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Water Depletion in the Disk Atmosphere of Herbig AeBe Stars

Abstract : We present high-resolution (R ~ 100,000) L-band spectroscopy of 11 Herbig AeBe stars with circumstellar disks. The observations were obtained with the VLT/CRIRES to detect hot water and hydroxyl radical emission lines previously detected in disks around T Tauri stars. OH emission lines are detected toward four disks. The OH 2Π3/2 P4.5 (1+,1-) doublet is spectrally resolved as well as the velocity profile of each component of the doublet. Its characteristic double-peak profile demonstrates that the gas is in Keplerian rotation and points to an emitting region extending out to ~15-30 AU. The OH emission correlates with disk geometry as it is mostly detected toward flaring disks. None of the Herbig stars analyzed here show evidence of hot water vapor at a sensitivity similar to that of the OH lines. The non-detection of hot water vapor emission indicates that the atmospheres of disks around Herbig AeBe stars are depleted of water molecules. Assuming LTE and optically thin emission we derive a lower limit to the OH/H2O column density ratio >1-25 in contrast to T Tauri disks for which the column density ratio is 0.3-0.4.

Based on observations collected at the European Southern Observatory, Paranal, Chile (Proposal ID: 082.C-0491).

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https://hal-insu.archives-ouvertes.fr/insu-03625122
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Submitted on : Wednesday, March 30, 2022 - 4:30:48 PM
Last modification on : Thursday, March 31, 2022 - 4:33:58 AM

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D. Fedele, I. Pascucci, S. Brittain, I. Kamp, P. Woitke, et al.. Water Depletion in the Disk Atmosphere of Herbig AeBe Stars. The Astrophysical Journal, 2011, 732, ⟨10.1088/0004-637X/732/2/106⟩. ⟨insu-03625122⟩

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