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Leinert, Christoph; Graser, U.; Przygodda, Frank; Waters, L. B. F. M.; Perrin, G.; Jaffe, W.; López, B.; Bakker, E.; Böhm, A.; Chesneau, O.; Cotton, WD; Damstra, S.; Jong, Johannes de; Glazenborg-Kluting, AW; Grimm, Bernhard; Hanenburg, Hiddo; Laun, W.; Lenzen, R.; Ligori, S.; Mathar, Richard J.; Meisner, Jeff; Morel, S.; Morr, Werner; Neumann, Udo; Pel, J. W.; Schüller, Peter; Rohloff, R. R.; Stecklum, B.; Storz, Clemens; Lühe, O. von der; Wagner, K.

doi:10.1023/a:1026158127732

Cited by 127 publications

(28 citation statements)

References 6 publications

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“…MIDI is a interferometric instrument combining light from two telescopes in the MIR (8-13 μm; Leinert et al 2003). This data set consists of 27 individual observations with baseline lengths ranging from 10 to 90 m (see Table 1).…”

Section: Vlti/midimentioning

confidence: 99%

A Multi-instrument and Multi-wavelength High Angular Resolution Study of MWC 614: Quantum Heated Particles Inside the Disk Cavity*

Kluska

Kraus

Davies

et al. 2018

ApJ

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High angular resolution observations of young stellar objects are required to study the inner astronomical units of protoplanetary disks in which the majority of planets form. As they evolve, gaps open up in the inner disk regions and the disks are fully dispersed within ∼10 Myr. MWC614 is a pretransitional object with a ∼10 au radius gap. We present a set of high angular resolution observations of this object including SPHERE/ZIMPOL polarimetric and coronagraphic images in the visible, Keck/NIRC2 near-infrared (NIR) aperture masking observations, and Very Large Telescope Interferometer (AMBER, MIDI, and PIONIER) and Center for High Angular Resolution Astronomy (CLASSIC and CLIMB) long-baseline interferometry at infrared wavelengths. We find that all the observations are compatible with an inclined disk (i∼55°at a position angle of ∼20°-30°). The mid-infrared data set confirms that the disk inner rim is at 12.3±0.4 au from the central star. We determined an upper mass limit of 0.34 M e for a companion inside the cavity. Within the cavity, the NIR emission, usually associated with the dust sublimation region, is unusually extended (∼10 au, 30 times larger than the theoretical sublimation radius) and indicates a high dust temperature (T∼1800 K). As a possible result of companion-induced dust segregation, quantum heated dust grains could explain the extended NIR emission with this high temperature. Our observations confirm the peculiar state of this object where the inner disk has already been accreted onto the star, exposing small particles inside the cavity to direct stellar radiation.

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Section: Vlti/midimentioning

confidence: 99%

A Multi-instrument and Multi-wavelength High Angular Resolution Study of MWC 614: Quantum Heated Particles Inside the Disk Cavity*

Kluska

Kraus

Davies

et al. 2018

ApJ

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“…The sources were observed in 2007 June with the Very Large Telescope Interferometer (VLTI) MID-infrared Interferometric Instrument (MIDI; Leinert et al 2003;Ratzka et al 2007). The VLTI/MIDI interferometer operates like a classical Michelson interferometer combining the mid-IR light (N band, 7.5-13.5 µm) from two VLT Unit Telescopes (8.2 m).…”

Section: O B S E Rvat I O N Smentioning

confidence: 99%

Very Large Telescope Interferometer observations of the dust geometry around R Coronae Borealis stars★

Bright¹,

Chesneau²,

Clayton³

et al. 2011

Monthly Notices of the Royal Astronomical Society

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We are investigating the formation and evolution of dust around the hydrogen‐deficient supergiants known as R Coronae Borealis (RCB) stars. We aim to determine the connection between the probable merger past of these stars and their current dust‐production activities. We carried out high angular resolution interferometric observations of three RCB stars, namely RY Sgr, V CrA and V854 Cen, with the mid‐infrared interferometer (MIDI) on the Very Large Telescope Interferometer (VLTI), using two telescope pairs. The baselines ranged from 30 to 60 m, allowing us to probe the dusty environment at very small spatial scales (∼50 mas or 400R★). The observations of the RCB star dust environments were interpreted using both geometrical models and one‐dimensional radiative transfer codes. From our analysis, we find that asymmetric circumstellar material is apparent in RY Sgr, may also exist in V CrA and is possible for V854 Cen. Overall, we find that our observations are consistent with dust forming in clumps ejected randomly around the RCB star so that over time they create a spherically symmetric distribution of dust. However, we conclude that the determination of whether there is a preferred plane of dust ejection must wait until a time series of observations are obtained.

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“…The introduction of the MID-infrared Interferometer (MIDI, Leinert et al 2003) to the Very Large Telescope Interferometer (VLTI) has granted the Active Galactic Nuclei (AGN) community access to unprecedented spatial scales. MIDI operated in the N-band which in most galaxies is dominated by emission from warm, 300 − 400K, dust.…”

Section: Introductionmentioning

confidence: 99%

Parsec-scale Dusty Winds in Active Galactic Nuclei: Evidence for Radiation Pressure Driving*

Leftley

Hönig

Asmus

et al. 2019

ApJ

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Infrared interferometry of local AGN has revealed a warm (∼300K-400K) polar dust structure that cannot be trivially explained by the putative dust torus of the unified model. This led to the development of the disk+wind scenario which comprises of a hot (∼1000K) compact equatorial dust disk and a polar dust wind. This wind is assumed to be driven by radiation pressure and, therefore, we would expect that long term variation in radiation pressure would influence the dust distribution. In this paper we attempt to quantify if and how the dust distribution changes with radiation pressure. We analyse so far unpublished VLTI/MIDI data on 8 AGN and use previous results on 25 more to create a sample of 33 AGN. This sample comprises all AGN successfully observed with VLTI/MIDI. For each AGN, we calculate the Eddington ratio, using the intrinsic 2-10 keV X-ray luminosity and black hole mass, and compare this to the resolved dust emission fraction as seen by MIDI. We tentatively conclude that there is more dust in the wind at higher Eddington ratios, at least in type 2 AGN where such an effect is expected to be more easily visible.

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Cited by 127 publications

References 6 publications

A Multi-instrument and Multi-wavelength High Angular Resolution Study of MWC 614: Quantum Heated Particles Inside the Disk Cavity*

A Multi-instrument and Multi-wavelength High Angular Resolution Study of MWC 614: Quantum Heated Particles Inside the Disk Cavity*

Very Large Telescope Interferometer observations of the dust geometry around R Coronae Borealis stars★

Parsec-scale Dusty Winds in Active Galactic Nuclei: Evidence for Radiation Pressure Driving*

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