Mid-Infrared Imaging of a Circumstellar Disk around HR 4796: Mapping the Debris of Planetary Formation

  title={Mid-Infrared Imaging of a Circumstellar Disk around HR 4796: Mapping the Debris of Planetary Formation},
  author={David William Koerner and Michael E. Ressler and Michael W. Werner and Dana E. Backman},
  journal={The Astrophysical Journal Letters},
  pages={L83 - L87}
We report the discovery of a circumstellar disk around the young A0 star HR 4796 in thermal infrared imaging carried out at the W. M. Keck Observatory. By fitting a model of the emission from a flat dusty disk to an image at λ=20.8 μm, we derive a disk inclination, i=72°+6°-9° from face-on, with the long axis of emission at P.A. 28° ± 6°. The intensity of emission does not decrease with radius, as expected for circumstellar disks, but increases outward from the star, peaking near both ends of… 

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