arXiv 1209.54332012-09-24astro-ph.GA

上天蝎座星盘

The Disk Population of the Upper Scorpius Association

K. L. Luhman, E. E. Mamajek

备注：: machine readable version of Table 1 available at http://iopscience.iop.org/0004-637X/758/1/31
发表信息：: Astrophys.J.758(2012)31
DOI：: 10.1088/0004-637X/758/1/31

摘要：

基于斯皮策太空望远镜和宽视场红外巡天探测器获得的这些天体的所有图像，我们提出了上天蝎座星协（~ 1100万年）所有已知成员在3- 24微米的测光。我们已经使用这些数据来确定的成员，表现出过量的排放，从拱盘和估计这些磁盘的演化阶段。通过这种分析，我们已经发现了约50个新的过渡，进化和碎片盘的候选者。对于B-G型恒星（M>1.2 Msun），包含内部原始盘的成员比例<10%，并且随着后面类型的增加，在>=M5（M<=0.2 Msun）时增加到~25%，这与以前对更小样本的Upper Sco成员的盘调查结果一致。这些数据表明，在较低的恒星质量下，盘的寿命更长，并且很大一部分低质量恒星的盘至少存活了约1000万年。最后，我们证明了在上天蝎座和更年轻的金牛座恒星形成区（~ 100万年）的多余尺寸的分布是一致的，相同的，简短的时间尺度为清除内部磁盘。

英文摘要：

We present photometry at 3-24um for all known members of the Upper Scorpius association (~11 Myr) based on all images of these objects obtained with the Spitzer Space Telescope and the Wide-field Infrared Survey Explorer. We have used these data to identify the members that exhibit excess emission from circumstellar disks and estimate the evolutionary stages of these disks. Through this analysis, we have found ~50 new candidates for transitional, evolved, and debris disks. The fraction of members harboring inner primordial disks is <10% for B--G stars (M>1.2 Msun) and increases with later types to a value of ~25% at >=M5 (M<=0.2 Msun), in agreement with the results of previous disk surveys of smaller samples of Upper Sco members. These data indicate that the lifetimes of disks are longer at lower stellar masses, and that a significant fraction of disks of low-mass stars survive for at least ~10 Myr. Finally, we demonstrate that the distribution of excess sizes in Upper Sco and the much younger Taurus star-forming region (~1 Myr) are consistent with the same, brief timescale for clearing of inner disks.

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