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DEBRIS DISKS EXPLORED BY AKARI AND IRSF

  • Kiriyama, Y. ;
  • Ishihara, D. ;
  • Nagayama, T. ;
  • Kaneda, H. ;
  • Oyabu, S. ;
  • Onaka, T. ;
  • Fujiwara, H.
  • Received : 2012.06.30
  • Accepted : 2012.08.20
  • Published : 2012.09.16

Abstract

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 $18{\mu}m$. 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.

Keywords

infrared;stars: infrared;planetary systems: surveys

References

  1. Fujiwara, H., et al., 2010, Silica-rich Bright Debris Disk around HD 15407A, ApJ, 749, L29
  2. Ishihara, D., et al., 2010, The AKARI/IRC Mid- Infrared All-Sky Survey, A&A, 514, 1
  3. Kurucz, R. L., 2013, Model Atmospheres for Population Synthesis, IAUS, 149, 225
  4. Wright, C. O., et al., 2003, The Tycho-2 Spectral Type Catalog, AJ, 125, 359 https://doi.org/10.1086/345511
  5. Wyatt, M. C., 2005, Dust in Resonant Extrasolar Kuiper Belts: Grain Size and Wavelength Dependence of Disk Structure, ApJ, 639, 1153

Acknowledgement

Supported by : Japan Society for the Promotion of Science (JSPS)