Herschel-PACS observation of the 10 Myr old T Tauri disk TW Hya: Constraining the disk gas mass

Abstract

Planets are formed in disks around young stars. With an age of ~10 Myr, TW Hya is one of the nearest T Tauri stars that is still surrounded by a relatively massive disk. In addition a large number of molecules has been found in the TW Hya disk, making TW Hya the perfect test case in a large survey of disks with Herschel-PACS to directly study their gaseous component. We aim to constrain the gas and dust mass of the circumstellar disk around TW Hya. We observed the fine-structure lines of [OI] and [CII] as part of the Open-time large program GASPS. We complement this with continuum data and ground-based 12CO 3-2 and 13CO 3-2 observations. We simultaneously model the continuum and the line fluxes with the 3D Monte-Carlo code MCFOST and the thermo-chemical code ProDiMo to derive the gas and dust masses. We detect the [OI] line at 63 micron. The other lines that were observed, [OI] at 145 micron and [CII] at 157 micron, are not detected. No extended emission has been found. Preliminary modeling of the photometric and line data assuming [12CO]/[13CO]=69 suggests a dust mass for grains with radius < 1 mm of ~1.9 times 10^-4 Msun (total solid mass of 3 times 10^-3 Msun) and a gas mass of (0.5--5) times 10^-3 Msun. The gas-to-dust mass may be lower than the standard interstellar value of 100.

6 pages, 6 figures, accepted for publication in the A&A Herschel special issue

References in corpus (10)

• Herschel Space Observatory - An ESA facility for far-infrared and submillimetre astronomy
• The Photodetector Array Camera and Spectrometer (PACS) on the Herschel Space Observatory
• Monte Carlo radiative transfer in protoplanetary disks
• An Inner Hole in the Disk around TW Hydrae Resolved in 7 Millimeter Dust Emission
• Line Emission from Gas in Optically Thick Dust Disks around Young Stars
• High spatial resolution mid-infrared observations of the low-mass young star TW Hya
• Chemical Modelling of Young Stellar Objects, I. Method and Benchmarks
• Atomic Diagnostics of X-ray Irradiated Protoplanetary Disks
• Gas in the protoplanetary disc of HD 169142: Herschel's view
• The Herschel view of Gas in Protoplanetary Systems (GASPS). First comparisons with a large grid of models

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