MOA-2010-BLG-311: A PLANETARY CANDIDATE BELOW THE THRESHOLD OF RELIABLE DETECTION
Author(s)Polishook, David; Bowens-Rubin, Rachel; Bennett, C. S.
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We analyze MOA-2010-BLG-311, a high magnification (A [subscript 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[superscript 2] ~ 80. The preferred mass ratio between the lens star and its companion is q = 10[superscript –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.
DepartmentMassachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences; Massachusetts Institute of Technology. Department of Physics
The Astrophysical Journal
Yee, J. C., L.-W. Hung, I. A. Bond, W. Allen, L. A. G. Monard, M. D. Albrow, P. Fouque, et al. “MOA-2010-BLG-311: A PLANETARY CANDIDATE BELOW THE THRESHOLD OF RELIABLE DETECTION.” The Astrophysical Journal 769, no. 1 (May 6, 2013): 77. © 2013 The American Astronomical Society
Final published version