A sensitive survey for 13CO, CN, H2CO, and SO in the disks of T Tauri and Herbig Ae stars

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Table 2

Frequencies of transitions.

Frequency	Molecule and	Detection
(MHz)	transition

206 176.062	SO (5₄ − 4₃)	Yes
209 230.201	HC₃N J = 23–22	No
209 419.15	¹³C¹⁸O J = 2–1	cloud only
211 211.455	ortho H₂CO 3₁₃ − 2₁₂	Yes
220 398.688	¹³CO J = 2–1	Yes
224 714.385	C¹⁷O J = 2–1	Yes
225 697.781	ortho H₂CO 3₁₂ − 2₁₁	Yes
226 287.4185	CN N = 2–1 J = 3/2–3/2, F = 1/2–1/2
226 298.9427	CN N = 2–1 J = 3/2–3/2, F = 1/2–3/2
226 303.0372	CN N = 2–1 J = 3/2–3/2, F = 3/2–1/2
226 314.5400	CN N = 2–1 J = 3/2–3/2, F = 3/2–3/2	Yes
226 332.4986	CN N = 2–1 J = 3/2–3/2, F = 3/2–5/2
226 341.9298	CN N = 2–1 J = 3/2–3/2, F = 5/2–3/2
226 359.8710	CN N = 2–1 J = 3/2–3/2, F = 5/2–5/2	Yes
226 616.5714	CN N = 2–1 J = 3/2–1/2, F = 1/2–3/2	Yes
226 632.1901	CN N = 2–1 J = 3/2–1/2, F = 3/2–3/2	Yes
226 659.5584	CN N = 2–1 J = 3/2–1/2, F = 5/2–3/2	Yes
226 663.6928	CN N = 2–1 J = 3/2–1/2, F = 1/2–1/2	Yes
226 679.3114	CN N = 2–1 J = 3/2–1/2, F = 3/2–1/2	Yes
226 874.1908	CN N = 2–1 J = 5/2–3/2, F = 5/2–3/2	Yes
226 874.7813	CN N = 2–1 J = 5/2–3/2, F = 7/2–5/2	Yes
226 875.8960	CN N = 2–1 J = 5/2–3/2, F = 3/2–1/2	Yes
226 887.4202	CN N = 2–1 J = 5/2–3/2, F = 3/2–3/2	Yes
226 892.1280	CN N = 2–1 J = 5/2–3/2, F = 5/2–5/2	Yes
226 905.3574	CN N = 2–1 J = 5/2–3/2, F = 3/2–5/2
227 191.8195	CN N = 2–1 J = 5/2–1/2, F = 5/2–3/2

Notes. CN N = 2–1 line frequencies were measured in laboratory by Skatrud et al. (1983); we use here the fitted values from the CDMS Database (Müller et al. 2001).

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