American Astronomical Society, Astrophysical Journal, 1(769), p. 77, 2013
DOI: 10.1088/0004-637x/769/1/77
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We analyze MOA-2010-BLG-311, a high magnification (A max > 600) microlensing event with complete data coverage over the peak, making it very sensitive to planetary signals. We fit this event with both a point lens and a two-body lens model and find that the two-body lens model is a better fit but with only Δχ 2 ~ 80. The preferred mass ratio between the lens star and its companion is q = 10 -3.7 ± 0.1 , placing the candidate companion in the planetary regime. Despite the formal significance of the planet, we show that because of systematics in the data the evidence for a planetary companion to the lens is too tenuous to claim a secure detection. When combined with analyses of other high-magnification events, this event helps empirically define the threshold for reliable planet detection in high-magnification events, which remains an open question. ; DOI: 10.1088/0004-637X/769/1/77; eprintid: arXiv:1210.6041