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Table 1

Presence of molecular emission in the spectra.

Group XUE Sp. type M ⋆ [M⊙] FUV [log G0] CO H2Oh (a) H2Ow (b) HCN C2H2 OH CO2 13CO2 CH3+$\[\mathrm{CH}_{3}^{+}\]$ PAHs
I 3 F3V 2.7 5.04 × × × × × × × × × ×
(inn. hole) 5 K1V 2.6 5.82 × × × × × × × × × ×
I 1 G9V 1.2 5.19 ✓ ✓ ✓ ✓ ✓ ✓ ✓ × × ×
(flare/gap) 10 F0V 2.8 3.71 ✓ ✓? × × × × ✓ ✓ ✓ ✓(*) × ✓
GI Fraction 2/4 [1–2]/4 1/4 1/4 1/4 1/4 2/4 1/4 0/4 1/4
II (self-shadowed) 2 K2V 2.9 5.29 ✓ ✓? × ✓? × ✓? ✓? × ✓? ×
4 G4V 3.6 4.00 × × × × × × × × × ×
6 G6V 3.5 4.67 ✓? ✓ × ✓ ✓ × ✓ × × ×
7 G8V 3.4 4.05 ✓ ✓ × ✓? ✓? ✓? ✓ × × ×
8 G6V 3.5 3.37 ✓ ✓ ✓ ✓ ✓ ✓ ✓? ✓ ✓ ✓? × ×
9 G7V 3.5 4.39 × ✓? × × × × × × × ×
11 G9V 3.0 3.57 × ✓ × ✓ × × × × × ×
12 G8V 3.2 3.30 ✓ ✓ ✓ ✓ ✓? ✓ ✓ ✓? × ×
GII Fraction [4–5]/8 [5–7]/8 2/8 [4–6]/8 [1–4]/8 [2–4]/8 [4–5]/8 [0–2]/8 [0–1]/8 0/8
Total Fraction [6–7]/12 [6–9]/12 3/12 [5–7]/12 [2–5]/12 [3–5]/12 [6–7]/12 [1–3]/12 [0–1]/12 1/12

Notes. The double check marks indicate a strong detection. The last row below each category shows the fraction of sources that present each molecule in their spectrum. In some cases, it is not possible to confirm or reject the presence of a certain molecule in the spectrum; in such cases, the fraction of sources is indicated in square brackets, with the numerator indicating a range of sources that might contain the molecule. (a) Water component at ~900 K. (b) Water component at ~400 K. (*) Also presents 16OC17O and 16OC18O.

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