Using the AKARI mid-infrared all-sky survey catalogue, we are searching for debris disks which are important objects as an observational clue to on-going planetary system formation. Debris disk candidates are selected through a significant excess of the measured flux over the predicted flux for the stellar photospheric emission at 18 μm . The fluxes were originally estimated based on the near-infrared spectral energy distributions (SEDs) of central stars constructed from the 2MASS J-, H-, and Ks-band fluxes. However, we found that in many cases the 2MASS photometry has large errors due to saturation in the central part of a star image. Therefore we performed follow-up observations with the IRSF 1.4m near-infrared telescope in South Africa to obtain accurate fluxes in the J-, H-, and Ks-bands. As a result, we have succeeded in improving the SEDs of the central stars. This improvement of the SEDs allows us to make more reliable selection of the candidates.

ABSTRACT
1. INTRODUCTION
2. OBSERVATION AND DATA ANALYSIS
    2.1. Sample Selection
    2.2. IRSF Observation
3. RESULTS
4. SUMMARY
REFERENCES

• Y. KIRIYAMA(Graduate School of Science, Nagoya University)
• D, ISHIHARA(Graduate School of Science, Nagoya University)
• T. NAGAYAMA(Graduate School of Science, Nagoya University)
• H. KANEDA(Graduate School of Science, Nagoya University)
• S. OYABU(Graduate School of Science, Nagoya University)
• T. ONAKA(Graduate School of Science, University of Tokyo)
• H. FUJIWARA(Subaru Telescope, National Astronomical Observatory of Japan)