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we present the discovery of three sub-neptune-sized planets transiting the nearby and bright sun-like star hd 191939 (tic 269701147, toi 1339), a ks = 7.18 mag g8 v dwarf at a distance of only 54 pc. we validate the planetary nature of the transit signals by combining 5 months of data from the transiting exoplanet surv... | hd 191939: three sub-neptunes transiting a sun-like star only 54 pc away |
more than 5000 exoplanets have been confirmed and among them almost 4000 were discovered by the transit method. however, few transiting exoplanets have an orbital period greater than 100 days. here we report a transit detection of kepler-167 e, a "jupiter analog" exoplanet orbiting a k4 star with a period of 1071 days,... | a 16 hr transit of kepler-167 e observed by the ground-based unistellar telescope network |
in this paper, we present comprehensive night-time seeing statistics at the lenghu site using data collected between 2018 and 2021 using a differential image motion monitor. the results show that the median seeing is 0.80 arcsec, which slightly larger than that previously reported due to climate change. additionally, w... | astronomical seeing and wind speed distributions with era5 data at lenghu site on the tibetan plateau |
the registration of astronomical images, is one of the key technologies to improve the detection accuracy of small and weak targets during astronomical image-based observation. the error of registration has a great influence on the trace association of targets. however, most of the existing methods for point-matching a... | a registration algorithm for astronomical images based on geometric constraints and homography |
the coronagraphic high angular resolution imaging spectrograph (charis) is an integral field spectrograph (ifs) that has been built for the subaru telescope. charis has two imaging modes; the high-resolution mode is r82, r69, and r82 in j, h, and k bands respectively while the low-resolution discovery mode uses a secon... | laboratory testing and performance verification of the charis integral field spectrograph |
we used ultra-deep j and ksimages secured with the near-infrared (nir) gsaoi camera assisted by the multi-conjugate adaptive optics system gems at the gemini south telescope in chile, to obtain a (ks , j - ks ) color-magnitude diagram (cmd) for the bulge globular cluster ngc 6624. we obtained the deepest and most accur... | ultra-deep gemini near-infrared observations of the bulge globular cluster ngc 6624. |
this document summarizes the science cases related to cosmology studies with the maunakea spectroscopic explorer (mse), a highly-multiplexed (4332 fibers), wide fov (1.5 sq deg), large aperture (11.25 m in diameter), optical/nir (360nm to 1300nm) facility. the mse high-z cosmology survey is designed to probe a large vo... | cosmology with the maunakea spectroscopic explorer |
we present co(1-0) maps of 12 warm h2-selected hickson compact groups (hcgs), covering 14 individually imaged warm h2 bright galaxies, with the combined array for research in millimeter astronomy. we found a variety of molecular gas distributions within the hcgs, including regularly rotating disks, bars, rings, tidal t... | star formation suppression in compact group galaxies: a new path to quenching? |
we present extensive calculations of radiative transition rates and electron impact collision strengths for fe ii. the data sets involve 52 levels from the 3d7, 3d64s, and 3{d}54{s}2 configurations. computations of a-values are carried out with a combination of state-of-the-art multiconfiguration approaches, namely the... | atomic data and spectral model for fe ii |
the uv-optical variability of active galactic nuclei and quasars is useful for understanding the physics of the accretion disk and is gradually being attributed to stochastic fluctuations over the accretion disk. quasars generally appear bluer when they brighten in the uv-optical bands; the nature of this phenomenon re... | simulating the timescale-dependent color variation in quasars with a revised inhomogeneous disk model |
context. the imaging sharpness of an x-ray telescope is chiefly determined by the optical quality of its focusing optics, which in turn mostly depends on the shape accuracy and the surface finishing of the grazing-incidence x-ray mirrors that compose the optical modules. to ensure the imaging performance during the mir... | mirrors for x-ray telescopes: fresnel diffraction-based computation of point spread functions from metrology |
large ultra-sensitive detector arrays are needed for present and future observatories for far infra-red, submillimeter wave (thz), and millimeter wave astronomy. with increasing array size, it is increasingly important to control stray radiation inside the detector chips themselves, the surface wave. we demonstrate thi... | surface wave control for large arrays of microwave kinetic inductance detectors |
we discuss the interstellar absorption from many atomic and molecular species seen in high-resolution hubble space telescope/stis uv and high signal-to-noise ratio optical spectra of the moderately reddened b3-5 v star hd 62542. this remarkable sight line exhibits both very steep far-uv extinction and a high fraction o... | hd 62542: probing the bare, dense core of a translucent interstellar cloud |
we study the x-ray spectra of a sample of 19 obscured, optically selected seyfert galaxies (sy 1.8, 1.9, and 2) in the local universe (d ≤ 175 mpc), drawn from the cfa seyfert sample. our analysis is driven by the high sensitivity of nustar in the hard x-rays, coupled with soft x-ray spectra using xmm-newton, chandra, ... | a hard look at local, optically selected, obscured seyfert galaxies |
the successive discoveries of binary merger events by advanced ligo-virgo have been revealing the statistical properties of binary black hole (bbh) populations. a stochastic gravitational wave background (gwb) is a useful tool to probe the cosmological evolution of those compact mergers. in this paper, we study the upp... | gravitational wave backgrounds from coalescing black hole binaries at cosmic dawn: an upper bound |
the nearby red dwarf binary gj65 ab (uv+bl ceti, m5.5ve+m6ve) is a cornerstone system to probe the physics of very low-mass stars. the radii of the two stars are currently known only from indirect photometric estimates, however, and this prevents us from using gj65 ab as calibrators for the mass-radius (m-r) relation. ... | the red dwarf pair gj65 ab: inflated, spinning twins of proxima. fundamental parameters from pionier, naco, and uves observations |
infrared (ir) excesses around k-type red giants (rgs) have previously been discovered using infrared astronomy satellite (iras) data, and past studies have suggested a link between rgs with overabundant li and ir excesses, implying the ejection of circumstellar shells or disks. we revisit the question of ir excesses ar... | on infrared excesses associated with li-rich k giants |
since the year 2000, adaptive optics (ao) has seen the emergence of a variety of new concepts addressing particular science needs; multiconjugate adaptive optics (mcao) is one of them. by correcting the atmospheric turbulence in 3d using several wavefront sensors and a tomographic phase reconstruction approach, mcao ai... | multiconjugate adaptive optics for astronomy |
an x-ray flash, expected in a very early phase of a nova outburst, was at last detected with the srg/erosita in the classical nova yz reticuli 2020. the observed flash timescale, luminosity, and blackbody temperature substantially constrain the nova model. we present light-curve models of the x-ray flash for various wh... | a light-curve analysis of the x-ray flash first observed in classical novae |
ultrafast lasers generating high-repetition-rate ultrashort pulses through various mode-locking methods can benefit many important applications, including communications, materials processing, astronomical observation, etc. for decades, mode-locking based on dissipative four-wave-mixing (dfwm) has been fundamental in p... | all-fiber ultrafast laser generating gigahertz-rate pulses based on a hybrid plasmonic microfiber resonator |
in this issi-supported series of studies on magnetic helicity in the sun, we systematically implement different magnetic helicity calculation methods on high-quality solar magnetogram observations. we apply finite-volume, discrete flux tube (in particular, connectivity-based) and flux-integration methods to data from h... | magnetic helicity estimations in models and observations of the solar magnetic field. iv. application to solar observations |
infrared (ir) spectra of two solid aromatic compounds, benzene (c6h6) and pyridine (c5h5n), have been recorded in their amorphous and crystalline states. measurements of density and refractive index (λ = 670 nm) are reported for each form of each compound, quantities needed to compute ir intensities and optical constan... | infrared spectra and optical constants of astronomical ices: iv. benzene and pyridine |
measuring the charge of a nanoparticle is of great importance in many fields including optics, astronomy, biochemistry, atmospheric science, environmental engineering, and dusty plasma. here, we propose to use a high-q whispering-gallery-mode (wgm) optical microresonator to detect the surface and bulk charge of a diele... | measuring the charge of a single dielectric nanoparticle using a high-q optical microresonator |
imaging through scattering media is encountered in many disciplines or sciences, ranging from biology, mesescopic physics and astronomy. but it is still a big challenge because light suffers from multiple scattering is such media and can be totally decorrelated. here, we propose a deep-learning-based method that can re... | exploit imaging through opaque wall via deep learning |
context. the upper-scorpius association (5-11 myr) contains a unique population of low-mass (m ≤ 30mjup) brown dwarfs either free-floating, forming wide pairs, or on wide orbits around solar-type and massive stars. the detailed relative characterization of their physical properties (mass, radius, temperature, compositi... | a new take on the low-mass brown dwarf companions on wide orbits in upper-scorpius |
we investigate the stellar populations of 25 massive galaxies (log [{{m}*}/{{m}⊙ }]≥slant 10.9) at 1.5\lt z\lt 2 using data obtained with the k-band multi-object spectrograph (kmos) on the eso vlt. targets were selected to be quiescent based on their broadband colors and redshifts using data from the 3d-hst grism surve... | first results from the virial survey: the stellar content of uvj-selected quiescent galaxies at 1.5 < z < 2 from kmos |
we report observations of the type iax supernova (sn iax) 2012z at optical and near-infrared (nir) wavelengths from immediately after the explosion until ∼260 days after the maximum luminosity using the optical and infrared synergetic telescopes for education and research target-of-opportunity program and the subaru te... | oister optical and near-infrared observations of type iax supernova 2012z |
integrating our knowledge of star formation (sf) traced by observations at different wavelengths is essential for correctly interpreting and comparing sf activity in a variety of systems and environments. this study compares extinction corrected integrated ultraviolet (uv) emission from resolved galaxies with color-mag... | calibrating uv star formation rates for dwarf galaxies from starbirds |
the spectral resolution of a dispersive spectrograph is dependent on the width of the entrance slit. this means that astronomical spectrographs trade-off throughput with spectral resolving power. recently, optical guided-wave transitions known as photonic lanterns have been proposed to circumvent this trade-off, by ena... | photonic spatial reformatting of stellar light for diffraction-limited spectroscopy |
weak gravitational lensing studies aim to measure small distortions in the shapes of distant galaxies, thus placing very tight demands on the understanding of detector-induced systematic effects in astronomical images. the wide-field infrared survey telescope will carry out weak lensing measurements in the near-infrare... | brighter-fatter effect in near-infrared detectors. i. theory of flat autocorrelations |
the new sai msu observatory 2.5-meter telescope and capabilities of its current instrumentation are described. the facility operates actively since 2014 in parallel to the engineering works. it has delivered a number of prominent results in the field of optical and near-infrared photometry and spectroscopy as well as n... | the caucasian mountain observatory of the sternberg astronomical institute: first six years of operation |
the optical constants of ruthenium in the spectral range 8 nm to 23.75 nm with their corresponding uncertainties are derived from the reflectance of a sputtered ruthenium thin film in the extreme ultraviolet (euv) spectral range measured using monochromatized synchrotron radiation. this work emphasizes the correlation ... | time-frequency analysis assisted determination of ruthenium optical constants in the sub-euv spectral range 8 nm - 2375 nm |
context. the evolution of massive stars depends on several physical processes and parameters. metallicity and rotation are among the most important, but their quantitative effects are not well understood.aims: to complement our earlier study on main-sequence stars, we study the evolutionary and physical properties of e... | massive stars in the small magellanic cloud. evolution, rotation, and surface abundances |
we present an analysis of wind absorption in the c ii λ1335 doublet toward 40 classical t tauri stars with archival far-ultraviolet (fuv) spectra obtained by the hubble space telescope. absorption features produced by fast or slow winds are commonly detected (36 out of 40 targets) in our sample. the wind velocity of th... | probing protoplanetary disk winds with c ii absorption |
microlensing is a powerful technique to study the galactic population of "dark" objects such as exoplanets both bound and unbound, brown dwarfs, low-luminosity stars, old white dwarfs, and neutron stars, and it is almost the only way to study isolated stellar-mass black holes. the majority of previous efforts to search... | microlensing events in the galactic plane using the zwicky transient facility |
uncertainty in the wide-angle point-spread function (psf) at large angles (tens of arcseconds and beyond) is one of the dominant sources of error in a number of important quantities in observational astronomy. examples include the stellar mass and shape of galactic halos and the maximum extent of starlight in the disks... | a method to characterize the wide-angle point-spread function of astronomical images |
we report observations of the recently discovered warm neptune toi-674 b (5.25 r ⊕, 23.6 m ⊕) with the hubble space telescope's wide field camera 3 instrument. toi-674 b is in the neptune desert, an observed paucity of neptune-size exoplanets at short orbital periods. planets in the desert are thought to have complex e... | a mirage or an oasis? water vapor in the atmosphere of the warm neptune toi-674 b |
we present the package gravelamps, which is designed to analyze gravitationally lensed gravitational wave signals in order to constrain the mass density profile of the lensing object. gravelamps does this via parameter estimation using the framework of bilby, which enables estimation of both the lens and the source par... | gravelamps: gravitational wave lensing mass profile model selection |
the paper deals with with the on-sky performance of the pyramid wavefront sensor-based adaptive optics (ao) systems. these wavefront sensors are of great importance, being used in all first light ao systems of the elts (e-elt, gmt, and tmt), currently in design phase. in particular, non-common path aberrations (ncpas) ... | on-sky correction of non-common path aberration with the pyramid wavefront sensor |
this paper describes the polarization spectroscopic telescope array (polstar), a mission proposed to nasa's 2014 small explorer (smex) announcement of opportunity. polstar measures the linear polarization of 3-50 kev (requirement; goal: 2.5-70 kev) x-rays probing the behavior of matter, radiation and the very fabric of... | x-ray polarimetry with the polarization spectroscopic telescope array (polstar) |
we present a high-speed deep learning-based phase retrieval approach for shack-hartmann wavefront sensors used in astronomical adaptive optics. it reconstructs the zernike modal coefficients from the image captured by the wavefront sensor with a lightweight convolutional neural network. compared to the traditional slop... | deep phase retrieval for astronomical shack-hartmann wavefront sensors |
optical phase is a key information carrier in biomedical imaging and astronomical observation. however, it is often obscured by heterogeneous and scattering media, rendering optical phase imaging an utmost challenge. limited by the memory effect or confinement, current methods have difficulties in retrieving phases at ... | single-shot recognition of 3d phase images with deep learning |
neutrino astronomy offers a novel view of the non-thermal universe and is complementary to other astronomical disciplines. the field has seen rapid progress in recent years, including the first detection of astrophysical neutrinos in the tev-pev energy range by icecube and the first identified extragalactic neutrino so... | high-energy neutrino astronomy and the baikal-gvd neutrino telescope |
context. redshifts are fundamental for our understanding of extragalactic x-ray sources. ambiguous counterpart associations, expensive optical spectroscopy, and/or multimission multiwavelength coverage to resolve degeneracies often make estimation difficult in practice.aims: we attempt to constrain redshifts of obscure... | xz: deriving redshifts from x-ray spectra of obscured agn |
the nasa astrophysics division's 30-year roadmap prioritized a future large-aperture space telescope operating in the ultra-violet/optical/infrared wavelength regime. the association of universities for research in astronomy envisioned a similar observatory, the high definition space telescope. and a multi-institution ... | initial technology assessment for the large-aperture uv-optical-infrared (luvoir) mission concept study |
quasars are the most luminous of active galactic nuclei, and are perhaps responsible for quenching star formation in their hosts. the stripe 82x catalog covers 31.3 deg2 of the stripe 82 field, of which the 15.6 deg2 covered with xmm-newton is also covered by herschel/spire. we have 2500 x-ray detected sources with mul... | the accretion history of agn: a newly defined population of cold quasars |
by engineering and manipulating quantum entanglement between incoming photons and experimental apparatus, we construct single-photon detectors which cannot distinguish between photons of very different wavelengths. these color-erasure detectors enable a new kind of intensity interferometry, with potential applications ... | color erasure detectors enable chromatic interferometry |
we present and discuss ultraviolet and optical photometry from the ultraviolet/optical telescope, x-ray limits from the x-ray telescope on swift, and imaging polarimetry and ultraviolet/optical spectroscopy with the hubble space telescope, all from observations of asassn-15lh. it has been classified as a hydrogen-poor ... | asassn-15lh: a superluminous ultraviolet rebrightening observed by swift and hubble |
an optical downlink for the return of scientific data from space probes at interstellar distances is studied. the context is probes moving at relativistic speed using a terrestrial directed-energy beam for propulsion, necessitating very low mass probes. achieving simultaneous communication from a swarm of probes launch... | challenges in scientific data communication from low-mass interstellar probes |
we present atacama large millimeter/submillimeter array [c ii] 158 μm line and far-infrared (fir) continuum emission observations toward hsc j120505.09-000027.9 (j1205-0000) at z = 6.72 with a beam size of ∼0"8 × 0"5 (or 4.1 kpc × 2.6 kpc), the most distant red quasar known to date. red quasars are modestly reddened by... | subaru high-z exploration of low-luminosity quasars (shellqs). xii. extended [c ii] structure (merger or outflow) in a z = 6.72 red quasar |
over the past decade, time-domain astronomy in optical bands has developed rapidly with the operations of some wide-field survey facilities. however, most of these surveys are conducted with only a single band, and simultaneous color information is usually unavailable for the objects monitored during the survey. here w... | the tsinghua university-ma huateng telescopes for survey: overview and performance of the system |
we present high spatial resolution (~0.″4, 2.2 kpc) observations of the co(6-5), co(7-6), and [c i]369 μm lines and dust continuum emission from the interstellar medium (ism) in the host galaxy of the quasar j0305-3150 at z = 6.6. these, together with archival [c ii]158 μm data at a comparable spatial resolution, enabl... | spatially resolved molecular interstellar medium in a z = 6.6 quasar host galaxy |
here, we present the status of an ongoing project aimed at developing a point spread function (psf) reconstruction software for adaptive optics (ao) observations. in particular, we test for the first time the implementation of pyramid wave-front sensor data on our algorithms. as a first step in assessing its reliabilit... | point spread function reconstruction for soul + luci lbt data |
gamma-ray astronomy in the time domain has been by now progressed further as the variabilities of active galactic nuclei (agns) on different timescales have been reported a lot. we study the γ-ray variabilities of 23 jetted agns by applying a stochastic process method to the ~12.7 yr long-term light curve (lc) obtained... | characterizing the γ-ray variability of active galactic nuclei with the stochastic process method |
old, digitized astronomical images taken before the human spacefaring age offer a unique view of the sky devoid of known artificial satellites. in this paper, we have carried out the first optical searches ever for non-terrestrial artifacts near the earth following the method proposed in villarroel et al. (2022). we us... | is there a background population of high-albedo objects in geosynchronous orbits around earth? |
starlight corrupted by atmospheric turbulence cannot couple efficiently into astronomical instruments based on integrated optics as they require light of high spatial coherence to couple into their single-mode waveguides. low-order adaptive optics in combination with photonic lanterns offer a practical approach to achi... | starlight coupling through atmospheric turbulence into few-mode fibres and photonic lanterns in the presence of partial adaptive optics correction |
light pollution is a novel environmental problem whose extent and severity are rapidly increasing. among other concerns, it threatens global biodiversity, nocturnal animal migration, and the integrity of the ground-based astronomy research enterprise. the most familiar manifestation of light pollution is skyglow, the r... | air pollution mitigation can reduce the brightness of the night sky in and near cities |
the lwir and longer wavelength regions are of particular interest for new developments and new approaches to realizing long-wavelength infrared (lwir) photodetectors with high detectivity and high responsivity. these photodetectors are highly desirable for applications such as infrared earth science and astronomy, remo... | band-structure-engineered high-gain lwir photodetector based on a type-ii superlattice |
the ability to detect individual light quanta - single photons - is prized across many fields of physics from astronomy to quantum optics. superconducting photon detectors offer exceptional performance in terms of sensitivity, spectral range and timing resolution. in this review, we introduce the underlying physics of ... | superconducting photon detectors |
measurement of the state of polarization of light is essential in a vast number of applications, such as quantum and classical communications, remote sensing, astronomy, and biomedical diagnostics. nanophotonic structures and integrated photonic circuits can, in many circumstances, replace conventional discrete optical... | optimal ultra-miniature polarimeters in silicon photonic integrated circuits |
obtaining large samples of galaxy clusters is important for cosmology: cluster counts as a function of redshift and mass can constrain the parameters of our universe. they are also useful in order to understand the formation and evolution of clusters. we develop an improved version of the adami & mazure cluster fin... | evolution of the cluster optical galaxy luminosity function in the cfhtls: breaking the degeneracy between mass and redshift |
broadband refractive optics realized from high-index materials provide compelling design solutions for the next generation of observatories for the cosmic microwave background and for sub-millimeter astronomy. in this paper, work is presented which extends the state of the art in silicon lenses with metamaterial antire... | pushing the limits of broadband and high-frequency metamaterial silicon antireflection coatings |
we present a hubble diagram of sne ii using corrected magnitudes derived only from photometry, with no input of spectral information. we use a data set from the carnegie supernovae project i for which optical and near-infrared light curves were obtained. the apparent magnitude is corrected by two observables, one corre... | a hubble diagram from type ii supernovae based solely on photometry: the photometric color method |
we present a new algorithm designed to improve the signal-to-noise ratio (s/n) of point and extended source detections around bright stars in direct imaging data.one of our innovations is that we insert simulated point sources into the science images, which we then try to recover with maximum s/n. this improves the s/n... | improving signal-to-noise in the direct imaging of exoplanets and circumstellar disks with mloci |
near-infrared (nir) high-resolution spectroscopy is a fundamental observational method in astronomy. it provides significant information on the kinematics, the magnetic fields, and the chemical abundances, of astronomical objects embedded in or behind the highly extinctive clouds or at the cosmological distances. scien... | high sensitivity, wide coverage, and high-resolution nir non-cryogenic spectrograph, winered |
aims: binary neutron stars are among the most promising candidates for joint gravitational-wave and electromagnetic astronomy. the goal of this work is to investigate various observing strategies that telescopes with wide field of view might incorporate while searching for electromagnetic counterparts of gravitational-... | tiling strategies for optical follow-up of gravitational-wave triggers by telescopes with a wide field of view |
phase retrieval, i.e., the problem of recovering a function from the squared magnitude of its fourier transform, arises in many applications such as x-ray crystallography, diffraction imaging, optics, quantum mechanics, and astronomy. this problem has confounded engineers, physicists, and mathematicians for many decade... | the numerics of phase retrieval |
the intergalactic medium (igm) at z ∼ 5 to 6 is largely ionized, and yet the main source for the igm ionization in the early universe is uncertain. of the possible contributors are faint quasars with $-26\lesssim {m}_{1450}\lesssim -23$ , but their number density is poorly constrained at z ∼ 5. in this paper, we presen... | the infrared medium-deep survey. vii. faint quasars at z ∼ 5 in the elais-n1 field |
we report the discovery of cool j1241+2219, a strongly lensed galaxy at redshift z = 5.043 ± 0.002 with observed magnitude zab = 20.47, lensed by a moderate-mass galaxy cluster at z = 1.001 ± 0.001. cool j1241+2219 is the brightest lensed galaxy currently known at optical and near-infrared wavelengths at z ≳ 5; it is ∼... | cool-lamps. i. an extraordinarily bright lensed galaxy at redshift 5.04 |
the beijing-arizona sky survey (bass) data release 3 (dr3) catalogue was released in 2019, which contains the data from all bass and the mosaic z-band legacy survey (mzls) observations during 2015 january and 2019 march, about 200 million sources. we cross-match bass dr3 with spectral data bases from the sloan digital ... | identification of bass dr3 sources as stars, galaxies, and quasars by xgboost |
high extinction and crowding create a natural limitation for optical surveys towards the central regions of the milky way, where the gas and dust are mainly confined. large-scale near-infrared (ir) surveys of the galactic plane and bulge are a good opportunity to explore open scientific questions as well as to test our... | the vista variables in the vía láctea infrared variability catalogue (viva-i) |
we present hubble space telescope (hst) observations of the low surface brightness (sb) galaxy coma p. this system was first discovered in the arecibo legacy fast alfa h i survey and was cataloged as an (almost) dark galaxy because it did not exhibit any obvious optical counterpart in the available survey data (e.g., s... | the enigmatic (almost) dark galaxy coma p: distance measurement and stellar populations from hst imaging |
optical metrology and high-resolution spectroscopy, despite impressive progress across diverse regions of the electromagnetic spectrum from ultraviolet to terahertz frequencies, are still severely limited in the region of vibrational bending modes from 13 to 20 µm. this long-wavelength part of the mid-infrared range re... | optical frequency metrology in the bending modes region |
we describe a new instrument capable of high-precision (10-5) polarimetric observations simultaneously in three passbands (bvr). the instrument utilizes electron-multiplying charge-coupled device (em ccd) cameras for high efficiency and fast image readout. the key features of the double image polarimeter—ultra fast (di... | double image polarimeter—ultra fast: simultaneous three-color (bv r) polarimeter with electron-multiplying charge-coupled devices |
it is well known that pixel binning is an effective method for improving the signal-to-noise ratio (snr) of silicon detectors. it has found extensive use in the study of spectroscopy, astronomy, and in the development of numerous image processing algorithms. however, the positive impact of binning technique on snr does... | signal-to-noise analysis of point target detection using image pixel binning for space-based infrared electro-optical systems |
integrated optical models allow for accurate prediction of the as-built performance of an optical instrument. optical models are typically composed of a separate ray trace and diffraction model to capture both the geometrical and physical regimes of light. these models are typically separated across both open-source an... | poke: an open-source, ray-based physical optics platform |
based on previous site testing and satellite cloud data, ali, daocheng and muztagh-ata have been selected as candidate sites for the large optical/infrared telescope (lot) in china. we present the data collection, processing, management and quality analysis for our site testing based on using similar hardware. we analy... | data processing and data products from 2017 to 2019 campaign of astronomical site testing at ali, daocheng and muztagh-ata |
we present results of the long-term multiwavelength study of optical, uv, and x-ray variability of the nearby changing-look (cl) seyfert ngc 1566 observed with the swift observatory and the master global robotic network from 2007 to 2019. we started spectral observations with south african astronomical observatory 1.9-... | the post-maximum behaviour of the changing-look seyfert galaxy ngc 1566 |
in the east african rift, the western margin of lake turkana (northern kenya) exposes mio-plio-pleistocene lake sediments with dated volcanic horizons constraining basin dynamics at the astronomical time scale. since the late pliocene, coastal archaeological sites have formed within the lacustrine dynamics. here, lake ... | lake-level changes and hominin occupations in the arid turkana basin during volcanic closure of the omo river outflows to the indian ocean |
infrared (ir) thermal camouflage and management are deeply desirable in the field of military and astronomy. while ir compatible with laser camouflage technology is extensively studied to counter modern detection systems, most existing strategies for visible light camouflage focus on color matching, which is not suitab... | optical transparent metamaterial with multi-band compatible camouflage based on inverse design |
we present the earliest astronomical observation of a high-energy neutrino error box of which the variability was discovered after high-energy-neutrino detection. the one robotic telescope of the master global international networks automatically imaged the error box of the very high-energy-neutrino event icecube-17092... | optical observations reveal strong evidence for high-energy neutrino progenitor |
the esa's x-ray multi-mirror mission (xmm-newton) created a new high-quality version of the xmm-newton serendipitous source catalogue, 4xmm-dr9, which provides a wealth of information for observed sources. the 4xmm-dr9 catalogue is correlated with the sloan digital sky survey (sdss) dr12 photometric data base and the a... | classification of 4xmm-dr9 sources by machine learning |
the optical gravitational lensing experiment (ogle) continuously monitors hundreds of thousands of eclipsing binaries in the galactic bulge field and the magellanic clouds. these objects have been classified into major morphological subclasses, such as contact, noncontact, ellipsoidal, and cataclysmic variables, both b... | classification of ogle eclipsing binary stars based on their morphology type with locally linear embedding |
we report the results of high-angular-resolution observations that search for exozodiacal light in a sample of main sequence stars and sub-giants. using the "jouvence" of the fiber linked unit for optical recombination (jouflu) at the center for high angular resolution astronomy (chara) telescope array, we have observe... | a near-infrared interferometric survey of debris-disc stars. vi. extending the exozodiacal light survey with chara/jouflu |
the ongoing ligo-virgo-kagra observing run o4 provides an opportunity to discover new multimessenger events, including binary neutron star (bns) mergers such as gw170817 and the highly anticipated first detection of a multimessenger black hole-neutron star (bh-ns) merger. while bns mergers were predicted to exhibit ear... | hours-long near-uv/optical emission from mildly relativistic outflows in black hole-neutron star mergers |
this work focuses on active galactic nuclei (agns) and on the relation between the sizes of the hot dust continuum and the broad-line region (blr). we find that the continuum size measured using optical/near-infrared interferometry (oi) is roughly twice that measured by reverberation mapping (rm). both oi and rm contin... | toward measuring supermassive black hole masses with interferometric observations of the dust continuum |
visions is an eso public survey of five nearby (d < 500 pc) star-forming molecular cloud complexes that are canonically associated with the constellations of chamaeleon, corona australis, lupus, ophiuchus, and orion. the survey was carried out with the visible and infrared survey telescope for astronomy (vista), usi... | visions: the vista star formation atlas. i. survey overview |
night sky brightness (nsb) measurements inform both the selection of new ground-based optical and near-infrared astronomical observatory sites and the management of night-time conditions near existing facilities. nsb modelling supports site characterization in cases where obtaining in situ measurements is difficult and... | a systematic light pollution modelling bias in present night sky brightness predictions |
stream-stream collision may be an important prepeak energy dissipation mechanism in tidal disruption events (tdes). we perform local three-dimensional radiation hydrodynamic simulations in a wedge geometry including the gravity to study stream self-crossing with an emphasis on resolving the collision and following the ... | a bright first day for tidal disruption events |
one of the top remaining science challenges in astronomical optics is the direct imaging and characterization of extrasolar planets and planetary systems. directly imaging exoplanets from ground-based observatories requires combining high-order adaptive optics with a stellar coronagraph observing at wavelengths ranging... | millisecond exoplanet imaging: i method and simulation results |
dual active galactic nuclei (agns), which are the manifestation of two actively accreting supermassive black holes (smbhs) hosted by a pair of merging galaxies, are a unique laboratory for studying the physics of smbh feeding and feedback during an indispensable stage of galaxy evolution. in this work, we present noema... | noema detection of circumnuclear molecular gas in x-ray weak dual active galactic nuclei: no evidence for heavy obscuration |
we present spitzer, wide-field infrared survey explorer (wise), and herschel observations of the young supernova remnant (snr) n132d in the large magellanic cloud, including 3-40 μm spitzer infrared spectrograph (irs) mapping, 12 μm wise and 70, 100, 160, 250, 350, and 500 μm herschel images. the high-velocity lines of... | infrared ejecta and cold dust in the young supernova remnant n132d |
we report the discovery of extremely low mass white dwarfs (elm wds) as a companion of blue straggler stars (bsss) in the galactic globular cluster ngc 362 using images from astrosat's ultra violet imaging telescope (uvit). spectral energy distributions (seds) for 26 far-uv (fuv) bright member bsss are created using da... | globules. iv. uvit/astrosat detection of extremely low mass white dwarf companions to blue straggler stars in ngc 362 |
to overcome the high optical extinction, near-infrared (nir) observations are needed for probing the microlensing events toward the galactic center. the 2015-2019 ukirt microlensing survey toward the galactic center is the first dedicated precursor nir survey for the nancy grace roman space telescope. here, we analyze ... | toward measuring the microlensing event rate in the galactic center. i. event detection from the ukirt microlensing survey data |
the potential association between tidal disruption events and high-energy astrophysical neutrinos implies the acceleration of cosmic rays. these accelerated particles will initiate electromagnetic (em) cascades spanning from kev to gev energies via the processes related to neutrino production. we model the em cascade a... | electromagnetic cascade emission from neutrino-coincident tidal disruption events |
we present the results of our x-ray, ultraviolet, and optical follow-up campaigns of 1rxs j165424.6-433758, an x-ray source detected with the swift deep galactic plane survey. the source x-ray spectrum (swift and nustar) is described by thermal bremsstrahlung radiation with a temperature of kt = 10.1 ± 1.2 kev, yieldin... | identification of 1rxs j165424.6-433758 as a polar cataclysmic variable |
we report the detection of several quasiperiodicities around 0.6-2.5 days in the optical emission of the blazar s4 0954+658. the source was observed by the transiting exoplanet survey satellite in six sectors and it showed these features in all but one of them, with a quasiperiodic oscillation of 1.52 days apparently p... | detection of quasiperiodic oscillations in the blazar s4 0954+658 with tess |
we present the highest-angular-resolution infrared monitoring of lkca 15, a young solar analog hosting a transition disk. this system has been the subject of a number of direct-imaging studies from the millimeter through the optical, which have revealed multiple protoplanetary disk rings as well as three orbiting proto... | systematic multiepoch monitoring of lkca 15: dynamic dust structures on solar system scales |
advances in high-resolution laser spectroscopy have enabled many scientific breakthroughs in physics, chemistry, biology and astronomy. optical frequency combs have pushed measurement limits with ultrahigh-frequency accuracy and fast-measurement speed while tunable diode laser spectroscopy is used in scenarios that req... | on-the-fly precision spectroscopy with a dual-modulated tunable diode laser and hz-level referencing to a cavity |
a panchromatic investigation of morphology for the early-type spiral galaxy m81 is presented in this paper. we perform bulge-disk decomposition in m81 images at a total of 20 wave bands from far-uv to near-ir (nir) obtained with galex, swift, sloan digital sky survey, wiyn, two micron all sky survey, wide-field infrare... | multiwavelength bulge-disk decomposition for the galaxy m81 (ngc 3031). i. morphology |
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