Morphology of the very inclined debris disk around HD 32297

Abstract

Direct imaging of circumstellar disks at high angular resolution is mandatory to provide morphological information that bring constraints on their properties, in particular the spatial distribution of dust. New techniques combining observing strategy and data processing now allow very high contrast imaging with 8-m class ground-based telescopes (10^-4 to 10^-5 at ~1") and complement space telescopes while improving angular resolution at near infrared wavelengths. We carried out a program at the VLT with NACO to image known debris disks with higher angular resolution in the near IR than ever before in order to study morphological properties and ultimately to detect signpost of planets. The observing method makes use of advanced techniques: Adaptive Optics, Coronagraphy and Differential Imaging, a combination designed to directly image exoplanets with the upcoming generation of "planet finders" like GPI (Gemini Planet Imager) and SPHERE (Spectro-Polarimetric High contrast Exoplanet REsearch). Applied to extended objects like circumstellar disks, the method is still successful but produces significant biases in terms of photometry and morphology. We developed a new model-matching procedure to correct for these biases and hence to bring constraints on the morphology of debris disks. From our program, we present new images of the disk around the star HD 32297 obtained in the H (1.6mic) and Ks (2.2mic) bands with an unprecedented angular resolution (~65 mas). The images show an inclined thin disk detected at separations larger than 0.5-0.6". The modeling stage confirms a very high inclination (i=88°) and the presence of an inner cavity inside r_0~110AU. We also found that the spine (line of maximum intensity along the midplane) of the disk is curved and we attributed this feature to a large anisotropic scattering factor (g~0.5, valid for an non-edge on disk). Abridged ...

12 pages, 10 figures, accepted for publication in Astronomy and Astrophysics

References in corpus (11)

• The James Webb Space Telescope
• Direct Imaging of Multiple Planets Orbiting the Star HR 8799
• Optical Images of an Exosolar Planet 25 Light Years from Earth
• HST/ACS Multiband Coronagraphic Imaging of the Debris Disk around Beta Pictoris
• Confidence Level and Sensitivity Limits in High Contrast Imaging
• On the AU Mic debris disk: density profiles, grain properties and dust dynamics
• On the observability of resonant structures in planetesimal disks due to planetary migration
• An insight in the surroundings of HR4796
• Coronagraphic near-IR photometry of AB Dor C
• 12 and 18 micron images of dust surrounding HD 32297
• VLT/NACO coronagraphic observations of fine structures in the disk of beta Pictoris

Cited by in corpus (31)

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• Modeling Self-Subtraction in Angular Differential Imaging: Application to the HD 32297 Debris Disk
• Modeling the HD32297 Debris Disk with Far-IR Herschel Data
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• New millimeter CO observations of the gas-rich debris disks 49 Cet and HD 32297
• An insight in the surroundings of HR4796
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• Very deep images of the innermost regions of the beta Pictoris debris disc at Lp
• Is the HD 15115 inner disk really asymmetrical ?
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• The Gemini Planet Imager view of the HD 32297 debris disk
• Search for cool giant exoplanets around young and nearby stars - VLT/NaCo near-infrared phase-coronagraphic and differential imaging
• Independent confirmation of β Pictoris b imaging with NICI
• Polarimetry and flux distribution in the debris disk around HD 32297
• Resolved Millimeter Emission from the HD 15115 Debris Disk