Evolution of the CO gas phase abundance ϵ(CO) in the post-burst phase. The 2D contour plots show ϵ(CO) for five different times of t = 10, 1000, 3000, 104 and 105 yr after the end of the burst. The white solid and dashed contours indicate ϵ(CO) = 10-5 and ϵ(CO) = 10-6, respectively. The 1000 and 3000 yr panels include a zoom in for the inner 300 au (marked by the grey box). The bottom right panel shows the evolution of the vertically averaged CO abundance as a function of the midplane radius (the dashed lines are for t = 300 and t = 3 × 104 yr). The vertical grey dashed line marks the radial disk to envelope transition at r ≈ 150 au. The black solid line corresponds to the quiescent phase (t = 105 yr).
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