HD 113766中类地行星形成产生的星周尘埃
Circumstellar Dust Created by Terrestrial Planet Formation in HD 113766
摘要：
我们提出了一个分析的气体贫拱星材料的HD 113766二元系统（F3/F5，10 - 16百万年），最近观察到的斯皮策太空望远镜。在我们的研究中，我们使用了来自深度撞击实验观测的红外矿物学模型。我们发现尘埃主要由温暖的，细（~1微米）的颗粒，丰富的富镁橄榄石，结晶辉石，无定形硅酸盐，富铁硫化物，无定形碳，和较冷的水冰。温暖的尘埃物质混合物类似于S型组成的内部主带小行星。暖尘埃的有效温度约为440 K，这意味着观测到的物质主要位于距离4.4 L太阳中心源约1.8 AU的狭窄地带，即类地行星形成区和系统的宜居带（相当于太阳系中的0.9 AU）。冰尘分为两个带，分别位于4-9 AU和30 - 80 AU。0.1 ~ 20 μ m，dn/da ~ a^-3.5粒子的暖尘埃质量下限非常大，至少为3 x 10^20 kg，相当于一颗半径为320 km、密度为2.5 g/cm^-3的小行星。假设存在10米大的粒子，温暖尘埃质量的下限至少是0.5 M_火星HD 113766 A周围的尘埃来自于类地行星胚胎的灾难性破坏和随后的碎片研磨，或者来自年轻的碰撞，非常密集的小行星带正在聚集。在过去的二十年里，强烈的红外过剩的持久性，认为一种机制，每年的时间尺度上提供补充的拱星材料。
英文摘要：
We present an analysis of the gas-poor circumstellar material in the HD 113766 binary system (F3/F5, 10 - 16 Myr), recently observed by the Spitzer Space Telescope. For our study we have used the infrared mineralogical model derived from observations of the Deep Impact experiment. We find the dust dominated by warm, fine (~1 um) particles, abundant in Mg-rich olivine, crystalline pyroxenes, amorphous silicates, Fe-rich sulfides, amorphous carbon, and colder water-ice. The warm dust material mix is akin to an inner main belt asteroid of S-type composition. The ~440 K effective temperature of the warm dust implies that the bulk of the observed material is in a narrow belt ~1.8 AU from the 4.4 L_solar central source, in the terrestrial planet-forming region and habitable zone of the system (equivalent to 0.9 AU in the solar system). The icy dust lies in 2 belts, located at 4-9 AU and at 30 - 80 AU. The lower bound of warm dust mass in 0.1 - 20 um, dn/da ~ a^-3.5 particles is very large, at least 3 x 10^20 kg, equivalent to a 320 km radius asteroid of 2.5 g cm^-3 density. Assuming 10m largest particles present, the lower bound of warm dust mass is at least 0.5 M_Mars The dust around HD 113766A originates from catastrophic disruption of terrestrial planet embryo(s) and subsequent grinding of the fragments, or from collisions in a young, extremely dense asteroid belt undergoing aggregation. The persistence of the strong IR excess over the last two decades argues for a mechanism to provide replenishment of the circumstellar material on yearly timescales.
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