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arXiv 1503.03197astro-ph.SRastro-ph.EP
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OGLE-2013-BLG-0578L:由一颗褐矮星和一颗M矮星组成的微透镜双星

OGLE-2013-BLG-0578L: Microlensing Binary Composed of A Brown Dwarf And An M Dwarf

H. Park, A. Udalski, C. Han, R. Poleski, J. Skowron, S. Kozłowski, Ł. Wyrzykowski, M. K. Szymański, P. Pietrukowicz, G. Pietrzyński, I. Soszyński, K. Ulaczyk

摘要:

确定二元微透镜的物理参数是阻碍了由于解决焦散相交的困难,缺乏有关的爱因斯坦角半径的信息。在本文中,我们介绍了二元微透镜事件OGLE-2013-BLG-0578的分析,其中焦散出口提前从实时分析中精确预测,从而能够密集地解决焦散交叉并测量爱因斯坦半径。通过对透镜系统质量的爱因斯坦半径测量,结合透镜视差的附加信息,我们确定该透镜是由一颗晚型M矮星主星和一颗亚星褐矮星伴星组成的双星。该事件表明了当前实时微透镜建模的能力以及微透镜在探测和表征银河系中微弱或黑暗物体方面的有用性。

英文摘要:

Determining physical parameters of binary microlenses is hampered by the lack of information about the angular Einstein radius due to the difficulty of resolving caustic crossings. In this paper, we present the analysis of the binary microlensing event OGLE-2013-BLG-0578, for which the caustic exit was precisely predicted in advance from real-time analysis, enabling to densely resolve the caustic crossing and to measure the Einstein radius. From the mass measurement of the lens system based on the Einstein radius combined with the additional information about the lens parallax, we identify that the lens is a binary that is composed of a late-type M-dwarf primary and a substellar brown-dwarf companion. The event demonstrates the capability of current real-time microlensing modeling and the usefulness of microlensing in detecting and characterizing faint or dark objects in the Galaxy.

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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