Chemistry of protosolar-like nebulae: The molecular content of the DM Tau and GG Tau disks.
Abstract
We report the detection of CN, HCN, HNC, CS, HCO^+^, C_2_H and H_2_CO (ortho and para) in the protoplanetary disks of DM Tau and GG Tau. For the first time organic molecules are observed in objects representative of the presolar nebula. These molecules are underabundant with respect to the standard dense clouds. The depletions in the "outer" disk of DM Tau (100<r<900AU), derived from the line intensities and state of excitation, range from f~5 (for CO) to 100 (for H_2_CO). The relatively large abundances of CN and C_2_H are typical of a photon-dominated chemistry.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- January 1997
- Bibcode:
- 1997A&A...317L..55D
- Keywords:
-
- STARS: T TAURI;
- BINARIES: CLOSE;
- CIRCUMSTELLAR MATTER;
- PRE-MAIN SEQUENCE;
- RADIO-LINES: STARS