A statistically significant lack of debris discs in medium separation binary systems
A statistically significant lack of debris discs in medium separation binary systems
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DOI：
10.1093/mnras/stz1927
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发表时间：
2019-07
影响因子：
4.8
通讯作者：
B. Yelverton;G. Kennedy;K. Su;M. Wyatt
中科院分区：
文献类型：
--
作者：
B. Yelverton;G. Kennedy;K. Su;M. Wyatt
我们汇编了一个由341个双星和多恒星系统组成的样本，目的是寻找和表征柯伊伯带状碎片盘。样本是通过将先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组合在一起的。我们发现，38个系统在70或100美元/亩处表现出超额排放，这表明这是一个碎片盘。虽然根据对其推断半径的简单分析，其中九个盘似乎对其宿主双星的扰动不稳定，但我们认为，真正不稳定的证据并不强烈，主要是因为真实盘半径的不确定性，不稳定区域边界的不确定性，以及轨道投影效应。在$99.4的置信度水平下，有盘系统和无盘系统的二元分离分布是不同的，这表明二元分离强烈影响可检测到的碎片水平的存在。在∼25和135Au之间没有探测到分离的圆盘；这很可能是因为双星的分离与典型的圆盘半径相当，通过动力学扰动清除了它们的原始星周或外双星物质。对于大于135Au的双星，圆盘探测率为19^{+5}_{-3}{{\\rm%\cent}}$，与已发表的单星结果相似。只有$8^{+2}_{-1}{${+2}_{-1}{\\rm%}$存在一个可探测到的盘，这可能表明，在距离几十个Au更近的双星中，小行星的形成受到了抑制，这与已知的拥有行星的双星的研究结论类似。
We compile a sample of 341 binary and multiple star systems with the aim of searching for and characterizing 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The sample is assembled by combining several smaller samples studied in previously published work with targets from two unpublished Herschel surveys.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 $\mu$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 $99.4{{\ \rm per\ cent}}$, indicating that binary separation strongly influences the presence of detectable levels of debris. No discs are detected for separations between ∼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 $19^{+5}_{-3}{{\ \rm per\ cent}}$ for binaries wider than 135 au, similar to the published results for single stars. Only $8^{+2}_{-1}{{\ \rm per\ cent}}$ 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.