Fir View of Disks of Weak-Line T Tauri Stars (original) (raw)
2017, Publications of The Korean Astronomical Society
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 WIDES band. Then, we have performed stacking analysis of these WTTSs using the WIDES band images to improve the sensitivity. However, we could not detect any significant emission in the resultant image with a noise level of 0.05 MJy sr −1 , or 3 mJy for a point source. The three-sigma upper limit of 9 mJy leads to the disk dust mass of 0.01 M ⊕. This result suggests that the disks around Chamaeleon WTTSs are already evolved to debris disks.
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