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Context. Circumstellar discs are the places where planets form, thereforeknowledge of their evolution is crucial for our understanding of planetformation. The Herschel Space Observatory is providing valuable data forstudying disc systems, thanks to its sensitivity and wavelength coverage. Thispaper is one of several devoted to analysing and modelling Herschel-PACSobservations of various young stellar associations from the GASPS Open Time KeyProgramme. Aims. The aim of this paper is to elucidate the gas and dustproperties of circumstellar discs in the 10 Myr TW Hya Association (TWA) usingnew far-infrared (IR) imaging and spectroscopy from Herschel-PACS. Methods. Weobtained far-IR photometric data at 70, 100, and 160 microns of 14 TWA members;spectroscopic observations centred on the [OI] line at 63.18 microns were alsoobtained for 9 of the 14. The new photometry for each star was incorporatedinto its full spectral energy distribution (SED). Results. We detected excessIR emission that is characteristic of circumstellar discs from five TWAmembers, and computed upper limits for another nine. Two TWA members (TWA 01and TWA 04B) also show [OI] emission at 63.18 microns. Discs in the TWAassociation display a variety of properties, with a wide range of dust massesand inner radii, based on modified blackbody modelling. Both transitional anddebris discs are found in the sample. Models for sources with a detected IRexcess give dust masses in the range from 0.15 Msun to 63 Msun.

Gas and dust in the TW Hydrae Association as seen by the Herschel Space Observatory