原始星SDSS J102915 +172927的形成：尘埃质量和粒度分布的影响
The formation of the primitive star SDSS J102915+172927: effect of the dust mass and the grain-size distribution
摘要：
了解极贫金属恒星SDSS-J102915+172927的形成对于提高我们对宇宙中第一代和第二代恒星之间过渡的认识至关重要。在本文中，我们进行三维宇宙学流体动力学模拟的尘埃富集晕在早期阶段的崩溃过程，包括详细的治疗的尘埃物理。我们采用天体化学软件包\krome加上流体动力学代码\textsc{enzo}假设的颗粒大小分布产生的核心坍缩超新星爆炸的20和35 M $_\odot$原始恒星，适合复制的化学图案的SDSS-J102915+172927星。我们发现第三星族超新星爆发产生的尘埃质量产额是驱动热演化和晕动力学性质的最重要因素。因此，对于在这种情况下相关的特定分布，由于类似的冷却功能，组合物，尘埃光学性质和尺寸范围对结果只有很小的影响。我们还表明，临界尘埃质量，使半解析模型提供的碎片应进行修订，因为我们得到的值大一个数量级。这决定了从盘碎片化到一个更有意义的碎片化模式的转变，并表明可能不止一个超新星事件或有效的尘埃生长应该被调用来获得如此高的尘埃含量。
英文摘要：
Understanding the formation of the extremely metal poor star SDSS-J102915+172927 is of fundamental importance to improve our knowledge on the transition between the first and second generation of stars in the Universe. In this paper, we perform three-dimensional cosmological hydrodynamical simulations of dust-enriched halos during the early stages of the collapse process including a detailed treatment of the dust physics. We employ the astrochemistry package \krome coupled with the hydrodynamical code \textsc{enzo} assuming grain size distributions produced by the explosion of core-collapse supernovae of 20 and 35 M$_\odot$ primordial stars which are suitable to reproduce the chemical pattern of the SDSS-J102915+172927 star. We find that the dust mass yield produced from Population III supernovae explosions is the most important factor which drives the thermal evolution and the dynamical properties of the halos. Hence, for the specific distributions relevant in this context, the composition, the dust optical properties, and the size-range have only minor effects on the results due to similar cooling functions. We also show that the critical dust mass to enable fragmentation provided by semi-analytical models should be revised, as we obtain values one order of magnitude larger. This determines the transition from disk fragmentation to a more filamentary fragmentation mode, and suggests that likely more than one single supernova event or efficient dust growth should be invoked to get such a high dust content.
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