Elias 1的空间分辨3微米光谱学：原行星盘中金刚石的起源
Spatially Resolved 3 micron Spectroscopy of Elias 1: Origin of Diamonds in Protoplanetary Disks
摘要：
我们提出了空间分辨的3 μ m光谱的Elias 1获得的自适应光学系统。圆盘的中心部分几乎没有3.3 μ m的PAH发射;它只在30 AU及以上出现。PAH的发射范围可达100 AU，至少达到我们观测的外边界。相比之下，钻石的辐射更集中，柱密度在距离恒星30 AU左右达到峰值。迄今为止，只有三颗赫比格Ae/Be星显示出3.53微米的钻石发射。其中两个有低质量的伴星，可能是造成赫比格Ae/Be恒星观测到的大X射线耀斑的原因。我们推测钻石的起源在拱星盘的石墨材料被转化为钻石的高能粒子的照射下。
英文摘要：
We present spatially resolved 3 um spectra of Elias 1 obtained with an adaptive optics system. The central part of the disk is almost devoid of PAH emission at 3.3 um; it shows up only at 30 AU and beyond. The PAH emission extends up to 100 AU, at least to the outer boundary of our observation. The diamond emission, in contrast, is more centrally concentrated, with the column density peaked around 30 AU from the star. There are only three Herbig Ae/Be stars known to date that show diamond emission at 3.53 um. Two of them have low-mass companions likely responsible for the large X-ray flares observed toward the Herbig Ae/Be stars. We speculate on the origin of diamonds in circumstellar disks in terms of the graphitic material being transformed into diamond under the irradiation of highly energetic particles.
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