HR 4796 A磁盘中的复杂有机材料？
Complex Organic Materials in the HR 4796A Disk?
摘要：
在年轻的主序星HR 4796 A周围的边缘锐利的环状圆盘的可见光到近红外反射光谱的红色光谱形状最近被解释为存在于土卫六的大气和表面以及太阳系中冰冷天体表面的类似托林的复杂有机物质。然而，我们在这封信中表明，由常见的宇宙尘埃物种（无定形硅酸盐，无定形碳和水冰）组成的多孔颗粒也很接近地再现了观测到的反射光谱，这表明HR 4796盘中存在复杂的有机材料仍然不是确定的。
英文摘要：
The red spectral shape of the visible to near infrared reflectance spectrum of the sharply-edged ring-like disk around the young main sequence star HR 4796A was recently interpreted as the presence of tholin-like complex organic materials which are seen in the atmosphere and surface of Titan and the surfaces of icy bodies in the solar system. However, we show in this Letter that porous grains comprised of common cosmic dust species (amorphous silicate, amorphous carbon, and water ice) also closely reproduce the observed reflectance spectrum, suggesting that the presence of complex organic materials in the HR 4796 disk is still not definitive.
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