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		| Paper: | The Role of Opacities in Calculating the Structure and Evolution of Protoplanetary Disks |  
		| Volume: | 515, Workshop on Astrophysical Opacities |  
		| Page: | 231 |  
		| Authors: | Calvet, N. |  
		| Abstract: | The most important heating agent of protoplanetary disks is absorption of radiation arising in the very active stellar atmosphere and in the accretion flows onto the star. Here, I give a brief review of the opacity mechanisms important in disks and of their current treatment. |  
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