用Keck干涉仪排除伴星和分辨过渡带的最内层
Ruling out Stellar Companions and Resolving the Innermost Regions of Transitional Disks with the Keck Interferometer
摘要：
与凯克干涉仪，我们已经研究了在2微米的几个附近的，年轻的，灰尘耗尽的“过渡”磁盘的最内层区域。我们的观测目标是金牛座/御夫座恒星形成区六个最清晰的过渡盘中的五个（DM Tau，GM Aur，LkCa 15，UX Tau A和RY Tau），以探索内部盘光学厚尘埃的耗尽是由恒星伴星引起的可能性，而不是更典型的行星形成假说。在99.7%的置信水平下，观测到的双星不包括通量比至少为0.05，分离范围为2.5至30质量（0.35 - 4 AU）的双星，超过我们测量覆盖面积的94%。除了DM Tau外，所有目标的SED都超过了我们的同伴通量比检测极限。虽然先前在候选过渡盘系统CoKu Tau/4中检测到了伴星，但我们可以排除类似质量的伴星作为过渡盘中清除内部尘埃和近红外过量发射的典型起源。与CoKu Tau/4不同，我们所有的目标都显示出一些吸积的证据。我们发现，所有的目标，但一个是明确的空间分辨率，和UX Tau A是勉强解决。我们的数据与小尺度（0.1 AU）内的热物质一致，并与较冷的外盘分离，与最近的SED建模一致。这些观测结果支持了这样一种观点，即一些过渡盘在其光学厚度的材料中具有径向间隙，这可能是原行星盘的宜居带（~几个天文单位）中行星形成的指示。
英文摘要：
With the Keck Interferometer, we have studied at 2 um the innermost regions of several nearby, young, dust depleted "transitional" disks. Our observations target five of the six clearest cases of transitional disks in the Taurus/Auriga star-forming region (DM Tau, GM Aur, LkCa 15, UX Tau A, and RY Tau) to explore the possibility that the depletion of optically thick dust from the inner disks is caused by stellar companions rather than the more typical planet-formation hypothesis. At the 99.7% confidence level, the observed visibilities exclude binaries with flux ratios of at least 0.05 and separations ranging from 2.5 to 30 mas (0.35 - 4 AU) over >= 94% of the area covered by our measurements. All targets but DM Tau show near-infrared excess in their SED higher than our companion flux ratio detection limits. While a companion has previously been detected in the candidate transitional disk system CoKu Tau/4, we can exclude similar mass companions as the typical origin for the clearing of inner dust in transitional disks and of the near-infrared excess emission. Unlike CoKu Tau/4, all our targets show some evidence of accretion. We find that all but one of the targets are clearly spatially resolved, and UX Tau A is marginally resolved. Our data is consistent with hot material on small scales (0.1 AU) inside of and separated from the cooler outer disk, consistent with the recent SED modeling. These observations support the notion that some transitional disks have radial gaps in their optically thick material, which could be an indication for planet formation in the habitable zone (~ a few AU) of a protoplanetary 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。
