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imaging in a broad light-intensity regime with a high signal-to-noise ratio is a key capability in fields as diverse as quantum metrology and astronomy. achieving high signal-to-noise ratios in quantum imaging leads to surpassing the classical limit in parameter estimation. in astronomical detection, the search for hab... | infrared photon-number-resolving imager using a skipper charge-coupled device |
many branches of science require infrared detectors sensitive to individual photons. applications range from low background astronomy to high speed imaging. leonardo in southampton, uk, has been developing hgcdte avalanche photodiode (apd) sensors for astronomy in collaboration with european southern observatory (eso) ... | leonardo (formerly selex es) infrared sensors for astronomy: present and future |
we present the the new swift/uvot+manga (swim) catalog (swim_v4.1). swim_v4.1 is designed to study star formation and dust attenuation within nearby galaxies given the unique overlap of swift/uvot near-ultraviolet (nuv) imaging and manga integral field optical spectroscopy. swim_v4.1 comprises 559 objects, ~4 times mor... | the new swift/uvot+manga (swim) value-added catalog |
solar observation is the branch of astronomy devoted to the study of the sun. when the light wavefront that comes from the sun penetrates the atmosphere, it suffers some distortions caused by optically turbulent layers that change the wavefront's shape and morphology. therefore, in order to obtain a good‑quality image,... | real‑time tomographic reconstructor based on convolutional neural networks for solar observation |
correcting atmospheric turbulence effects in light with adaptive optics is necessary, since it produces aberrations in the wavefront of astronomical objects observed with telescopes from earth. these corrections are performed classically with reconstruction algorithms; between them, neural networks showed good results.... | convolutional neural networks approach for solar reconstruction in scao configurations |
we have fabricated 2024 pixel microwave kinetic inductance detector (mkid) arrays in the ultraviolet/optical/near-ir (uvoir) regime that are currently in use in astronomical instruments. in order to make mkids desirable for novel instruments, larger arrays with nearly perfect yield need to be fabricated. as array size ... | ultraviolet, optical, and near-ir microwave kinetic inductance detector materials developments |
we obtained optical spectra of the recurrent nova m31n 2008-12a during its ongoing outburst (atel #15786, #15787, #15788, #15789 ) on 2022-12-03 and 2022-12-04 covering a wavelength range of 3800-8000 angstorm, using the low-resolution hfosc instrument mounted on the 2-m himalayan chandra telescope (hct) of the indian ... | hct optical spectroscopy of the 2022 outburst of recurrent nova m31n 2008-12a |
over the past decades, the achievements in astronomical instrumentation have given rise to a number of novel advanced studies related to the analysis of large arrays of observational data. one of the most famous of these studies is a study of transient events in the near and far space and a search for exoplanets. the m... | explanation: exoplanet and transient event investigation project—optical facilities and solutions |
we present a miniaturized and wide field-of-view x-ray and gamma-ray imager consisting of a segmented 2d optics-collimator coupled to the high-sensitivity semiconductor pixel detector timepix equipped with a high-z sensor (cdte 2000 μm thick). the compact payload has been deployed in low-earth orbit (leo) onboard the 3... | directional-sensitive x-ray/gamma-ray imager on board the vzlusat-2 cubesat for wide field-of-view observation of grbs in low earth orbit |
cdte/czt based spectroscopic two-dimensional (2d)/three-dimensional (3d) imagers when operated in the compton regime can work as high performance scattering polarimeters, for high-energy astrophysics. polarimetry in high-energy astrophysics has been little explored. to date, x- and γ-ray source emissions have been stud... | hard x-ray and soft gamma ray polarimetry with cdte/czt spectro-imager |
in recent years, gravitational wave observatories have conquered the world science scene due to their unprecedented capability to observe astrophysical signals. those first observations opened up multimessenger astronomy and called for a tremendous r&d effort to improve the sensitivity of future detectors. one of t... | cryogenic vacuum considerations for future gravitational wave detectors |
following earlier proposals for optical stellar interferometer concepts in space and on the moon, the improved `hypertelescope' version capable of direct high-resolution imaging with a high limiting magnitude became tested on earth, proposed for space, and is now also proposed for the moon. many small mirrors can be di... | lunar optical interferometry and hypertelescope for direct imaging at high resolution |
over the last few years, the eso's elt has made tremendous progress in defining and procuring the many components of one of the future world largest optical-infrared telescopes. more than two dozen large scale contracts have been placed to industry to design and manufacture several items, among them the dome, the teles... | the eso's elt construction status |
the imaging x-ray polarimetry explorer, a nasa small explorer mission, will be the first mission dedicated to x-ray polarimetry. the payload consists of three identical telescopes, each comprising a mirror module assembly (mma) with a polarization-sensitive detector at its focus. we describe all aspects of the mma, fro... | optics for the imaging x-ray polarimetry explorer |
pmoired models astronomical spectro-interferometric data stored in the oifits format. parametric modeling is used to describe the observed scene as blocks such as disks, rings and gaussians which can be combined and their parameters linked. it includes plotting, least-square fitting and bootstrapping estimation of unce... | pmoired: parametric modeling of optical interferometric data |
aims: we wish to improve the accuracy of oscillator strength values for several ni ii uv transitions and measure for the first time the f-value of a few other weak transitions for which no laboratory nor astronomical measurement is presently available.methods: four quasars displaying five damped lyman α systems with re... | improved ni ii oscillator strengths from quasar absorption systems |
remote polarization studies are a very powerful method of solving of astronomical tasks with the study of the physical properties of the planets and their atmospheres. it allows research of objects as in situ, so in vitro, and has many other advantages. to use this method has already been developed and are continuing t... | the ability to use remote polarization studies of earth from space in the national economy (project of the onboard filter panoramic polarimeter) |
i report the detection of linear x-ray features associated with psr b2224+65, based on a new chandra observation, plus two obtained ∼6 and 12 yr earlier. this mid-aged pulsar is known for its extreme proper motion and its associated guitar-shaped optical nebula in the opposite direction. the main jet-like feature with ... | x-ray jet, counter-jet, and trail of the fast-moving pulsar psr b2224+65 |
context. in 2015, the international astronomical union (iau) passed resolution b3, which defined a set of nominal conversion constants for stellar and planetary astronomy. resolution b3 defined a new value of the nominal solar radius (r⊙n = 695 700 km km) that is different from the canonical value used until now (695 9... | solar radius determined from picard/sodism observations and extremely weak wavelength dependence in the visible and the near-infrared |
in view of the scarcity of terahertz astronomical point source targets, this paper studies the method of using a small optical telescope coaxial with terahertz antenna to assist the pointing measurement of terahertz telescope and establish the pointing error correction model. based on the 1.2 m oblique axis terahertz a... | study on the pointing error model of terahertz telescopes with optically assisted pointing measurements |
the point spread function (psf) for astronomical telescopes and instruments depends not only on geometric aberrations and scalar wave diffraction, but also on the apodization and wavefront errors introduced by coatings on reflecting and transmitting surfaces within the optical system. the functional form of these aberr... | polarization aberration in astronomical telescopes |
we present high spectral resolution (∼3 km s-1) observations of the {{ν }2} ro-vibrational band of h2o in the 6.086-6.135 μm range toward the massive protostar afgl 2591 using the echelon-cross-echelle spectrograph (exes) on the stratospheric observatory for infrared astronomy (sofia). ten absorption features are detec... | sofia/exes observations of water absorption in the protostar afgl 2591 at high spectral resolution |
graphene hot-electron bolometer (heb) detectors, with weak electron-phonon interaction and a wide working temperature range, are of particular interest for terahertz (thz) applications including astronomy. in this paper, we report on the performance of a zero-biased thz heb detector using johnson noise thermometry base... | demonstration of a high-sensitivity and wide-dynamic-range terahertz graphene hot-electron bolometer with johnson noise thermometry |
this review encompasses the current state of development of optical/ir energy-sensitive detectors with reference to both the earliest implementations of energy sensitive detector technology, and current development projects with a discussion of their future developmental potential. the review will focus mainly on detec... | energy-sensitive detectors for astronomy: past, present and future |
segmented telescopes and multi-aperture telescopes are effective ways to realize high-resolution observations in astronomy. an important work for the high-resolution observations with segmented telescopes and multi-aperture telescopes is phasing the multiple segmented mirrors or sub-apertures. modified shack-hartmann s... | the piston error recognition technique used in the modified shack-hartmann sensor |
a digital micromirror device (dmd) is a technology developed by texas instruments, that consists in a two-dimensional array of micromirrors, which can be individually tilted between two positions. it has been used as a digital video and image processing solution, commonly found in digital light processing (dlp) video p... | characterization of light diffraction by a digital micromirror device |
the km3net research infrastructure is under construction in the mediterranean sea. km3net will study atmospheric and astrophysical neutrinos with two multi-purpose neutrino detectors, arca and orca, primarily aimed at gev-pev neutrinos. thanks to the multi-photomultiplier tube design of the digital optical modules, km3... | implementation and first results of the km3net real-time core-collapse supernova neutrino search |
since its launch in 1999, the xmm-newton mission has compiled the largest catalogue of serendipitous x-ray sources, with the 3xmm being the third version of this catalogue. this was possible thanks to the combination of a large effective area (5000 cm2 at 1 kev) and a wide field of view (30 arcmin). the 3xmm-dr6 catalo... | a search for x-ray absorbed sources in the 3xmm catalogue using photometric redshifts and bayesian spectral fits |
instrumentation for observing occultations of stars by solar system bodies and its parameters are described. the complex is designed for observations at the azt-2 telescope (d = 70 cm, f = 10.5 m) of the main astronomical observatory of the national academy of sciences of ukraine (mao nasu); it is equipped with an opti... | observation of stellar occultations by asteroid (259) alethea and comet 21p/jacobini-zinner |
aside from the well-studied sodium doublet, the potassium d lines are the only optical emissions in mercury's exosphere that are amply bright to contrast with the dayside disk. measurements of the k exosphere are limited compared to na, but the k regolith abundance is better constrained, so new insights may help to und... | the spatial distribution and temperature of mercury's potassium exosphere |
we designed depth-graded multilayers, so-called supermirrors, with platinum/carbon (pt/c) layer pairs for the hard x-ray telescope (hxt) that was on-board the sixth japanese x-ray astronomy satellite hitomi (astro-h). the hxt has multinested thin foil optics, and the grazing angles of the x-ray mirrors are 0.07 to 0.27... | supermirror design for hard x-ray telescopes on-board hitomi (astro-h) |
the toliman space telescope is a low-cost, agile mission concept dedicated to astrometric detection of exoplanets in the near-solar environment, and particularly targeting the alpha cen system. although successful discovery technologies are now populating exoplanetary catalogs into the thousands, contemporary astronomy... | the toliman space telescope |
egb 6 is an extended, faint old planetary nebula (pn) with an enigmatic nucleus. the central star (pg 0950+139) is a hot daoz-type white dwarf (wd). an unresolved, compact emission knot was discovered to be located 0.''166 away from the wd and it was shown to be centered around a dust-enshrouded low-luminosity star. it... | the hot white dwarf in the peculiar binary nucleus of the planetary nebula egb 6 |
correlated color temperature (cct) is a semi-quantitative system that roughly describes the spectra of lamps. this parameter gives the temperature (measured in kelvins) of the black body that would show the hue more similar to that of the light emitted by the lamp. modern lamps for indoor and outdoor lighting display m... | beyond cct: the spectral index system as a tool for the objective, quantitative characterization of lamps |
we provide an update on the construction status of the daniel k. inouye solar telescope. this 4-m diameter facility is designed to enable detection and spatial/temporal resolution of the predicted, fundamental astrophysical processes driving solar magnetism at their intrinsic scales throughout the solar atmosphere. the... | construction status of the daniel k. inouye solar telescope |
a wide field-of-view (fov) is one of the most important goals for future ground-based γ-ray astronomy, and it is especially crucial for detailed studies of temporal and spectral characteristics of solitary events, such as γ-ray bursts (grbs), highly variable sources like blazars, or potential very high energy (vhe) ele... | performance of a wide field-of-view atmospheric cherenkov telescope prototype based on a refractive lens |
in the next decades, the astrobiological community will debate whether the first observations of oxygen in an exoplanet's atmosphere signify life, so it is critical to establish procedures now for collection and interpretation of such data. we present a step-by-step observational strategy for using oxygen as a robust b... | a geologically robust procedure for observing rocky exoplanets to ensure that detection of atmospheric oxygen is a modern earth-like biosignature |
we present optical observations of supernova (sn) 2014ek, discovered during the tsinghua university-national astronomical observatories, chinese academy of sciences (naoc) transient survey (tnts), which shows properties that are consistent with those of sn 2002cx-like events (dubbed as sne iax). the photometry indicate... | optical observations of the 2002cx-like supernova 2014ek and characterizations of sne iax |
the feynman path integral formalism has long been used for calculations of probability amplitudes. over the last few years, it has been extensively used to theoretically demonstrate that the usual application of the superposition principle in slit based interference experiments is often incorrect. this has caveat in bo... | measuring the deviation from the superposition principle in interference experiments |
the wide-area linear optical polarimeter (walop)-south instrument will be mounted on the 1-m south african astronomical observatory telescope in south africa as part of the polar-areas stellar imaging polarization high accuracy experiment (pasiphae) program to carry out a linear imaging polarization survey of the galac... | walop-south: a four-camera one-shot imaging polarimeter for pasiphae survey. paper i—optical design |
we report the discovery of a quasar, sdss j125809.31+351943.0 (j1258), which brightened in optical wavelengths for 4 mag from 1983 to 2015: one of the largest quasar brightening events so far. the history of optical photometry data of this quasar from the catalina real-time transient survey and all sky automated survey... | discovery of a new extreme changing-state quasar with 4 mag variation, sdss j125809.31+351943.0 |
not available based in part on observations taken at the cerro tololo inter-american observatory, national optical astronomy observatory, which is operated by the association of universities for research in astronomy, inc. (aura) under cooperative agreement with the national science foundation. | optical and infrared photometry of sn 2005df |
at present, the principal limitation on the resolution and contrast of astronomical imaging instruments comes from aberrations in the optical path, which may be imposed by the earth's turbulent atmosphere or by variations in the alignment and shape of the telescope optics. these errors can be corrected physically, with... | the palomar kernel-phase experiment: testing kernel phase interferometry for ground-based astronomical observations |
optical interferometers may not require a phase-stable optical link between the stations if instead sources of quantum-mechanically entangled pairs could be provided to them, enabling long baselines. we developed a new variation of this idea, proposing that photons from two different astronomical sources could be inter... | astrometry in two-photon interferometry using an earth rotation fringe scan |
we study the prospects of detecting continuous gravitational waves (cgws) from spinning neutron stars (nss), gravitationally lensed by the galactic supermassive black hole. assuming various astrophysically motivated spatial distributions of galactic nss, we find that cgw signals from a few (~0-6) neutron stars should b... | prospects for the observation of continuous gravitational waves from spinning neutron stars lensed by the galactic supermassive black hole |
with the rise of neutrino astronomy using large-volume detector arrays, calibration improvements of optical media and photosensors have emerged as significant means to reduce detector systematics. to improve understanding of the detector volume and its instrumentation, we developed an absolutely-calibrated, self-monito... | a self-monitoring precision calibration light source for large-volume neutrino telescopes |
we have used the habitable zone planet finder (hpf) to gather high-resolution, high signal-to-noise near-infrared spectra of 13 field red horizontal branch (rhb) stars, one open cluster giant, and one very metal-poor halo red giant. the hpf spectra cover the 0.81-1.28 μm wavelength range of the zyj bands, partially fil... | chemical compositions of red giant stars from habitable zone planet finder spectroscopy |
excalibur is a nonparametric, hierarchical framework for precision wavelength calibration of spectrographs. it is designed with the needs of extreme-precision radial-velocity (eprv) instruments in mind, which require calibration or stabilization to better than 10-4 pixels. instruments vary along only a few dominant deg... | excalibur: a nonparametric, hierarchical wavelength calibration method for a precision spectrograph |
we report on a tapered three-core optical fibre that can be used as a tip-tilt wavefront sensor. in this device, a coupled region of a few millimetres at the sensing tip of the fibre converts fragile phase information from an incoming wavefront into robust intensity information within each of the cores. the intensity i... | all-fibre wavefront sensor |
we present a machine-learning framework to accurately characterize the morphologies of active galactic nucleus (agn) host galaxies within z < 1. we first use psfgan to decouple host galaxy light from the central point source, then we invoke the galaxy morphology network (gamornet) to estimate whether the host galaxy... | using machine learning to determine morphologies of z < 1 agn host galaxies in the hyper suprime-cam wide survey |
in this paper we present a two-step neural network model to separate detections of solar system objects from optical and electronic artifacts in data obtained with the "asteroid terrestrial-impact last alert system" (atlas), a near-earth asteroid sky survey system. a convolutional neural network is used to classify sma... | a two-stage deep learning detection classifier for the atlas asteroid survey |
context. the zone of avoidance (zoa) does not allow for clear optical observations of extragalactic sources behind the milky way due to the meaningful extinction of the optical emission of these objects. observations in near-infrared (nir) wavelengths represent a potential source of astronomical discoveries that suppor... | unveiling a new extragalactic structure hidden by the milky way |
esa's next large x-ray mission athena will be equipped with two focal plane cameras, a wide field imager (wfi) and an x-ray integral field unit (x-ifu). the wfi instrument is designed for imaging and spectroscopy over a large field of view, and high count rate observations up to and beyond 1 crab source intensity. both... | the wide field imager instrument for athena |
context. the potentially hazardous asteroid (85990) 1999 jv6 has been a target of previously published thermal-infrared observations and optical photometry. it has been identified as a promising candidate for possible yarkovsky-o'keefe-radzievskii-paddack (yorp) effect detection.aims: the yorp effect is a small thermal... | shape model and spin-state analysis of pha contact binary (85990) 1999 jv6 from combined radar and optical observations |
following up on our discovery of terahertz water masers, reported in 2017, we report two further detections of water maser emission at frequencies above 1 thz. using the great instrument on sofia, we have detected emission in the 1.296411 thz 827 - 734 transition of water toward two additional oxygen-rich evolved stars... | terahertz water masers. ii. further sofia/great detections toward circumstellar outflows, and a multitransition analysis |
latest advances in charged coupled devices (ccd) allowed the implementation of dense mesh fireball networks. along with meteor studies, long term analysis of all-sky sequences of calibration captures can provide us with the number of nights we can use for astronomical observations, the number of photometric nights, how... | photometric calibration of moroi all-sky cameras: introduction and first results |
the mid-infrared (mid-ir) is a spectral region (≈2 to 20 μm) that is of key importance in astronomy for applications such as exoplanet imaging and spectroscopic analysis. long baseline stellar interferometry is the only imaging technique that offers the possibility to achieve milli-arcsecond angular resolution in the m... | development of low-loss mid-infrared ultrafast laser inscribed waveguides |
since the idea of bionic lobster eye micropore optics was put forward, the possibility of focusing hard x-rays by this new lightweight x-ray optics has been proposed. limited by the technological conditions of the aspect ratio (≥500), low surface roughness (≤1 nm) and the difficulty of applying metal coatings inside su... | fabrication and performance of lobster eye x-ray micro pore optics with the ultra-high aspect ratio |
in astronomy, the demand for high-resolution imaging and high-efficiency observation requires telescopes that are maintained at peak performance. to improve telescope performance, it is useful to conduct real-time monitoring of the telescope status and detailed recordings of the operational data of the telescope. in th... | telescope performance real-time monitoring based on machine learning |
we present a study of saturn's h3+ northern auroral emission using data from 19 may 2013 from the very large telescope's long-slit spectrometer cryogenic infrared echelle spectrograph (vlt-crires). adaptive optics, combined with the spectral resolution of vlt-crires (<mfrac>λδλ</mfrac>∼100,000), offers unpr... | exploring key characteristics in saturn's infrared auroral emissions using vlt-crires: h3+ intensities, ion line-of-sight velocities, and rotational temperatures |
a four-year sky survey with the use of the erosita telescope on board the spektr-rg observatory with focusing optics will provide the best coverage in the soft (0.5-2 kev) and standard (2-10 kev) x-ray ranges, both in terms of sensitivity and angular resolution. we have investigated the possibility of detecting various... | observability of single neutron stars at srg/erosita |
we present effective collision strengths for electron excitation and de-excitation of the 10 forbidden transitions between the five lowest energy levels of the astronomically abundant doubly ionized oxygen ion, o2+. the raw collision strength data were obtained from an r-matrix intermediate coupling calculation using t... | effective collision strengths for excitation and de-excitation of nebular [o iii] optical and infrared lines with κ distributed electron energies |
we observed a partial transit of the ultra-hot jupiter wasp-189 b with pepsi on the lbt. we detect a highly variable transit signal in multiple atomic transitions, including h-alpha, fe i, and mg i. the signal is not consistent with a transiting planetary atmosphere. we suggest instead that the in-transit signal is due... | no consistent atmospheric absorption detected for the ultra-hot jupiter wasp-189 b |
we are developing superconducting microwave kinetic inductance detectors to operate at near infrared and optical wavelengths for astronomy. in order to efficiently meet with the requirements of astronomical applications, we propose to replace the interdigitated capacitor by a metal-insulator-metal capacitor which has t... | design of near infrared and visible kinetic inductance detectors using mim capacitors |
spupnic (spectrograph upgrade: newly improved cassegrain) is the extensively upgraded cassegrain spectrograph on the south african astronomical observatory's 74-inch (1.9-m) telescope. the inverse-cassegrain collimator mirrors and woefully inefficient maksutov-cassegrain camera optics have been replaced, along with the... | spupnic (spectrograph upgrade: newly improved cassegrain) on the south african astronomical observatory's 74-inch telescope |
similarities exist between the infrared spectra of diamondoids and unidentified infrared emission bands seen in the spectra of young stars with circumstellar disks. due to their low ionization energy and absorption in the visible range, the radical cations of these highly stable molecules are also suggested to contribu... | optical spectrum of the diamantane radical cation |
the recent discovery of the electromagnetic counterpart of the gravitational wave source gw170817 has demonstrated the huge informative power of multi-messenger observations. late '20s and early '30s will be a mature era for multi-messenger astronomy. consolidated network of second generation gravitational wave detecto... | theseus in the era of multi-messenger astronomy . |
this paper describes integral field unit (ifu) spectroscopic observations of the galactic planetary nebula (pn) ngc 2792. the physical conditions, chemical composition, and kinematic properties are discussed and found to be in good agreement with prior long-slit-based investigations. the intensity of the he ii line ind... | comprehensive study of the galactic planetary nebula ngc 2792 |
recent advances in unmanned aerial vehicle (uav) technology have made uavs an attractive possibility as an airborne calibration platform for astronomical facilities. this is especially true for arrays of telescopes spread over a large area such as the cherenkov telescope array (cta). in this paper, the feasibility of u... | on the prospects of cross-calibrating the cherenkov telescope array with an airborne calibration platform |
aims: we present an analysis of archival spitzer images and new ground-based and hubble space telescope (hst) near-infrared (ir) and optical images of the field of m 83 with the goal of identifying rare, dusty, evolved massive stars.methods: we present point source catalogs consisting of 3778 objects from spitzer infra... | the infrared massive stellar content of m 83 |
this paper reviews atoms and ions in the upper atmosphere, including the mesospheric metals na, fe, mg$^+$, si$^+$, ca$^+$, k and also non-metallic species n, n$^+$, o, h, considering their potential for astronomical adaptive optics. na and fe are the best candidates for the creation of polychromatic laser guide stars,... | atomic transitions for adaptive optics |
silicon photomultipliers (sipms) offer advantages such as lower relative cost, smaller size, and lower operating voltages compared to photomultiplier tubes. a sipm's readout circuit topology can significantly affect the characteristics of an imaging array. in nuclear imaging and detection, energy, timing, and position ... | a comprehensive survey of readout strategies for sipms used in nuclear imaging systems |
local infrared (ir) luminosity functions (lfs) are necessary benchmarks for high-redshift ir galaxy evolution studies. any accurate ir lf evolution studies require accordingly accurate local ir lfs. we present ir galaxy lfs at redshifts of z ≤ 0.3 from akari space telescope, which performed an all-sky survey in six ir ... | the infrared luminosity function of akari 90 μm galaxies in the local universe |
in-orbit experience has shown that soft protons are funneled more efficiently through focusing wolter-type optics of x-ray observatories than simulations predicted. these protons can degrade the performance of solid-state x-ray detectors and contribute to the instrumental background. since laboratory measurements of th... | soft proton scattering efficiency measurements on x-ray mirror shells |
recent advances in time-domain astronomy have uncovered a new class of optical transients with time-scales shorter than typical supernovae and a wide range of peak luminosities. several subtypes have been identified within this broad class, including ca-rich transients, type ia supernovae (sne ia) and fast/bright trans... | white dwarf dynamical interactions and fast optical transients |
we present an analysis of a slightly eccentric (e = 0.05), partially eclipsing, long-period (p = 69.73 days) main-sequence binary system (wocs 12009, sanders 1247) in the benchmark old open cluster m67. using kepler k2 and ground-based photometry, along with a large set of new and reanalyzed spectra, we derived highly ... | the k2 m67 study: a curiously young star in an eclipsing binary in an old open cluster |
wavefront sensors (wfss) encode phase information of an incoming wavefront into an intensity pattern that can be measured on a camera. several kinds of wfss are used in astronomical adaptive optics. among them, fourier-based wfss perform a filtering operation on the wavefront in the focal plane. the most well-known exa... | adaptive optics with programmable fourier-based wavefront sensors: a spatial light modulator approach to the lam/onera on-sky pyramid sensor testbed |
we report optical photometric observations of the 2016 outburst of m31n 2008-12a, which was recently discovered with the 50 cm telescope at the itagaki astronomical observatory (see atel #9848). | recurrent nova m31n 2008-12a: optical photometric follow up |
the blast observatory is a proposed super-pressure balloon-borne polarimeter designed for a future ultra- long duration balloon campaign from wanaka, new zealand. to maximize scientific output while staying within the stringent super-pressure weight envelope, blast will feature new 1.8m off-axis optical system containe... | the balloon-borne large aperture submillimeter telescope observatory |
optical fibers have altered astronomical instrument design by allowing for a complex, often large instrument to be mounted in a remote and stable location with respect to the telescope. the fibers also enable the possibility to rearrange the signal from a focal plane to form a psuedo-slit at the entrance to a spectrogr... | astronomical applications of multi-core fiber technology |
the origin of gev emission from the early epoch of gamma-ray bursts (grbs) is a widely discussed issue. the long gamma-ray burst grb 170405a, observed by the fermi gamma-ray space telescope, showed high-energy emission delayed by ∼20 s with respect to the x-ray emission, followed by temporally fading gamma-ray emission... | physical origin of gev emission in the early phase of grb 170405a: clues from emission onsets with multiwavelength observations |
aims: the role of episodic mass loss is one of the outstanding questions in massive star evolution. the structural inhomogeneities and kinematics of their nebulae are tracers of their mass-loss history. we conduct a three-dimensional morpho-kinematic analysis of the ejecta of η car outside its famous homunculus nebula.... | dissecting a supernova impostor's circumstellar medium: museing about the shape of η carinae's outer ejecta |
context. the role of mass and momentum exchanges in close massive binaries is very important in the subsequent evolution of the components. such exchanges produce several observational signatures such as asynchronous rotation and altered chemical compositions, that remain after the stars detach again.aims: we investiga... | observational signatures of past mass-exchange episodes in massive binaries: the case of lss 3074 |
optical and near-infrared observations are compiled for the three gamma-ray binaries hosting be stars: psr b1259‑63, lsi+61 303, and hess j0632+057. the emissions from the be disk are considered to vary according to the changes in its structure, some of which are caused by interactions with the compact object (e.g., ti... | optical and near-infrared monitoring of gamma-ray binaries hosting be stars |
in february 2014, the yale exoplanet laboratory was commissioned to design, build, and deliver a high resolution (r=60,000) spectrograph for the 1.65m telescope at the molėtai astronomical observatory. the observatory is operated by the institute of theoretical physics and astronomy at vilnius university. the vilnius u... | design and construction of vues: the vilnius university echelle spectrograph |
we present results of high-cadence monitoring of the optical light curve of the nearby, type ia sn 2014j in m 82, using the 2.3 m aristarchos telescope. b and v-band photometry on days 15-18 after tmax(b) was obtained with a cadence of 2 min per band, revealing evidence for rapid variability at the 0.02-0.05 mag level ... | evidence for rapid variability in the optical light curve of the type ia sn 2014j |
we present optical photometry and spectroscopy of the optical transient sn 2011a. our data span 140 days after discovery including {bvri} u\prime g\prime r\prime i\prime z\prime photometry and 11 epochs of optical spectroscopy. originally classified as a type iin supernova (sn iin) due to the presence of narrow hα emis... | sn 2011a: a low-luminosity interacting transient with a double plateau and strong sodium absorption |
aims: we present and study the spectroscopic and photometric evolution of the type ia supernova (sn ia) 2010ev.methods: we obtain and analyze multiband optical light curves and optical/near-infrared spectroscopy at low and medium resolution spanning -7 days to +300 days from the b-band maximum.results: a photometric an... | supernova 2010ev: a reddened high velocity gradient type ia supernova |
the chinese space station telescope (csst) is a cutting-edge two-meter astronomical space telescope currently under construction. its primary survey camera (sc) is designed to conduct large-area imaging sky surveys using a sophisticated seven-band photometric system. the resulting data will provide unprecedented data f... | the first comprehensive milky way stellar mock catalogue for the chinese space station telescope survey camera |
abstract—the nearby dwarf galaxy ngc 3077 is known for its peculiar morphology, which includes numerous dust lanes and emission-line regions. the interstellar medium in this galaxy is subject to several perturbing factors. these are primarily the central starburst and tidal structures in the m81 group. we present a com... | ionized gas in the ngc 3077 galaxy |
observations with ground-based telescopes are affected by differential atmospheric dispersion due to the wavelength-dependent index of refraction of the atmosphere. the usage of an atmospheric dispersion corrector (adc) is fundamental to compensate this effect. atmospheric dispersion correction residuals above the leve... | on-sky measurements of atmospheric dispersion - i. method validation |
context. hd 93129a was classified as the earliest o-type star in the galaxy (o2 if*) and is considered as the prototype of its spectral class. however, interferometry shows that this object is a binary system, while recent observations even suggest a triple configuration. none of the previous spectral analyses of this ... | the extreme o-type spectroscopic binary hd 93129a. a quantitative, multiwavelength analysis |
knowledge of the stellar content near the sun is important for a broad range of topics ranging from the search for planets to the study of milky way (mw) structure. the most powerful method for identifying potentially nearby stars is proper motion (pm) surveys. all old optical surveys avoid, or are at least substantial... | vvv high proper motion stars - i. the catalogue of bright ks ≤ 13.5 stars |
an active stage of relativistic astrophysics started in 1963 since in this year, quasars were discovered, kerr solution had been found and the first texas symposium on relativistic astrophysics was organized in dallas. five years later, in 1967-1968 pulsars were discovered and their model as rotating neutron stars (nss... | tests of gravity theories with galactic center observations |
we present a uv study of 3 extended uv (xuv) galaxies that we have observed with the uvit and the gmrt. xuv galaxies show filamentary or diffuse star formation well beyond their optical disks, in regions where the disk surface density lies below the threshold for star formation. galex observations found that surprising... | a comparison of the uv and hi properties of the extended uv (xuv) disk galaxies ngc 2541, ngc 5832 and eso406-042 |
sitelle, an imaging fourier transform spectrometer, is part of the canada-france-hawaii instrument suite. it delivers spectral cubes covering an 11 arcmin × 11 arcmin field of view with a seeing-limited spatial resolution and a tunable spectral resolution (r ~ 1-10 000) in selected bands of the visible range (350-900 n... | data reduction and calibration accuracy of the imaging fourier transform spectrometer sitelle |
this paper presents optical night sky brightness measurements from the stratosphere using ccd images taken with the super-pressure balloon-borne imaging telescope (superbit). the data used for estimating the backgrounds were obtained during three commissioning flights in 2016, 2018, and 2019 at altitudes ranging from 2... | optical night sky brightness measurements from the stratosphere |
we announce the public release of 141,531 moderate-dispersion optical spectra of 72,247 objects acquired over the past 25 yr with the fast spectrograph on the fred l. whipple observatory 1.5 m tillinghast telescope. we describe the data acquisition and processing so that scientists can understand the spectra. we highli... | center for astrophysics optical infrared science archive. i. fast spectrograph |
galaxy clusters provide an excellent probe in various research fields in astrophysics and cosmology. however, the number of galaxy clusters detected so far in the akari north ecliptic pole (nep) field is limited. in this work, we provide galaxy cluster candidates in the akari nep field with the minimum requisites based... | optically detected galaxy cluster candidates in the akari north ecliptic pole field based on photometric redshift from the subaru hyper suprime-cam |
laser frequency microcombs provide equidistant coherent frequency markers over a broad spectrum, enabling new frontiers in chip-scale frequency metrology, laser spectroscopy, dense optical communications, precision distance metrology and astronomy. here we demonstrate thermally stabilized frequency microcomb formation ... | mapping ultrafast timing jitter in dispersion-managed 89 ghz frequency microcombs via self-heterodyne linear interferometry |
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