Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-01-12
Astrophys.J.656:L93-L96,2007
Astronomy and Astrophysics
Astrophysics
11 pages, 2 figures, accepted to ApJL
Scientific paper
10.1086/512674
In a disk around DM Tau, previous observation of 13CO (J=2-1 and 1-0 transitions) derived the 13CO gas temperature of \sim 13-20K, which is lower than the sublimation temperature of CO (20 K). We argue that the existence of such cold CO can be explained by a vertical mixing of disk material. As the gas is transported from a warm layer to a cold layer, CO is depleted onto dust grains with a timescale of \sim 10^3 yr. Because of the steep temperature gradient in the vertical direction, an observable amount of CO is still in the gas phase when the fluid parcel reaches the layer of \sim 13 K. Apparent temperature of CO decreases as the maximum grain size increases from micron-size to mm-size.
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