VLT/NACO coronagraphic observations of fine structures in the disk of beta Pictoris

Abstract

We present ground-based observations of the disk around the A-type star $\beta$ Pictoris to perform a close inspection of the inner disk morphology. Images were collected with NACO, the AO-assisted near-IR instrument on the VLT (ESO) which includes two types of coronagraphs: classical Lyot masks and phase masks. In this program we took advantage of both types of coronagraphs in two spectral bands, H-band for the Lyot mask and Ks-band for the phase mask. In addition, we simulated an extended object to understand the limitations in deconvolution of coronagraphic images. The reduced coronagraphic images allow us to carefully measure the structures of the debris disk and reveal a number of asymmetries of which some were not reported before (position, elevation and thickness of the warp). In this program, the circumstellar material is visible as close as 0.7" ($13.5$AU) owing to the phase mask while the Lyot mask generates artifacts which hamper the detection of the dust at separations closer than 1.2" ($23.2$AU). The point source detection limit is compared to recently published observations of a planet candidate. Finally, the simulations show that deconvolution of coronagraphic data may indeed produce artificial patterns within the image of a disk.

arXiv comment13 pages, to appear in Astronomy and Astrophysics

References in corpus (16)

• Evolutionary models for very-low-mass stars and brown dwarfs with dusty atmospheres
• A planetary system as the origin of structure in Fomalhaut's dust belt
• How Observations of Circumstellar Disk Asymmetries Can Reveal Hidden Planets: Pericenter Glow and its Application to the HR 4796 Disk
• A planet on an inclined orbit as an explanation of the warp in the Beta Pictoris disk
• HST/ACS Multiband Coronagraphic Imaging of the Debris Disk around Beta Pictoris
• Dynamical modeling of large scale asymmetries in the beta Pictoris dust disk
• STIS Coronagraphic Observations of Beta Pictoris
• Discovery of an 86 AU Radius Debris Ring Around HD 181327
• The Inner Rings of Beta Pictoris
• Confidence Level and Sensitivity Limits in High Contrast Imaging
• Rings in the Planetesimal Disk of Beta Pic
• Ground-based near-infrared imaging of the HD141569 circumstellar disk
• Coronagraphic near-IR photometry of AB Dor C
• Planets of Beta Pictoris revisited
• Extrasolar planets and brown dwarfs around A-F type stars III. Beta-Pictoris : looking for planets, finding pulsations
• Analysis of ground-based differential imager performance

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