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the wide field infrared survey telescope-astrophysics focused telescope asset (wfirst-afta) mission is a 2.4-m class space telescope that will be used across a swath of astrophysical research domains. jpl will provide a high-contrast imaging coronagraph instrument-one of two major astronomical instruments. in order to ... | technology advancement of the ccd201-20 emccd for the wfirst coronagraph instrument: sensor characterization and radiation damage |
episodic mass loss is not understood theoretically, neither accounted for in state-of-the-art models of stellar evolution, which has far-reaching consequences for many areas of astronomy. we introduce the erc-funded assess project (2018-2024), which aims to determine whether episodic mass loss is a dominant process in ... | introducing the assess project: episodic mass loss in evolved massive stars -- key to understanding the explosive early universe |
the galactic center contains some of the most extreme conditions for star formation in our galaxy, as well as many other phenomena that are unique to this region. given our relative proximity to the galactic center, we are able to study details of physical processes to a level that is simply not yet possible for more d... | sofia/forcast galactic center legacy survey: overview |
intensity mapping (im) of multiple emission lines is emerging as a new branch to astronomy, to probe both properties of ionizing sources and the medium between, in particular the intergalactic medium. for epoch of reionization (eor) studies, both multiline experiments and analysis methods are still in their infancy. he... | optimal survey parameters: ly α and h α intensity mapping for synergy with the 21-cm signal during reionization |
we present an analysis of all currently available ground-based imaging of neptune in the mid-infrared. dating between 2003 and 2020, the images reveal changes in neptune's mid-infrared (~8-25 μm) emission over time in the years surrounding neptune's 2005 southern summer solstice. images sensitive to stratospheric ethan... | subseasonal variation in neptune's mid-infrared emission |
accurate tracers of the stellar magnetic field and rotation are cornerstones for the study of m dwarfs and for reliable detection and characterization of their exoplanetary companions. such measurements are particularly challenging for old, slowly rotating, fully convective m dwarfs. to explore the use of new activity ... | rotational modulation of spectroscopic zeeman signatures in low-mass stars |
we present a technique to identify spectrophotometrically variable l7-t3 brown dwarfs with single-epoch, low-resolution, near-infrared spex spectra. we calculated spectral indices on known variable brown dwarfs and used them to select 11 index-index parameter spaces where known variables can be distinguished from the r... | disentangling the signatures of blended-light atmospheres in l/t transition brown dwarfs |
we present atacama large millimeter/submillimeter array (alma) [c ii] 158 μm and dust continuum observations of the z = 6.79 quasar j0109-3047 at a resolution of 0.″045 (~300 pc). the dust and [c ii] emission are enclosed within a ~500 pc radius, with the central beam (r < 144 pc) accounting for ~25% (8%) of the tot... | alma 300 pc resolution imaging of a z = 6.79 quasar: no evidence for supermassive black hole influence on the c ii kinematics |
the first goal of this work is to improve the determination of the energy difference (δecis-trans) between the ground vibrational state of the cis- and trans-hono conformers of nitrous acid. for this, high resolution spectra were recorded in the 50-200 cm-1 spectral region at three different temperatures, 240, 270 and ... | new line intensities for the far infrared bands of the trans- and cis-conformer of nitrous acid (hono), new determination of the trans-cis conformer barrier and its impact on the astrophysical detection of nitrous acid in protostellar clouds |
molecular absorption of infrared radiation is generally due to rovibrational electric-dipole transitions. electric-quadrupole transitions may still occur, but they are typically a million times weaker than electric-dipole transitions, rendering their observation extremely challenging. in polyatomic or polar diatomic mo... | observation of electric-quadrupole infrared transitions in water vapor |
the current debate about the nature of the carbonaceous material carrying the infrared (ir) emission spectra of planetary and proto-planetary nebulae, including the broad plateaus, calls for further studies on the interplay between structure and spectroscopy of carbon-based compounds of astrophysical interest. the rece... | mapping the structural diversity of c60 carbon clusters and their infrared spectra |
aims: ω centauri (ngc 5139) contains many variable stars of different types and, in particular, more than one hundred rr lyrae stars. this enabled gathering a homogeneous sample (in terms of instrument, image quality, and time coverage) of high-quality near-infrared (nir) rr lyrae light curves by performing an extensiv... | updated census of rr lyrae stars in the globular cluster ω centauri (ngc 5139) |
we present planetcam upv/ehu, an astronomical camera designed fundamentally for high-resolution imaging of solar system planets using the “lucky imaging” technique. the camera observes in a wavelength range from 380 nm to 1.7 μm and the driving science themes are atmosphere dynamics and vertical cloud structure of sola... | planetcam upv/ehu: a two-channel lucky imaging camera for solar system studies in the spectral range 0.38-1.7 μm |
hd 106906b is an $\sim 11{m}_{\mathrm{jup}}, ∼15 myr old directly imaged exoplanet orbiting at an extremely large distance from its host star. the wide separation (7"11) between hd 106906b and its host star greatly reduces the difficulty in direct-imaging observations, making it one of the most favorable directly image... | cloud atlas: high-precision hst/wfc3/ir time-resolved observations of directly imaged exoplanet hd 106906b |
to address the the problem of calibration of instrument systematics in transit light curves, we present the python package exotic-ism. transit spectroscopy can reveal many different chemical components in exoplanet atmospheres, but such results depend on well-calibrated transit light curve observations. each transit da... | exotic-ism: a python package for marginalised exoplanet transit parameters across a grid of systematic instrument models |
proper motion studies of stars in the centre of the milky way have typically been limited to the arches and quintuplet clusters, and to the central parsec. here we present the first results of a large-scale proper motion study of stars within several tens of parsecs of sagittarius a* based on our 0.2″ angular resolutio... | first results from a large-scale proper motion study of the galactic centre |
4great is an extension of the german receiver for astronomy at terahertz frequencies (great) operated aboard the stratospheric observatory for infrared astronomy (sofia). the spectrometer comprises four different detector bands and their associated subsystems for simultaneous and fully independent science operation. al... | 4great—a four-color receiver for high-resolution airborne terahertz spectroscopy |
thousands of exoplanets have been discovered; however, the detection of exomoons remains elusive. tidally heated exomoons have been proposed as candidate targets for observation; vigorous tidal dissipation can raise the moon's surface temperature, making direct imaging possible, and cause widespread volcanism that can ... | tidally heated exomoons around gas giants |
we present mid-infrared spectroscopy of jupiter's mid-to-high latitudes using the gemini-north/texas echelon cross echelle spectrograph on 2017 march 17-19. these observations capture jupiter's hydrocarbon auroral emissions before, during, and after the arrival of a solar wind compression on march 18, which highlights ... | a high spatial and spectral resolution study of jupiter's mid-infrared auroral emissions and their response to a solar wind compression |
bolometers based on graphene have demonstrated outstanding performance with high sensitivity and short response time. in situ adjustment of bolometers is very important in various applications, but it is still difficult to implement in many systems. here we propose a gate-tunable bolometer based on two strongly coupled... | gate-tunable bolometer based on strongly coupled graphene mechanical resonators |
motivated by tension between the predictions of ordinary cold dark matter (cdm) and observations at galactic scales, ultralight axionlike particles (ulalps) with mass of the order 10-22 ev have been proposed as an alternative cdm candidate. we consider cold and collisionless ulalps produced in the early universe by the... | new astrophysical bounds on ultralight axionlike particles |
we present far-infrared (fir) properties of an extremely luminous infrared galaxy (elirg) at zspec = 3.703, wise j101326.25+611220.1 (wise 1013+6112). this elirg is selected as an ir-bright dust-obscured galaxy based on the photometry from the sloan digital sky survey and the wide-field infrared survey explorer (wise).... | sofia/hawc+ view of an extremely luminous infrared galaxy: wise 1013+6112 |
we present a search for companion [c ii] emitters to known luminous sources at 6 < z < 6.5 in deep, archival alma observations. the observations are deep enough to detect sources with ${l}_{[{\rm{c}}{\rm{ii}}]}\sim {10}^{8}\ {l}_{\odot }$ at z ∼ 6. we identify three new robust line detections from a blind search ... | investigating overdensities around z > 6 galaxies through alma observations of [c ii] |
presented are the first interferometric images of cool starspots on the chromospherically active giant λ andromedae. using the michigan infra-red combiner coupled to the center for high angular resolution astronomy array, 26 interferometric observations were made between 2008 august 17 and 2011 september 24. the photom... | interferometric imaging of λ andromedae: evidence of starspots and rotation |
we present 31.5 μm imaging photometry of 11 nearby seyfert galaxies observed from the stratospheric observatory for infrared astronomy (sofia) using the faint object infrared camera for the sofia telescope (forcast). we tentatively detect extended 31 μm emission for the first time in our sample. in combination with thi... | investigating the dusty torus of seyfert galaxies using sofia/forcast photometry |
star formation in galaxies is regulated by heating and cooling in the interstellar medium (ism). in particular, the processing of molecular gas into stars will depend strongly on the ratio of gas heating to gas cooling in the neutral gas around sites of recent star formation. in this work, we combine mid-infrared (mid-... | regulating star formation in nearby dusty galaxies: low photoelectric efficiencies in the most compact systems |
although ultraluminous x-ray sources (ulx) are important for astrophysics because of their extreme apparent super-eddington luminosities, their nature is still poorly known. theoretical and observational studies suggest that ulxs could be a diversified group of objects that are composed of low-mass x-ray binaries, high... | wind-powered ultraluminous x-ray sources |
the presence of neutral c60 fullerenes in circumstellar environments has been firmly established by astronomical observations as well as laboratory experiments and quantum-chemistry calculations. however, the large variations observed in the c60 17.4 μm/18.9 μm band ratios indicate that either additional emitters shoul... | on the presence of metallofullerenes in fullerene-rich circumstellar envelopes |
weak gravitational lensing is a powerful tool for studying the growth of structure across cosmic time. the shear signal required for weak lensing analyses is very small, so any undesirable detector-level effects which distort astronomical images can significantly contaminate the inferred shear. the nancy grace roman sp... | quantum yield and charge diffusion in the nancy grace roman space telescope infrared detectors |
we design and train a neural network (nn) model to efficiently predict the infrared spectra of interstellar polycyclic aromatic hydrocarbons with a computational cost many orders of magnitude lower than what a first-principles calculation would demand. the input to the nn is based on the morgan fingerprints extracted f... | machine-learning prediction of infrared spectra of interstellar polycyclic aromatic hydrocarbons |
the echelon-cross-echelle spectrograph (exes) is a high spectral resolution, mid-infrared spectrograph designed for and operated on the stratospheric observatory for infrared astronomy (sofia). exes has multiple operational modes, but is optimized for high spectral resolution. the heart of the instrument is a one meter... | exes: the echelon-cross-echelle spectrograph for sofia |
polycyclic aromatic hydrocarbon (pah) emission in the spitzer/irs spectral map of the northwest photon dominated region (pdr) in ngc 7023 is analyzed. here, results from fitting the 5.2-14.5 μm spectrum at each pixel using exclusively pah spectra from the nasa ames pah ir spectroscopic database (www.astrochem.org/pahdb... | properties of polycyclic aromatic hydrocarbons in the northwest photon dominated region of ngc 7023. iii. quantifying the traditional proxy for pah charge and assessing its role |
context. in dense clouds, hydrogenation reactions on icy dust grains are key in the formation of molecules, like formaldehyde, methanol, and complex organic molecules (coms). these species form through the sequential hydrogenation of co ice. although molecular hydrogen (h2) abundances can be four orders of magnitude hi... | h2 chemistry in interstellar ices: the case of co ice hydrogenation in uv irradiated co:h2 ice mixtures |
emission bands from polycyclic aromatic hydrocarbons (pahs) dominate the mid-infrared spectra of a wide variety of astronomical sources, encompassing nearly all stages of stellar evolution. despite their similarities, details in band positions and shapes have allowed a classification of pah emission to be developed. it... | effect of molecular structure on the infrared signatures of astronomically relevant pahs |
we have performed a high-resolution 4-13 μm spectral survey of the hot molecular gas associated with the massive protostars afgl 2591 and afgl 2136, utilizing the echelon cross echelle spectrograph (exes) on board the stratospheric observatory for infrared astronomy, and the ishell instrument and texas echeloncross ech... | high-resolution infrared spectroscopy of hot molecular gas in afgl 2591 and afgl 2136: accretion in the inner regions of disks around massive young stellar objects |
context. planetary systems hold the imprint of the formation and of the evolution of planets especially at young ages, and in particular at the stage when the gas has dissipated leaving mostly secondary dust grains. the dynamical perturbation of planets in the dust distribution can be revealed with high-contrast imagin... | two cold belts in the debris disk around the g-type star nz lupi |
we present insights into the behavior of the astronomical 7.7 μm polycyclic aromatic hydrocarbon (pah) emission complex as gleaned from analyzing synthesized spectra, utilizing the data and tools from the nasa ames pah ir spectroscopic database. we specifically study the influence of pah size, charge, aliphatic content... | examining the class b to a shift of the 7.7 μm pah band with the nasa ames pah ir spectroscopic database |
the origins space telescope (origins) is one of four science and technology definition studies selected by national aeronautics and space administration (nasa) in preparation of the 2020 astronomy and astrophysics decadal survey in the us. origins will trace the history of our origins from the time dust and heavy eleme... | origins space telescope: from first light to life -- esa voyage 2050 white paper |
phosphine is now well established as a biosignature, which has risen to prominence with its recent tentative detection on venus. to follow up this discovery and related future exoplanet biosignature detections, it is important to spectroscopically detect the presence of phosphorus-bearing atmospheric molecules that cou... | computational infrared spectroscopy of 956 phosphorus-bearing molecules |
the thermal inertia of an asteroid is an indicator of the thermophysical properties of the regolith and is determined by the size of grains on the surface. previous thermophysical modeling studies of asteroids have identified or suggested that object size, rotation period, and heliocentric distance (a proxy for tempera... | thermophysical investigation of asteroid surfaces. i. characterization of thermal inertia |
context. the james webb space telescope (jwst) will deliver an unprecedented quantity of high-quality spectral data over the 0.6-28 μm range. it will combine sensitivity, spectral resolution, and spatial resolution. specific tools are required to provide efficient scientific analysis of such large data sets.aims: our a... | learning mid-ir emission spectra of polycyclic aromatic hydrocarbon populations from observations |
polycyclic aromatic hydrocarbon (pah) molecules are widely considered the preferred candidate for the carrier of the unidentified infrared emission bands observed in the interstellar medium and circumstellar envelopes. in this paper, we report the results of fitting a variety of non-pah spectra (silicates, hydrogenated... | on the viability of the pah model as an explanation of the unidentified infrared emission features |
we are undertaking the first systematic infrared (ir) census of r coronae borealis (rcb) stars in the milky way, beginning with ir light curves from the palomar gattini ir (pgir) survey. the pgir is a 30 cm j-band telescope with a 25 deg2 camera that is surveying 18,000 deg2 of the northern sky (δ > -28°) at a caden... | census of r coronae borealis stars. i. infrared light curves from palomar gattini ir |
water ice has a strong spectral feature at a wavelength of approximately 3 μm, which plays a vital role in our understanding of the icy universe. in this study, we investigate the scattering polarization of this water-ice feature. the linear polarization degree of light scattered by micron-sized icy grains is known to ... | scattering polarization of 3 μm water-ice feature by large icy grains |
context. methanimine, ch2nh, and ethanimine, ch3chnh, were both detected in the interstellar medium (ism), the former in the 1970s and the latter nearly a decade ago. by analogy with nitriles, for which hydrogen cyanide, acetonitrile, and ethyl cyanide are the most abundant, n-propanimine was suggested as a candidate f... | submillimeter wave spectroscopy and astronomical search for 1-propanimine |
context. the stratospheric observatory for infrared astronomy (sofia) with its 2.5 m telescope provides new science opportunities for spectroscopic observations of planetary atmospheres in the far-infrared wavelength range.aims: this paper presents first results from the 14 may, 2014 observing campaign of the martian a... | first detection of the 63 μm atomic oxygen line in the thermosphere of mars with great/sofia |
near-infrared (nir) spectrometers on board current sample return missions hayabusa2 and the origins-spectral interpretation-resource identification-security-regolith explorer (osiris-rex) from primitive bodies detected the presence of hydrated silicates on the surface of asteroids ryugu and bennu, respectively. these d... | space weathering affects the remote near-ir identification of phyllosilicates |
the first gas-phase infrared spectra of two isolated astronomically relevant and large polycyclic aromatic hydrocarbon (pah) cations—diindenoperylene (dip) and dicoronylene (dc)—in the 530-1800 cm-1 (18.9-5.6 μm) range—are presented. vibrational band positions are determined for comparison to the aromatic infrared band... | laboratory gas-phase infrared spectra of two astronomically relevant pah cations: diindenoperylene, {{\\rm{c}}}_{32}{{\\rm{h}}}_{16}^{+} and dicoronylene, {{\\rm{c}}}_{48}{{\\rm{h}}}_{20}^{+} |
the current paradigm of galactic center (gc) gas motions and star formation envisions sequential star formation in streams of gas as they pass near the supermassive black hole sgr a*. this is based on the relative positions of dense molecular clouds, the very young star-forming region sgr b2, the much older region sgr ... | sofia fifi-ls observations of sgr b1: ionization structure and sources of excitation |
we present and publicly release a set of deep, full-sky wide-field infrared survey explorer (wise) coadds built from wise and neowise images spanning from early 2010 through late 2018. this data release uniformly incorporates six years of wise and neowise exposures at 3.4 μm (w1) and 4.6 μm (w2). these inertial "unwise... | six-year static sky unwise coadds |
context. mwc158 is a star with the b[e] phenomenon that shows strong spectrophotometric variability (in lines and in uv and visible continuum) attributed to phases of shell ejection. the evolutionary stage of this star was never clearly determined. previous interferometric, spectropolarimetric and spectro-interferometr... | a disk asymmetry in motion around the b[e] star mwc158 |
aims: the globular cluster ω centauri (ngc 5139) hosts hundreds of pulsating variable stars of different types, thus representing a treasure trove for studies of their corresponding period-luminosity (pl) relations. our goal in this study is to obtain the pl relations for rr lyrae and sx phoenicis stars in the field of... | near-ir period-luminosity relations for pulsating stars in ω centauri (ngc 5139) |
we use jwst nircam observations of the massive lensing cluster field a2744 to develop a red galaxy selection of f f444w > 1 μjy and f f444w/f f150w > 3.5 that picks out all nine >4.5σ atacama large millimeter/submillimeter array 1.1 or 1.2 mm sources and 17 of the 19 >5σ scuba-2 850 μm sources in the covere... | mapping the decline with redshift of dusty star-forming galaxies using jwst and scuba-2 |
we present near-infrared k-band spectra for a sample of seven class 0 protostars in the perseus and orion star-forming regions. we detect brγ, co overtone, and h2 emission, features that probe the near-circumstellar environment of the protostar and reveal evidence of magnetospheric accretion, a hot inner disk atmospher... | the near-stellar environment of class 0 protostars: a first look with near-infrared spectroscopy |
the evolution of a pulsar wind nebula (pwn) depends on properties of the progenitor star, supernova, and surrounding environment. as some of these quantities are difficult to measure, reproducing the observed dynamical properties and spectral energy distribution (sed) with an evolutionary model is often the best approa... | the nonstandard properties of a "standard" pwn: unveiling the mysteries of pwn g21.5-0.9 using its ir and x-ray emission |
context. complex organic molecules (coms) have been largely identified through their characteristic rotational transitions in the gas of interstellar and circumstellar regions. although these species are formed in the icy mantles that cover dust grains, the most complex species that has been unambiguously identified in... | infrared spectra of complex organic molecules in astronomically relevant ice mixtures. ii. acetone |
context. although solid-state pathways are expected to dominate the formation mechanisms of many complex organic molecules (coms), very few coms have been securely identified in interstellar ices, in stark contrast with the many com detections in the gas phase. the launch of the james webb space telescope (jwst) and it... | the hunt for formamide in interstellar ices. a toolkit of laboratory infrared spectra in astronomically relevant ice mixtures and comparisons to iso, spitzer, and jwst observations |
because of their period-luminosity relation (plr), classical cepheids play a key role in the calibration of the extragalactic distance scale and the determination of the hubble-lemaître constant h 0. recent findings show that the majority of classical cepheids should be in binary or multiple systems, which might underm... | synthetic population of binary cepheids. ii. the effect of companion light on the extragalactic distance scale |
recent investigations have demonstrated the potential for utilizing a new observational and data-analysis technique for studying the atmospheres of nontransiting exoplanets with combined light that relies on acquiring simultaneous, broad-wavelength spectra and resolving planetary infrared emission from the stellar spec... | mirecle: science yield for a mid-infrared explorer-class mission to study nontransiting rocky planets orbiting the nearest m stars using planetary infrared excess |
high-contrast imaging in the visible and near-infrared (vis/nir) has revealed the presence of a plethora of substructures in circumstellar disks (csds). one of the most commonly observed substructures are concentric gaps that are often attributed to the presence of embedded forming planets. however, direct detections o... | feasibility of detecting and characterizing embedded low-mass giant planets in gaps in the vis/nir wavelength range |
we present a [c ii] 158 μm map of the entire m51 (including m51b) grand design spiral galaxy observed with the far infrared field-imaging line spectrometer (fifi-ls) instrument on board the stratospheric observatory for infrared astronomy (sofia). we compare the [c ii] emission with the total far-infrared (tir) intensi... | a sofia survey of [c ii] in the galaxy m51. i. [c ii] as a tracer of star formation |
the relationship between dust polarization and extinction was determined for the cold dense starless molecular cloud core fest 1-457 based on the background star polarimetry of dichroic extinction at near-infrared wavelengths. owing to the known (three-dimensional) magnetic field structure, the observed polarizations f... | distortion of magnetic fields in a starless core. iii. polarization-extinction relationship in fest 1-457 |
stellar absorption lines of heavy elements can give us various insights into the chemical evolution of our galaxy and other nearby galaxies. recently developed spectrographs for the near-infrared wavelengths are becoming more and more powerful at producing a large number of high-quality spectra, but identification and ... | identification of absorption lines of heavy metals in the wavelength range 0.97-1.32 μm |
a longstanding problem in astrochemistry is the inability of many current models to account for missing sulfur content. many relatively simple species that may be good candidates to sequester sulfur have not been measured experimentally at the high spectral resolution necessary to enable radioastronomical identificatio... | searches for interstellar hccsh and h2ccs |
globular clusters (gcs) in the milky way represent the ideal laboratory to establish the age of the oldest stellar populations and to measure the color-magnitude relation of stars. infrared (ir) photometry of these objects provides a new opportunity to accomplish this task. in particular, at low stellar masses, the ste... | the age of the old metal-poor globular cluster ngc 6397 using wfc3/ir photometry |
we present a new global study of the millimeter (mm) wave, submillimeter (sub-mm) wave, and terahertz (thz) spectra of the lowest three torsional states of methyl mercaptan (ch3sh). new measurements have been carried out between 50 and 510 ghz using the kharkiv mm wave and the cologne sub-mm wave spectrometers whereas ... | rotational spectroscopy of methyl mercaptan ch332sh at millimeter and submillimeter wavelengths |
we present a novel experimental study on solid ch2doh pure and in astrophysical relevant mixtures. solid samples were accreted under ultra high vacuum conditions at 17 k and were analyzed by mid-infrared transmission spectroscopy. refractive index, density, and mid-ir band strength values were measured for pure solid c... | mid-ir band strength, density, refractive index, and thermal evolution study for solid ch2doh pure and in astrophysical relevant mixtures |
we present low-resolution near-infrared spectra of discoveries from an all-sky proper motion search conducted using multi-epoch data from the wide-field infrared survey explorer. using the data from neowise, along with the allwise catalog, schneider et al. conducted an all-sky proper motion survey to search for nearby ... | spectroscopic follow-up of discoveries from the neowise proper motion survey |
we present results from two herschel observing programs using the photodetector array camera and spectrometer. during three separate campaigns, we obtained herschel data for 24 stars at 70, 100, and 160 μm. we chose stars that were already known or suspected to have circumstellar dust based on excess infrared (ir) emis... | herschel observations of dusty debris disks |
we report observation of isotropic interplanetary dust (ipd) by analyzing the infrared (ir) maps of the diffuse infrared background experiment (dirbe) on board the cosmic background explorer (cobe) spacecraft. to search for the isotropic ipd, we perform new analysis in terms of the solar elongation angle (ɛ), because w... | the isotropic interplanetary dust cloud and near-infrared extragalactic background light observed with cobe/dirbe |
context. a variety of laboratory ice spectra simulating different chemical environments, ice morphologies, and thermal and energetic processing are needed in order to provide an accurate interpretation of the infrared spectra of protostars. to decipher the combination of laboratory data that best fits the observations,... | fitting infrared ice spectra with genetic modelling algorithms. presenting the eniigma fitting tool |
we present a description of the data reduction pipeline for fifi-ls, the mid-infrared integral field spectrograph on board the stratospheric observatory for infrared astronomy (sofia). we discuss the various data reduction steps and algorithms implemented in the pipeline, including ramp fitting, chop-nod subtraction, w... | the data reduction pipeline for fifi-ls, the mir integral field spectrograph for sofia |
in active galactic nuclei (agns), fluorescent fe kα (iron) line emission is generally interpreted as originating from obscuring material around a supermassive black hole on the scale of a few parsecs. however, recent chandra studies indicate the existence of iron line emission extending to kiloparsec scales in the host... | chandra observations of excess fe kα line emission in galaxies with high star formation rates: x-ray reflection on galaxy scales? |
we perform a statistical clustering analysis of upper main-sequence stars in the large magellanic cloud (lmc) using data from the visible and infrared survey telescope for astronomy survey of the magellanic clouds. we map over 2500 young stellar structures at 15 significance levels across ~120 square degrees centred on... | the vmc survey - xlvii. turbulence-controlled hierarchical star formation in the large magellanic cloud |
photoionization modeling of active galactic nuclei (agn) predicts that diffuse continuum (dc) emission from the broad-line region makes a substantial contribution to the total continuum emission from ultraviolet through near-infrared wavelengths. evidence for this dc component is present in the strong balmer jump featu... | the paschen jump as a diagnostic of the diffuse nebular continuum emission in active galactic nuclei |
a recent hydrodynamic model, the radiation-driven fountain model (wada et al. 2016), presented a dynamical picture that active galactic nuclei (agns) tori sustain their geometrical thickness by gas circulation around agns, and previous papers have confirmed that this picture is consistent with multiwavelength observati... | probing dynamics and thermal properties inside molecular tori with co rovibrational absorption lines |
we present a host morphological study of 1266 far-infrared galaxies (firgs) and submillimeter galaxies (smgs) in the cosmic evolution survey field using the f160w and f814w images obtained by the hubble space telescope. the firgs and smgs are selected from the herschel multi-tiered extragalactic survey and the scuba-2 ... | morphological evolution of the hosts of far-infrared/submillimeter galaxies |
context. of the two structural isomers of ch3o, methoxy is the only radical whose astronomical detection has been reported through the observation of several rotational lines at 2 and 3 mm wavelengths. although the hydroxymethyl radical, ch2oh, is known to be thermodynamically the most stable (by ~3300 cm-1), it has so... | laboratory detection of the rotational-tunnelling spectrum of the hydroxymethyl radical, ch2oh |
we describe the faint object infrared camera for the sofia telescope (forcast) which is presently operating as a facility instrument on the stratospheric observatory for infrared astronomy (sofia). forcast provides imaging and moderate resolution spectroscopy capability over the 5-40μm wavelength range. in imaging mode... | forcast: a mid-infrared camera for sofia |
in this study, the detailed magnetic field structure of the dense protostellar core barnard 335 (b335) was revealed, based on near-infrared polarimetric observations of background stars to measure dichroically polarized light produced by magnetically aligned dust grains in the core. magnetic fields pervading b335 were ... | distortion of magnetic fields in barnard 335 |
fourier transform infrared absorption cross-sections of pure propane (c3h8) and propane broadened with h2 have been calculated from transmittance spectra recorded at temperatures from 292 k to 205 k. transmittance spectra were recorded at the canadian light source (cls) far-infrared beamline, utilizing both the synchro... | infrared absorption cross sections of propane broadened by hydrogen |
far-infrared astronomy has advanced rapidly since its inception in the late 1950's, driven by a maturing technology base and an expanding community of researchers. this advancement has shown that observations at far-infrared wavelengths are important in nearly all areas of astrophysics, from the search for habitable pl... | review: far-infrared instrumentation and technology development for the next decade |
context. a low-mass brown dwarf has recently been imaged around hr 2562 (hd 50571), a star hosting a debris disk resolved in the far infrared. interestingly, the companion location is compatible with an orbit coplanar with the disk and interior to the debris belt. this feature makes the system a valuable laboratory to ... | vlt/sphere astrometric confirmation and orbital analysis of the brown dwarf companion hr 2562 b |
the field-imaging far-infrared line spectrometer (fifi-ls) is a science instrument for the stratospheric observatory for infrared astronomy (sofia). fifi-ls allows simultaneous observations in two spectral channels. the “blue” channel is sensitive from 51μm to 125μm and the “red” channel from 115μm to 203μm. the instan... | spectral and spatial characterization and calibration of fifi-ls — the field imaging spectrometer on sofia |
context. in addition to their great astrophysical interest, quasars represent quasi-ideal reference objects in the celestial sphere with, a priori, a lack of significant proper motion. since the fourth release of the large quasar astrometric catalogue (lqac-4), a large number of quasars have been discovered, in particu... | lqac-5: the fifth release of the large quasar astrometric catalogue. a compilation of 592 809 objects with 398 697 gaia counterparts |
we present spectral and photometric imaging receiver (spire) spectroscopy for nine early-type galaxies (etgs) representing the most co-rich and far-infrared (fir) bright galaxies of the volume-limited atlas3d sample. our data include detections of mid- to high-j co transitions (j = 4-3 to j = 13-12) and the [c i] (1-0)... | spire spectroscopy of early-type galaxies |
we present infrared multi-epoch observations of the dust-forming nova v1280 sco over ∼2000 days from the outburst. the temporal evolution of the infrared spectral energy distributions at 1272, 1616, and 1947 days can be explained by the emissions produced by amorphous carbon dust of mass (6.6-8.7) × 10-8 m⊙ with a repr... | concurrent formation of carbon and silicate dust in nova v1280 sco |
by stacking publicly available deep spitzer/mips 24 μm and herschel/pacs images for 213 z≃ 2.18 lyα emitters (laes) in goods-south, we obtain a strong upper limit to the ir luminosity of typical laes and discuss their attenuation curve for the first time. the 3σ upper limit ltir3σ= 1.1× {{10}10} {{l}⊙ }, determined fro... | first infrared-based implications for the dust attenuation and star formation of typical lyα emitters |
accurate measurements of electron density are critical for determination of the plasma properties in the solar corona. we compare the electron densities diagnosed from fe xiii lines observed by the extreme-ultraviolet imaging spectrometer (eis) onboard the hinode mission with the near-infrared (nir) measurements provid... | electron densities in the solar corona measured simultaneously in the extreme ultraviolet and infrared |
we present new 0.3-21 μm photometry of sn 2021aefx in the spiral galaxy ngc 1566 at +357 days after b-band maximum, including the first detection of any type ia supernova (sn ia) at >15 μm. these observations follow earlier jwst observations of sn 2021aefx at +255 days after the time of maximum brightness, allowing ... | serendipitous nebular-phase jwst imaging of sn ia sn 2021aefx: testing the confinement of 56co decay energy |
we describe a new transit-detection algorithm designed to detect single-transit events in discontinuous perkins infrared exosatellite survey (pines) observations of l and t dwarfs. we use this algorithm to search for transits in 131 pines light curves and identify two transit candidates: 2mass j18212815+1414010 (2mass ... | the perkins infrared exosatellite survey (pines). ii. transit candidates and implications for planet occurrence around l and t dwarfs |
the formation and growth of refractory matter on pre-existing interstellar dust grain surfaces was studied experimentally by annealing neon-ice matrices in which potential precursors of silicate grains (mg and fe atoms, sio and sio2 molecules) and of solid carbon (cn molecules, n = 2-10) were initially isolated. other ... | separate silicate and carbonaceous solids formed from mixed atomic and molecular species diffusing in neon ice |
context. eta carinae is a highly eccentric, massive binary system (semimajor axis ~15.5 au) with powerful stellar winds and a phase-dependent wind-wind collision (wwc) zone. the primary star, η car a, is a luminous blue variable (lbv); the secondary, η car b, is a wolf-rayet or o star with a faster but less dense wind.... | vlti-matisse chromatic aperture-synthesis imaging of η carinae's stellar wind across the brα line. periastron passage observations in february 2020 |
in the last two decades infrared spectroscopy has brought mounting evidence, in the form of weak co features together with enhanced 13c, of the presence of cno-processed material in the atmosphere of the donor star of some nonmagnetic cataclysmic variables. some of these donors also exhibit a temperature too high for t... | white dwarf photospheric abundances in cataclysmic variables. iii. five dwarf novae with an evolved secondary donor star |
non-contact temperature measurement for a solar telescope mirror is critical for improving the mirror seeing and thermal deformation of solar telescopes, a long-standing challenge in astronomy. this challenge arises from the telescope mirror's inherent weak thermal radiation, often overwhelmed by reflected background r... | research on accurate non-contact temperature measurement method for telescope mirror |
we describe an "urban observatory" facility designed for the study of complex urban systems via persistent, synoptic, and granular imaging of dynamical processes in cities. an initial deployment of the facility has been demonstrated in new york city and consists of a suite of imaging systems—both broadband and hyperspe... | the urban observatory: a multi-modal imaging platform for the study of dynamics in complex urban systems |
six different calibrations of the polarimetric albedo scale of asteroids have been published so far. each of them contains its particular random and systematic errors and yields its values of geometric albedo. on the one hand, this complicates their analysis and comparison; on the other hand, it becomes more and more d... | generalized calibration of the polarimetric albedo scale of asteroids |
weak gravitational lensing has emerged as a leading probe of the growth of cosmic structure. however, the shear signal is very small and accurate measurement depends critically on our ability to understand how non-ideal instrumental effects affect astronomical images. the wide-field infrared survey telescope (wfirst) w... | brighter-fatter effect in near-infrared detectors—iii. fourier-domain treatment of flat field correlations and application to wfirst |
context. age and mass determinations for isolated stellar objects remain model-dependent. while stellar interior and atmospheric theoretical models are rapidly evolving, we need a powerful tool to test them. open clusters are good candidates for this role.aims: we aim to create a fiducial sequence of stellar objects fo... | single stars in the hyades open cluster. fiducial sequence for testing stellar and atmospheric models |
decades after the beginning of its fu orionis-type outburst, v346 nor unexpectedly underwent a fading event of δk = 4.6 mag around 2010. we obtained near-infrared observations and re-analyzed data from the vista/vvv survey to outline the brightness evolution. in our vlt/naco images, we discovered a halo of scattered li... | brightness variations of the fuor-type eruptive star v346 normae |
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