标题： OGLE-2007-BLG-224L：地表视差的确认 显示英文标题

标题： OGLE-2007-BLG-224L: Confirmation of Terrestrial Parallax

摘要： 我们根据在微透镜事件发生七年后的MagAO成像，给出了OGLE-2007-BLG-224透镜通量的限制。 在观测时，透镜应已与微透镜源分离292毫角秒。 然而，未用MagAO检测到新光源。 我们将透镜通量的上限定为$H>20.57$。 这一测量支持Gould等人(2009)的结论，即该事件中的透镜应为棕矮星。 这是对基于地表微透镜视差效应的预测的首次测试，也是对亚恒星/暗微透镜的首次自适应光学确认。 显示英文摘要

摘要： We present limits on the lens flux of OGLE-2007-BLG-224 based on MagAO imaging taken seven years after the microlensing event. At the time of the observations, the lens should have been separated from the microlensing source by 292 mas. However, no new sources are detected with MagAO. We place an upper limit on the lens flux of $H>20.57$. This measurement supports the conclusion of Gould et al. (2009) that the lens in this event should be a brown dwarf. This is the first test of a prediction based on the terrestrial microlens parallax effect and the first AO confirmation of a sub-stellar/dark microlens.