Discovery of 1H-cyclopent[cd]indene (c-C11H8) in TMC-1 with the QUIJOTE line survey: A new three-ringed polycyclic aromatic hydrocarbon

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Volume 706 (February 2026)

A&A, 706 (2026) L10

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Table B.1.

Observed line parameters for cyclopentindene.

Transition	ν_obs^a	∣ν_obs−calc∣	∫ T_A^* dv ^b	Δv^c	T_A^*^d
	MHz	MHz	mK km s⁻¹	km s⁻¹	mK

17_2, 15-16_2, 14	31966.982±0.010	0.004	0.29±0.09	0.85±0.27	0.32±0.10
17_3, 15-16_2, 14
17_2, 15-16_3, 14
17_3, 15-16_3, 14

18_1, 17-17_1, 16	31983.619±0.012	0.001	0.28±0.09	0.55±0.21	0.47±0.10
18_2, 17-17_1, 16
18_1, 17-17_2, 16
18_2, 17-17_2, 16

19_0, 19-18_0, 18	32001.202±0.010	< 0.001	0.52±0.07	0.73±0.12	0.68±0.10
19_1, 19-18_0, 18
19_0, 19-18_1, 18
19_1, 19-18_1, 18

16_4, 12-15_4, 11	33585.632±0.010	0.003	0.33±0.06	0.87±0.17	0.36±0.08
16_5, 12-15_4, 11
16_4, 12-15_5, 11
16_5, 12-15_5, 11

17_3, 14-16_3, 13	33593.799± 0.010	0.003	0.39±0.08	0.64± 0.13	0.57±0.10
17_4, 14-16_3, 13
17_3, 14-16_4, 13
17_4, 14-16_4, 13
18_2, 16-17_2, 15	33608.290±0.010	0.011	0.36±0.07	0.74±0.16	0.45±0.08
18_3, 16-17_2, 15
18_2, 16-17_3, 15
18_3, 16-17_3, 15

19_1, 18-18_1, 17^e	33625.111±0.010	0.002	0.32±0.08	0.72±0.25	0.41±0.12
19_2, 18-18_1, 17
19_1, 18-18_2, 17
19_2, 18-18_2, 17

20_0, 20-19_0, 19	33642.731±0.010	0.003	0.41±0.09	0.73±0.19	0.53±0.10
20_1, 20-19_0, 19
20_0, 20-19_1, 19
20_1, 20-19_1, 19

18_3, 15-17_3, 14	35234.645±0.010	0.001	0.20±0.06	0.61±0.20	0.30±0.09
18_4, 15-17_3, 14
18_3, 15-17_4, 14
18_4, 15-17_4, 14

19_2, 17-18_2, 16	35249.661± 0.010	0.010	0.41±0.06	0.63± 0.10	0.60±0.10
19_3, 17-18_2, 16
19_2, 17-18_3, 16
19_3, 17-18_3, 16

20_1, 19-19_1, 18	35266.615±0.010	0.006	0.40±0.08	0.76±0.18	0.49±0.09
20_2, 19-19_1, 18
20_1, 19-19_2, 18
20_2, 19-19_2, 18

21_0, 21-20_0, 20	35284.252±0.010	< 0.001	0.33±0.05	0.50±0.10	0.62±0.09
21_1, 21-20_0, 20
21_0, 21-20_1, 20
21_1, 21-20_1, 20

17_5, 12-16_5, 11	36863.401± 0.012	0.006	0.48±0.11	1.12± 0.32	0.40±0.10
17_6, 12-16_5, 11
17_5, 12-16_6, 11
17_6, 12-16_6, 11

18_4, 14-17_4, 13	36864.275± 0.010	0.004	0.21±0.04	0.33± 0.25	0.59±0.10
18_5, 14-17_4, 13
18_4, 14-17_5, 13
18_5, 14-17_5, 13

19_3, 16-18_3, 15^e	36875.615±0.010	0.008	0.39±0.08	0.69±0.14	0.53±0.10
19_4, 16-18_3, 15
19_3, 16-18_4, 15
19_4, 16-18_4, 15

22_0, 22-21_0, 21	36925.765 ±0.010	0.009	0.27±0.08	0.60±0.14	0.43±0.11
22_1, 22-21_0, 21
22_0, 22-21_1, 21
22_1, 22-21_1, 21

19_4, 15-18_4, 14	38504.336± 0.017	0.009	0.50±0.13	1.02± 0.30	0.46±0.12
19_5, 15-18_4, 14
19_4, 15-18_5, 14
19_5, 15-18_5, 14

20_3, 17-19_3, 16	38516.697± 0.010	0.005	0.32±0.07	0.65± 0.16	0.47±0.08
20_4, 17-19_3, 16
20_3, 17-19_4, 16
20_4, 17-19_4, 16

21_2, 19-20_2, 18	38532.453±0.010	0.001	0.28±0.05	0.59±0.11	0.46±0.08
21_3, 19-20_2, 18
21_2, 19-20_3, 18
21_3, 19-20_3, 18

23_0, 23-22_0, 22	38567.293±0.010	0.002	0.36±0.07	0.64±0.13	0.52±0.09
23_1, 23-22_0, 22
23_0, 23-22_1, 22
23_1, 23-22_1, 22

23_1, 22-22_1, 21	40191.115± 0.012	0.009	0.20±0.05	0.56± 0.19	0.33±0.09
23_2, 22-22_1, 21
23_1, 22-22_2, 21
23_2, 22-22_2, 21

24_0, 24-23_0, 23	40208.816±0.023	0.004	0.30±0.19	0.56±0.45	0.51±0.14
24_1, 24-23_0, 23
24_0, 24-23_1, 23
24_1, 24-23_1, 23

Notes.

^(a)

Adopted rest frequency (see text).

^(b)

Integrated line intensity in mK km s⁻¹.

^(c)

Line width at half intensity derived by fitting a Gaussian function to the observed line profile (in km s⁻¹).

^(d)

Antenna temperature in millikelvin.

^(e)

We obtained the line parameters using only the 8 MHz frequency switching data.

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