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Observations of the Chemistry in Circumstellar Disks

Published online by Cambridge University Press:  25 May 2016

A. Dutrey ,
S. Guilloteau  and
M. Guélin
A. Dutrey
Affiliation:
IRAM, 300 rue de la Piscine, F-38406 Saint-Martin-d'Hères, France
S. Guilloteau
Affiliation:
IRAM, 300 rue de la Piscine, F-38406 Saint-Martin-d'Hères, France
M. Guélin
Affiliation:
IRAM, 300 rue de la Piscine, F-38406 Saint-Martin-d'Hères, France

Abstract

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Circumstellar disks around classical T Tauri stars have still large amounts of primary molecular gas and dust, which may evolve to form planetary systems. Although it is the remnant of the parental cloud, the gas component shows significant chemical evolution. Fundamental disk properties (kinematics, size, temperature profile) can be derived from observations of CO lines with mm arrays. Less abundant molecules have been discovered with the IRAM 30-m telescope, in the DM Tau and GG Tau disks. Despite the high depletion factors which are measured with respect to the nearby Taurus cloud, these molecules allow independent measurements of the disk density. These observations provide an overview of the properties of young (a few Myr) proto-planetary disks around low-mass stars as seen by current mm instruments.

Type
Part 7. Circumstellar Disks
Information
Symposium - International Astronomical Union , Volume 197: Astrochemistry: From Molecular Clouds to Planetary Systems , 2000 , pp. 415 - 423
Copyright
Copyright © Astronomical Society of the Pacific 2000 

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