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Journal articles on the topic 'Near Infrared long-Baseline interferometry'

Author: Grafiati

Published: 19 October 2024

Last updated: 31 July 2025

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1

Pan, Xiaopei, Shri Kulkarni, Michael Shao, and M. Mark Colavita. "Narrow-Angle and Wide-Angle Astrometry via Long Baseline Optical/Infrared Interferometers." Symposium - International Astronomical Union 166 (1995): 13–18. http://dx.doi.org/10.1017/s0074180900227769.

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Long baseline optical/infrared interferometers, such as the Mark III Stellar Interferometer1 on Mt. Wilson and the ASEPS-0 Testbed Interferometer2 on Palomar Mountain, California, have good capabilities for narrow-angle and wide-angle astrometry with very high precision. Using the Mark III Interferometer many spectroscopic binaries became “visual” for the first time. The measurement accuracy of angular separation is 0.2 mas, the smallest separation measured between two components is 2 mas, the maximum magnitude difference is 4 mag, and the smallest semimajor axis is 4 mas. Such high angular re

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Jankov, S. "Astronomical optical interferometry, II: Astrophysical results." Serbian Astronomical Journal, no. 183 (2011): 1–35. http://dx.doi.org/10.2298/saj1183001j.

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Optical interferometry is entering a new age with several ground- based long-baseline observatories now making observations of unprecedented spatial resolution. Based on a great leap forward in the quality and quantity of interferometric data, the astrophysical applications are not limited anymore to classical subjects, such as determination of fundamental properties of stars; namely, their effective temperatures, radii, luminosities and masses, but the present rapid development in this field allowed to move to a situation where optical interferometry is a general tool in studies of many astro

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Wittkowski, Markus. "Round Table Summary: Stellar Interferometry as a Tool to Investigate Atmospheres and to Compare Observations with Models." Symposium - International Astronomical Union 210 (2003): 313–21. http://dx.doi.org/10.1017/s0074180900133455.

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Long-baseline interferometry at optical and near-infrared wavelengths is an emerging technology which is quickly becoming a useful tool to investigate stellar atmospheres and to compare observations with models. Stellar atmosphere models have so far mainly been constrained by comparisons with stellar spectra which are integrated over the stellar disks. Interferometric observations provide spatially and spectrally resolved information and can thus provide important complementary observational information which can be compared to model predictions. Here, I summarize the different aspects on this

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Kraus, S., Th Preibisch, and K. Ohnaka. "The inner gaseous accretion disk around a Herbig Be star revealed by near- and mid-infrared spectro-interferometry." Proceedings of the International Astronomical Union 3, S243 (2007): 337–44. http://dx.doi.org/10.1017/s1743921307009696.

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AbstractHerbig Ae/Be stars are pre-main-sequence stars of intermediate mass, which are still accreting material from their environment, probably via a disk composed of gas and dust. Here we present a recent study of the geometry of the inner (AU-scale) circumstellar region around the Herbig Be star MWC 147 using long-baseline interferometry. By combining for the first time near- and mid-infrared spectro-interferometry on a Herbig star, our VLTI/AMBER and VLTI/MIDI data constrain not only the geometry of the brightness distribution, but also the radial temperature distribution in the disk. The

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Dexter, J. "Event horizon scale emission models for Sagittarius A*." Proceedings of the International Astronomical Union 9, S303 (2013): 298–302. http://dx.doi.org/10.1017/s1743921314000775.

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AbstractVery long baseline interferometry observations at millimeter wavelengths have detected source structure in Sgr A* on event horizon scales. Near-infrared interferometry will achieve similar resolution in the next few years. These experiments provide an unprecedented opportunity to explore strong gravity around black holes, but interpreting the data requires physical modeling. I discuss the calculation of images, spectra, and light curves from relativistic MHD simulations of black hole accretion. The models provide an excellent description of current observations, and predict that we may

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Cruzalèbes, P., R. G. Petrov, S. Robbe-Dubois, et al. "A catalogue of stellar diameters and fluxes for mid-infrared interferometry★." Monthly Notices of the Royal Astronomical Society 490, no. 3 (2019): 3158–76. http://dx.doi.org/10.1093/mnras/stz2803.

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Abstract We present the Mid-infrared stellar Diameters and Fluxes compilation Catalogue (MDFC) dedicated to long-baseline interferometry at mid-infrared wavelengths (3–13 $\mu$m). It gathers data for half a million stars, i.e. nearly all the stars of the Hipparcos-Tycho catalogue whose spectral type is reported in the SIMBAD data base. We cross-match 26 data bases to provide basic information, binarity elements, angular diameter, magnitude and flux in the near and mid-infrared, as well as flags that allow us to identify the potential calibrators. The catalogue covers the entire sky with 465 85

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Petersen, Eric, and Charles Gammie. "Non-thermal models for infrared flares from Sgr A*." Monthly Notices of the Royal Astronomical Society 494, no. 4 (2020): 5923–35. http://dx.doi.org/10.1093/mnras/staa826.

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ABSTRACT Recent observations with mm very long baseline interferometry (mm-VLBI) and near-infrared (NIR) interferometry provide mm images and NIR centroid proper motion for Sgr A*. Of particular interest are the NIR flares that have more than an order of magnitude higher flux density than the quiescent state. Here, we model the flares using time-dependent, axisymmetric, general relativistic magnetohydrodynamic (GRMHD) simulations with an electron distribution function that includes a small, variable, non-thermal component motivated by magnetic reconnection models. The models simultaneously mat

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Wittkowski, Markus, David A. Boboltz, Malcolm D. Gray, Elizabeth M. L. Humphreys, Iva Karovicova, and Michael Scholz. "Radio and IR interferometry of SiO maser stars." Proceedings of the International Astronomical Union 8, S287 (2012): 209–16. http://dx.doi.org/10.1017/s1743921312006989.

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AbstractRadio and infrared interferometry of SiO maser stars provide complementary information on the atmosphere and circumstellar environment at comparable spatial resolution. Here, we present the latest results on the atmospheric structure and the dust condensation region of AGB stars based on our recent infrared spectro-interferometric observations, which represent the environment of SiO masers. We discuss, as an example, new results from simultaneous VLTI and VLBA observations of the Mira variable AGB star R Cnc, including VLTI near- and mid-infrared interferometry, as well as VLBA observa

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Christou, J. C. "Speckle Interferometry." Highlights of Astronomy 8 (1989): 561–62. http://dx.doi.org/10.1017/s1539299600008340.

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Speckle interferometry is a technique which utilizes the full diffraction-limited imaging potential of ground-based telescopes. Short exposure images, or specklegrams, with an exposure time less than that of the atmospheric correlation time (~5- 50 ms) preserve the high-spatial frequency information lost in long exposure imaging. In 1970, Labeyrie computed the power spectrum of a set of specklegrams and showed that they contained diffraction-limited information. Since then the field has grown with improvements in both instrumentation and the phase recovery algorithms necessary for imaging. It

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Choquet, É., J. Menu, G. Perrin, F. Cassaing, S. Lacour, and F. Eisenhauer. "Comparison of fringe-tracking algorithms for single-mode near-infrared long-baseline interferometers." Astronomy & Astrophysics 569 (September 2014): A2. http://dx.doi.org/10.1051/0004-6361/201220223.

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Abuter, R., M. Accardo, A. Amorim, et al. "First light for GRAVITY: Phase referencing optical interferometry for the Very Large Telescope Interferometer." Astronomy & Astrophysics 602 (June 2017): A94. http://dx.doi.org/10.1051/0004-6361/201730838.

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GRAVITY is a new instrument to coherently combine the light of the European Southern Observatory Very Large Telescope Interferometer to form a telescope with an equivalent 130 m diameter angular resolution and a collecting area of 200 m2. The instrument comprises fiber fed integrated optics beam combination, high resolution spectroscopy, built-in beam analysis and control, near-infrared wavefront sensing, phase-tracking, dual-beam operation, and laser metrology. GRAVITY opens up to optical/infrared interferometry the techniques of phase referenced imaging and narrow angle astrometry, in many a

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Townes, C. H., M. Bester, W. C. Danchi, C. G. Degiacomi, and L. J. Greenhill. "Heterodyne Interferometry in the Infrared." Symposium - International Astronomical Union 158 (1994): 19–25. http://dx.doi.org/10.1017/s0074180900107284.

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The University of California Infrared Spatial Interferometer (ISI) for the 10 μm wavelength region is briefly described along with results obtained on prominent stars and on atmospheric phenomena. The system has two movable telescopes of 1.65 m aperture. It operates in principle like a modern radio interferometer, using heterodyne detection, CO2 laser local oscillators, RF delay lines, and lobe rotation to maintain a fixed-frequency fringe rate.Rather extensive measurements have been made on atmospheric pathlength or phase fluctuation characteristics which show substantial deviations from the

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Mérand, A., P. Bordé, and V. Coudé du Foresto. "A catalog of bright calibrator stars for 200-m baseline near-infrared stellar interferometry." Astronomy & Astrophysics 433, no. 3 (2005): 1155–62. http://dx.doi.org/10.1051/0004-6361:20041323.

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Mérand, A., P. Bordé, and V. Coudé du Foresto. "A catalog of bright calibrator stars for 200-m baseline near-infrared stellar interferometry." Astronomy & Astrophysics 447, no. 2 (2006): 783. http://dx.doi.org/10.1051/0004-6361:20041323e.

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Gies, Douglas R., Yamina N. Touhami, and Gail H. Schaefer. "Infrared continuum sizes of Be star disks." Proceedings of the International Astronomical Union 6, S272 (2010): 390–91. http://dx.doi.org/10.1017/s1743921311010866.

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AbstractLong baseline interferometry now offers us the opportunity to measure the dimensions of Be star circumstellar disks across the spectrum. This includes the near-infrared continuum where the emission is dominated by bound-free and free-free emission from the ionized disk gas. Here we present the results of calculations of the disk sizes and continuum flux excesses for a simple version of the viscous decretion model of the disk. We compare these results to recent 18 μm flux measurements from the AKARI infrared satellite all-sky survey.

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Kervella, Pierre, Alexandre Gallenne, and Antoine Mérand. "Circumstellar envelopes of Cepheids: a possible bias affecting the distance scale?" Proceedings of the International Astronomical Union 8, S289 (2012): 157–60. http://dx.doi.org/10.1017/s1743921312021291.

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AbstractCircumstellar envelopes (CSEs) have been detected around many Cepheids, first based on long-baseline interferometry, and now also using other observing techniques. These envelopes are particularly interesting for two reasons: their presence could impact the Cepheid distance scale, and they may be valuable tracers of stellar mass loss. Here we focus on their potential impact on the calibration of the Cepheid distance scale. We consider the photometric contribution of the envelopes in the visible, near-, and thermal-infrared domains. We conclude that the impact of CSEs on the apparent lu

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Groh, Jose H. "Effects of fast rotation on the wind of Luminous Blue Variables." Proceedings of the International Astronomical Union 6, S272 (2010): 56–61. http://dx.doi.org/10.1017/s1743921311009975.

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AbstractWhile theoretical studies have long suggested a fast-rotating nature of Luminous Blue Variables (LBVs), observational confirmation of fast rotation was not detected until recently. Here I discuss the diagnostics that have allowed us to constrain the rotational velocity of LBVs: broadening of spectral lines and latitude-dependent variations of the wind density structure. While rotational broadening can be directly detected using high-resolution spectroscopy, long-baseline near-infrared interferometry is needed to directly measure the shape of the latitude-dependent photosphere that form

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18

Millan‐Gabet, R. "Investigation of Herbig Ae/Be Stars in the Near‐Infrared with a Long‐Baseline Interferometer." Publications of the Astronomical Society of the Pacific 112, no. 771 (2000): 742–43. http://dx.doi.org/10.1086/316572.

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Koresko, C. D., G. T. van Belle, A. F. Boden, et al. "The Visual Orbit of the 0[farcs]002 RS CV[CLC]n[/CLC] Binary Star TZ Triangulifrom Near-Infrared Long-Baseline Interferometry." Astrophysical Journal 509, no. 1 (1998): L45—L48. http://dx.doi.org/10.1086/311759.

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Malkin, Zinovy. "Improving Source Positions in the OCARS Catalog: A First Approach." Astronomical Journal 170, no. 1 (2025): 48. https://doi.org/10.3847/1538-3881/addc65.

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Abstract Optical Characteristics of Astrometric Radio Sources (OCARS) is a compiled catalog of various additional data associated with astrometric radio sources whose coordinates have been determined from very long baseline interferometry observations. It contains source coordinates, object type, redshift, optical, and near-infrared magnitudes. Until now, OCARS source coordinates were simply copied from input catalogs and, as a result, were systematically inhomogeneous. This work is the first attempt to obtain a unified set of radio source coordinates aligned to the International Celestial Ref

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Kammerer, Jens, Rachel A. Cooper, Thomas Vandal, et al. "The Near Infrared Imager and Slitless Spectrograph for JWST. V. Kernel Phase Imaging and Data Analysis." Publications of the Astronomical Society of the Pacific 135, no. 1043 (2023): 014502. http://dx.doi.org/10.1088/1538-3873/ac9a74.

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Abstract Kernel phase imaging (KPI) enables the direct detection of substellar companions and circumstellar dust close to and below the classical (Rayleigh) diffraction limit. The high-Strehl full pupil images provided by the James Webb Space Telescope (JWST) are ideal for application of the KPI technique. We present a kernel phase analysis of JWST NIRISS full pupil images taken during the instrument commissioning and compare the performance to closely related NIRISS aperture masking interferometry (AMI) observations. For this purpose, we develop and make publicly available the custom Kpi3Pipe

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Serabyn, E., B. Mennesson, S. Martin, K. Liewer, and J. Kühn. "Nulling at short wavelengths: theoretical performance constraints and a demonstration of faint companion detection inside the diffraction limit with a rotating-baseline interferometer." Monthly Notices of the Royal Astronomical Society 489, no. 1 (2019): 1291–303. http://dx.doi.org/10.1093/mnras/stz2163.

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ABSTRACT The Palomar Fiber Nuller (PFN) is a rotating-baseline nulling interferometer that enables high-accuracy near-infrared (NIR) nulling observations with full azimuth coverage. To achieve NIR null-depth accuracies of several x 10−4, the PFN uses a common-mode optical system to provide a high degree of symmetry, single-mode-fibre beam combination to reduce sensitivity to pointing and wavefront errors, extreme adaptive optics to stabilize the fibre coupling and the cross-aperture fringe phase, rapid signal calibration and camera readout to minimize temporal effects, and a statistical null-d

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Dexter, J., A. Jiménez-Rosales, S. M. Ressler, et al. "A parameter survey of Sgr A* radiative models from GRMHD simulations with self-consistent electron heating." Monthly Notices of the Royal Astronomical Society 494, no. 3 (2020): 4168–86. http://dx.doi.org/10.1093/mnras/staa922.

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ABSTRACT The Galactic centre black hole candidate Sgr A* is the best target for studies of low-luminosity accretion physics, including with near-infrared (NIR) and submillimetre wavelength long baseline interferometry experiments. Here, we compare images and spectra generated from a parameter survey of general relativistic MHD simulations to a set of radio to NIR observations of Sgr A*. Our models span the limits of weak and strong magnetization and use a range of sub-grid prescriptions for electron heating. We find two classes of scenarios can explain the broad shape of the submillimetre spec

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Sezestre, É., J. C. Augereau, and P. Thébault. "Hot exozodiacal dust: an exocometary origin?" Astronomy & Astrophysics 626 (May 30, 2019): A2. http://dx.doi.org/10.1051/0004-6361/201935250.

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Context. Near- and mid-infrared interferometric observations have revealed populations of hot and warm dust grains populating the inner regions of extrasolar planetary systems. These are known as exozodiacal dust clouds, or exozodis, reflecting the similarity with the solar system’s zodiacal cloud. Radiative transfer models have constrained the dust to be dominated by tiny submicron-sized, carbon-rich grains that are accumulated very close to the sublimation radius. The origin of this dust is an unsolved issue. Aims. We explore two exozodiacal dust production mechanisms, first re-investigating

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Kool, E. C., T. M. Reynolds, S. Mattila, et al. "AT 2017gbl: a dust obscured TDE candidate in a luminous infrared galaxy." Monthly Notices of the Royal Astronomical Society 498, no. 2 (2020): 2167–95. http://dx.doi.org/10.1093/mnras/staa2351.

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ABSTRACT We present the discovery with Keck of the extremely infrared (IR) luminous transient AT 2017gbl, coincident with the Northern nucleus of the luminous infrared galaxy (LIRG) IRAS 23436+5257. Our extensive multiwavelength follow-up spans ∼900 d, including photometry and spectroscopy in the optical and IR, and (very long baseline interferometry) radio and X-ray observations. Radiative transfer modelling of the host galaxy spectral energy distribution and long-term pre-outburst variability in the mid-IR indicate the presence of a hitherto undetected dust obscured active galactic nucleus (

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Hone, Edward, Stefan Kraus, Claire L. Davies, et al. "Compact gaseous accretion disk in Keplerian rotation around MWC 147." Astronomy & Astrophysics 623 (February 28, 2019): A38. http://dx.doi.org/10.1051/0004-6361/201834626.

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Context. The disks around some Herbig Be stars have been observed to be more compact than the expected dust sublimation radius for such objects. Highly refractory dust grains and optically thick gas emission have been proposed as possible explanations for this phenomenon. Aims. Previously, the “undersized” Herbig Be star MWC 147 was observed with interferometry, and the results indicated a presence of a compact gaseous disk based on the measured wavelength-dependence of near-infrared or mid-infrared visibilities. Our aim is to search for direct evidence for the presence of hot gas inside of th

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Sanchez-Bermudez, J., A. Alberdi, R. Schödel, et al. "A VLBI study of the wind-wind collision region in the massive multiple HD 167971." Astronomy & Astrophysics 624 (April 2019): A55. http://dx.doi.org/10.1051/0004-6361/201834659.

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Context. Colliding winds in massive binaries are able to accelerate particles up to relativistic speeds as the result of the interaction between the winds of the different stellar components. HD 167971 exhibits this phenomenon which makes it a strong radio source. Aims. We aim at characterizing the morphology of the radio emission and its dependence on the orbital motion, traced independently by near-infrared (NIR) interferometry of both the spectroscopic binary and the tertiary component comprising HD 167971. Methods. We analyze 2006 and 2016 very long baseline interferometric data at C and X

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Bhattacharya, Rajorshi, Brandon M. Medina, Ylva M. Pihlström, et al. "Distance Estimate Method for Asymptotic Giant Branch Stars Using Infrared Spectral Energy Distributions." Astrophysical Journal 969, no. 2 (2024): 109. http://dx.doi.org/10.3847/1538-4357/ad463e.

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Abstract We present a method to estimate distances to asymptotic giant branch (AGB) stars in the Galaxy, using spectral energy distributions (SEDs) in the near- and mid-infrared. By assuming that a given set of source properties (initial mass, stellar temperature, composition, and evolutionary stage) will provide a typical SED shape and brightness, sources are color matched to a distance-calibrated template and thereafter scaled to extract the distance. The method is tested by comparing the distances obtained to those estimated from very long baseline interferometry or Gaia parallax measuremen

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Jiang, Ning, Di Luo, Jiazheng Zhu, and Roc M. Cutri. "The Extraordinary Long-lasting Infrared Echo of PS16dtm Reveals an Extremely Energetic Nuclear Outburst." Astrophysical Journal Letters 980, no. 1 (2025): L17. https://doi.org/10.3847/2041-8213/adaeb9.

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Abstract PS16dtm is one of the earliest reported tidal disruption events (TDEs) in active galactic nuclei and displays a remarkably bright and long-lived infrared (IR) echo revealed by multiepoch photometry from the Wide-field Infrared Survey Explorer (WISE). After a rapid rise in the first year, the echo remains persistently at a high state from 2017 July to 2024 July, the latest epoch, and keeps an almost constant color. We have fitted the extraordinary IR emission with a refined dust echo model by taking into account the dust sublimation process. The fitting suggests that an extremely giant

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Torres, Guillermo, Andrew F. Boden, John D. Monnier, and Gerard T. van Belle. "Absolute Dimensions of the Interferometric Binary HD 174881: A Test of Stellar Evolution Models for Evolved Stars." Astrophysical Journal 977, no. 1 (2024): 43. https://doi.org/10.3847/1538-4357/ad8dcc.

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Abstract We report high-resolution spectroscopic monitoring and long-baseline interferometric observations with the Palomar Testbed Interferometer (PTI) of the 215 day binary system HD 174881 (K1 II-III), composed of two giant stars. The system is spatially resolved with the PTI, as well as in archival measurements with the CHARA Array. Our analysis of these observations, along with an analysis of the spectral energy distribution, have allowed us to infer accurate values for the absolute masses ( 3.367 − 0.041 + 0.045 and 3.476 − 0.043 + 0.043 M ☉ ), radii (34.0 ± 1.3 and 22.7 ± 1.8 R ☉), effe

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Chrenko, Ondřej, Mario Flock, Takahiro Ueda, Antoine Mérand, Myriam Benisty, and Raúl O. Chametla. "The Inner Disk Rim of HD 163296: Linking Radiative Hydrostatic Models with Infrared Interferometry." Astronomical Journal 167, no. 3 (2024): 124. http://dx.doi.org/10.3847/1538-3881/ad234d.

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Abstract Previous studies of the protoplanetary disk HD 163296 revealed that the morphology of its sub-au infrared emission encompasses the terminal sublimation front of dust grains, referred to as the inner rim, but also extends into the (supposedly) dust-free region within it. Here, we present a set of radiative hydrostatic simulations of the inner rim in order to assess how much the rim alone can contribute to the observed interferometric visibilities V, half-light radii R hl, and fractional disk fluxes F in the wavelength range 1.5–13 μm. In our set of models, we regulate the cooling effic

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Hofmann, K. H., T. Blöcker, G. Weigelt, and Y. Balega. "A Multi-Wavelength Study of the Oxygen-Rich AGB Star CIT 3: Bispectrum speckle interferometry and dust-shell modelling." Symposium - International Astronomical Union 209 (2003): 121. http://dx.doi.org/10.1017/s0074180900208267.

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CIT 3 is an oxygen-rich long-period variable evolving along the Asymptotic Giant Branch and is one of the most extreme infrared AGB objects. Due to substantial mass loss it is surrounded by an optically thick dust shell which absorbs almost all visible light radiated by the star and finally re-emits it in the infrared regime. We present the first near infrared bispectrum speckle-interferometry observations of CIT 3 in the J-, H-, and K′-band (resolution: 48 mas, 56 mas, and 73 mas). The interferograms were obtained with the Russian SAO 6 m telescope. While CIT 3 appears almost spherically symm

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Margutti, Raffaella, and Ryan Chornock. "First Multimessenger Observations of a Neutron Star Merger." Annual Review of Astronomy and Astrophysics 59, no. 1 (2021): 155–202. http://dx.doi.org/10.1146/annurev-astro-112420-030742.

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We describe the first observations of the same celestial object with gravitational waves and light. ▪ GW170817 was the first detection of a neutron star merger with gravitational waves. ▪ The detection of a spatially coincident weak burst of gamma-rays (GRB 170817A) 1.7 s after the merger constituted the first electromagnetic detection of a gravitational wave source and established a connection between at least some cosmic short gamma-ray bursts (SGRBs) and binary neutron star mergers. ▪ A fast-evolving optical and near-infrared transient (AT 2017gfo) associated with the event can be interpret

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MichałowskI, Michał J., Dong Xu, Jamie Stevens, et al. "The second-closest gamma-ray burst: sub-luminous GRB 111005A with no supernova in a super-solar metallicity environment." Astronomy & Astrophysics 616 (August 2018): A169. http://dx.doi.org/10.1051/0004-6361/201629942.

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We report the detection of the radio afterglow of a long gamma-ray burst (GRB) 111005A at 5-345 GHz, including very long baseline interferometry observations with a positional error of 0.2 mas. The afterglow position is coincident with the disc of a galaxy ESO 58049 at z = 0.01326 (∼1″ from its centre), which makes GRB 111005A the second-closest GRB known to date, after GRB 980425. The radio afterglow of GRB 111005A was an order of magnitude less luminous than those of local low-luminosity GRBs, and obviously less luminous than those of cosmological GRBs. The radio flux was approximately const

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Sfarra, Stefano, Clemente Ibarra-Castanedo, Carlo Santulli, Domenica Paoletti, and Xavier Maldague. "Monitoring of jute/hemp fiber hybrid laminates by nondestructive testing techniques." Science and Engineering of Composite Materials 23, no. 3 (2016): 283–300. http://dx.doi.org/10.1515/secm-2013-0138.

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AbstractDamage following static indentation of jute/hemp (50 wt.% total fiber content) hybrid laminates was detected by a number of nondestructive testing (NDT) techniques, in particular, near (NIR) and short-wave (SWIR) infrared reflectography and transmittography, infrared thermography (IRT), digital speckle photography (DSP), and holographic interferometry (HI), to discover and evaluate real defects in a laminate with a complex structure. A comparative study between thermographic data acquired in the mid- (MWIR) and long-wave infrared (LWIR) spectrum bands, by pulsed (PT) and square pulse (

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Andrei, Bylinkin, and Hillenbrand Rainer. "Real-space observation of vibrational strong coupling between propagating phonon polaritons and organic molecules." Nature Photonics 15, March 2021 (2023): 197–202. https://doi.org/10.1038/s41566-020-00725-3.

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Phonon polaritons (PPs) in van der Waals (vdW) materials can strongly enhance light-matter interactions at mid-infrared frequencies, owing to their extreme infrared field confinement and long lifetimes. PPs thus bear potential for achieving vibrational strong coupling (VSC) with molecules. Although the onset of VSC has recently been observed spectroscopically with PP nanoresonators, no experiments so far have resolved VSC in real space and with propagating modes in unstructured layers. Here, we demonstrate by real-space nanoimaging that VSC can be achieved between propagating PPs in

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Koutoulaki, M., R. Garcia Lopez, A. Natta, et al. "The circumstellar environment of HD 50138 revealed by VLTI/AMBER at high angular resolution." Astronomy & Astrophysics 614 (June 2018): A90. http://dx.doi.org/10.1051/0004-6361/201832814.

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Context. HD 50138 is a Herbig B[e] star with a circumstellar disc detected at infrared and millimeter wavelength. Its brightness makes it a good candidate for near-infrared interferometry observations. Aims. We aim to resolve, spatially and spectrally, the continuum and hydrogen emission lines in the 2.12–2.47 micron region, to shed light on the immediate circumstellar environment of the star. Methods. VLTI/AMBER K-band observations provide spectra, visibilities, differential phases, and closure phases along three long baselines for the continuum, and H I emission in Brγ and five high-n Pfund

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Swain, Subhashree, Vaidehi S. Paliya, D. J. Saikia, and C. S. Stalin. "DA 362: A Gamma-Ray-emitting Compact Symmetric Object." Astrophysical Journal 979, no. 2 (2025): 97. https://doi.org/10.3847/1538-4357/ada1d7.

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Abstract The γ-ray detection from an astrophysical object indicates the presence of an extreme environment where high-energy radiation is produced. With the continuous monitoring of the γ-ray sky by the Fermi Large Area Telescope (LAT) leading to deeper sensitivity, high-energy γ-ray emission has now been detected from a diverse class of jetted active galactic nuclei (AGNs). Here, we present the results of a multiwavelength study of the radio source DA 362, which was reported to be a blazar candidate of uncertain type. However, it was recently identified as a bona fide compact symmetric object

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Eupen, F., L. Labadie, R. Grellmann, et al. "The GRAVITY young stellar object survey." Astronomy & Astrophysics 648 (April 2021): A37. http://dx.doi.org/10.1051/0004-6361/202039599.

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Context. Close young binary stars are unique laboratories for the direct measurement of pre-main-sequence (PMS) stellar masses and their comparison to evolutionary theoretical models. At the same time, a precise knowledge of their orbital parameters when still in the PMS phase offers an excellent opportunity for understanding the influence of dynamical effects on the morphology and lifetime of the circumstellar as well as circumbinary material. Aims. The young T Tauri star WW Cha was recently proposed to be a close binary object with strong infrared and submillimeter excess associated with cir

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Goddi, C., H. Falcke, M. Kramer, et al. "BlackHoleCam: Fundamental physics of the galactic center." International Journal of Modern Physics D 26, no. 02 (2017): 1730001. http://dx.doi.org/10.1142/s0218271817300014.

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Einstein’s General theory of relativity (GR) successfully describes gravity. Although GR has been accurately tested in weak gravitational fields, it remains largely untested in the general strong field cases. One of the most fundamental predictions of GR is the existence of black holes (BHs). After the recent direct detection of gravitational waves by LIGO, there is now near conclusive evidence for the existence of stellar-mass BHs. In spite of this exciting discovery, there is not yet direct evidence of the existence of BHs using astronomical observations in the electromagnetic spectrum. Are

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Danchi, W. C., M. Bester, P. R. McCullough, and C. H. Townes. "Infrared Long Baseline Interferometry." Highlights of Astronomy 8 (1989): 563–64. http://dx.doi.org/10.1017/s1539299600008352.

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During the last few years, two new instruments using long baseline interferometry have been constructed for high angular resolution astronomy in the mid-infrared spectral region (8-12 μxm). One called SOIRDETE-Synthese d’Overture en InfraRouge a DEux TElescopes-was built by J. Gay and his collaborators at CERGA. SOIRDETE has a fixed E-W 15 m baseline and two 1 m diameter telescopes of conventional design. This instrument obtains interference fringes by adjusting an optical-precision delay line in discrete steps to compensate for the geometrical delay of the projected baseline. The interference

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Dharmawardena, T. E., C. A. L. Bailer-Jones, M. Fouesneau, and D. Foreman-Mackey. "Three-dimensional dust density structure of the Orion, Cygnus X, Taurus, and Perseus star-forming regions." Astronomy & Astrophysics 658 (February 2022): A166. http://dx.doi.org/10.1051/0004-6361/202141298.

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Interstellar dust affects many astronomical observations through absorption and reddening, yet this extinction is also a powerful tool for studying interstellar matter in galaxies. Three-dimensional (3D) reconstructions of dust extinction and density in the Milky Way have suffered from artefacts such as the fingers-of-god effect and negative densities, and have been limited by large computational costs. Here, we aim to overcome these issues with a novel algorithm that derives the 3D extinction density of dust in the Milky Way using a latent variable Gaussian process in combination with variati

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Ridgway, S. T. "Long Baseline Optical Interferometry." Highlights of Astronomy 8 (1989): 559–60. http://dx.doi.org/10.1017/s1539299600008339.

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During the last three years significant results have been obtained from several operational, long baseline optical interferometers. Precision stellar angular diameters (accuracy of order 2% and better) have been reported in the infrared (DiBenedetto and Rabbia, 1987) and in the visible (Davis and Tango, 1986). Astrometric precision of order 20 milliarcsec has been demonstrated over large angles (Shao et al, in press). Spectro-spatial resolution of the disk of a Be star in the hydrogen emission line (Thom et al., 1986) suggests spectacular imaging science to come with many-telescope coherent an

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Labdon, Aaron, Stefan Kraus, Claire L. Davies, et al. "Dusty disk winds at the sublimation rim of the highly inclined, low mass young stellar object SU Aurigae." Astronomy & Astrophysics 627 (June 27, 2019): A36. http://dx.doi.org/10.1051/0004-6361/201935331.

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Context. T Tauri stars are low-mass young stars whose disks provide the setting for planet formation. Despite this, their structure is poorly understood. We present new infrared interferometric observations of the SU Aurigae circumstellar environment that offer resolution that is three times higher and a better baseline position angle coverage than previous observations. Aims. We aim to investigate the characteristics of the circumstellar material around SU Aur, constrain the disk geometry, composition and inner dust rim structure. Methods. The CHARA array offers unique opportunities for long

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Kervella, P., D. Bersier, D. Mourard, N. Nardetto, and V. Coudé du Foresto. "Cepheid distances from infrared long-baseline interferometry." Astronomy & Astrophysics 423, no. 1 (2004): 327–33. http://dx.doi.org/10.1051/0004-6361:20035596.

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Kervella, P., D. Bersier, D. Mourard, N. Nardetto, P. Fouqué, and V. Coudé du Foresto. "Cepheid distances from infrared long-baseline interferometry." Astronomy & Astrophysics 428, no. 2 (2004): 587–93. http://dx.doi.org/10.1051/0004-6361:20041416.

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Shao, M., and M. M. Colavita. "Long-Baseline Optical and Infrared Stellar Interferometry." Annual Review of Astronomy and Astrophysics 30, no. 1 (1992): 457–98. http://dx.doi.org/10.1146/annurev.aa.30.090192.002325.

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Kervella, P., N. Nardetto, D. Bersier, D. Mourard, and V. Coudé du Foresto. "Cepheid distances from infrared long-baseline interferometry." Astronomy & Astrophysics 416, no. 3 (2004): 941–53. http://dx.doi.org/10.1051/0004-6361:20031743.

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Davelaar, Jordy, Hector Olivares, Oliver Porth, et al. "Modeling non-thermal emission from the jet-launching region of M 87 with adaptive mesh refinement." Astronomy & Astrophysics 632 (November 21, 2019): A2. http://dx.doi.org/10.1051/0004-6361/201936150.

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Context. The galaxy M 87 harbors a kiloparsec-scale relativistic jet, whose origin coincides with a compact source thought to be a supermassive black hole. Observational millimeter very long baseline interferometry campaigns are capable of resolving the jet-launching region at the scale of the event horizon. In order to provide a context for interpreting these observations, realistic general-relativistic magnetohydrodynamical (GRMHD) models of the accretion flow are constructed. Aims. Electrons in the jet are responsible for the observed synchrotron radiation, which is emitted in frequencies r

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Pfuhl, O., R. Davies, J. Dexter, et al. "An image of the dust sublimation region in the nucleus of NGC 1068." Astronomy & Astrophysics 634 (January 28, 2020): A1. http://dx.doi.org/10.1051/0004-6361/201936255.

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We present near-infrared interferometric data on the Seyfert 2 galaxy NGC 1068, obtained with the GRAVITY instrument on the European Southern Observatory Very Large Telescope Interferometer. The extensive baseline coverage from 5 to 60 Mλ allowed us to reconstruct a continuum image of the nucleus with an unrivaled 0.2 pc resolution in the K-band. We find a thin ring-like structure of emission with a radius r = 0.24 ± 0.03 pc, inclination i = 70 ± 5°, position angle PA = −50 ± 4°, and h/r < 0.14, which we associate with the dust sublimation region. The observed morphology is inconsistent wit

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