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arXiv 1104.2245astro-ph.SR
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GG Tau A的轨道

The Orbit of GG Tau A

Rainer Köhler

摘要:

本文研究了前主序星双星系统GG Tau A的轨道及其与环双星盘的关系,以解释环双星盘的尖锐内缘。在VLT上用NACO获得了该双星的三个新的相对天体测量位置。我们将这些与文献中的数据相结合,并将轨道模型拟合到数据集。我们发现,一个轨道与磁盘共面和兼容的天体测量数据是太小,以解释磁盘的内部间隙。另一方面,大到足以导致间隙的轨道相对于盘倾斜。如果盘间隙确实是由伴星造成的,那么最可能的解释是低估了天体测量误差和盘平面与轨道之间的不对准。

英文摘要:

We present a study of the orbit of the pre-main-sequence binary system GG Tau A and its relation to its circumbinary disk, in order to find an explanation for the sharp inner edge of the disk. Three new relative astrometric positions of the binary were obtained with NACO at the VLT. We combine these with data from the literature and fit orbit models to the dataset. We find that an orbit coplanar with the disk and compatible with the astrometric data is too small to explain the inner gap of the disk. On the other hand, orbits large enough to cause the gap are tilted with respect to the disk. If the disk gap is indeed caused by the stellar companion, then the most likely explanation is a combination of underestimated astrometric errors and a misalignment between the planes of the disk and the orbit.

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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