Probing the gaseous disk of T Tau N with CN 5-4 lines
| Autor: | Podio, L., Kamp, I., Codella, C., Nisini, B., Aresu, G., Brittain, S., Cabrit, S., Dougados, C., Grady, C., Meijerink, R., Sandell, G., Spaans, M., Thi, W. -F., White, G. J., Woitke, P. |
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| Rok vydání: | 2014 |
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| Druh dokumentu: | Working Paper |
| DOI: | 10.1088/2041-8205/783/2/L26 |
| Popis: | We present spectrally resolved Herschel/HIFI observations of the young multiple system T Tau in atomic and molecular lines. While CO, H2O, [C II], and SO lines trace the envelope and the outflowing gas up to velocities of 33 km/s with respect to systemic, the CN 5-4 hyperfine structure lines at 566.7, 566.9 GHz show a narrow double-peaked profile centered at systemic velocity, consistent with an origin in the outer region of the compact disk of T Tau N. Disk modeling of the T Tau N disk with the thermo-chemical code ProDiMo produces CN line fluxes and profiles consistent with the observed ones and constrain the size of the gaseous disk (R_out = 110 (+10, -20) AU) and its inclination (i = 25 \pm 5 degree). The model indicates that the CN lines originate in a disk upper layer at 40-110 AU from the star, which is irradiated by the stellar UV field and heated up to temperatures of 50-700 K. With respect to previously observed CN 2-1 millimeter lines, the CN 5-4 lines appear to be less affected by envelope emission, due to their larger critical density and excitation temperature. Hence, high-J CN lines are a unique confusion-free tracer of embedded disks, such as the disk of T Tau N. Comment: 6 pages, 3 figures, accepted for publication on ApJ Letters |
| Databáze: | arXiv |
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