Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007msl..confe.102v&link_type=abstract
"Molecules in Space and Laboratory, meeting held in Paris, France, May 14-18, 2007. Editors: J.L. Lemaire, F. Combes. ISBN: 9782
Astronomy and Astrophysics
Astrophysics
Modelling_Environments
Scientific paper
A model is presented to analyze the chemistry of, and infrared emission from, polycyclic aromatic hydrocarbons (PAHs) in disks around Herbig Ae/Be and T Tauri stars. The model calculates the equilibrium charge and hydrogenation distribution of the PAHs throughout the disk. Destruction of PAHs by ultraviolet (UV) photons, possibly in multi-photon absorption events, is taken into account. The chemistry model is coupled to a radiative transfer code to provide the physical parameters and to combine the PAH emission with the spectral energy distribution (SED) from the star+disk system. In the inner 100 AU of a Herbig disk, PAHs of 50 carbon atoms can only survive below the disk's surface layer. Larger PAHs can survive at higher altitudes at this radius. Hence, the observed emission from 50-C PAHs appears more extended than that of 100-C PAHs. A comparison with spatially resolved observations suggests that most of the observed emission comes from PAHs of at least ~100 carbon atoms.
Augereau J.-Ch.
Dullemond Cornelis Petrus
Geers Vincent Carlo
Pontoppidan Klaus Martin
van Dishoeck Ewine F.
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