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Detection of abundant solid CO in the disk around CRBR 2422.8-3423 | | W.F. Thi
; K.M. Pontoppidan
; E.F. van Dishoeck
; E. Dartois
; L. d’Hendecourt
; | | Date: |
20 Sep 2002 | | Journal: | Astron.Astrophys. 394 (2002) L27 | | Subject: | astro-ph | | Affiliation: | 1 and 2), K.M. Pontoppidan , E.F. van Dishoeck , E. Dartois and L. d’Hendecourt ( University College London, UK Leiden Observatory, The Netherlands, Institut d’Astrophysique Spatiale, France | | Abstract: | We present direct evidence for CO freeze-out in a circumstellar disk around the edge-on class I object CRBR 2422.8-3423, observed in the M band with VLT-ISAAC at a resolving power R~10,000. The spectrum shows strong solid CO absorption, with a lower limit on the column density of 2.2E18 cm-2. The solid CO column is the highest observed so far, including high-mass protostars and background field stars. Absorption by foreground cloud material likely accounts for less than 10% percent of the total solid CO, based on the weakness of solid CO absorption toward nearby sources and the absence of gaseous C18O J=2-1 emission 30’’ south. Gas-phase ro-vibrational CO absorption lines are also detected with a mean temperature of 50 +/-10 K. The average gas/solid CO ratio is ~1 along the line of sight. For an estimated inclination of 20 +/- 5 degree, the solid CO absorption originates mostly in the cold, shielded outer part of the flaring disk, consistent with the predominance of apolar solid CO in the spectrum and the non-detection of solid OCN-, a thermal/ultraviolet processing of the ice mantle. The gaseous CO comes from the warm upper layers closer to the star. | | Source: | arXiv, astro-ph/0209428 | | Services: | Forum | Review | PDF | Favorites | |
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