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arXiv 0710.0207astro-ph
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中等分离的双星不会影响行星形成的第一步

Medium-separation binaries do not affect the first steps of planet formation

I. Pascucci, D. Apai, E. E. Hardegree-Ullman, J. S. Kim, M. R. Meyer, J. Bouwman

摘要:

行星形成的第一步是亚微米大小的尘埃颗粒的生长和结晶,伴随着尘埃沉降到磁盘中平面。在这篇论文中,我们探讨了行星形成的第一步是否受到中等分离恒星同伴存在的影响。我们选择了两个大样本的磁盘周围的金牛座的单和双金牛座T星,被认为只有一个温和的年龄传播的几个百万年。我们的双星样本的同伴在10和450 AU之间的投影分离,质量下降到约0.1太阳质量。我们使用10微米硅酸盐发射特征的强度和形状分别作为晶粒生长和结晶的代表。尘埃沉降的程度从两个不同的中红外波长的通量的比率进行评估。我们发现,从单一和二元系统的10微米硅酸盐发射功能的分布之间没有统计学上的显着差异。此外,盘耀斑的分布是无法区分的单,二元系统的样品。这些结果表明,行星形成的第一步不会受到数十天文单位的伴星的影响。

英文摘要:

The first steps of planet formation are marked by the growth and crystallization of sub-micrometer-sized dust grains accompanied by dust settling toward the disk midplane. In this paper we explore whether the first steps of planet formation are affected by the presence of medium-separation stellar companions. We selected two large samples of disks around single and binary T Tauri stars in Taurus that are thought to have only a modest age spread of a few Myr. The companions of our binary sample are at projected separations between 10 and 450 AU with masses down to about 0.1 solar masses. We used the strength and shape of the 10 micron silicate emission feature as a proxy for grain growth and for crystallization respectively. The degree of dust settling was evaluated from the ratio of fluxes at two different mid-infrared wavelengths. We find no statistically significant difference between the distribution of 10 micron silicate emission features from single and binary systems. In addition, the distribution of disk flaring is indistinguishable between the single and binary system samples. These results show that the first steps of planet formation are not affected by the presence of a companion at tens of AU.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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