New Probes of the Chemistry in the Inner Regions of Planet-Forming Disks

Details New Probes of the Chemistry in the Inner Regions of Planet-Forming Disks New Probes of the Chemistry in the Inner Regions of Planet-Forming Disks

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011iaus..280p..89b&link_type=abstract

The Molecular Universe, Posters from the proceedings of the 280th Symposium of the International Astronomical Union held in Tole

Astronomy and Astrophysics

Astronomy

Scientific paper

The study of warm molecular gas in the inner regions (<10 AU) of circumstellar disks around stars is of significant importance to understand how planets are forming. Mid-infrared Spitzer spectra have detected H2O, OH, HCN and C2H2 in these regions, but their low spectral resolution does not allow a quantitative analysis. In contrast, the VLT-CRIRES instrument with a resolving power of 100000 provides fully resolved profiles. We present one of the first near-infrared (3-5 micron) searches for various molecules from these regions, including detections of HCN, H2O, OH and tentatively C2H2, CH4 and NH3. We present results from a non-LTE excitation 2D radiative transfer model coupled with the ray-tracing program RADLite (Pontoppidan et al. 2009) of the HCN lines from which the HCN abundance structure can be determined. The temperature and abundances of different molecular species in the various layers of the disk can be extracted from the emission profiles and from the intensities of the lines at 3 and 14 micron. These results give important information about which type of chemistry dominates in the inner disk, and ultimately which complex molecules can be formed. This helps to constrain chemical models of disks and planet formation.

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