We present the analysis of the light curves of 9 high-magnification single-lens gravitational microlensing events with lenses passing over source stars , including OGLE-2004-BLG-254 , MOA-2007-BLG-176 , MOA-2007-BLG-233/OGLE-2007-BLG-302 , MOA-2009-BLG-174 , MOA-2010-BLG-436 , MOA-2011-BLG-093 , MOA-2011-BLG-274 , OGLE-2011-BLG-0990/MOA-2011-BLG-300 , and OGLE-2011-BLG-1101/MOA-2011-BLG-325 .
For all events , we measure the linear limb-darkening coefficients of the surface brightness profile of source stars by measuring the deviation of the light curves near the peak affected by the finite-source effect .
For 7 events , we measure the Einstein radii and the lens-source relative proper motions .
Among them , 5 events are found to have Einstein radii less than 0.2 mas , making the lenses candidates of very low-mass stars or brown dwarfs .
For MOA-2011-BLG-274 , especially , the small Einstein radius of \theta _ { E } \sim 0.08 mas combined with the short time scale of t _ { E } \sim 2.7 days suggests the possibility that the lens is a free-floating planet .
For MOA-2009-BLG-174 , we measure the lens parallax and thus uniquely determine the physical parameters of the lens .
We also find that the measured lens mass of \sim 0.84 M _ { \odot } is consistent with that of a star blended with the source , suggesting that the blend is likely to be the lens .
Although we find planetary signals for none of events , we provide exclusion diagrams showing the confidence levels excluding the existence of a planet as a function of the separation and mass ratio .