NOAO >   Observing Info >   Approved Programs >   2003B-0121

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Proposal Information for 2003B-0121


PI: Gwendolyn Meeus, Astrophysikalisches Institut Postdam, gwen@aip.de
Address: Star and Planet formation Group, An der Sternwarte 16, Potsdam 14482, Germany

CoI: Ray Jayawardhana, University of Michigan
CoI: Jeroen Bouwman, Institut d'Astrophysique, Saclay

Title: Probing dust composition in protoplanetary disks

Abstract: We propose to study the characteristics of dust in protoplanetary disks around T Tauri stars (TTS). A good tracer of dust processing is the 10 \micron silicate feature; several Polycyclic Aromatic Hydrocarbon (PAH) features appear in the same spectral region. The shape and strength of the 10 \micron feature reveals clues about the size distribution, solid state (amorphous/crystalline) and composition of the emitting dust grains, which are valuable tracers for the dust processing history. A similar study was carried out with ISO-SWS for the more massive Herbig Ae/Be stars; for TTS only low S/N spectra were available. A subsequent step is to compare the derived dust properties of TTS with that of Herbig Ae/Be stars. The ultimate goal is to understand dust processing and subsequent planet formation around both classes of objects. For this purpose, we propose to use LWS on Keck-I to obtain intermediate resolution N-band spectra of a sample of TTS associated with the MBM12 cloud.


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