  A search for previously undetected optically thin disks around stars in the
nearby, young, TW Hydrae Association was conducted around sixteen stars with
sensitive 12 and 18 micron photometry. The survey could detect Zodiacal-like
dust, with temperature 200-300 K, at levels of L(IR)/L(*)=7e-3. Possible
mid-infrared excess emission from TWA 17 was detected at the 2-sigma level, but
none of the other stars showed evidence for circumstellar dust. The rapid
disappearance of large amounts of dust around the K and M-type stars in this
sample may mean that any planet formation in the terrestrial planet region was
completed very quickly. There appears to be a bi-modal distribution of dust
disks in TWA with stars having either copious or negligible warm dust.
