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Astron. Astrophys. 317, L55-L58 (1997)

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Letter to the Editor

Chemistry of Protosolar-like nebulae:

The molecular content of the DM Tau and GG Tau disks

A. Dutrey , S. Guilloteau and M. Guélin

Institut de Radio Astronomie Millimétrique, 300 Rue de la Piscine, F-38406 Saint Martin d'Hères, France

Received 26 September 1996 / Accepted 1 November 1996


We report the detection of CN, HCN, HNC, CS, HCO [FORMULA], C2 H and H2 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 ([FORMULA] AU), derived from the line intensities and state of excitation, range from [FORMULA] (for CO) to 100 (for H2 CO). The relatively large abundances of CN and C2 H are typical of a photon-dominated chemistry.

Key words: Stars: T Tauri – binaries: close – circumstellar matter – pre-main sequence – Radio-lines: stars

© European Southern Observatory (ESO) 1997

Online publication: July 8, 1998