MOA-2010-BLG-311: A planetary candidate below the threshold of reliable detection
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We analyze MOA-2010-BLG-311, a high magnification (Amax > 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 ??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.
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Yee, J. and Hung, L. and Bond, I. and Allen, W. and Monard, L. and Albrow, M. and Fouque, P. et al. 2013. MOA-2010-BLG-311: A planetary candidate below the threshold of reliable detection. The Astrophysical Journal. 769.
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