Publications (20)
The VSOP 5 GHz AGN Survey: III. Imaging Results for the First 102 Sources
W. K. Scott, E. B. Fomalont, S. Horiuchi +17
The VSOP mission is a Japanese-led project to study radio sources with sub-milliarcsec resolution using an orbiting 8 m telescope, HALCA, along with global arrays of Earth-based te…
Multiwavelength interferometric observations and modeling of circumstellar disks
A. A. Schegerer, T. Ratzka, P. A. Schuller +3
We investigate the structure of the innermost region of three circumstellar disks around pre-main sequence stars HD 142666, AS 205 N, and AS 205 S. We determine the inner radii of…
First AU-scale observations of V1647 Ori with VLTI/MIDI
P. Abraham, L. Mosoni, Th. Henning +4
The young eruptive star V1647 Ori was observed with MIDI, the mid-infrared interferometric instrument at the Very Large Telescope Interferometer (VLTI), on March 2, 2005. We presen…
Mid-infrared circumstellar emission of the long-period Cepheid l Carinae resolved with VLTI/MATISSE
V. Hocdé, N. Nardetto, A. Matter +149
The nature of circumstellar envelopes (CSE) around Cepheids is still a matter of debate. The physical origin of their infrared (IR) excess could be either a shell of ionized gas, o…
Mid-infrared interferometric variability of DG Tau: implications for the inner-disk structure
J. Varga, K. Ã. Gabányi, P. Ãbrahám +12
Context. DG Tau is a low-mass pre-main sequence star, whose strongly accreting protoplanetary disk exhibits a so-far enigmatic behavior: its mid-infrared thermal emission is strong…
Fundamental Vibrational Transition of CO during the Outburst of EX Lupi in 2008
M. Goto, Zs. Regály, C. P. Dullemond +16
We report monitoring observations of the T Tauri star EX Lupi during its outburst in 2008 in the CO fundamental band at 4.6-5.0 um. The observations were carried out at the VLT and…
The extended atmosphere and circumstellar environment of the cool evolved star VX Sagittarii as seen by MATISSE
A. Chiavassa, K. Kravchenko, M. Montargès +50
Context. VX Sgr is a cool, evolved, and luminous red star whose stellar parameters are difficult to determine, which affects its classification. Aims. We aim to spatially resolve t…
Deep Extragalactic VLBI-Optical Survey (DEVOS): I. Pilot MERLIN and VLBI observations
L. Mosoni, S. Frey, L. I. Gurvits +3
We present the results of the pilot observations of the Deep Extragalactic VLBI-Optical Survey (DEVOS). Our ultimate aim is to collect information on compact structures in a large…
The asymmetric inner disk of the Herbig Ae star HD 163296 in the eyes of VLTI/MATISSE: evidence for a vortex?
J. Varga, M. Hogerheijde, R. van Boekel +133
Context. The inner few au region of planet-forming disks is a complex environment. High angular resolution observations have a key role in understanding the disk structure and the…
Probing the temporal and spatial variations of dust emission in the protoplanetary disk of DG Tau with VLTI/MIDI - Preliminary results
K. E. Gabanyi, L. Mosoni, A. Juhasz +5
The signatures of dust processing and grain growth - related to the formation of rocky planets - are easily seen in mid-infrared spectral features. One important diagnostic tool in…
Episodic formation of cometary material in the outburst of a solar-like young star
P. Ãbrahám, A. Juhász, C. P. Dullemond +8
Our Solar System originated in interstellar gas and dust; the latter is in the form of amorphous silicate particles and carbonaceous dust. The composition of cometary material show…
MATISSE, the VLTI mid-infrared imaging spectro-interferometer
B. Lopez, S. Lagarde, R. G. Petrov +150
Context:Optical interferometry is at a key development stage. ESO's VLTI has established a stable, robust infrastructure for long-baseline interferometry for general astronomical o…
Radio structure of the most distant radio-detected quasar at the ten milli- arcsecond scale
S. Frey, L. Mosoni, Z. Paragi +1
We present a high resolution radio image of SDSS 0836+0054 identified recently as the most distant radio-detected quasar at a redshift of z=5.82. The observation was carried out wi…
Interferometric Observations of the Hierarchical Triple System Algol
Sz. Csizmadia, T. Borkovits, Zs. Paragi +10
Algol is a triple stellar system consisting of a close semidetached binary orbited by a third object. Due to the disputed spatial orientation of the close pair, the third body pert…
The highest redshift radio quasar as seen with the EVN and the VLA
S. Frey, Z. Paragi, L. Mosoni +1
We report on European VLBI Network (EVN) and Very Large Array (VLA) observations of SDSS J0836+0054, the most distant radio-loud quasar known at present z=5.774). The source, with…
The VSOP 5 GHz Active Galactic Nucleus Survey: V. Imaging Results for the Remaining 140 sources
R. Dodson, E. B. Fomalont, K. Wiik +21
In February 1997, the Japanese radio astronomy satellite HALCA was launched to provide the space-bourne element for the VLBI Space Observatory Programme (VSOP) mission. Approximate…
VLTI/MIDI atlas of disks around low- and intermediate-mass young stellar objects
J. Varga, P. Ãbrahám, L. Chen +13
Context. Protoplanetary disks show large diversity regarding their morphology and dust composition. With mid-infrared interferometry the thermal emission of disks can be spatially…
Deep Extragalactic VLBI-Optical Survey (DEVOS) II. Efficient VLBI detection of SDSS quasars
S. Frey, L. I. Gurvits, Z. Paragi +3
Context: The Deep Extragalactic VLBI-Optical Survey (DEVOS) aims at constructing a large sample of compact radio sources up to two orders of magnitude fainter than those studied in…
High-resolution radio imaging of the most distant radio quasar SDSS J0836+0054
S. Frey, Z. Paragi, L. Mosoni +1
We observed SDSS J0836+0054, the most distant radio-loud quasar known at present (z=5.774) with the European Very Long Baseline Interferometry (VLBI) Network at the 5 GHz frequency…
Dynamics during outburst: VLTI observations of the young eruptive star V1647 Ori during its 2003-2006 outburst
L. Mosoni, N. Sipos, P. Abraham +11
Context: It is hypothesized that low-mass young stellar objects undergo eruptive phases during their early evolution. The outburst of V1647 Ori between 2003 and 2006 offered a rare…