THE ABSENCE OF COLD DUST AND THE MINERALOGY AND ORIGIN OF THE WARM DUST ENCIRCLING BD +20 307
THE ABSENCE OF COLD DUST AND THE MINERALOGY AND ORIGIN OF THE WARM DUST ENCIRCLING BD +20 307
复制标题
冷尘埃的缺乏以及围绕 BD 20 307 的暖尘埃的矿物学和起源
DOI：
10.1088/0004-637x/726/2/72
复制
发表时间：
2010
期刊：
影响因子：
--
通讯作者：
B. Zuckerman
中科院分区：
文献类型：
--
作者：
A. Weinberger;E. Becklin;I. Song;B. Zuckerman
斯皮策太空望远镜对BD +20 307的测光和分光显示，这颗年龄为Gyr-old的光谱双星周围的所有尘埃都在1个Au范围内。不需要额外的冷尘来适应红外过量。10和20 μm光谱中的峰值与小硅酸盐非常吻合，这些硅酸盐应该在几年的时间尺度上从系统中移除。这是已知年龄最大的尘埃星星，它是101 Gyr。尘埃不可能从稳态的碰撞级联中产生。两个岩石的行星级天体在陆地区域的灾难性碰撞是这种温暖尘埃的最可能来源，因为它不需要外部系统中的微行星。
Spitzer Space Telescope photometry and spectroscopy of BD +20 307 show that all of the dust around this remarkable Gyr-old spectroscopic binary arises within 1 AU. No additional cold dust is needed to fit the infrared excess. Peaks in the 10 and 20 μm spectrum are well fit with small silicates that should be removed on a timescale of years from the system. This is the dustiest star known for its age, which is ≳1 Gyr. The dust cannot arise from a steady-state collisional cascade. A catastrophic collision of two rocky, planetary-scale bodies in the terrestrial zone is the most likely source for this warm dust because it does not require a reservoir of planetesimals in the outer system.
HD165014 周围富含顽辉石的温暖碎片灰尘
影响因子：
7.9
作者：
Fujiwara;et al.
通讯作者：
et al.