Issue |
A&A
Volume 399, Number 2, February IV 2003
|
|
---|---|---|
Page(s) | 773 - 787 | |
Section | Planets and planetary systems | |
DOI | https://doi.org/10.1051/0004-6361:20021638 | |
Published online | 07 February 2003 |
Structure of the DM Tau Outer Disk: Probing the vertical kinetic temperature gradient
1
Institut d'Astrophysique Spatiale, UMR 8617, Bât. 121, Campus Paris XI, 91405 Orsay, France
2
Laboratoire d'Astrophysique de l'Observatoire de Grenoble, BP 53, 38041 Grenoble Cedex 9, France
3
Institut de Radio Astronomie Millimétrique, 300 Rue de la Piscine, 38406 Saint Martin d'Hères, France
Corresponding author: E. Dartois, emmanuel.dartois@ias.u-psud.fr
Received:
20
August
2002
Accepted:
6
November
2002
We use high angular and spectral resolution ( &
0.1 km s-1) images in
,
,
and
coming from
the IRAM interferometer to probe the vertical temperature distribution
in the disk of DM Tau. We investigate here a new method based on the
different opacities of the CO isotopomers to sample the temperature
disk structure at various vertical scales inside the disk. Typically,
the
transitions are sampling at 2–4 scale heights, while the
data are more likely tracing 1 scale height for the
–1, and
the disk mid-plane for the
–0 line. At the disk scale at which the
IRAM observations are sensitive (
–60 AU), the analysis
reveals a vertical temperature gradient. The outer layers
where τ(
are warmer
(
K) than the inner layers probed by
and
data
(
–20 K). These findings are consistent with the structure
expected for flared irradiated disks around TTauri stars. We also observe that
the outer radius of the disk is smaller in
and
than in
.
These differences in truncation radius are in agreement with photodissociation effects. We also note that the dynamical mass determination from CO is weakly affected by the temperature gradient.
Key words: stars: individual: DM Tauri / stars: circumstellar matter / stars: pre-main sequence / radio-lines: stars
© ESO, 2003
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