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 µm photometry .
The survey could detect Zodiacal-like dust , with temperature 200–300 K , at levels of L _ { IR } / L _ { \star } =7 \times 10 ^ { -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 .