 620 cspne featuring ... | catalogue of the central stars of planetary nebulae. expanded edition |
the atmospheric noble gas isotope and elemental bulk ratios on venus and earth provide important information on their origin and evolution. if the protoplanets grew to a certain mass (i.e. > 0.5 mearth), they could have captured h2-dominated primordial atmospheres by accreting gas from the circumstellar disk during ... | constraining the early evolution of venus and earth through atmospheric ar, ne isotope and bulk k/u ratios |
we have investigated nucleosynthetic mo isotope anomalies in 38 different bulk iron meteorites from 11 groups, to produce by far the largest and most precise dataset available to date for such samples. all magmatic iron groups were found to display deficits in s-process mo isotopes, with essentially constant anomalies ... | nucleosynthetic molybdenum isotope anomalies in iron meteorites - new evidence for thermal processing of solar nebula material |
we present an analysis of a new 120 deg2 radio continuum image of the large magellanic cloud (lmc) at 888 mhz with a bandwidth of 288 mhz and beam size of 13${_{.}^{\prime\prime}}$9 × 12${_{.}^{\prime\prime}}$1 from the australian square kilometre array pathfinder processed as part of the evolutionary map of the univer... | the askap-emu early science project: 888 mhz radio continuum survey of the large magellanic cloud |
we present the identification of 34 likely binary central stars (css) of planetary nebulae (pne) from kepler/k2 data, seven of which show eclipses. of these, 29 are new discoveries. two additional css with more complicated variability are also presented. we examined the light curves of all 'possible', 'likely', and 'tr... | binary central stars of planetary nebulae identified with kepler/k2 |
we present a new integral field spectroscopic dataset of the central part of the orion nebula (m 42), observed with the muse instrument at the eso vlt. we reduced the data with the public muse pipeline. the output products are two fits cubes with a spatial size of ~5.´9×4.´9 (corresponding to ~0.76 × 0.63 pc2) and a co... | a muse map of the central orion nebula (m 42) |
aims: long gamma-ray bursts (lgrbs) are associated with the deaths of massive stars and might therefore be a potentially powerful tool for tracing cosmic star formation. however, especially at low redshifts (z< 1.5) lgrbs seem to prefer particular types of environment. our aim is to study the host galaxies of a comp... | are long gamma-ray bursts biased tracers of star formation? clues from the host galaxies of the swift/bat6 complete sample of bright lgrbs. ii. star formation rates and metallicities at z < 1 |
context. extended filamentary hα emission nebulae are a striking feature of nearby galaxy clusters but the formation mechanism of the filaments, and the processes which shape their morphology remain unclear.aims: we conduct an investigation into the formation, evolution and destruction of dense gas in the centre of a s... | dense gas formation and destruction in a simulated perseus-like galaxy cluster with spin-driven black hole feedback |
a review of the properties of the tarantula nebula (30 doradus) in the large magellanic cloud is presented, primarily from the perspective of its massive star content. the proximity of the tarantula and its accessibility to x-ray through radio observations permit it to serve as a rosetta stone amongst extragalactic sup... | massive stars in the tarantula nebula: a rosetta stone for extragalactic supergiant hii regions |
a recent survey of the inner 0.35 × 0.35 pc of the ngc 2024 star-forming region revealed two distinct millimetre continuum disc populations that appear to be spatially segregated by the boundary of a dense cloud. the eastern (and more embedded) population is ~0.2-0.5 myr old, with an alma mm continuum disc detection ra... | proplyds in the flame nebula ngc 2024 |
we present optical and near-infrared (nir) observations of the type icn supernova (sn icn) 2022ann, the fifth member of its newly identified class of sne. its early optical spectra are dominated by narrow carbon and oxygen p-cygni features with absorption velocities of ~800 km s-1; slower than other sne icn and indicat... | sn 2022ann: a type icn supernova from a dwarf galaxy that reveals helium in its circumstellar environment |
nebular he ii λ4686 å line emission is useful to unveil active galactic nuclei (agn) residing in actively star-forming (sf) galaxies, typically missed by the standard bpt classification. here, we adopt the he ii diagnostic to identify hidden agn in the local universe using for the first time spatially resolved data fro... | unveiling hidden active nuclei in manga star-forming galaxies with he ii λ4686 line emission |
we demonstrate how the stellar and nebular conditions in star-forming galaxies modulate the emission and spectral profile of h i ly α emission line. we examine the net ly α output, kinematics, and in particular emission of blueshifted ly α radiation, using spectroscopy from with the cosmic origins spectrograph on hubbl... | spectral shapes of the ly α emission from galaxies - ii. the influence of stellar properties and nebular conditions on the emergent ly α profiles |
as a novel x-ray focusing technology, lobster-eye micropore optics (mpo) feature both a wide observing field of view and true imaging capability, promising sky monitoring with significantly improved sensitivity and spatial resolution in soft x-rays. since first proposed by angel, the optics have been extensively studie... | first wide field-of-view x-ray observations by a lobster-eye focusing telescope in orbit |
context. white dwarfs are nowadays routinely used as reliable cosmochronometers, allowing several stellar populations to be dated.aims: we present new white dwarf evolutionary sequences for low-metallicity progenitors. this is motivated by the recent finding that residual h burning in low-mass white dwarfs resulting fr... | white dwarf evolutionary sequences for low-metallicity progenitors: the impact of third dredge-up |
the traditional picture of post-starburst galaxies as dust- and gas-poor merger remnants, rapidly transitioning to quiescence, has been recently challenged. unexpected detections of a significant interstellar medium (ism) in many post-starburst galaxies raise important questions. are they truly quiescent, and if so, wh... | after the fall: the dust and gas in e+a post-starburst galaxies |
aims: we present a spectroscopic study of a sample of 287 planetary nebulas (pns) around the brightest cluster galaxy (bcg) m 87 in virgo a, of which 211 are located between 40 kpc and 150 kpc from the galaxy centre. with these data we can distinguish the stellar halo from the co-spatial intracluster light (icl) and st... | the outer regions of the giant virgo galaxy m 87 kinematic separation of stellar halo and intracluster light |
star-forming galaxies form a sequence in the [o iii] λ5007/{{h}}β versus [n ii] λ6584/{{h}}α diagnostic diagram, with low-metallicity, highly ionized galaxies falling in the upper left corner. drawing from a large sample of uv-selected star-forming galaxies at z∼ 2 with rest-frame optical nebular emission line measurem... | a high fraction of lyα emitters among galaxies with extreme emission line ratios at z ~2 |
a new class of faint, spectroscopically peculiar transients has emerged in the last decade. we term these events “calcium-strong transients” (casts) because of their atypically high calcium-to-oxygen nebular line ratios. previous studies have struggled to deduce the identity of their progenitors, due to a combination o... | the progenitors of calcium-strong transients |
we analyse maps of the spatially resolved nebular emission of ≈1500 star-forming galaxies at z ≈ 0.6-2.2 from deep k-band multi-object spectrograph and muse observations to measure the average shape of their rotation curves. we use these to test claims for declining rotation curves at large radii in galaxies at z ≈ 1-2... | the shapes of the rotation curves of star-forming galaxies over the last ≈10 gyr |
newly born, rapidly spinning magnetars have been invoked as the power sources of superluminous transients, including the class of “fast blue optical transients” (fbots). the extensive multiwavelength analysis of at2018cow, the first fbot discovered in real time, is consistent with the magnetar scenario and offers an un... | multimessenger implications of at2018cow: high-energy cosmic-ray and neutrino emissions from magnetar-powered superluminous transients |
we present optical spectra of nine galactic h ii regions observed with the 10.4 m gran telescopio canarias telescope and located at galactocentric distances (rg) from 4 to 8 kpc. the distances of the objects have been revised using gaia dr2 parallaxes. we determine the electron temperature for all the nebulae, which al... | on the radial abundance gradients of nitrogen and oxygen in the inner galactic disc |
we present extensive observations of sn 2018zd covering the first ∼450 d after the explosion. this sn shows a possible shock-breakout signal ∼3.6 h after the explosion in the unfiltered light curve, and prominent flash-ionization spectral features within the first week. the unusual photospheric temperature rise (rapidl... | sn 2018zd: an unusual stellar explosion as part of the diverse type ii supernova landscape |
using the nanten2 observatory, we carried out a molecular-line study of high-mass star forming regions with reflection nebulae, ngc 2068 and ngc 2071, in orion in the $^{13}$ co( $j = 2$ -1) transition. the $^{13}$ co distribution shows that there are two velocity components at ${9.0}$ and ${10.5}\:$ km $\:$ s $^{-1}$ ... | high-mass star formation in orion possibly triggered by cloud-cloud collision. iii. ngc 2068 and ngc 2071 |
it is widely believed that super-eddington accretion flow can produce powerful outflow, but where does this originate and how much mass and energy are carried away in which directions? to answer these questions, we perform a new large-box, two-dimensional radiation hydrodynamic simulation, paying special attention lest... | the origins and impact of outflow from super-eddington flow |
at least one in five of all planetary nebulae are the product of a common envelope (ce) interaction, where the companion in-spirals into the envelope of an asymptotic giant branch (agb) star ejecting the nebula and leaving behind a compact binary. in this work we carry out 3d smoothed particle hydrodynamics simulations... | common envelope binary interaction simulations between a thermally pulsating agb star and a low mass companion |
hydrogen and deuterium isotopic evidence indicates that the source of terrestrial water was mostly meteorites, with additional influx from nebula gas during accretion. there are two earth models, with large (7-12 ocean masses) and small (1-4 ocean masses) water budgets that can explain the geochemical, cosmochemical, a... | hydration and dehydration in earth's interior |
context. models of the young solar nebula assume a hot initial disk in which most volatiles are in the gas phase. water emission arising from within 50 au radius has been detected around low-mass embedded young stellar objects. the question remains whether an actively accreting disk is warm enough to have gas-phase wat... | volatile snowlines in embedded disks around low-mass protostars |
context. we have modelled the abundance distribution and ir emission of the first 3 members of the coronene family in the north-west photodissociation region of the well-studied reflection nebulae ngc 7023.aims: our aim was 3-fold: i) analyze the distribution of abundances; (ii) examine the spectral footprints from the... | hydrogenation and dehydrogenation of interstellar pahs: spectral characteristics and h2 formation |
we present the discovery of a slowly evolving, extragalactic radio transient, first j141918.9+394036, identified by comparing a catalog of radio sources in nearby galaxies against new observations from the very large array sky survey. analysis of other archival data shows that first j141918.9+394036 faded by a factor o... | discovery of the luminous, decades-long, extragalactic radio transient first j141918.9+394036 |
context. the vela ob2 association is a group of ∼10 myr stars exhibiting a complex spatial and kinematic substructure. the all-sky gaia dr2 catalogue contains proper motions, parallaxes (a proxy for distance), and photometry that allow us to separate the various components of vela ob2.aims: we characterise the distribu... | a ring in a shell: the large-scale 6d structure of the vela ob2 complex |
to what degree the cluster environment influences the sizes of protoplanetary disks surrounding young stars is still an open question. this is particularly true for the short-lived clusters typical for the solar neighborhood, in which the stellar density and therefore the influence of the cluster environment change con... | cluster dynamics largely shapes protoplanetary disk sizes |
context. we wish to improve our understanding of the orion central star formation region (orion-kl) and disentangle its complexity.aims: we collected data with alma during cycle 2 in 16 ghz of total bandwidth spread between 215.1 and 252.0 ghz with a typical sensitivity of 5 mjy/beam (2.3 mjy/beam from 233.4 to 234.4 g... | the complexity of orion: an alma view. i. data and first results |
copper isotope compositions in cu-bearing metals and minerals have been measured by deep (194 nm) ultraviolet femtosecond laser ablation multi-collector inductively coupled plasma mass spectrometry (uv-fsla-mc-icp-ms). pure cu-metal, brass, and several cu-rich minerals (chalcopyrite, enargite, covellite, malachite and ... | matrix and energy effects during in-situ determination of cu isotope ratios by ultraviolet-femtosecond laser ablation multicollector inductively coupled plasma mass spectrometry |
aims. we investigate the role of photo-evaporation of dust exposed to the radiation field from hot young stars and planetary nebulae (pne) as a possible destruction mechanism of dust grains in the interstellar medium (ism). methods. we estimate photo-evaporation induced by the feedback of individual or clustered young ... | dust survival in harsh environments -- is photo-evaporation an important destruction mechanism? |
the build up of heavy elements and the stellar mass assembly are fundamental processes in the formation and evolution of galaxies. although they have been extensively studied through observations and simulations, the key elements that govern these processes, such as gas accretion and outflows, are not fully understood.... | merger-driven infall of metal-poor gas in luminous infrared galaxies: a deep dive beneath the mass-metallicity relation |
during the first four all-sky surveys erass:4 carried out from december 2019 to 2021, the extended roentgen survey with an imaging telescope array (erosita) on board spektrum-roentgen-gamma (spektr-rg, srg) observed the galactic hii region carina nebula. we analysed the erass:4 data to study the distribution and the sp... | erosita studies of the carina nebula |
high-resolution spectroscopy of the core of the perseus cluster of galaxies, using the hitomi satellite above 2 kev and the xmm-newton reflection grating spectrometer at lower energies, provides reliable constraints on the abundances of o, ne, mg, si, s, ar, ca, cr, mn, fe, and ni. accounting for all known systematic u... | constraints on the chemical enrichment history of the perseus cluster of galaxies from high-resolution x-ray spectroscopy |
we present ultraviolet, optical, and near-infrared observations of sn 2012ap, a broad-lined type ic supernova in the galaxy ngc 1729 that produced a relativistic and rapidly decelerating outflow without a gamma-ray burst signature. photometry and spectroscopy follow the flux evolution from -13 to +272 days past the b-b... | the broad-lined type ic sn 2012ap and the nature of relativistic supernovae lacking a gamma-ray burst detection |
we present nirspec ifs observations of a galaxy group around the massive gs_4891 galaxy at z=3.7 in goods-south that includes two other two systems, gs_4891_n to the north and gs_28356 to the east. these observations, obtained as part of the gto ga-nifs program, allow for the first time to study the spatially resolved ... | ga-nifs: co-evolution within a highly star-forming galaxy group at z=3.7 witnessed by jwst/nirspec ifs |
we present nebular spectroscopy of sn 2020hvf, a type ia supernova (sn ia) with an early bump in its light curve. sn 2020hvf shares many spectroscopic and photometric similarities to the carbon-rich high-luminosity "03fg-like" sne ia. at >240 days after peak brightness, we detect unambiguous emission from [ca ii] λ ... | an asymmetric double-degenerate type ia supernova explosion with a surviving companion star |
we present results from daily monitoring of gamma-rays in the energy range from ∼0.5 to ∼100 tev with the first 17 months of data from the high altitude water cherenkov (hawc) observatory. its wide field of view of 2 steradians and duty cycle of > 95% are unique features compared to other tev observatories that allo... | daily monitoring of tev gamma-ray emission from mrk 421, mrk 501, and the crab nebula with hawc |
recently, frb 190520b, which has the largest extragalactic dispersion measure (dm), was discovered by the five-hundred-meter aperture spherical radio telescope (fast). the dm excess over the intergalactic medium and galactic contributions is estimated as ~900 pc cm-3, which is nearly ten times higher than that of other... | frb 190520b embedded in a magnetar wind nebula and supernova remnant: a luminous persistent radio source, decreasing dispersion measure, and large rotation measure |
context. the andromeda (m 31) galaxy displays several substructures in its inner halo. different simulations associate their origin with either a single relatively massive merger, or with a larger number of distinct, less massive accretions.aims: the origin of these substructures as remnants of accreted satellites or p... | the survey of planetary nebulae in andromeda (m 31). iii. constraints from deep planetary nebula luminosity functions on the origin of the inner halo substructures in m 31 |
planetary nebulae—the ejected envelopes of red giant stars—provide us with a history of the last, mass-losing phases of 90% of stars initially more massive than the sun. here we analyse images of the planetary nebula ngc 3132 from the james webb space telescope (jwst) early release observations. a structured, extended ... | the messy death of a multiple star system and the resulting planetary nebula as observed by jwst |
context. recent jwst observations of the type ia supernova (sn ia) 2021aefx in the nebular phase have paved the way for late-time studies covering the full optical to mid-infrared (mir) wavelength range, and with it the hope to better constrain sn ia explosion mechanisms.aims: we investigate whether public sn ia models... | nebular spectra from type ia supernova explosion models compared to jwst observations of sn 2021aefx |
ultra-high-energy (uhe, >0.1 pev) γ-ray astronomy is rapidly evolving into an expanding branch of γ-ray astronomy with the surprising discovery of 12 pevatrons and the detection of a handful of photons above 1 pev. nearly all known celestial object types that have emissions in the tev band are found also to emit uhe... | ultra-high-energy gamma-ray astronomy |
the infrared spectrograph (irs) on the spitzer space telescope observed nearly 800 point sources in the large magellanic cloud (lmc), taking over 1000 spectra. 197 of these targets were observed as part of the sage-spec spitzer legacy program; the remainder are from a variety of different calibration, guaranteed time a... | the sage-spec spitzer legacy program: the life-cycle of dust and gas in the large magellanic cloud. point source classification - iii |
we present an overview and the first data release of zfire, a spectroscopic redshift survey of star-forming galaxies that utilizes the mosfire instrument on keck-i to study galaxy properties in rich environments at 1.5 < z < 2.5. zfire measures accurate spectroscopic redshifts and basic galaxy properties derived ... | zfire: a keck/mosfire spectroscopic survey of galaxies in rich environments at z ∼ 2 |
t pyx is one of the most enigmatic recurrent novae, and it has been proposed as a potential galactic type-ia supernova progenitor. using spatially-resolved data obtained with muse, we characterized the geometrical distribution of the material expelled in previous outbursts surrounding the white dwarf progenitor. we use... | the physical properties of t pyx as measured by muse i. the geometrical distribution of the ejecta and the distance to the remnant |
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 |
angrites are silica-undersaturated achondrites formed very early in the history of the solar system, and the most volatile-depleted known meteorites. as such, the study of angrites can provide critical insights into the early stages of planetary formation, melting and differentiation. yet, understanding the origins of ... | the case for the angrite parent body as the archetypal first-generation planetesimal: large, reduced and mg-enriched |
geophysical and geochemical evidence suggests that earth's core is predominantly made of iron (or iron-nickel alloy) with several percent of light elements. however, earth's solid inner core transmits shear waves at a much lower velocity than expected from mineralogical models that are consistent with geochemical const... | strong shear softening induced by superionic hydrogen in earth's inner core |
the stratospheric observatory for infrared astronomy (sofia) is a boeing 747sp aircraft modified to accommodate a 2.7 meter gyro-stabilized telescope, which is mainly focused to studying the universe at infrared wavelengths. as part of the strategic director's discretionary time (s-ddt) program, sofia performs observat... | sofia community science i: hawc+ polarimetry of 30 doradus |
we model the radiatively driven flow from im lup - a large protoplanetary disc expected to be irradiated by only a weak external radiation field (at least 104 times lower than the ultraviolet field irradiating the orion nebula cluster proplyds). we find that material at large radii (>400 au) in this disc is sufficie... | first evidence of external disc photoevaporation in a low mass star forming region: the case of im lup |
the orion complex is a notable star-forming region fragmented into several different populations with substantial differences in their phase space. i propose a model that attempts to explain the how the complex has evolved into this current configuration. in the model presented here, the large-scale expansion can be at... | supernovae in orion: the missing link in the star-forming history of the region |
we analyze a keck i/low resolution imager and spectrograph nebular spectrum taken 268 days after b-band maximum of asassn-18bt (sn 2018oh), a type ia supernova observed by k2 at the time of explosion. asassn-18bt exhibited a two-component rise to peak brightness, possibly the signature of an interaction between the sup... | no stripped companion material in the nebular spectrum of the “two-component” type ia supernova asassn-18bt |
we present new optical spectra of the nearby, bright, planetary nebula ngc 6778. the nebula has been known to emit strong recombination lines for more than 40 years but this is the first detailed study of its abundances. heavy element abundances derived from recombination lines are found to exceed those from collisiona... | ngc 6778: strengthening the link between extreme abundance discrepancy factors and central star binarity in planetary nebulae |
recent work suggests that strong emission line, star-forming galaxies (sfgs) may be significant lyman continuum leakers. we combine archival hubble space telescope broadband ultraviolet and optical imaging (f275w and f606w, respectively) with emission line catalogs derived from wfc3 ir g141 grism spectroscopy to search... | the lyman continuum escape fraction of emission line-selected z ∼ 2.5 galaxies is less than 15% |
the extreme, time-variable faraday rotation observed in the repeating fast radio burst (frb) 121102 and its associated persistent synchrotron source demonstrates that some frbs originate in dense, dynamic, and possibly relativistic magneto-ionic environments. besides rotation of the linear polarization vector (faraday ... | faraday conversion and magneto-ionic variations in fast radio bursts |
circumstellar discs are the precursors of planetary systems and develop shortly after their host star has formed. in their early stages, these discs are immersed in an environment rich in gas and neighbouring stars, which can be hostile for their survival. there are several environmental processes that affect the evolu... | effects of stellar density on the photoevaporation of circumstellar discs |
the early stages of dynamical evolution of planetary systems are often shaped by dissipative processes that drive orbital migration. in multi-planet systems, convergent amassing of orbits inevitably leads to encounters with rational period ratios, which may result in establishment of mean-motion resonances. the success... | capture of planets into mean-motion resonances and the origins of extrasolar orbital architectures |
the luminosity of young giant planets can inform about their formation and accretion history. the directly imaged planets detected so far are consistent with the `hot-start' scenario of high entropy and luminosity. if nebular gas passes through a shock front before being accreted into a protoplanet, the entropy can be ... | thermodynamics of giant planet formation: shocking hot surfaces on circumplanetary discs |
the virgil fossae region on pluto exhibits three spatially coincident properties that are suggestive of recent cryovolcanic activity over an area approximately 300 by 200 km. situated in the fossae troughs or channels and in the surrounding terrain are exposures of h2o ice in which there is entrained opaque red-colored... | recent cryovolcanism in virgil fossae on pluto |
aims: we present a kinematic study of a sample of 298 planetary nebulas (pns) in the outer halo of the central virgo galaxy m 87 (ngc 4486). the line-of-sight velocities of these pns are used to identify subcomponents, to measure the angular momentum content of the main m 87 halo, and to constrain the orbital distribut... | kinematics of the outer halo of m 87 as mapped by planetary nebulae⋆ |
planetary embryos form protoplanets via mutual collisions, which can lead to the development of magma oceans. during their solidification, significant amounts of the mantles' volatile contents may be outgassed. the resulting h2o/co2 dominated steam atmospheres may be lost efficiently via hydrodynamic escape due to the ... | escape and fractionation of volatiles and noble gases from mars-sized planetary embryos and growing protoplanets |
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