Browse > Article
http://dx.doi.org/10.5303/PKAS.2017.32.1.073

SEARCH FOR DEBRIS DISKS BY AKARI AND IRSF  

Takeuchi, Nami (Department of Physics, Graduate School of Science, Nagoya University)
Ishihara, Daisuke (Department of Physics, Graduate School of Science, Nagoya University)
Kaneda, Hidehiro (Department of Physics, Graduate School of Science, Nagoya University)
Oyabu, Shinki (Department of Physics, Graduate School of Science, Nagoya University)
Kobayashi, Hiroshi (Department of Physics, Graduate School of Science, Nagoya University)
Nagayama, Takahiro (Department of Physics and Astronomy, Graduate School of Science and Engineering, Kagoshima University)
Onaka, Takashi (Department of Astronomy, School of Science, University of Tokyo)
Fujiwara, Hideaki (Subaru Telescope, National Astronomical Observatory of Japan)
Publication Information
Publications of The Korean Astronomical Society / v.32, no.1, 2017 , pp. 73-75 More about this Journal
Abstract
Debris disks are important observational clues to understanding on-going planetary system formation. They are usually identified by significant mid-infrared excess on top of the photospheric emission of a central star on the basis of prediction from J-, H-, and Ks-band fluxes and the stellar model spectra. For bright stars, 2MASS near-infrared fluxes suffer large uncertainties due to the near-infrared camera saturation. Therefore we have performed follow-up observations with the IRSF 1.4 m near-infrared telescope located in South Africa to obtain accurate J-, H-, and Ks-band fluxes of the central stars. Among 754 main-sequence stars which are detected in the AKARI $18{\mu}m$ band, we have performed photometry for 325 stars with IRSF. As a result, we have successfully improved the flux accuracy of the central stars from 9.2 % to 0.5 % on average. Using this dataset, we have detected $18{\mu}m$ excess emission from 57 stars in our samples with a $3{\sigma}$ level. We find that some of them have high ratios of the excess to the photospheric emission even around very old stars, which cannot be explained by the current planet-formation theories.
Keywords
infrared: stars; circumstellar matter; planetary systems: formation;
Citations & Related Records
연도 인용수 순위
  • Reference
1 Bryden, G., Beichman, C., A., Carpenter, J., M., et al. 2009, Planets and debris disks: results from a Spitzer/MIPS search for excess, ApJ 705, 1226   DOI
2 Chen, C. H., Patten, B. M., Dowell, C. D., et al. 2005, A Spitzer Study of Dusty Disks around Nearby, Young Stars, ApJ 634, 1372   DOI
3 Fujiwara, H., Ishihara, D., Onaka, T., et al. 2013, AKARI/IRC $18{\mu}m$ survey of warm debris disks, A&A 550, A45   DOI
4 Ishihara, D., Onaka, T., Kataza, H., et al., 2010a, The AKARI/IRC mid-infrared all-sky survey, A&A, 514, A1   DOI
5 Kobayashi, H. & Tanaka, H., 2010, Fragmentation model dependence of collision cascades, Icar, 206, 735   DOI
6 Kurucz, R. L., 1992, in 149, in The Stellar Populations of Galaxies, eds. B. Barbuy, & A. Renzini, IAU Symp., 225
7 McDonald I., Zijlstra, A. A., & Boyer, M. L., 2012, Fundamental parameters and infrared excesses of Hipparcos stars, MNRAS, 427, 343   DOI
8 Perryman, M. A. C., Lindegren, L., Kovalevsky, J., 1997, The Hipparcos Catalogue, A&A 323, L49
9 Wright, C. O., Egan, M. P., Kraemer, K. E., & Price, S. D., 2003, The TYCHO-2 Spectral type catalog, AJ, 125, 359   DOI
10 Wyatt, M. C., R., Smith, J. S., Greaves, et al., 2007, Transience of hot dust around sun-like stars, ApJ, 658, 569   DOI