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Home All issues Volume 704 (December 2025) A&A, 704 (2025) A18 Full HTML
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Table 2

Molecular lines identified in our ALMA observations of W Hya in Band 6.

# Species Transition Rest frequency (GHz) Eu/k (K) log Aul (s−1)
1 29SiO v = 3, J = 6–5 251.930123 5265.98 −3.067
2 30SiO * v = 2, J = 6–5 250.727751 3521.00 −3.079
3 29SiO * v = 2, J = 6–5 253.703469 3541.92 −3.064
4 30SiO v = 1, J = 6–5 252.471372 1790.18 −3.076
5 Si17O * v = 0, J = 6–5 250.744695 42.12 −3.090
6 H2O * v2 = 2, 65,2−74,3 268.149117 6039.00 −4.820
7 H2O v2 = 2, 92,8−83,5 250.751793 6141.05 −5.046
8 SO2 v = 0,3610,26−379,29 250.816786 857.17 −4.472
9 SO2 * v = 0,324,28−315,27 252.563893 531.10 −4.384
10 SO2 * v = 0,309,21−318,24 266.943325 625.92 −4.408
11 SO2 * v = 0,475,43−466,40 267.428332 1103.31 −4.530
12 SO2 v = 0,133,11−132,12 267.537451 105.82 −3.820
13 SO2 v = 0,284,24−283,25 267.719840 415.88 −3.666
14 SO2 v = 0,636,58−627,55 267.192971 1950.02 −4.799
15 SO2 v = 0,385,33−376,32 253.935883 749.09 −4.395
16 SO2 * v = 0,213,19−220,22 253.753448 234.70 −5.788
17 SO2 * v2 = 2, 131,13−120,12 251.738875 1571.41 −3.760
18 SO2 * v2 = 1, 304,26−303,27 266.030566 1240.54 −3.632
19 SO2 v2 = 1, 303,27−302,28 266.815526 1227.53 −3.682
20 SO2 * v2 = 1, 113,9−112,10 268.169791 844.26 −3.812
21 SO2 * v1 = 1, 284,24−283,25 268.617160 2071.15 −3.662
22 SO2 v = 0,6710,58−6611,55 267.334780 2345.14 −4.329
23 SO2 v = 0,6616,50−6715,53 267.356251 2655.42 −4.366
24 SO2 * v1 = 1, 105,5−114,8 250.545521 1768.80 −4.647
25 SO2* v1 = 1, 83,5−82,6 251.650159 1712.13 −3.917
26 SO2 v1 = 1, 133,11−132,12 267.803703 1762.51 −3.817
27 SO2 * v2 = 1, 455,41−446,38 252.408567 1763.60 −4.500
28 SO2 * v2 = 1, 156,10−165,11 267.006774 963.79 −4.470
29 SO2 v2 = 1, 319,23−328,24 267.091925 1430.70 −4.372
30 SO2 * v3 = 1, 143,12−142,13 268.242240 2077.83 −3.804
31 SO2 v2 = 2, 33,1−32,2 268.024200 1517.97 −4.124
32 SO2 v2 = 2, 43,1−42,2 267.619458 1521.64 −3.980
33 SO2 v3 = 1, 466,41−457,38 251.851027 3042.64 −4.420
34 SO2 * v3 = 1, 63,4−62,5 253.654459 2000.78 −3.937
35 SO2 v3 = 1, 146,9−155,10 268.035143 2143.16 −4.494
36 34SO2 v = 0,324,28−323,29 251.758329 530.31 −3.709
37 34SO2 v = 0,153,13−152,14 267.871060 131.76 −3.821
38 34SO2 v = 0,95,5−104,6 252.615371 100.51 −4.700
39 34SO2 v = 0,113,9−112,10 253.936316 82.05 −3.893
40 33SO2 v = 0,53,3−52,4 251.702816 36.00 −4.028
41 SO v = 0, NJ = 65−54 251.825770 50.66 −3.716
42 SO v = 0, NJ = 43−34 267.197746 28.68 −6.148
43 AlO * N = 7–6 267.938239 51.44 −2.687
44 AlOH J = 8–7 251.794759 54.38 −4.024
45 HCN v = 0, J = 3–2 265.886434 25.52 −3.077
46 HCN v2 = 11e, J = 3–2 265.852709 1049.89 −3.142
47 HCN v2 = 11f, J = 3–2 267.199283 1050.02 −3.135
48 TiO v = 1, 3Δ1, J = 8–7 251.802917 1491.68 −3.018
49 50TiO v = 0, 3Δ2, J = 8–7 253.591920 192.22 −3.030
50 49TiO v = 0, 3Δ1, J = 8–7 251.957928 52.92 −3.077
51 TiO2 86,2−85,3 251.866957 65.77 −2.940
52 TiO2 76,2−75,3 251.977193 59.95 −3.041
53 TiO2 263,23−262,24 250.939052 272.67 −2.825
54 TiO2 96,4−95,5 251.708056 72.31 −2.881
55 TiO2 242,22−241,23 265.770503 224.99 −2.894
56 OH v = 0, NJ = 1835/2, F = 18+−18− 265.734659 8859.61 −5.859
57 OH v = 0, NJ = 1835/2, F = 17+−17− 265.765323 8859.61 −5.859

Notes. The lines marked with an asterisk (*) show emission excess on top of the continuum over the stellar disk.

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