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The Korean Astronomical Society (한국천문학회)
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FIR VIEW OF DISKS OF WEAK-LINE T TAURI STARS

  • Takita, Satoshi (Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency) ;
  • Doi, Yasuo (Department of Earth Science and Astronomy, The University of Tokyo) ;
  • Arimatsu, Ko (Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency) ;
  • Ootsubo, Takafumi (Department of Earth Science and Astronomy, The University of Tokyo) ;
  • AKARI Team
  • Received : 2016.09.14
  • Accepted : 2016.11.04
  • Published : 2017.03.31
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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 $0.05MJy\;sr^{-1}$, or 3 mJy for a point source. The three-sigma upper limit of 9 mJy leads to the disk dust mass of $0.01M_{\oplus}$. This result suggests that the disks around Chamaeleon WTTSs are already evolved to debris disks.

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References

  1. Adams, F. C., Lada, C. J., & Shu, F. H., 1988, The disks of T Tauri stars with at infrared spectra , ApJ, 326, 865 https://doi.org/10.1086/166144
  2. Alcala, J. M., Krautter, J., Schmitt, J. H. M. M., et al., 1995, A study of the Chamaeleon star forming region from the ROSAT all-sky survey. I. X-ray observations and optical identifications , A&AS, 114, 109
  3. Alcala, J. M., Krautter, J., Covino, E., et al., 1997, A study of the Chamaeleon star-forming region from the ROSAT All-Sky Survey. II. The pre-main sequence population, A&A, 319, 184
  4. Arimatsu, K., Doi, Y., Wada, T., et al., 2014, Point source calibration of the AKARI/FIS all-sky survey maps for stacking analysis, PASJ, 66, 47 https://doi.org/10.1093/pasj/psu010
  5. Doi, Y., Komugi, S., Kawada, M., et al., 2012, Akari Far-Infrared All-Sky Survey Maps, PKAS, 27, 111
  6. Kawada, M., Baba, H., Barthel, P. D., et al., 2007, The Far-Infrared Surveyor (FIS) for AKARI, PASJ, 59, 389 https://doi.org/10.1093/pasj/59.sp2.S389
  7. Murakami, H., Baba, H., Barthel, P., et al., 2007, The Infrared Astronomical Mission AKARI, PASJ, 59, 369 https://doi.org/10.1093/pasj/59.sp2.S369
  8. Murphy, S. J., Lawson, W. A., & Bessell, M. S., 2013, Reexamining the membership and origin of the Cha association, MNRAS, 435, 1325 https://doi.org/10.1093/mnras/stt1375
  9. Wyatt, M. C., 2008, Evolution of Debris Disks, ARAA, 46, 339 https://doi.org/10.1146/annurev.astro.45.051806.110525