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automatic scheduling techniques are becoming a crucial tool for the efficient planning of large astronomical surveys. a specific scheduling method is being designed and developed for the atmospheric remote-sensing infrared exoplanet large-survey (ariel) mission planning based on a hybrid meta-heuristic algorithm with g... | ariel mission planning. scheduling the survey of a thousand exoplanets |
european southern observatory (eso)'s very large telescope interferometer (vlti), paranal, chile, is one of the most proficient observatories in the world for high angular resolution astronomy. it has hosted several interferometric instruments operating in various bandwidths in the infrared. as a result, the vlti has y... | high-angular resolution and high contrast observations from y to l band at the very large telescope interferometer with the asgard instrumental suite |
starless cores represent the initial stage of evolution toward (proto)star formation, and a subset of them, known as prestellar cores, with high density (~ 106 cm-3 or higher) and being centrally concentrated are expected to be embryos of (proto)stars. determining the density profile of prestellar cores therefore provi... | alma survey of orion planck galactic cold clumps (almasop): density structure of centrally concentrated prestellar cores from multiscale observations |
the spectral line energy distribution of carbon monoxide contains information about the physical conditions of the star-forming molecular hydrogen gas; however, the relation to local radiation field properties is poorly constrained. using ~1-2 kpc scale atacama large millimeter array observations of co(3-2) and co(4-3)... | co excitation in high-z main-sequence analogues: resolved co(4-3)/co(3-2) line ratios in dynamo galaxies |
we report contrast measurements of a sodium resonance guide star against the daylight sky when observed through a tuned magneto-optical filter (mof). the guide star was created by projection of a laser beam at 589.16 nm into the mesospheric sodium layer and the observations were made with a collocated 1.5-m telescope. ... | daylight operation of a sodium laser guide star for adaptive optics wavefront sensing |
using infrared spectroscopy as an in situ probe for reactions occurring in the solid phase, we investigated the influence of water molecules on the photochemistry of ammonia ices. experiments were carried out in diluted and concentrated phases and between 3 and 130 k. we showed that the photolysis of nh3-h2o (2 per cen... | the catalytic role of water in the photochemistry of ammonia ice: from diluted to concentrated phase |
active optics techniques on large telescopes and astronomical instrumentations provide high imaging quality. for ground-based astronomy, the co-addition of adaptive optics again increases angular resolution up to providing diffraction-limited imaging at least in the infrared. active and adaptive optics marked milestone... | active optics in astronomy - modeling of deformable substrates: freeform surfaces for fireball and messier |
the algorithm for the reduction of spectroscopic observations with the astronircam camera-spectrograph installed at the 2.5-m telescope of the sternberg astronomical institute of the moscow state university is described. the instrument allows spectra of astronomical objects with long ($280^''$) and short ($10^''$) slit... | characterization of the astronircam spectral mode |
we present new moderate-resolution near-infrared spectroscopy of three cvs obtained using gnirs on gemini-north. these spectra covered three 13co bandheads found in the k-band, allowing us to derive the isotopic abundance ratios for carbon. we find small 12c/13c ratios for all three donor stars. in addition, these thre... | determinations of the 12c/13c ratio for the secondary stars of ae aquarii, ss cygni, and ru pegasi |
this study presents the results of a quantitative analysis of irmag (infrared stokes spectro-polarimeter, national astronomical observatory of japan, (naoj)/mitaka) observations in three spectral lines fe i 1564.8 nm, si i 1082.72 nm, he i 1083.0 nm, and comparison between irmag magnetograms and ones from the solar dyn... | large-scale solar magnetic fields observed with the infrared spectro-polarimeter irmag at the national astronomical observatory of japan: comparison of measurements made in different spectral lines and observatories |
based on the measurements performed from 2007 to 2015 at the summit of mount shatdzhatmaz adjacent to the 2.5-m telescope at the caucasus observatory of the sai msu, we have determined the statistical characteristics of basic meteorological parameters: the ambient air temperature, the ground wind speed, and the relativ... | meteorological conditions at the caucasus observatory of the sai msu from the results of the 2007-2015 campaign |
the recent astronomical detection of c-c3hc2h and l-c5h2 has led to increased interest in c5h2 isomers and their relative stability. the present work provides the first complete list of anharmonic vibrational spectral data with infrared intensities for three such isomers as well as including the first set of rotational... | theoretical spectra and energetics for c-c3hc2h, l-c5h2 , and bipyramidal d3h c5h2 |
the national solar observatory is currently developing the accurate infrared magnetic field measurements of the sun (aims). the primary mirror of the aims solar telescope is an off-axis parabolic with a diameter of 1 m and with a large off-axis amount of 1 m. due to the surface figure of the primary mirror under the us... | distortion mapping correction in the aims primary mirror testing by a computer-generated hologram |
a recent publication on the radiation chemistry and ir spectroscopy of n2 + acetone ices is used to illustrate some of the difficulties encountered in the study of astronomical ice analogues. concerns and problems are identified and suggestions for their solution are presented, including new infrared (ir) spectra of am... | molecular identifications in experiments with astronomical ice analogues: new data, old strategies, and the n2 + acetone system |
optical ubvri photometric measurements using the faulkes telescope north were taken in early 2011 and combined with 2mass jhks and wise infrared photometry as well as ucac4 proper motion data in order to estimate the main parameters of the galactic open cluster ngc 2215 of which large uncertainty exists in the current ... | photometric and proper motion study of the neglected open cluster ngc 2215 |
advanced astronomy for heliophysics plus (adaheli) is a project concept for a small solar and space weather mission with a budget compatible with an european space agency (esa) s-class mission, including launch, and a fast development cycle. adaheli was submitted to the european space agency by a european-wide consorti... | adaheli: exploring the fast, dynamic sun in the x-ray, optical, and near-infrared |
we report an ultrabright lensed submillimeter galaxy at zspec = 1.4796, identified as a result of a full-sky cross-correlation of the allwise and planck compact source catalogs aimed at searching for bright submillimeter galaxies at z ~ 1.5-2.8. atacama pathfinder experiment (apex)/laboca observations of the candidate ... | the einstein ring gal-clus-022058s: a lensed ultrabright submillimeter galaxy at z = 1.4796 |
the joint u.s. and german stratospheric observatory for infrared astronomy (sofia), project has been operating airborne astronomy flights from palmdale, california since 2011. the observatory consists of a modified 747-sp aircraft with a 2.5-meter telescope in its aft section. sofia has a suite of eight science instrum... | stratospheric observatory for infrared astronomy (sofia) |
the field of computer vision has greatly matured in the past decade, and many of the methods and techniques can be useful for astronomical applications. one example is in searching large imaging surveys for objects of interest, especially when it is difficult to specify the characteristics of the objects being searched... | a semi-automated computational approach for infrared dark cloud localization: a catalog of infrared dark clouds |
context. oh is a key molecule in h2o chemistry, a valuable tool for probing physical conditions, and an important contributor to the cooling of shock regions around high-mass protostars. oh participates in the re-distribution of energy from the protostar towards the surrounding interstellar medium.aims: our aim is to a... | challenging shock models with sofia oh observations in the high-mass star-forming region cepheus a |
we present a general surface brightness correction method for compact extended sources imaged in the slow-scan pointed observation mode of the far-infrared surveyor (fis) aboard the akari infrared astronomical satellite. our method recovers correct surface brightness distribution maps by rescaling archived raw fis maps... | surface brightness correction for compact extended sources observed by the akari far-infrared surveyor in the slow-scan mode |
transit spectroscopy of habitable planets orbiting late-type stars requires high relative spectrophotometric accuracy between wavelengths during transit/eclipse observation. the spectrophotometric signal is affected not only by image movement and deformation due to wavefront error but also by electrical variation in th... | a new method for calibration of gain variation in a detector system |
we present multi-wavelength data on the globally infalling molecular cloud/protostellar cluster byf 73. these include new far-infrared (fir) spectral line and continuum data from the stratospheric observatory for infrared astronomy’s (sofia’s) far infrared field-imaging line spectrometer (fifi-ls), mid-infrared (mir) o... | gemini, sofia, and atca reveal very young, massive protostars in the collapsing molecular cloud byf 73 |
high time resolution optical/infrared (ir) astronomy will require fast response detectors. in order to meet such requirement, cryogenic optical/ir detectors, such as superconducting tunnel junctions and transition-edge sensors, are under development. of these cryogenic detectors, superconducting titanium (ti) bolometri... | fast-response superconducting titanium bolometric detectors |
we are developing far-infrared (fir) imaging sensors for low-background and high-sensitivity applications such as infrared astronomy. previous fir monolithic imaging sensors, such as an extrinsic germanium photo-conductor (ge pc) with a pmos readout integrated circuit (roic) hybridized by indium pixel-to-pixel intercon... | development for germanium blocked impurity band far-infrared image sensors with fully-depleted silicon-on-insulator cmos readout integrated circuit |
the stratospheric observatory for infrared astronomy (sofia) is a heavily modified boeing 747sp aircraft, accommodating a 2.5m infrared telescope. this airborne observation platform takes astronomers to flight altitudes of up to 13.7 km (45,000ft) and therefore allows an unobstructed view of the infrared universe at wa... | development of the fpi+ as facility science instrument for sofia cycle four observations |
the development of smart alignment and integration strategies for imaging mirror systems to be used within astronomical instrumentation are especially important with regard to the increasing impact of non-rotationally symmetric optics. in the present work, well-known assembly approaches preferentially applied in the co... | large aperture freeform vis telescope with smart alignment approach |
spacekids, a european union fp-7 project, has recently been completed. it has focused on developing kinetic inductance detector (kid) arrays and demonstrating their suitability for space applications at far infrared and submillimetre wavelengths. kid arrays have been developed for both low-background (typical of astrop... | spacekids: kinetic inductance detectors for space applications |
the stratospheric observatory for infrared astronomy (sofia) is a 2.5m infrared telescope built into a boeing 747 sp. in 2014 sofia reached its full operational capability milestone and nowadays takes off about three times a week to observe the infrared sky from altitudes above most of the atmosphere's water vapor cont... | sofia's secondary mirror assembly: in-flight performance and control approach |
short-wave infrared (swir) photon detection has become an essential technology in the modern world. sensitive swir detector arrays with high pixel density, low noise levels and high signal-to-noise-ratios are highly desirable for a variety of applications including biophotonics, light detection and ranging, optical tom... | advances on sensitive electron-injection based cameras for low-flux, short-wave-infrared applications |
photoelastic modulators can alter the polarization state of a beam of ultraviolet, visible or infrared photons by means of periodic stress-induced differences in the refractive index of a transparent material that forms the optical element of the device and is isotropic in the absence of stress. they have found widespr... | calibration of photoelastic modulator based dichrometers: maintaining constant phase across the spectrum |
linear-mode avalanche photodiode arrays, lmapds, based on bandgap engineered hgcdte, grown by metal organic vapour phase epitaxy, movpe, can produce virtually noise-free infrared sensors. these are required for applications in big science, security and biochemistry. a custom device called saphira (320x256/24μm) has bee... | linear-mode avalanche photodiode arrays in hgcdte at leonardo, uk: the current status |
observations of ammonia in interstellar environments have revealed high levels of deuteration, and all its d-containing variants, including nd3, have been detected in cold prestellar cores and around young protostars. the observation of these deuterated isotopologues is very useful for elucidating the chemical and phys... | submillimeter and far-infrared spectroscopy of monodeuterated amidogen radical (nhd): improved rest frequencies for astrophysical observations |
we report second-timescale infrared photometry of the nova v1674 her using palomar gattini-ir (pgir). these observations constitute the first infrared and highest temporal resolution data (resolution of ≈0.84 s) of the nova reported to date. pgir observed in this fast readout mode for more than an hour on three nights ... | second timescale photometry of the very fast nova v1674 her with palomar gattini-ir |
small-jasmine is a space mission to provide astrometric data with high precisions (20 micro-arcseconds level) in a near infrared band for stars in the galactic central regions. the primary scientific objective is to carry out the galactic center archeology and galactoseismology by exploring the galactic nuclear bulge a... | galactic center archeology through the exploration of the nuclear bulge by small-jasmine |
a new astronomical observatory in south-eastern indonesia is currently under construction. this timau national observatory will host a 3.8-m telescope for optical and near-infrared observations. to support the operation and planning, the characterization of the site needs to be appropriately performed. however, limited... | characterization of timau national observatory using limited in situ measurements |
the akari infrared astronomical satellite produced all-sky survey (afass) maps in the far-infrared at roughly arcminute spatial resolution, enabling us to investigate the whole sky in the far-infrared for objects having surface brightnesses greater than a few to a couple of dozen mjy sr-1. while the afass maps are abso... | on surface brightness and flux calibration for point and compact extended sources in the akari far-ir all-sky survey (afass) maps |
the currently defined 'united kingdom infrared telescope (ukirt) faint standards' have jhk magnitudes between 10 and 15, with kmedian = 11.2. these stars will be too bright for the next generation of large telescopes. we have used multi-epoch observations taken as part of the ukirt infrared deep sky survey (ukidss) and... | faint standards for zyjhk from the ukidss and vista surveys |
tracing dust in small dense molecular cores is a powerful tool to study the conditions required for ices to form during the prestellar phase. to study these environments, five molecular cores were observed: three with ongoing low-mass star formation (b59, b335, and l483), and two starless collapsing cores (l63 and l694... | constraining spatial densities of early ice formation in small dense molecular cores from extinction maps |
combining infrared and submillimeter observations and applying a two-temperature modified blackbody (tmbb) model with a hierarchical bayesian technique, we model the spectral energy distribution of 12 nearby dwarf irregular (dirr) galaxies. we aim to probe potential submillimeter excess emission at 350, 500, and 850 μm... | investigating cold dust properties of 12 nearby dwarf irregular galaxies by hierarchical bayesian spectral energy distribution fitting |
the persistence of planetary systems after their host stars evolve into their post-main-sequence phase is poorly constrained by observations. many young white dwarf systems exhibit infrared excess emission and/or spectral absorption lines associated with a reservoir of dust (or planetesimals) and its accretion. however... | evidence for the disruption of a planetary system during the formation of the helix nebula |
giant planets within the habitable zones of the closest several stars can currently be imaged with ground-based telescopes. within the next decade, the extremely large telescopes (elts) will begin to image the habitable zones of a greater number of nearby stars with much higher sensitivity, potentially imaging exo-eart... | the direct mid-infrared detectability of habitable-zone exoplanets around nearby stars |
great comet c/1995 o1 (hale-bopp) is a long-period comet and one of the largest cometary nuclei known. being a bright naked-eye object in 1997, its presence in the night sky spurred many investigations into the comet's composition, behavior, and dynamical properties. owing to its large size, detailed studies have been ... | jwst observations of comet c/1995 o1 (hale-bopp) at 46 au |
observing on the stratospheric observatory for infrared astronomy (sofia) requires a strategy that takes the specific circumstances of an airborne platform into account. observations of a source cannot be extended or shortened on the spot due to flight path constraints. still, no exact prediction of the time on source ... | observing with fifi-ls on sofia: time estimates and strategies to use a field imaging spectrometer on an airborne observatory |
the becklin-neugebauer (bn) object in orion has a large proper motion and radial velocity with respect to the gas and other stars in the region where it is presumed to have formed. multiple dynamical interaction scenarios have been proposed to explain this motion. in one case bn is thought to have interacted with stars... | high spectral resolution observations toward orion bn at 6 μm: no evidence for hot water |
irassi is an astronomy mission aimed at observing stellar disks and protoplanetary regions using a constellation of five free-flying telescopes operating around the sun-earth/moon l2 point. in these regions of the cosmos, important chemical/physical phenomena can be observed in the far-infrared, which may advance our c... | iscout: science-task planning and formation maneuver design for the irassi space interferometer |
we present our most recent set of "full-depth" unwise coadds, static sky stacks that combine nine years of wide-field infrared survey explorer (wise) and neowise exposures, resulting in the deepest ever 3-5 μm full-sky maps. here, we publicly release these all-sky w1 (3.4 μm) and w2 (4.6 μm) coadded images. | 9-yr deep sky unwise coadds |
we present doppler wind velocity final results of saturn's zonal flow at cloud level. our aim is help to constrain the characterization of the equatorial jet at cloud level and the latitudinal variation of the zonal winds, to measure its spatial and temporal variability, to contribute to monitor the variability in orde... | saturn atmosphere's winds with vlt/uves doppler velocimetry |
stellar feedback is a crucial ingredient in the evolution of galaxies. massive stars disrupt their natal molecular clouds and perturb the ambient interstellar medium, not only when they explode as supernovae but also during their lifetimes by stellar winds and radiation. the irradiated, heated, and stirred gas cools th... | orion's dragon and other stories: feedback by massive stars |
accurate atomic data for line wavelengths, energy levels, line broadening such as hyperfine structure and isotope structure, and f-values, particularly for the line rich iron group elements, are needed for stellar astrophysics applications, and examples of recent measurements are given. these atomic data are essential ... | recent advances in experimental laboratory astrophysics for stellar astrophysics applications and future data needs |
we present a design for an active telescope for space astronomy. the telescope is capable of both exoplanet work and general astronomy over wavelengths from ∼100 nm up to 5 μm. the primary mirror is 6 m in diameter, formed by 16 mirror segments that are precisely phased and supported on rigid body actuators and with se... | next-generation active telescope for space astronomy |
luvoir is one of four potential large mission concepts for which the nasa astrophysics division has commissioned studies by science and technology definition teams (stdts) drawn from the astronomical community. luvoir will have an 8 to16-m segmented primary mirror and operate at the sun-earth l2 point. it will be desig... | the large ultraviolet/optical/infrared surveyor (luvoir) |
context. studies measuring the star formation rate density, luminosity function, and properties of star-forming galaxies are numerous. however, it exists a gap at 0.5 < z < 0.8 in hα-based studies.aims: our main goal is to study the properties of a sample of faint hα emitters at z ~ 0.62. we focus on their contri... | properties of galaxies at the faint end of the hα luminosity function at z ~ 0.62 |
this article is motivated by the objective of providing a new analytically tractable and fully frequentist framework to characterize and implement regression trees while also allowing a multivariate (potentially high dimensional) response. the connection to regression trees is made by a high dimensional model with dyna... | segmentation of high dimensional means over multi-dimensional change points and connections to regression trees |
with the steadily increasing complexity of scientific instruments, there is an ever-growing demand for improved control electronics. this is especially important for infrared instruments, where the challenging vacuum and cryogenic systems increase the demands on the overall control system. the control electronics must ... | carmenes: interlocks or the importance of process visualization and system diagnostics in complex astronomical instruments |
the mars orbiter for resources, ices, and environments (morie) was selected as one of nasa's 2019 planetary mission concept studies. the mission builds upon recent discoveries and current knowledge gaps linked to two primary scientific questions: (1) when did elements of the cryosphere form and how are ice deposits lin... | the mars orbiter for resources, ices, and environments (morie) science goals and instrument trades in radar, imaging, and spectroscopy |
ast3-nir is a new infrared camera for deployment with the ast3-3 wide-field survey telescope to dome a on the antarctic plateau. this project is designed to take advantage of the low antarctic infrared sky thermal background (particularly within the kdark near infrared atmospheric window at 2.4 μm) and the long antarct... | the ast3-nir camera for the kunlun infrared sky survey |
in 2005 data returned by the cassini spacecraft showed that enceladus' southern polar region is highly active. the activity is concentrated along four fractures located close to enceladus' south pole commonly known as tiger stripes, which are also the source of enceladus' plumes. accurately constraining the endogenic h... | constraining enceladus' heat flow between its tiger stripes |
the recent detection of urea in the interstellar medium raises questions about its stability in different astronomical environments. in this work, we have studied the stability of urea ices and urea/water ice mixtures under vacuum-ultraviolet (vuv; 6.3-10.9 ev) irradiation and high-energy (5 kev) electron bombardment a... | stability of urea in astrophysical ices. a laboratory study of vuv irradiation and high-energy electron bombardment |
we present a new quantitative model for detailed solar-pumped fluorescent emission of the main isotopologue of cn. the derived fluorescence efficiencies permit estimation and interpretation of ro-vibrational infrared line intensities of cn in exospheres exposed to solar (or stellar) radiation. our g-factors are applica... | a solar-pumped fluorescence model for line-by-line emission intensities in the b-x, a-x, and x-x band systems of 12c14n |
cea and sofradir have been involved for 7 years in studies related to a large format detector development for science and astronomy applications. these studies are linked with esa's near infrared large format sensor array roadmap which aims to develop a 2kx2k large format low flux low noise device. the alfa (astronomic... | development of astronomy large focal plane array "alfa" at sofradir and cea |
the stratospheric observatory for infrared astronomy (sofia) has already successfully conducted over 300 flights. in its early science phase, sofia's pointing requirements and especially the image jitter requirements of less than 1 arcsec rms have driven the design of the control system. since the first observation fli... | pointing and control system performance and improvement strategies for the sofia airborne telescope |
we are conducting a multi-wavelength analysis of high-resolution molecular spectra that probe the evolution of gas in the inner 10 au in protoplanetary disks. a sample of 15 disks has been combined to probe a range of inner disk structures including small and large dust cavities. half of the sample has been observed in... | gas evolution in inner disk cavities from a synergic analysis of ir-co and uv-h2 spectra |
we have followed the early phases of dust formation in nova v5668 sgr (nova sgr 2015 #2) with the forcast science instrument on the nasa stratospheric observatory for infrared astronomy (sofia). | sofia observations of dust formation in nova v5668 sgr (2015 #2) |
we describe 238 mid-infrared detections of supernovae and 195 possible supernovae in co-added images of the neowise mission. we find one type ia supernova (sn 2015cp), which has a mid-infrared evolution that is similar to known type ia with long-lived mid-infrared detections. we also find long-lived mid-infrared detect... | mid-infrared detections of type i supernovae and unclassified possible supernovae with neowise |
recently, a new class of quasars, called changing-look quasars (clqs), has been reported. clqs exhibit significant changes in optical and mid-infrared luminosity, accompanied by the appearance or disappearance of broad emission lines. we performed spectroscopic observations at the nishi-harima astronomical observatory ... | discovery of new changing-look quasar 3c 332 and constraints for a double-peaked emission line scenario |
the university of tokyo atacama observatory project is to construct and operate a 6.5m infrared telescope at the summit of co. chajnantor (5640m altitude) in northern chile, promoted by the institute of astronomy of the university of tokyo. thanks to the dry climate (pwv 0.5mm) and the high altitude, excellent observat... | the university of tokyo atacama observatory 6.5m telescope: project overview and current status |
we present a measurement of h2o ice crystallinity on the surface of trans-neptunian objects with near-infrared narrow-band imaging. the newly developed photometric technique allows us to efficiently determine the strength of a 1.65 μm absorption feature in crystalline h2o ice. our data for three large objects—haumea, q... | photometric measurements of h2o ice crystallinity on trans-neptunian objects |
we present new fully-automatic classification model to select extragalactic objects within astronomy photometric catalogs. construction of the our classification model is based on the three important procedures: 1) data representation to create feature space; 2) building hypersurface in feature space to limit range of ... | machine-learning identification of extragalactic objects in the optical-infrared all-sky surveys |
to investigate how the abundance of n2h+ varies as massive clumps evolve, here we present a multiwavelength study toward six molecular clouds. all of these clouds contain several massive clumps in different evolutionary stages of star formation. using archival data of the herschel infrared galactic plane survey (hi-gal... | chemical evolution of n2h+ in six massive star-forming regions |
with the launch of gaia in december 2013, europe entered a new era of space astrometry following in the footsteps of the very successful hipparcos mission. a weakness of gaia is that it only operates at optical wavelengths. however, much of the galactic centre and the spiral arm regions are obscured by interstellar ext... | gaianir - a future all-sky astrometry mission |
high-resolution rotationally resolved spectra of the n-h stretch vibrational mode (ν1) of jet-cooled nd3h+ ions are collected and analyzed in a sub-doppler slit-jet infrared spectrometer. the isotopomeric ammonium ions are generated by proton transfer from h3+ to nd3 in a discharge of an nd3/h2 gas mixture, whereby the... | sub-doppler slit jet infrared spectroscopy of astrochemically relevant cations: the nh stretching mode in nd3h+ |
t. yusa, osaki, japan, reports the discovery by kunihiro shima (fuchu, tokyo) of an apparent supernova (mag 15.5) on an unfiltered ccd frame (limiting magnitude 18.6) taken on mar. 23.788 ut with a 0.45-m f/12 reflector (+ fli ml-8300 camera) at fujimi-machi, nagano, japan. the new object is located at r.a. = 20h37m25s... | supernova 2015g in ngc 6951 = psn j20372558+6607115 |
in preparation of the 2020 astrophysics decadal survey, national aeronautics and space administration (nasa) has commenced a process for the astronomical community to study several large mission concepts leveraging the lessons learned from past decadal surveys. this will enable the decadal survey committee to make more... | status and path forward for the large ultraviolet/optical/infrared surveyor (luvoir) mission concept study |
the joint u.s. and german stratospheric observatory for infrared astronomy (sofia), project has been operating airborne astronomy flights from palmdale, california since 2011. the observatory consists of a modified 747sp aircraft with a 2.5meter telescope in the tail section. in addition to observing flights out of pal... | stratospheric observatory for infrared astronomy (sofia) |
we present and analyze spatially resolved maps for the observed v- and g-band to 3.6 μm flux ratios and the inferred dust-extinction values, av , for a sample of 257 nearby ngc and ic galaxies. flux ratio maps are constructed using point-spread function-matched mosaics of sloan digital sky survey g- and r-band images a... | analysis of the spatially resolved v-3.6 μm colors and dust extinction in 257 nearby ngc and ic galaxies |
we present the time-dependent properties of a poorly known oh/ir star, iras 18278+0931 (hereafter iras 18+09), toward the ophiuchus constellation. we have carried out long-term optical/near-infrared photometric and spectroscopic observations to study the object. from optical r- and i-band light curves, the period of ir... | spectroscopic and photometric monitoring of a poorly known highly luminous oh/ir star: iras 18278+0931 |
the ∼200,000 targets monitored for photometric variability during the kepler prime mission include the best-studied group of stars in the sky, due both to the extensive time history provided by kepler and to the substantial amount of ancillary data provided by other investigators or compiled by the kepler team. to comp... | spikes: precision warm spitzer photometry of the kepler field |
we are conducting a survey of high-resolution near-infrared co rovibrational spectra in protoplanetary disks around young intermediate-mass stars. we use irtf-ishell with the 0"375 and 0"75 slits, providing 4 km s-1 and 6 km s-1 resolution and covering 4.52-5.25 μm in one single exposure. this includes part of the rovi... | an irtf-ishell survey of 4.52-5.25 μm co spectra in protoplanetary disks of intermediate-mass stars: preliminary sample and analysis |
a comprehensive description of eso in the current global astronomical context, and its plans for the next decade and beyond, are presented. this survey covers all aspects of the organisation, including the optical-infrared programme at the la silla paranal observatory, the submillimetre facilities alma and apex, the co... | reaching new heights in astronomy - eso long term perspectives |
the 4-meter multi-object spectroscopic telescope (4most) is a wide-field, high-multiplex spectroscopic survey facility under development for the visible and infrared survey telescope for astronomy (vista) of the european southern observatory (eso). the primary and secondary mirrors (m1 and m2) together with the wide fi... | wide-field corrector for 4most: design details and maiv processes |
india and belgium have jointly established two 4-meter class optical telescopes at devasthal located in nainital, india. after successful installation of the 3.6-m modern new technology devasthal optical telescope (dot) in 2015, it was technically activated by premiers of both countries from brussels on march 30, 2016.... | scientific potential of the indo-belgian 3.6-m dot in the field of galactic astronomy |
the recently commissioned 3.6-m devasthal optical telescope has been used for various tests and science observations using three main instruments, namely, a charge-coupled device camera, a near-infrared camera, and an optical imager-cum-spectrograph. the published results from these instruments assert that the performa... | global performance and capabilities of the instruments on the 3.6-m devasthal optical telescope |
fine-structure line emission from [ne ii] is observed in the infrared (12.81 μm) and could serve as a diagnostic of x-ray irradiation in protoplanetary disks. [ne ii] emission may also trace the disk gas and indicate the presence of shocks due to outflows. as the electron fraction decreases with decreasing height from ... | fine-structure excitation of ne+ in collision with atomic hydrogen |
we report the discovery of an exoplanet from the analysis of the gravitational microlensing event ogle-2015-blg-1649 that challenges the core accretion model of planet formation and appears to support the disk instability model. the planet/host-star mass ratio is q = 7.2 × 10-3 and the projected separation normalized t... | ogle-2015-blg-1649lb: a gas giant planet around a low-mass dwarf |
with the imminent launch of the jwst, the field of thermal-infrared (tir) astronomy will enjoy a revolution. it is easy to imagine that all areas of infrared (ir) astronomy will be greatly advanced, but perhaps impossible to conceive of the new vistas that will be opened. to allow both follow-up jwst observations and a... | the key science drivers for michi: a thermal-infrared instrument for the tmt |
cometary outbursts offer a valuable window into the composition of comet nuclei with their forceful ejection of dust and volatiles in explosive events, revealing the interior components of the comet. understanding how different types of outbursts influence the dust properties and volatile abundances, to better interpre... | analysis of hybrid gas-dust outbursts observed at 67p/churyumov-gerasimenko |
we describe the design and commissioning of a simple prototype, low-cost 10 μm imaging instrument. the system is built using commercially available components including an uncooled microbolometer array as a detector. the incorporation of adjustable germanium reimaging optics rescale the image to the appropriate plate s... | uncooled microbolometer arrays for ground-based astronomy |
debris disks around stars are considered as components of planetary systems. constraining the dust properties of these disks can give crucial information to formation and evolution of planetary systems. as an all-sky survey, infrared astronomical satellite (iras) gave great contribution to the debris disk searching whi... | a wise view of iras debris disks: revising the dust properties |
we present a photometric redshift (photo-$z$) estimation technique for galaxies in the p\lowercase{an}-starrs1 (ps1) $3\pi $ survey. specifically, we train and test a regression and a classification random-forest (rf) models using photometric features (magnitudes, colors and moments of the radiation intensity) from the... | photometric redshift estimation of galaxies in the p\\lowercase{an}-starrs 3$\\pi$ survey- i. methodology |
understanding how the protoplanetary disks around young stars are structured and evolve is crucial for star and planet formation theories. we observed in an homogeneous way several tens of herbig ae/be and t tauri disks with the vlti/gravity instrument in the near-infrared k-band. we aim at spatially resolving the sub ... | the innermost regions of young stellar objects as seen by vlti/gravity |
galaxies change their properties as they assemble into clusters. in order to understand the physics behind that, we need to go back in time and observe directly what is occurring in galaxies as they fall into a cluster. we have conducted a narrowband and j-band imaging survey on a cluster cl1604-d at z = 0.923 using a ... | environmental impact on star-forming galaxies in a z ∼ 0.9 cluster during the course of galaxy accretion |
cea and lynred develop very large focal plane arrays (fpa) in the short wave infrared range (swir) with ultra-low dark current for space and astronomy applications. the structure of such arrays is based on a hgcdte sensitive layer flipchipped onto a si roic. this roic is based on a source follower per detector input an... | roic glow reduction in very low flux short wave infra-red focal plane arrays for astronomy |
we present the optomechanical design of the potsdam arrayed waveguide spectrograph (paws), which is the first on-sky demonstrator of an integrated photonic spectrograph specifically designed and optimized for astronomy. the instrument is based on an arrayed waveguide grating (awg) that was designed by and custom fabric... | optomechanical design of paws, the potsdam arrayed waveguide spectrograph |
we report on the first on-sky sensitivity test on a single arm of the astronomical light optical hybrid analysis (aloha) instrument, an uncooled up-conversion interferometer in the l band (3.5 μm). despite a low coupling efficiency (in the range of 1 per cent) between the 1-m class telescope and our instrument, we dete... | towards a mid-infrared l band up-conversion interferometer: first on-sky sensitivity test on a single arm |
we present the initial design, performance improvements and science opportunities for an upgrade to the field-imaging far-infrared line spectrometer (fifi-ls). fifi-ls efficiently measures fine structure cooling lines, delivering critical constraints of the interstellar medium and starforming environments. sofia provid... | upgrading the field-imaging far-infrared line spectrometer for the stratospheric observatory for infrared astronomy (sofia) with kids: enabling large sample (extragalactic) surveys |
we studied the properties of internetwork magnetic fields in the solar photosphere, taking advantage of full-disk stokes v/i maps of the fe i 1564.8 nm line, which were obtained during 2010-2019. in contrast to most previous studies, we used data with moderate spatial and spectral resolutions. nonetheless, we were able... | internetwork magnetic fields seen in fe i 1564.8 nm full-disk images |
this work aims to present a new miniature spectrometer in the mid infrared (l band), using the swifts (stationary wave integrated fourier transform spectrometer) technology. a stationary wave obtained by injecting light on both sides of a channel waveguide (gabor configuration) is sampled using nano-scattering centres ... | development of mid-ir waveguides to implement high resolution spectrometers in integrated optics |
saphira (320x256/24μm) is the first of a family of hgcdte apd infrared sensors for nir/swir sensing in low flux conditions for scientific applications. the paper will present the status of the latest developments of detectors suitable for a range of ground and space applications including wavefront sensing, low flux im... | developments in the saphira family of hgcdte apd infrared arrays for low flux sensing: present and future |
e report a latest generation of the laser frequency comb (lfc) for astronomy. the new features include all fiber coupled, alignment-free filter cavities; specially designed photonic crystal fiber for spectral broadening; reflective spectral flattening systems. all the features ensure the long-term stability of the whol... | 20 ghz astronomical laser frequency comb with super-broadband spectral coverage |
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