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arXiv 1907.04800astro-ph.EP
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在中等分离双星系统中统计上显著缺乏碎片盘

A statistically significant lack of debris discs in medium separation binary systems

Ben Yelverton, Grant M. Kennedy, Kate Y. L. Su, Mark C. Wyatt

摘要:

我们汇编了341个双星和多星系统的样本,目的是寻找和表征柯伊伯带状碎片盘。该样本是通过将以前发表的工作中研究的几个较小的样本与两个未发表的赫歇尔调查的目标相结合来组装的。我们发现,38个系统在70或100 $μ$ m的碎片光盘暗示过量发射。虽然九个光盘似乎是不稳定的扰动从他们的主机二进制基于一个简单的分析,其推断的半径,我们认为,真正的不稳定的证据并不强,主要是因为在真正的光盘半径的不确定性,不稳定区域的边界的不确定性,和轨道投影效应。在$99.4\%$的置信水平上,有盘系统和无盘系统的二元分离分布是不同的,这表明二元分离强烈影响可探测碎片水平的存在。在$\sim$ 25和135 au之间的分离没有检测到圆盘;这可能是双星的结果,其分离与典型的圆盘半径相当,通过动力学扰动清除了它们的原始拱星或拱双星材料。光盘检测率是$19^{+5}_{-3}\%$的双星宽于135 AU,类似于发表的结果为单星。只有$8^{+2}_{-1}\%$的系统与分离低于25金主机可检测的磁盘,这可能表明,星子形成抑制双星接近几十个金,类似的结论,已知的行星托管双星的研究。

英文摘要:

We compile a sample of 341 binary and multiple star systems with the aim of searching for and characterising Kuiper belt-like debris discs. The sample is assembled by combining several smaller samples studied in previously published work with targets from two unpublished Herschel surveys. We find that 38 systems show excess emission at 70 or 100 $μ$m suggestive of a debris disc. While nine of the discs appear to be unstable to perturbations from their host binary based on a simple analysis of their inferred radii, we argue that the evidence for genuine instability is not strong, primarily because of uncertainty in the true disc radii, uncertainty in the boundaries of the unstable regions, and orbital projection effects. The binary separation distributions of the disc-bearing and disc-free systems are different at a confidence level of $99.4\%$, indicating that binary separation strongly influences the presence of detectable levels of debris. No discs are detected for separations between $\sim$25 and 135 au; this is likely a result of binaries whose separations are comparable with typical disc radii clearing out their primordial circumstellar or circumbinary material via dynamical perturbations. The disc detection rate is $19^{+5}_{-3}\%$ for binaries wider than 135 au, similar to published results for single stars. Only $8^{+2}_{-1}\%$ of systems with separations below 25 au host a detectable disc, which may suggest that planetesimal formation is inhibited in binaries closer than a few tens of au, similar to the conclusions of studies of known planet-hosting binaries.

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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