Astronomy and Astrophysics – Astronomy
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011iaus..280p..79a&link_type=abstract
The Molecular Universe, Posters from the proceedings of the 280th Symposium of the International Astronomical Union held in Tole
Astronomy and Astrophysics
Astronomy
Scientific paper
This talk presents observations of a protoplanetary disk in group II around Herbig Ae star HD163296 in 12CO (J=1--0), 12CO (J=3--2), 13CO (J=1--0), and 13CO (J=3--2) emission lines. Clear double peak emission profiles from the rotating circumstellar disk obtained in all CO emission lines were fitted with the results calculated by a classical power-law disk model to determine physical properties of the disk. As results of the calculated surface density and the observed peak intensity ratio between 12CO and 13CO in both rotational transitions, the disk is optically thick for all CO lines. Temperature and surface density obtained by our single dish observations were confirmed to be consistent with the results of interferometric observations. Taking advantage of different optical depth of each CO emission line, we revealed a temperature distribution in vertical direction. It is found that high temperature region must exist in the upper surface and at least two distinct temperature layers are formed near the scale height; about 200 K in the interior and 470 K in the upper layer at 1 AU in radius. Moreover, a middle layer of about 350 K might exist and probably reflects a temperature gradient in the disk. Since vertical temperature distribution inside of disks around both T Tauri and Herbig Ae stars (e.g., DM Tau, AB Aur, and HD31648) is seen, this vertical temperature structure is generally ubiquitous in protoplanetary disks.
Akiyama Eiji
Hayashi Hirotaka
Kitamura Yoshimi
Momose Munetake
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