HD169142 星周遷移円盤の中間赤外線撮像－間隙サイズの計測－

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原著　2011 年度神奈川大学総合理学研究所共同研究助成論文The disk around the Herbig Ae star HD169142 was imaged and resolved at 18．8 and 24．5 μm using Subaru／COMICS. We interpreted the observations using a 2D radiative transfer model and found evidence for the presence of a large gap．MIR images trace dust emits at the onset of a strong rise in the spectral energy distribution（SED）at 20 μm；therefore，they are very sensitive to the location and characteristics of the inner wall of the outer disk and its dust．We determined the location of the wall to be 23 ＋3 －5 AU from the star．An extra component of hot dust must therefore exist close to the star．We found that a hydrostatic optically thick inner disk does not produce enough flux in the NIR and an optically thin geometrically thick component was our solution to fit the SED．Considering the recent findings of gaps and holes in a number of Herbig Ae／Be group I disks，we suggest that such disk structures may be common in group I sources．Classification as group I should be considered to support the classification as a transitional disk，although improved imaging surveys are needed to support this speculation．
2012-06-30