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this article reflects my personal experience and illustrates some developments in the field of planetary spectroscopy, achieved within the planetology group of paris observatory over the past fifty years. over these decades, planetary spectroscopy has led to the identification of minor atmospheric species with mixing r... | invited review: infrared spectroscopy of planetary atmospheres: searching for insights into their past and present histories |
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 |
we report on the implementation of a mid-infrared (mir) interferometer prototype for furthermore application in the framework of high-resolution imaging in astronomy. this paper demonstrates the possibility to extend to the l band our experimental study performed on the up-conversion interferometer in h band. this in-l... | in-lab aloha mid-infrared up-conversion interferometer with high fringe contrast @λ = 3.39 μm |
this paper gives an overview of the astronomical light optical hybrid analysis (aloha) project dedicated to investigate a new method for high resolution imaging in mid infrared astronomy. this proposal aims to use a non-linear frequency conversion process to shift the thermal infrared radiation to a shorter wavelength ... | aloha—astronomical light optical hybrid analysis. from experimental demonstrations to a mir instrument proposal |
recent infrared observations at 1.5-4.0 μm using large ground-based telescopes have suggested that cl-bearing salts are likely present on europa's surface as non-ice materials. the chemical compositions of those cl-bearing salts are key to understanding europa's ocean chemistry and habitability. here we report the resu... | aspatially resolved observations of europa's surface with subaru/ircs at 1.0-1.8 μm: upper limits to the abundances of hydrated cl-bearing salts |
we review astronomical results in the visible (λ<1μm) with adaptive optics. other than a brief period in the early 1990s, there has been little (<1 paper/yr) night-time astronomical science published with ao in the visible from 2000-2013 (outside of the solar or space surveillance astronomy communities where visi... | a review of astronomical science with visible light adaptive optics |
the study of minor chemical species in terrestrial planets' atmospheres can teach us about the chemistry, dynamics and evolution of the atmospheres through time. phosphine or methane on terrestrial planets are potential biosignatures, such that their detection may signify the presence of life on a planet. therefore, th... | from atmospheric evolution to the search of species of astrobiological interest in the solar system—case studies using the planetary spectrum generator |
the far-infrared spectrum of hc3 n has been recorded at high resolution between 70 and 500 cm-1using synchrotron radiation. four prominent features, i.e., ν7, ν6 -ν7 , ν4 -ν6 , and 2ν7 have been identified in the spectrum together with many associated hot bands. in addition, rotational transitions for the interacting v... | synchrotron-based far-infrared spectroscopy of hc3 n : extended ro-vibrational analysis and new line list up to 3360 cm-1 |
we use near-infrared observations obtained as part of the visible and infrared survey telescope for astronomy (vista) survey of the magellanic clouds (vmc), as well as two complementary hubble space telescope (hst) data sets, to study the luminosity and mass functions (mfs) as a function of clustercentric radius of the... | the vmc survey. xviii. radial dependence of the low-mass, 0.55--0.82 m stellar mass function in the galactic globular cluster 47 tucanae |
here, we report on the first successful exoplanet transit observation with the stratospheric observatory for infrared astronomy (sofia). we observed a single transit of the hot jupiter hd 189733 b, obtaining two simultaneous primary transit lightcurves in the b and z‧ bands as a demonstration of sofia's capability to p... | first exoplanet transit observation with the stratospheric observatory for infrared astronomy: confirmation of rayleigh scattering in hd 189733 b with the high-speed imaging photometer for occultations |
the lack of a large-aperture optical/infrared telescope has seriously affected the development of astronomy in china. in 2016, the authors published their concept study and suggestions for a 12-m telescope optical system. this article presents the authors' further research and some new results. considering that this te... | the optical system of the proposed chinese 12-m optical/infrared telescope |
the infrared solar spectrum contains a wealth of physical data about the sun and is being explored using modern detectors and technology with new ground-based solar telescopes. one such instrument will be the ground-based cryogenic near-ir spectro-polarimeter of the daniel k. inouye solar telescope (dkist), which will ... | a spectroscopic survey of infrared 1-4 μm spectra in regions of prominent solar coronal emission lines of fe xiii, si x, and si ix |
observations that require large physical instrument dimensions and/or a considerable amount of cryogens, as it is the case for high spatial resolution far infrared (fir) astronomy, currently still face technological limits for their execution from space. angular resolution and available observational capabilities are p... | stratospheric balloons as a platform for the next large far infrared observatory |
this paper is based on 2mass photometry (jhk_s magnitudes) of 1172 be stars. the observed mean intrinsic colours have been derived with aid of two-colour diagrams for be stars of luminosity classes ie-iie, iiie and ive-ve. the obtained results are the first determinations of their intrinsic colours in the astronomical ... | intrinsic colour indices of be stars obtained from 2mass photometry |
in this study, a fourier transform spectrum of niobium (nb) is investigated in the near-infrared spectral range from 6000 to 12,000 cm-1 (830-1660 nm). the nb spectrum is produced using a hollow cathode discharge lamp in an argon atmosphere. both nb and ar spectral lines are visible in the spectrum. a total of 110 spec... | high-resolution fourier transform spectroscopy of nb i in the near-infrared |
in this work, we present a new methodology to fit the observed and synthetic spectrum of solar-like stars at millimeter, submillimeter, and infrared wavelengths through semiempirical models of the solar chromosphere. we use the levenberg-marquardt algorithm as a nonlinear method, pakalmpi as the semiempirical model of ... | nonlinear convergence of solar-like stars chromospheres using millimeter, submillimeter, and infrared observations |
we report observations of the apollo-class potentially hazardous asteroid 1981 midas, which passed 0.090 au from earth (35 lunar distances) on 2018 march 21. during this close approach, midas was observed by radar both from the arecibo observatory on march 21 through 25 (five nights) and from nasa's goldstone deep spac... | radar and lightcurve observations and a physical model of potentially hazardous asteroid 1981 midas |
chopping observations with a tip-tilt secondary mirror have conventionally been used in ground-based mid-infrared observations. however, it is not practical for next generation large telescopes to have a large tip-tilt mirror that moves at a frequency larger than a few hertz. we propose an alternative observing method,... | "slow-scanning" in ground-based mid-infrared observations |
a comprehensive, hyperfine-resolved rotation-vibration line list for the ammonia molecule (14nh3) is presented. the line list, which considers hyperfine nuclear quadrupole coupling effects, has been computed using robust, first principles methodologies based on a highly accurate empirically refined potential energy sur... | a hyperfine-resolved rotation-vibration line list of ammonia (nh3) |
the diffuse interstellar bands, or dibs, are a large set of absorption features, mostly at optical and near infrared wavelengths, that are found in the spectra of reddened stars and other objects. they arise in interstellar gas and are observed toward numerous objects in our galaxy as well as in other galaxies. althoug... | the diffuse interstellar bands - a brief review |
the high-resolution mid-infrared spectrometer (hirmes) is the 3rd generation instrument for the stratospheric observatory for infrared astronomy (sofia), currently in development at the nasa goddard space flight center (gsfc), and due for commissioning in 2019. by combining direct-detection transition edge sensor (tes)... | sofia-hirmes: looking forward to the high-resolution mid-infrared spectrometer |
a compact and robust coherent laser light source that provides spectral coverage from the ultraviolet to infrared is desirable for numerous applications, including heterodyne super resolution imaging[1], broadband infrared microscopy[2], protein structure determination[3], and standoff atmospheric trace-gas detection[4... | a six-octave optical frequency comb from a scalable few-cycle erbium fiber laser |
since z∼ 1, the stellar mass density locked in low-mass groups and clusters has grown by a factor of ∼8. here, we make the first statistical measurements of the stellar mass content of low-mass x-ray groups at 0.5\lt z\lt 1, enabling the calibration of stellar-to-halo mass scales for wide-field optical and infrared sur... | the stellar mass-halo mass relation for low-mass x-ray groups at 0.5< z< 1 in the cdfs with csi |
the debris disk around the vega-type star hd 34700 is detected in dust thermal emission from the near-infrared (ir) to millimeter (mm) and submm wavelength range. also detected is a distinct set of emission features at 3.3, 6.2, 7.7, 8.6, 11.3, and 12.7 μ {{m}}, which are commonly attributed to polycyclic aromatic hydr... | dust and polycyclic aromatic hydrocarbon in the hd 34700 debris disk |
stellar population and the interstellar gas-dust medium in the vicinity of the open star cluster vdb 130 are analysed using optical observations taken with the 6 m telescope of the special astrophysical observatory of russian academy of sciences and the 125 cm telescope of the sternberg astronomical institute, lomonoso... | star-forming regions at the periphery of the supershell surrounding the cyg ob1 association - i. the star cluster vdb 130 and its ambient gas and dust medium |
improved measurement and calibration of detector behaviors will be crucial for future space missions, particularly those aiming to tackle outstanding questions in cosmology and exoplanet research. similarly, many small detector effects, such as the nearest-neighbor interactions of the brighter-fatter effect and interpi... | blooming in h2rg arrays: laboratory measurements of a second brighter-fatter type effect in hgcdte infrared detectors |
we report distance measurements for the norma cluster based on the near-infrared j- and ks-band fundamental plane (fp) relations. our simultaneous j- and ks-band photometry analyses were performed using 31 early-type galaxies in the nearby norma cluster obtained using the 1.4 m infrared survey facility (irsf) at the so... | the distance and peculiar velocity of the norma cluster (aco3627) using the near-infrared j- and ks-band fundamental plane relations |
close-in extrasolar giant planets are expected to cool their thermospheres by producing h3+ emission in the near-infrared (nir), but simulations predict h3+ emission intensities that differ in the resulting intensity by several orders of magnitude. we want to test the observability of h3+ emission with crires at the ve... | a crires-search for h3+ emission from the hot jupiter atmosphere of hd 209458 b |
context. the asteroid redirect mission (arm) under development by nasa is being planned to collect a multi-meter boulder from a near-earth asteroid (nea), and to bring it to the cis-lunar space in the mid-2020's for future study and exploitation by a crewed mission. the marcopolo-m5 project is being proposed in 2016 fo... | an investigation of the low-δv near-earth asteroids (341843) 2008 ev5 and (52381) 1993 ha. two suitable targets for the arm and marcopolo-m5 space missions |
ngc 4945 harbors one of the nearest active galactic nuclei (agns), which allows us to reach high spatial resolution with current observational facilities. the seyfert 2 nucleus is deeply obscured by an edge-on disk with av~ 14, requiring infrared observations to study circumnuclear structures and the interstellar mediu... | an infrared view of the obscured agn environment in ngc 4945 |
the astronomy community has at its disposal a large back catalog of public spectroscopic galaxy redshift surveys that can be used for the measurement of luminosity functions (lfs). utilizing the back catalog with new photometric surveys to maximum efficiency requires modeling the color selection bias imposed on the sel... | the 2.4 μm galaxy luminosity function as measured using wise. i. measurement techniques |
we present a transit-timing variation (ttv) and planetary atmosphere analysis of the neptune-mass planet hat-p-26 b. we present a new set of 13 transit light curves from optical ground-based observations and combine them with light curves from the wide field camera 3 on the hubble space telescope, the transiting exopla... | revisiting the transit timing and atmosphere characterization of the neptune-mass planet hat-p-26 b |
we measured the precise masses of the host and planet in the ogle-2003-blg-235 system, when the lens and source were resolving, with 2018 keck high resolution images. this measurement is in agreement with the observation taken in 2005 with the hubble space telescope (hst). in the 2005 data, the lens and sources were no... | confirmation of color-dependent centroid shift measured after 1.8 years with hst |
observations that require large physical instrument dimensions and/or a considerable amount of cryogens, as it is for example the case for high spatial resolution far infrared astronomy, currently still face technological limits for their execution from space. the high cost and finality of space missions furthermore ca... | stratospheric balloons as a complement to the next generation of astronomy missions |
context. the analysis of debris disk observations is often based on the assumption of a dust phase composed of compact spherical grains consisting of astronomical silicate. instead, observations indicate the existence of water ice in debris disks.aims: we quantify the impact of water ice as a potential grain constituen... | the impact of the presence of water ice on the analysis of debris disk observations |
large potentially hazardous asteroids (phas) are capable of causing a global catastrophe in the event of a planetary collision. thus, rapid assessment of such an object's physical characteristics is crucial for determining its potential risk scale. we treated the near-earth asteroid (99942) apophis as a newly discovere... | neowise observations of the potentially hazardous asteroid (99942) apophis |
2mass j20395358+4222505 is an obscured early b supergiant near the massive ob star association cygnus ob2. despite its bright infrared magnitude (ks = 5.82) it has remained largely ignored because of its dim optical magnitude (b = 16.63, v = 13.68). in a previous paper, we classified it as a highly reddened, potentiall... | the nature of the cygnus extreme b supergiant 2mass j20395358+4222505 |
we present statistics on the number of refereed astronomy journal articles that used data from nasa's spitzer space telescope through the end of the calendar year 2020. we discuss the various types of science programs and science categories that were used to collect data during the mission and discuss how operational c... | spitzer publication statistics |
the spitzer infrared intensive transients survey (spirits) searched for luminous infrared (ir) transients and variables in nearly 200 nearby galaxies from 2014 to 2019, using the warm spitzer telescope at 3.6 and 4.5 μm. among the spirits variables are ir-bright objects that are undetected in ground-based optical surve... | hubble space telescope imaging of luminous extragalactic infrared transients and variables from the spitzer infrared intensive transients survey |
we present integral field, far-infrared (fir) spectroscopy of mrk 54, a local lyman continuum emitter, obtained with fifi-ls on the stratospheric observatory for infrared astronomy. this is only the second time, after haro 11, that [c ii] 158 μm and [o iii] 88 μm spectroscopy of the known lces have been obtained. we fi... | detections of [c ii] 158 μm and [o iii] 88 μm in a local lyman continuum emitter, mrk 54, and its implications to high-redshift alma studies |
we present 2007-2020 spex visnir spectral monitoring of the highly variable rw aur a ctts. we find direct evidence for a highly excited, ir-bright, asymmetric, and time-variable system. comparison of the spectral and temporal trends found determines five different components: (1) a stable continuum from 0.7 to 1.3 μm, ... | rw aur a: spex spectral evidence for differentiated planetesimal formation, migration, and destruction in an3 myr old excited ctts system |
the extremely large telescope and the thirty meter telescope will use state of the art multiconjugate adaptive optics (mcao) systems to obtain the full d 4 advantage that their apertures can provide. however, to reach the full astrometric potential of these facilities for on-sky science requires understanding any resid... | optimal differential astrometry for multiconjugate adaptive optics. i. astrometric distortion mapping using on-sky gems observations of ngc 6723 |
a detailed optical and infrared photometric analysis of the open star cluster ic 361 is given in the present paper. on studying the radial density profile, radial extent of the cluster is found to be 8.0 ±0.5 arcmin. the basic physical parameters of the cluster such as e (b -v )=0.56 ±0.10 mag, e (v -k )=1.72 ±0.12 mag... | a near-infrared and ubvri photometric analysis of the open cluster ic 361 |
the wide field infrared survey telescope (wfirst) coronagraph instrument (cgi) will be the first high-performance stellar coronagraph using active wavefront control for deep starlight suppression in space, providing unprecedented levels of contrast, spatial resolution, and sensitivity for astronomical observations in t... | the potential of exozodiacal disks observations with the wfirst coronagraph instrument |
east anatolian observatory's dag telescope, with its 4m diameter primary mirror and vis/ir observation capability, will be located on the konaklı-karaya summit at an altitude of 3170 m, near the city of erzurum, turkey. containing both active optics (ao) and adaptive optics (ao) systems, the first light for dag is expe... | eastern anatolia observatory (dag): the status in 2020 |
the james webb space telescope (jwst) is the scientific successor to the hubble space telescope. it is a cryogenic infrared space observatory with a 25 m2 aperture (6 m class) telescope that will achieve diffraction limited angular resolution at a wavelength of 2 um. the science instrument payload includes four passive... | the jwst science instrument payload: mission context and status |
the spectroscopic measurement of the cosmic microwave background at mm and sub-mm wavelengths received significant attention recently, aimed at measuring tiny spectral distortions of the cosmic microwave background (cmb) relevant for cosmology. several experiments, including olimpo (masi et al. 2003), prism (andré et a... | polarizing beam-splitter rotation in martin-puplett interferometers for spectroscopic measurements at millimeter wavelengths |
to meet the ambitious science goal of characterizing exo-earths via direct imaging and spectroscopy, future space-based astronomical telescopes will have requirements for optical stability at least several orders of magnitude beyond the current state of the art. mission concepts requiring stability on the order of pico... | large ultra-stable telescope system study |
we report nasa-dlr sofia upgreat circumstellar [o i] 63.2 μm and [c ii] 157.7 μm emission profiles and fifi-ls [o i] 63.2 μm, [o i] 145.5 μm, and [c ii] 157.7 μm fluxes obtained shortly after betelgeuse's 2019/2020 great dimming event. haas et al. noted a potential correlation between the [o i] 63.2 μm flux and v magni... | sofia upgreat/fifi-ls emission-line observations of betelgeuse during the great dimming of 2019/2020 |
from astronomy to the surveying of greenhouse gases, a wide range of science and engineering applications rely on the detection of mid-infrared (mid-ir) photons. however, because photons from the mid-ir have less than a tenth of the energy of the visible range, the detection is not as easy as taking a photo with a came... | room-temperature mid-infrared detectors |
the abundance of hydrogen sulfide, h2s, is underpredicted in standard astrophysical models and, thus, so are the effects of its rich chemistry. its cation, h2s+, may have a similarly understated effect on the interstellar medium (ism) but, unlike its neutral parent, its presence in the ism is unconfirmed. advancing the... | astrophysical sulfur in diffuse and dark clouds: the fundamental vibrational frequencies and spectroscopic constants of hydrogen sulfide cation (h2s+) |
winered is a highly sensitive near-infrared (nir) high-resolution spectrograph. the spectral coverage is 0.90 to 1.35μm (z, y, j-bands) and the spectral resolutions are r = 28,000 (wide-mode, covering an entire winered's wavelength region with a single exposure) and r = 70,000 (hires-modes, covering either y- or j-band... | very high-sensitive nir high-resolution spectrograph winered: on-going observations at ntt |
the center for detectors at rochester institute of technology and raytheon vision systems (rvs) are leveraging rvs capabilities to produce large format, short-wave infrared hgcdte focal plane arrays on silicon (si) substrate wafers. molecular beam epitaxial (mbe) grown hgcdte on si can reduce detector fabrication costs... | large format mbe hgcdte on silicon detector development for astronomy |
the leonardo (formerly selex es) saphira 320 x 256 @24μm pitch l-apd movpe hgcdte array is now generally accepted as the sensor of choice for near infrared (nir - 0.8 to 2.5μm) adaptive optics (ao) wavefront (wf) sensing using natural guide stars. with larger formats and improved readout integrated circuits (roics), th... | towards the next generation of l-apd movpe hgcdte arrays: beyond the saphira 320 x 256 |
the magdalena ridge observatory interferometer (mroi) has been under development for almost two decades. initial funding for the facility started before the year 2000 under the army and then navy, and continues today through the air force research laboratory. with a projected total cost of substantially less than $200m... | the magdalena ridge observatory interferometer: first light and deployment of the first telescope on the array |
the 4-metre multi-object spectroscopic telescope (4most) is a fiber-fed multi-object spectrograph for the vista telescope at the european southern observatory (eso) paranal observatory in chile. the goal of the 4most project is to create a general purpose and highly efficient spectroscopic survey facility for astronome... | assembly and alignment of the 4-metre multi-object spectroscopic telescope wide field corrector |
this is the fourth article in a series studying on the site-testing at muztagh-ata site. the results of the characterization of precipitable water vapor (pwv) in the atmospheric column at muztagh-ata site are presented. this paper studies the temporal variability of pwv, acquired from remote sensing data sets and valid... | site-testing at muztagh-ata site. iv. precipitable water vapor |
jupiter's trojan asteroids (hereafter trojans) make up a large group of primitive bodies that carry insight into the formation mechanisms that shaped our solar system. mid-infrared (mir; 5-35 µm) spectra of trojans exhibit puzzling silicate emission features, similar to spectra of optically thin comet comae – an odd fi... | mid-infrared spectral studies of jovian trojan asteroids and the effects of regolith porosity |
the extragalactic background light (ebl) is the radiation accumulated through the history of the universe in the wavelength range from the ultraviolet to the far infrared. local foregrounds make the direct measurement of the diffuse ebl notoriously difficult, while robust lower limits have been obtained by adding up th... | measurement of the ebl through a combined likelihood analysis of gamma-ray observations of blazars with the magic telescopes |
ultraluminous quasars (m1450 ≤ -29) provide us with a rare view into the nature of the most massive and most rapidly accreting supermassive black holes (smbhs). following the discovery of two of these extreme sources, j0341+1720 (m1450 = -29.56, z = 3.71) and j2125-1719 (m1450 = -29.39, z = 3.90), in the extremely lumi... | a closer look at two of the most luminous quasars in the universe |
the origins space telescope (ost) is the mission concept for the far-infrared surveyor, one of the four science and technology definition studies of nasa headquarters for the 2020 astronomy and astrophysics decadal survey. "concept-1" is a cold (4 k) 9 m space telescope with five instruments, while "concept 2" consists... | origins space telescope: the far infrared imager and polarimeter fip |
astronomical spectroscopic observations from ground-based telescopes contain background emission lines from the terrestrial atmosphere's airglow. in the near infrared, this background is composed mainly of emission from meinel bands of hydroxyl (oh), which is produced in highly excited vibrational states by reduction o... | optimizing hydroxyl airglow retrievals from long-slit astronomical spectroscopic observations |
phase fluctuations introduced by the atmosphere are the main limiting factor in attaining diffraction limited performance in extended interferometric arrays at millimeter and submillimeter wavelengths. we report the results of c-pacs, the combined array for research in millimeter-wave astronomy paired antenna calibrati... | the carma paired antenna calibration system: atmospheric phase correction for millimeter wave interferometry and its application to mapping the ultraluminous galaxy arp 193 |
in the solar corona, the free energy, i.e., the excess in magnetic energy over a ground-state potential field, forms the reservoir of energy that can be released during solar flares and coronal mass ejections. such free energy provides a measure of the magnetic field nonpotentiality. recent theoretical and observationa... | designing a new coronal magnetic field energy diagnostic |
although large polycyclic aromatic hydrocarbons (pahs) are likely to be responsible for ir emission of gaseous and dusty regions, their neutral experimental high-resolution gas-phase ir spectra-needed to construct accurate astronomical models-have so far remained out of reach because of their nonvolatility. applying la... | infrared spectroscopy of jet-cooled "grandpahs" in the 3-100 μm region |
mid-infrared (ir) photometry of r coronae borealis stars obtained from various satellites from infrared astronomical satellite (iras) to wide-field infrared survey explorer (wise) has been utilized in studying the variations of the circumstellar dust's contributions to the spectral energy distribution of these stars. t... | mid-infrared variations of r coronae borealis stars |
simcado is the instrument data simulation software for the e-elt's near-infrared wide-field imaging camera - micado. written in python, simcado allows the user to simulate possible future observations of astronomical objects with the 39m european extremely large telescope (e-elt). in these proceedings we present a brie... | simcado - a python package for simulating detector output for micado at the e-elt |
in this paper we present initial test results of the near infrared readout and controller asic (nirca), designed for large area image sensors under contract from the european space agency (esa) and the norwegian space center. the asic is designed to read out image sensors based on mercury cadmium telluride (hgcdte, or ... | preliminary validation results of an asic for the readout and control of near-infrared large array detectors |
we present the data reduction pipeline, mead, for arizona lenslets for exoplanet spectroscopy (ales), the first thermal infrared integral field spectrograph designed for high-contrast imaging. ales is an upgrade of lmircam, the 1 - 5 μm imaging camera for the large binocular telescope, capable of observing astronomical... | mead: data reduction pipeline for ales integral field spectrograph and lbti thermal infrared calibration unit |
context. the assignment of the mid-infrared (mid-ir) emission features and plateaus observed in c-rich and h-rich regions of the interstellar medium (ism) is still debated. such mid-ir assignments must also be related to their contribution to the extinction curve in our galaxy and to the ultraviolet (uv) bump.aims: the... | spectroscopic investigation of interstellar hydrogenated carbon clusters. infrared and optical spectra of c24hn populations |
accurate atomic parameters, such as transition probabilities, wavelengths, and energy levels, are indispensable for the analysis of stellar spectra and the obtainment of chemical abundances. however, the quantity and quality of the existing data in many cases lie far from the current needs of astronomers, creating an a... | the laboratory astrophysics spectroscopy programme at imperial college london |
the next decade will see two large-scale space-based near-infrared surveys, euclid and wfirst. this paper shows that the subtle differences between the filters proposed for these surveys and those from ground-based photometric systems will produce a ground-space colour term that is dependent on water absorption in the ... | detecting free-floating planets using water-dependent colour terms in the next generation of infrared space-based surveys |
the aim of the lunar legacy project is to map the distribution of water on the moon's surface through the detection and characterization of the 6 μm spectral band indicative of molecular water. spectra were taken with the faint object infrared camera for the sofia telescope instrument on the stratospheric observatory f... | sofia+forcast lunar legacy project processing procedure |
we report the results of wide field co mapping in the region of iras 19312+1950. this infrared astronomical satellite (iras) object exhibits sio/h2o/oh maser emission, and is embedded in a chemically rich molecular component, the origin of which is still unknown. in order to reveal the entire structure and gas mass of ... | wide field co mapping in the region of iras 19312+1950 |
context. the transneptunian region of the solar system is populated by a wide variety of icy bodies showing great diversity in orbital behavior, size, surface color, and composition.aims: the dwarf planet (136108) haumea is among the largest transneptunian objects (tnos) and is a very fast rotator (~3.9 h). this dwarf ... | near-infrared spatially resolved spectroscopy of (136108) haumea's multiple system |
the crystalline silicate features are mainly reflected in infrared bands. the spitzer infrared spectrograph (irs) collected numerous spectra of various objects and provided a big database to investigate crystalline silicates in a wide range of astronomical environments. we apply the manifold ranking algorithm to perfor... | a systematic search for the spectra with features of crystalline silicates in the spitzer irs enhanced products |
we report on our follow-up spectroscopy of hd 1071478 b, a recently detected faint co-moving companion of the exoplanet host star hd 107148 a. the companion is separated from its primary star by about 35 arcsec (or 1790 au of projected separation) and its optical and near infrared photometry is consistent with a white ... | follow-up spectroscopic observations of hd 107148 b: a new white dwarf companion of an exoplanet host star |
hexamethylenetetramine (hmt), c6n4h12 is a spherical top with nine ir-active modes. because of its relevance for astrophysics, we recorded the absorption spectra in the full range of its fundamental bands. in total, we detected eight fundamental bands and recently published the rotational analysis of the four most inte... | synchrotron-based fourier transform spectra of the ν23 and ν24 ir bands of hexamethylenetetramine c6n4h12 |
we collect all known intrinsic and extrinsic s-type stars to discuss their infrared properties and find their difference in the infrared using photometric data from the two micron all sky survey, wide field infrared survey explorer, and infrared astronomical satellite missions. then we look for the diagnosis to extract... | a new infrared photometric study of intrinsic and extrinsic s-type stars |
we report on the detection of hot co2 in the o-rich asymptotic giant branch star r leo based on high spectral resolution observations in the range 12.8-14.3 μm carried out with the echelon-cross-echelle spectrograph (exes) mounted on the stratospheric observatory for infrared astronomy (sofia). we found ≃240 co2 emissi... | detection of infrared fluorescence of carbon dioxide in r leonis with sofia/exes |
we validate the weather research and forecasting (wrf) model for precipitable water vapour (pwv) forecasting as a fully operational tool for optimizing astronomical infrared observations at roque de los muchachos observatory (orm). for the model validation, we used gnss-based (global navigation satellite system) data f... | precipitable water vapour forecasting: a tool for optimizing ir observations at roque de los muchachos observatory |
recent instrumentation projects have allocated resources to develop codes for simulating astronomical images. physics-based models are essential for understanding telescope, instrument, and environmental systematics in observations. a deep understanding of these systematics is especially important in the context of wea... | phosim-nircam: photon-by-photon image simulations of the james webb space telescope's near-infrared camera |
a review of modernization and growth of ground based optical and near-infrared astrophysical observational facilities in the globe attributed to the recent technological developments in optomechanical, electronics and computer science areas is presented. hubble space telescope (hst) and speckle and adaptive ground base... | a global prospective of the indian optical and near-infrared observational facilities in the field of astronomy and astrophysics: a review |
high obscuration of background stars behind dark clouds precludes the detection of optical diffuse interstellar bands (dibs) and hence our knowledge of dib carriers in these environments. taking advantage of the reduced obscuration of starlight in the near-infrared (nir) we used one of the strongest nir dibs at 15 273 ... | the 15 273 å diffuse interstellar band in the dark cloud barnard 68 |
the fundamental science question we address in this research concerns the evolution of asteroid families; more specifically, does asteroid (6) hebe have a genetic family, and does this genetic family provide insight into the structure of (6) hebe? hebe has been identified dynamically and spectroscopically as the h-chon... | the family of (6) hebe |
we present pre-perihelion infrared 8-31 μm spectrophotometric and imaging observations of comet c/2012 k1 (pan-starrs), a dynamically new oort cloud comet, conducted with nasa's stratospheric observatory for infrared astronomy facility (+forcast) in 2014 june. as a “new” comet (first inner solar system passage), the co... | sofia infrared spectrophotometry of comet c/2012 k1 (pan-starrs) |
although high-resolution spectra of the cn red-system band are considered useful in cometary sciences, e.g., in the study of isotopic ratios of carbon and nitrogen in cometary volatiles, there have been few reports to date due to the lack of high-resolution (r ≡ λ/δλ > 20,000) spectrographs in the near-infrared regi... | near-infrared spectroscopic observations of comet c/2013 r1 (lovejoy) by winered: cn red-system band emission |
aims: we investigate the temporal and spectral behaviour of four polar cataclysmic variables from the infrared to x-ray regimes, refine our knowledge of the physical parameters of these systems at different accretion rates, and search for a possible excess of soft x-ray photons.methods: we obtained and analysed four xm... | x-ray and optical observations of four polars |
synthetic observations produced from radiative magnetohydrodynamic simulations have predicted that higher polarization fractions in the quiet solar photosphere would be revealed by increasing the total integration time of observations at gregor resolutions. we present recently acquired disk center observations of the f... | exploring magnetic loops and serpentine fields in the quiet sun with the gris-ifu |
with the advent of large-scale photometric surveys of the sky, modern science witnesses the dawn of big data astronomy, where automatic handling and discovery are paramount. in this context, classification tasks are among the key capabilities a data reduction pipeline must possess in order to compile reliable data sets... | automated classification of eclipsing binary systems in the vvv survey |
we introduce a new framework for point-spread function subtraction based on the spatiotemporal variation of speckle noise in high-contrast imaging data where the sampling timescale is faster than the speckle evolution timescale. one way that space-time covariance arises in the pupil is as atmospheric layers translate a... | speckle space-time covariance in high-contrast imaging |
gaia is a revolutionary space mission developed by esa and is delivering 5 parameter astrometry, photometry and radial velocities over the whole sky with astrometric accuracies down to a few tens of micro-arcseconds. a weakness of gaia is that it only operates at optical wavelengths. however, much of the galactic centr... | astro2020 activity, project of state of the profession consideration (apc) white paper: all-sky near infrared space astrometry. state of the profession considerations: development of scanning nir detectors for astronomy |
the astronomical j-band (1.25 micrometres) is a relatively untapped wave-band in long-baseline infrared interferometry. it allows access to the photosphere in giant and super-giant stars relatively free from opacities of molecular bands. the j-band can potentially be used for imaging spots in the 1350 nm ionised iron l... | a six-apertures discrete beam combiners for j-band interferometry |
we select 13 nearby spiral galaxies from the nearby galaxies legacy survey (ngls) project and perform spectral energy distribution fitting for each galaxy applying two-component modified blackbody models on a global scale aim to probe the potential submillimeter (submm) excess. we find that ngc 2976, ngc 3351, and ngc ... | dissecting the global cold dust properties and possible submillimeter excess of 13 nearby spiral galaxies from the ngls |
we present stratospheric observatory for infrared astronomy (sofia) + atacama large millimeter/submillimeter array (alma) continuum and spectral-line polarization data on the massive molecular cloud byf 73, revealing important details about the magnetic field morphology, gas structures, and energetics in this unusual m... | sofia and alma investigate magnetic fields and gas structures in massive star formation: the case of the masquerading monster in byf 73 |
we report near-infrared polarization of the zodiacal light (zl) measured from space by the diffuse infrared background experiment (dirbe) on board the cosmic background explorer in photometric bands centered at 1.25, 2.2, and 3.5 μm. to constrain the physical properties of interplanetary dust, we use dirbe weekly sky m... | near-infrared polarization charateristics of the zodiacal light observed with dirbe/cobe |
in the past few years, chinese astronomical community is actively testing astronomical sites for several new optical/infrared ground-based telescopes. these site testing campaigns conducted were mainly focused on fundamental performances of the sites, such as cloud coverage, seeing, temperature, etc. with increasing in... | numerical study of a 20w class qcw pulsed sodium guide star laser's performances at five sites in china |
we present a statistical algorithm for predicting the [cii] emission from herschel and spitzer continuum images using probability density functions (pdfs) between the [cii] emission and continuum emission. the [cii] emission at 158μm is a critical tracer in studying the life cycle of interstellar medium and galaxy evol... | statistical prediction of [cii] observations by constructing probability density functions using sofia, herschel, and spitzer observations |
we present multiwavelength spectral and temporal variability analysis of pks 0027-426 using optical griz observations from dark energy survey between 2013 and 2018 and veils optical light curves of extragalactic transient events (voilette) between 2018 and 2019 and near-infrared (nir) jks observations from visible and ... | multiwavelength optical and nir variability analysis of the blazar pks 0027-426 |
in near-infrared bands, co-adding and tiling of astronomical imaging datasets require a sufficiently high calibration quality (flat fielding, background subtraction). here we present a complete workflow for obtaining imaging mosaics with the mmt and magellan infrared spectrograph (mmirs) operated at the 6.5-m mmt in ar... | observing, calibrating and reducing near-infrared imaging mosaics |
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