Small carbon grains in circumstellar disks

Details Small carbon grains in circumstellar disks Small carbon grains in circumstellar disks

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sf2a.conf..421h&link_type=abstract

SF2A-2005: Semaine de l'Astrophysique Francaise, meeting held in Strasbourg, France, June 27 - July 1, 2005, Edited by F. Casoli

Physics

Optics

Scientific paper

We investigate the presence and properties of polycyclic aromatic hydrocarbons (PAHs) in circumstellar disks around pre-main-sequence stars of intermediate mass. By comparing the observations from ISO and ground based telescopes with predictions of disk models (that includes PAHs and small grains in addition to large grains), we show that PAHs are present in disks, and absorb a significant fraction of the stellar radiation, similarly to PAHs in the interstellar medium. Moreover, using adaptive optics high angular resolution (˜0.1'') spectroscopic observations at 3 μm, we were able, for the first time, to spatially resolve the inner disk emission, in both the PAH and (nano-)diamond emission features. These data provide a benchmark for testing the dust evolution within the disks but also the disk properties.

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