Imaging An Extended Gaseous Disk around a Weak-Lined T Tauri Star

Details Imaging An Extended Gaseous Disk around a Weak-Lined T Tauri Star Imaging An Extended Gaseous Disk around a Weak-Lined T Tauri Star

Feb 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007noao.prop..518j&link_type=abstract

NOAO Proposal ID #2007A-0518

Computer Science

Scientific paper

Protoplanetary disks provide the raw material for planet formation, and understanding their evolution, particularly of the disk gas, is important for constraining planet formation theories. We propose imaging of the young star DoAr 21, one of the few stars to show clear evidence of a largely gaseous disk through H_2 emission but no near- infrared excess. We propose to image DoAr 21 in the PAH bands near 10 µ to probe the extent and ionization structure of its gaseous disk. Our observations will map the ratio of PAH lines across the disk, tracing PAH ionization as a function of disk radius in order to distinguish between competing hypotheses about the source of excitation of the disk gas. We also will explore the spatial extent of DoAr 21's disk at 20 micron, which was recently resolved with a surprisingly large spatial extent by Spitzer . Gemini's excellent spatial resolution will complement the Spitzer data to reveal the structure of the disk around this 0.5-Myr-old, 2.2 M_&sun; star.

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