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Planets are formed in disks around young stars. With an age of ~10 Myr, TWHya is one of the nearest T Tauri stars that is still surrounded by arelatively massive disk. In addition a large number of molecules has been foundin the TW Hya disk, making TW Hya the perfect test case in a large survey ofdisks with Herschel-PACS to directly study their gaseous component. We aim toconstrain the gas and dust mass of the circumstellar disk around TW Hya. Weobserved the fine-structure lines of [OI] and [CII] as part of the Open-timelarge program GASPS. We complement this with continuum data and ground-based12CO 3-2 and 13CO 3-2 observations. We simultaneously model the continuum andthe line fluxes with the 3D Monte-Carlo code MCFOST and the thermo-chemicalcode ProDiMo to derive the gas and dust masses. We detect the [OI] line at 63micron. The other lines that were observed, [OI] at 145 micron and [CII] at 157micron, are not detected. No extended emission has been found. Preliminarymodeling of the photometric and line data assuming [12CO]/[13CO]=69 suggests adust mass for grains with radius < 1 mm of ~1.9 times 10^-4 Msun (total solidmass of 3 times 10^-3 Msun) and a gas mass of (0.5--5) times 10^-3 Msun. Thegas-to-dust mass may be lower than the standard interstellar value of 100.

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