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Could you explain again the graph/animation of the microlensing? What is happening at the peaks when the star appears bright?

April 26, 2017animation appears bright explain Graph happening microlensing PEAKS star

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Could you explain again the graph/animation of the microlensing? What is happening at the peaks when the star appears bright?

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The plot on p. 34 of lecture (from this website, which has some additional animations) shows the timeline (note that distinct multiple images can’t be resolved; it’s just the total light that’s measured). The brightness spikes happen when light of the background star is getting lensed by both planet and star.