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arXiv 1111.5618astro-ph.SRastro-ph.EP
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碎片盘星中的双星

Binaries Among Debris Disk Stars

David R. Rodriguez, B. Zuckerman

摘要:

我们已经收集了112颗具有已知碎片盘的主序星的样本。我们收集了已发表的信息,并在利克天文台进行了自适应光学观测,以确定这些碎片盘是否与双星或多星有关。我们发现了HD 1051的一个以前未知的M星伴星,预计距离为628 AU。我们发现25+/-4%的碎片盘系统是双星或三星系统,大大低于预期的50%。这些的周期分布表明相对缺乏1-100 AU分离的系统。只有少数系统的黑体盘半径可与二元/三元分离相媲美。这两个特征一起表明,中间分离度为1-100 AU的双星很容易清除它们的盘。我们发现,分数盘光度,作为磁盘质量的代理,一般是低的多个系统比单星在任何给定的年龄。因此,对于一个拥有盘(或形成行星)的双星来说,它必须是一个非常分离的双星,盘粒子绕着一颗恒星旋转,或者它必须是一个小的分离双星,有一个环双星盘。

英文摘要:

We have gathered a sample of 112 main-sequence stars with known debris disks. We collected published information and performed adaptive optics observations at Lick Observatory to determine if these debris disks are associated with binary or multiple stars. We discovered a previously unknown M-star companion to HD 1051 at a projected separation of 628 AU. We found that 25+/-4% of our debris disk systems are binary or triple star systems, substantially less than the expected ~50%. The period distribution for these suggests a relative lack of systems with 1-100 AU separations. Only a few systems have blackbody disk radii comparable to the binary/triple separation. Together, these two characteristics suggest that binaries with intermediate separations of 1-100 AU readily clear out their disks. We find that the fractional disk luminosity, as a proxy for disk mass, is generally lower for multiple systems than for single stars at any given age. Hence, for a binary to possess a disk (or form planets) it must either be a very widely separated binary with disk particles orbiting a single star or it must be a small separation binary with a circumbinary disk.

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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