Abstract
We have observed ~60 Weak-line T Tauri stars (WTTSs) toward the Chamaeleon star forming region using the AKARI Far-Infrared Surveyor (FIS) All-Sky maps. We could not detect any significant emission from each source even at the most sensitive WIDE-S band. Then, we have performed stacking analysis of these WTTSs using the WIDE-S band images to improve the sensitivity. However, we could not detect any significant emission in the resultant image with a noise level of <TEX>$0.05MJy\;sr^{-1}$</TEX>, or 3 mJy for a point source. The three-sigma upper limit of 9 mJy leads to the disk dust mass of <TEX>$0.01M_{\oplus}$</TEX>. This result suggests that the disks around Chamaeleon WTTSs are already evolved to debris disks.
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