What Can We Learn from the Infrared Spectral Energy Distributions of Dust Disks?

Details What Can We Learn from the Infrared Spectral Energy Distributions of Dust Disks? What Can We Learn from the Infrared Spectral Energy Distributions of Dust Disks?

2002-07-30

arxiv.org/abs/astro-ph/0207642v1

Astronomy and Astrophysics

Astrophysics

10 pages, 2 figures, submitted to ApJ Letters

Scientific paper

The spectral energy distributions (SEDs) of dust disks are widely used to infer dust properties (compositions and sizes) and disk structures (dust spatial distributions) which might be indicative of the presence or absence of planets or smaller bodies like asteroids and comets in the disk. Based on modelling of the SED of HR 4796A, a young main-sequence star with the largest fractional infrared (IR) emission, we show that the SED alone is not a good discriminator of dust size, spatial distribution (and composition if no spectroscopic data are available). A combination of SED, mid-IR spectroscopy, and coronagraphic near-IR imaging of scattered starlight and mid-IR imaging of dust thermal emission provides a better understanding of these properties.

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