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We present Herschel PACS photometry of seventeen B- to M-type stars in the 30Myr-old Tucana-Horologium Association. This work is part of the Herschel OpenTime Key Programme "Gas in Protoplanetary Systems" (GASPS). Six of theseventeen targets were found to have infrared excesses significantly greaterthan the expected stellar IR fluxes, including a previously unknown disk aroundHD30051. These six debris disks were fitted with single-temperature blackbodymodels to estimate the temperatures and abundances of the dust in the systems.For the five stars that show excess emission in the Herschel PACS photometryand also have Spitzer IRS spectra, we fit the data with models of opticallythin debris disks with realistic grain properties in order to better estimatethe disk parameters. The model is determined by a set of six parameters:surface density index, grain size distribution index, minimum and maximum grainsizes, and the inner and outer radii of the disk. The best fitting parametersgive us constraints on the geometry of the dust in these systems, as well aslower limits to the total dust masses. The HD105 disk was further constrainedby fitting marginally resolved PACS 70 micron imaging.

Herschel PACS Observations and Modeling of Debris Disks in the Tucana-Horologium Association