Is the silicate emission feature only influenced by grain size?

Details Is the silicate emission feature only influenced by grain size? Is the silicate emission feature only influenced by grain size?

2008-03-23

arxiv.org/abs/0803.3227v2

Astronomy and Astrophysics

Astrophysics

accepted by Astronomy & Astrophysics Letters; small revision after referee report

Scientific paper

10.1051/0004-6361:200809697

The flattening of the 10mu silicate emission feature observed in the spectra of T Tauri and Herbig Ae/Be stars is usually interpreted as an indicator of grain growth. We show in this paper that a similar behaviour of the feature shape occurs when the porosity of composite grains varies. The fluffy aggregates, having inclusions of different sizes, were modeled by multi-layered spheres consisting of amorphous carbon, amorphous silicate and vacuum. It is also found that the inclusion of crystalline silicates in composite porous particles can lead to a shift of the known resonances and production of new ones.

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