Modeling the Infrared Emission from the HR 4796A Disk

Abstract

We model the spectral energy distribution (SED) from the mid-infrared to submillimeter of the ring-like disk of HR 4796A, the dustiest A-type star. We consider dust made either of coagulated but otherwise unaltered protostellar interstellar grains, or grains that are highly-processed in a protostellar/protoplanetary nebula with silicate dust annealed and carbon dust oxidized. Both types of dust are successful in reproducing the observed SED, provided that the grains are highly fluffy, with a vacuum volume fraction of \~90%. We find no evidence for the existence of a hot ``zodiacal dust'' component a few AU from the star, which was suggested by previous workers to account for the 10 micron-wavelength emission.

published in The Astrophysical Journal, vol. 590, pp. 368--378; 26 pages; 9 figures

References in corpus (11)

• Infrared Emission from Interstellar Dust. II. The Diffuse Interstellar Medium
• How Observations of Circumstellar Disk Asymmetries Can Reveal Hidden Planets: Pericenter Glow and its Application to the HR 4796 Disk
• NICMOS Imaging of the HR 4796A Circumstellar Disk
• On Ultrasmall Silicate Grains in the Diffuse Interstellar Medium
• Mid-infrared Imaging of a Circumstellar Disk Around HR 4796: Mapping the Debris of Planetary Formation
• Dusty Debris Around Solar-Type Stars: Temporal Disk Evolution
• A dust disk surrounding the young A star HR4796A
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• Dust Distribution in Gas Disks. A Model for the Ring Around HR 4796A
• Forming the Dusty Ring in HR 4796A
• Silicate Emission in the TW Hydrae Association

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