Schematic Diagram of CO Self-Shielding
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Schematic diagram of CO self-shielding at the disk surface due to interstellar radiation normal to the disk and radiation from the central star. The contours indicate decades in gas density. Saturation of C16O absorption lines results in 17O and 18O enhancement at the disk surface (shaded region).
Diagram credit: J. R. Lyons & E. D. Young, 'Photochemical Speciation of Oxygen Isotopes in the Solar Nebula' Published in Chondrites and the Protoplanetary Disk, ASP Conference Series, Vol. 341 (2005), A. Krot, E. Scott, & B. Reipurth, eds. |