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We present the first high-resolution, ground-based observations of HCN andC2H2 toward the T Tauri binary star system GV Tau. We detected strongabsorption due to HCN nu_3 and weak C2H2 (nu_3 and nu_2 + (nu_4 + nu_5)^0_+)absorption toward the primary (GV Tau S) but not the infrared companion. Wealso report CO column densities and rotational temperatures, and presentabundances relative to CO of HCN/CO ~0.6% and C2H2/CO ~1.2% and an upper limitfor CH4/CO < 0.37% toward GV Tau S. Neither HCN nor C2H2 were detected towardthe infrared companion and results suggest that abundances may differ betweenthe two sources.

Warm HCN, C2H2, and CO in the disk of GV Tau