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The origin of complex organic molecules such as amino acids and theirprecursors found in meteorites and comets is unknown. Previous studies haveaccounted for the complex organic inventory of the Solar System by aqueouschemistry on warm meteoritic parent bodies, or by accretion of organics formedin the interstellar medium. This paper proposes a third possibility: thatcomplex organics were created in situ by ultraviolet light from nearby O/Bstars irradiating ices already in the Sun's protoplanetary disk. If the Sun wasborn in a dense cluster near UV-bright stars, the flux hitting the disk fromexternal stars could be many orders of magnitude higher than that from the Sunalone. Such photolysis of ices in the laboratory can rapidly produce amino acidprecursors and other complex organic molecules. I present a simple modelcoupling grain growth and UV exposure in a young circumstellar disk. It isshown that the production may be sufficient to create the Solar System's entirecomplex organic inventory within 10^6 years. Subsequent aqueous alteration onmeteoritic parent bodies is not ruled out.

UV photolysis, organic molecules in young disks, and the origin of meteoritic amino acids