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Phase Referencing in Optical Interferometry
Mercedes E. Filho, Paulo Garcia, Gilles Duvert +20
One of the aims of next generation optical interferometric instrumentation is to be able to make use of information contained in the visibility phase to construct high dynamic rang…
System overview of the VLTI Spectro-Imager
L. Jocou, J. P. Berger, F. Malbet +30
The VLTI Spectro Imager project aims to perform imaging with a temporal resolution of 1 night and with a maximum angular resolution of 1 milliarcsecond, making best use of the Very…
VSI: the VLTI spectro-imager
F. Malbet, D. Buscher, G. Weigelt +51
The VLTI Spectro Imager (VSI) was proposed as a second-generation instrument of the Very Large Telescope Interferometer providing the ESO community with spectrally-resolved, near-i…
Milli-arcsecond astrophysics with VSI, the VLTI spectro-imager in the ELT era
F. Malbet, D. Buscher, G. Weigelt +49
Nowadays, compact sources like surfaces of nearby stars, circumstellar environments of stars from early stages to the most evolved ones and surroundings of active galactic nuclei c…
Discovery of an extended debris disk around the F2V star HD 15745
Paul Kalas, Gaspard Duchene, Michael P. Fitzgerald +1
Using the Advanced Camera for Surveys aboard the Hubble Space Telescope, we have discovered dust-scattered light from the debris disk surrounding the F2V star HD 15745. The circums…
Multiple protostellar systems. II. A high resolution near-infrared imaging survey in nearby star-forming regions
G. Duchêne, S. Bontemps, J. Bouvier +3
(abridged) Our project endeavors to obtain a robust view of multiplicity among embedded Class I and Flat Spectrum protostars in a wide array of nearby molecular clouds to disentang…
The AU Microscopii Debris Disk: Multiwavelength Imaging and Modeling
Michael P. Fitzgerald, Paul G. Kalas, Gaspard Duchene +2
(abridged) Debris disks around main sequence stars are produced by the erosion and evaporation of unseen parent bodies. AU Microscopii (GJ 803) is a compelling object to study in t…
Binary Stars in the Orion Nebula Cluster
Rainer Koehler, Monika G. Petr-Gotzens, Mark J. McCaughrean +4
We report on a high-spatial-resolution survey for binary stars in the periphery of the Orion Nebula Cluster, at 5 - 15 arcmin (0.65 - 2 pc) from the cluster center. We observed 228…
Monte Carlo radiative transfer in protoplanetary disks
Christophe Pinte, Francois Menard, Gaspard Duchene +1
We present a new continuum 3D radiative transfer code, MCFOST, based on a Monte-Carlo method. MCFOST can be used to calculate (i) monochromatic images in scattered light and/or the…
Radiative transfer in protoplanetary disks
Christophe Pinte, Francois Menard, Gaspard Duchene
We present a new 3D continuum radiative transfer code, MCFOST, based on a Monte-Carlo method. The reliability and efficiency of the code is tested by comparison with five different…
Discovery of an Optically Thick, Edge-on Disk around the Herbig Ae star PDS 144N
Marshall D. Perrin, Gaspard Duchene, Paul Kalas +1
We have discovered an optically thick, edge-on circumstellar disk around a Herbig Ae star in the binary system PDS 144, providing the first intermediate-mass analog of HK Tau and s…
New observational frontiers in the multiplicity of young stars
G. Duchene, E. Delgado-Donate, K. Haisch +2
It has now been known for over a decade that low-mass stars located in star-forming regions are very frequently members of binary and multiple systems, even more so than main seque…
Multiple protostellar systems. I. A deep near infrared survey of Taurus and Ophiuchus protostellar objects
G. Duchene, J. Bouvier, S. Bontemps +2
(Abridged) We performed a deep infrared imaging survey of 63 embedded young stellar objects (YSOs) located in the Taurus and Ophiuchus clouds to search for companions. The sample i…
On the alignment of classical T Tauri stars with the magnetic field in the Taurus-Auriga molecular cloud
Francois Menard, Gaspard Duchene
In this paper we readdress the issue of the alignment of Classical T Tauri stars with the magnetic field in the Taurus-Auriga molecular cloud. Previous studies have claimed that th…
On the alignment of T Tauri stars with the local magnetic field
G. Duchene, F. Menard
Magnetic field is believed to play an important role in the collapse of a molecular cloud. In particular, due to the properties of magnetic forces, collapse should be easier along…
Stellar Orbits Around the Galactic Center Black Hole
A. M. Ghez, S. Salim, S. D. Hornstein +5
We present new proper motion measurements and simultaneous orbital solutions for three newly identified (S0-16, S0-19, and S0-20) and four previously known (S0-1, S0-2, S0-4, and S…
Non coeval young multiple systems? On the pairing of protostars and T Tauri stars
Gaspard Duchene, Andrea Ghez, Caer McCabe
We summarize here the observed properties of ``infrared companions'' to T Tauri stars and argue that their observational properties are identical to those of Class I sources. They…
The First Detection of Spatially Resolved Mid-Infrared Scattered Light from a Protoplanetary Disk
C. McCabe, G. Duchene, A. M. Ghez
We report spatially resolved 11.8 micron images, obtained at the W. M. Keck 10 m telescope, of the protoplanetary disk around the pre--main-sequence star HK Tau B. The mid-infrared…
No Fossil Disk in the T Tauri Multiple System V773 Tau
G. Duchene, A. M. Ghez, C. McCabe +1
We present new multi-epoch near-infrared and optical high-angular images of the V773 Tau pre-main sequence triple system, a weak-line T Tauri (WTTS) system in which the presence of…
Full Three Dimensional Orbits For Multiple Stars on Close Approaches to the Central Supermassive Black Hole
A. M. Ghez, E. Becklin, G. Duchene +4
With the advent of adaptive optics on the W. M. Keck 10 m telescope, two significant steps forward have been taken in building the case for a supermassive black hole at the center…
The First Measurement of Spectral Lines in a Short-Period Star Bound to the Galaxy's Central Black Hole: A Paradox of Youth
A. M. Ghez, G. Duchene, K. Matthews +11
We have obtained the first detection of spectral absorption lines in one of the high-velocity stars in the vicinity of the Galaxy's central supermassive black hole. Both Brgamma (2…
A layered edge-on circumstellar disk around HK Tau B
G. Duchene, F. Menard, K. Stapelfeldt +1
We present the first high angular resolution 1.4mm and 2.7mm continuum maps of the T Tauri binary system HK Tau obtained with the Plateau de Bure Interferometer. The contributions…
Near-infrared imaging polarimetry of the GG Tau circumbinary ring
Joel Silber, Tim Gledhill, Gaspard Duchene +1
We present 1 micron Hubble Space Telescope/NICMOS resolved imaging polarimetry of the GG Tau circumbinary ring. We find that the ring displays east-west asymmetries in surface brig…
Circumbinary disks around T Tauri stars: HST/NICMOS near-infrared images and polarimetric maps
G. Duchene, J. Silber, F. Menard +1
We have obtained new near-infrared images of both GG Tau and UY Aur circumbinary disks with the polarimetric modes of NICMOS aboard the Hubble Space Telescope. The 1 micron intensi…