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C2D Spitzer-IRS spectra of disks around T Tauri stars. II. PAH emission features
Aims. We search for Polycyclic Aromatic Hydrocarbon (PAH) features towards young low-mass (T Tauri) stars and compare them with surveys of intermediate mass (Herbig Ae/Be) stars. The presence andExpand
Cold disks: Spitzer spectroscopy of disks around young stars with large gaps
We have identified four circumstellar disks with a deficit of dust emission from their inner 15-50 AU. All four stars have F-G spectral type and were uncovered as part of the Spitzer Space TelescopeExpand
Collisional processes and size distribution in spatially extended debris discs
Context. New generations of instruments provide, or are about to provide, pan-chromatic images of debris discs and photometric measurements, that require new generations of models, in particular toExpand
Hst/nicmos2 coronagraphic observations of the circumstellar environment of three old pms stars: hd 100546, sao 206462 and mwc 480
The close environment of four old Pre-Main Sequence stars has been observed thanks to the coronagraphic mode of the HST/NICMOS2 camera at $\lambda=1.6 \mu$m. In the course of this program, a cir cumExpand
Circumstellar material in the Vega inner system revealed by CHARA/FLUOR
Context. Only a handful of debris disks have been imaged up to now. Due to the need for high dynamic range and high angular resolution, very little is known about the inner planetary region, whereExpand
Probing dust grain evolution in IM Lupi's circumstellar disc. Multi-wavelength observations and mo
Aims. We present a panchromatic study, involving a multiple technique approach, of the circumstellar disc surrounding the T Tauri star IM Lupi (Sz 82). Methods. We have undertaken a comprehensiveExpand
Discovery of an 86 AU Radius Debris Ring around HD 181327
HST NICMOS PSF-subtractedcoronagraphicobservationsof HD181327haverevealedthepresenceofaringlike disk of circumstellar debris seen in 1.1 � m light scattered by the disk grains, surrounded by aExpand
Dust production from collisions in extrasolar planetary systems. The inner beta Pictoris disc
Dust particles observed in extrasolar planetary discs originate from undetectable km-sized bodies but this valuable information remains uninteresting if the theoretical link between grains andExpand
Dynamical modeling of large scale asymmetries in the beta Pictoris dust disk
We report a new and complete model of the Pictoris disk, which succeeds in accounting for both the surface brightness distribution, warp characteristics, the outer \butterfly" asymmetry as observedExpand
Molecular Gas Clumps from the Destruction of Icy Bodies in the β Pictoris Debris Disk
A highly asymmetric disk of dust and carbon monoxide orbiting the planet-hosting star, β Pictoris, delineates a region of enhanced collisions, either from a mean motion resonance with an unseen giant planet or from the remnants of a collision of Mars-mass planets. Expand