Issue |
A&A
Volume 461, Number 3, January III 2007
|
|
---|---|---|
Page(s) | 983 - 990 | |
Section | Interstellar and circumstellar matter | |
DOI | https://doi.org/10.1051/0004-6361:20065174 | |
Published online | 12 September 2006 |
Searching for gas-rich disks around T Tauri stars in Lupus
Leiden Observatory, PO Box 9513, 2300 RA Leiden, The Netherlands e-mail: kempen@strw.leidenuniv.nl
Received:
9
March
2006
Accepted:
7
June
2006
Aims.We characterize the molecular environment of classical T Tauri stars in Lupus observed with the Spitzer Space Telescope in our search for gas-rich disks toward these sources.
Methods.Submillimeter observations of 12CO, 13CO, and C18O in the –2 and 2–1 lines were obtained with the James Clerk Maxwell Telescope toward a sample of 21 T Tauri stars with disks in the Lupus molecular clouds. Pointings at the sources and at selected off-positions are presented in order to disentangle material associated with disks from ambient cloud
material.
Results.One source, IM Lup (Sz 82), was found with the
double-peaked 12CO and 13CO profiles characteristic of a
large rotating gas disk. The inclination of the disk is found to be ~, with an outer radius of 400–700 AU. For most other sources, including GQ Lup with its
substellar companion, the single-dish 12CO lines are dominated by extended cloud emission with a complex velocity structure. No evidence of molecular outflows is found.
Due to dense circumstellar material, compact C18O emission was detected toward only two sources. Future searches for gas-rich disks in Lupus should either use interferometers or
perform very deep single-dish integrations in dense gas tracers to
separate the cloud and disk emission.
Key words: accretion, accretion disks / radiative transfer / methods: observational / stars: pre-main sequence / radio lines: ISM / stars: circumstellar matter
© ESO, 2007
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