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arXiv 0903.1333astro-ph.SRastro-ph.EP
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HD 106797周围的热碎屑灰尘

Hot debris dust around HD 106797

Hideaki Fujiwara, Takuya Yamashita, Daisuke Ishihara, Takashi Onaka, Hirokazu Kataza, Takafumi Ootsubo, Misato Fukagawa, Jonathan P. Marshall, Hiroshi Murakami,… 展开作者

Hideaki Fujiwara, Takuya Yamashita, Daisuke Ishihara, Takashi Onaka, Hirokazu Kataza, Takafumi Ootsubo, Misato Fukagawa, Jonathan P. Marshall, Hiroshi Murakami, Takao Nakagawa, Takanori Hirao, Keigo Enya, Glenn J. White

摘要:

A0 V主序星HD 106797与AKARI和双子座/T-ReCS的测光是用来检测超过预期的10和20微米之间的恒星光球层发射,这是最好的归因于热拱星周围的碎片尘埃的恒星。碎片尘埃的温度被推导为Td ~ 190 K,通过假设过量发射近似为一个单一的温度黑体。推导出的温度表明,碎片盘的内半径约为14 AU。碎片盘的分光度比我们自己的黄道带云亮1000倍。在HD 106797周围存在如此大量的热尘埃,不能用碰撞造成碎片盘稳态演变的简单模型来解释,很可能是瞬态事件起了重要作用。我们的数据还显示了一个狭窄的光谱特征之间的11和12微米归因于结晶硅酸盐,这表明尘埃加热过程中发生的碎片盘的HD 106797的形成和演变。

英文摘要:

Photometry of the A0 V main-sequence star HD 106797 with AKARI and Gemini/T-ReCS is used to detect excess emission over the expected stellar photospheric emission between 10 and 20 micron, which is best attributed to hot circumstellar debris dust surrounding the star. The temperature of the debris dust is derived as Td ~ 190 K by assuming that the excess emission is approximated by a single temperature blackbody. The derived temperature suggests that the inner radius of the debris disk is ~ 14 AU. The fractional luminosity of the debris disk is 1000 times brighter than that of our own zodiacal cloud. The existence of such a large amount of hot dust around HD 106797 cannot be accounted for by a simple model of the steady state evolution of a debris disk due to collisions, and it is likely that transient events play a significant role. Our data also show a narrow spectral feature between 11 and 12 micron attributable to crystalline silicates, suggesting that dust heating has occurred during the formation and evolution of the debris disk of HD 106797.

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