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The organic content of protoplanetary disks sets the initial compositions ofplanets and comets, thereby influencing subsequent chemistry that is possiblein nascent planetary systems. We present observations of the complexnitrile-bearing species CH3CN and HC3N towards the disks around the T Tauristars AS 209, IM Lup, LkCa 15, and V4046 Sgr as well as the Herbig Ae stars MWC480 and HD 163296. HC3N is detected towards all disks except IM Lup, and CH3CNis detected towards V4046 Sgr, MWC 480, and HD 163296. Rotational temperaturesderived for disks with multiple detected lines range from 29-73K, indicatingemission from the temperate molecular layer of the disk. V4046 Sgr and MWC 480radial abundance profiles are constrained using a parametric model; thegas-phase CH3CN and HC3N abundances with respect to HCN are a few to tens ofpercent in the inner 100 AU of the disk, signifying a rich nitrile chemistry atplanet- and comet-forming disk radii. We find consistent relative abundances ofCH3CN, HC3N, and HCN between our disk sample, protostellar envelopes, and solarsystem comets; this is suggestive of a robust nitrile chemistry with similaroutcomes under a wide range of physical conditions.

A Survey of CH3CN and HC3N in Protoplanetary Disks