Molecular composition of comet 46P/Wirtanen from millimetre-wave spectroscopy

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Volume 648 (April 2021)

A&A, 648 (2021) A49

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Table 3

Rotational temperatures and inferred gas kinetic temperatures.

UT	Molecule	Freq. range	Lines	Off. ^(a)	T_rot ^(b)	T_gas
(dd.d)		(GHz)	^(c)	(′′)	(K)	(K)
11.9	CH₃OH	250–254	22	1.7	61.7 ± 4.6	65 ± 5
12.0	CH₃OH	241.8	14	1.7	44.7 ± 2.4	51 ± 4
12.9	CH₃OH	250–254	22	1.6	55.1 ± 3.1	58 ± 3
13.0	CH₃OH	213–230	4	1.0	63 ± 13	56 ± 12
13.1	CH₃OH	165–169	10	1.4	54.2 ± 8.1	55 ± 8
14.9	CH₃OH	250–254	22	3.1	56.8 ± 3.1	60 ± 3
15.0	CH₃OH	241.8	14	1.8	43.1 ± 3.0	48 ± 5
15.8	CH₃OH	250–254	18	2.0	62.1 ± 9.2	66 ± 9
16.0	CH₃OH	165–169	10	1.4	49.4 ± 2.7	50 ± 3
16.9	CH₃OH	250–254	21	1.1	72.5 ± 7.9	77 ± 8
16.9	CH₃OH	165–169	10	2.2	55.0 ± 3.8	56 ± 4
17.0	CH₃OH	213–230	4	0.7	57.6 ± 9.0	51 ± 9
17.1	CH₃OH	165–169	9	1.4	52.7 ± 6.8	54 ± 7
17.1	CH₃OH	241.8	14	2.0	48.3 ± 2.6	56 ± 4
17.8	CH₃OH	250–254	22	1.3	74.0 ± 6.8	79 ± 8
17.9	CH₃OH	241.8	14	1.2	50.0 ± 3.0	57 ± 4
25.8	CH₃OH	165	3	3	43.2 ± 7.4	43 ± 7

≈6-day averages

16.4	CH₃OH	166	10	1.7	53.6 ± 1.8	55 ± 2
			10	3.8	62.6 ± 7.7	64 ± 8
			10	9.5	45.6 ± 4.7	48 ± 5
			10	11.4	70 ± 15	73 ± 15
16.0	CH₃OH	213–234	5	0.9	62.4 ± 5.3	58 ± 5
17.6	CH₃OH	218–239	5	1.7	39.0 ± 6.0	44 ± 7
16.0	CH₃OH	242	14	1.7	47.1 ± 1.3	54 ± 2
			14	9.7	37.3 ± 5.6	49 ± 14
			10	11.5	21.7 ± 4.2	<30
14.1	CH₃OH	252	28	2.1	61.4 ± 1.5	65 ± 2
			22	8.9	63.6 ± 7.4	73 ± 9
			20	11.7	62.7 ± 6.3	76 ± 9
			20	15.9	44.6 ± 7.4	55 ± 11
			18	22.8	60 ± 17	90 ± 40
14.1	CH₃OH	250–267	5	2.1	58.1 ± 2.1	59 ± 2
			5	8.9	52.8 ± 6.8	55 ± 7
16.4	CH₃CN	165.4	5	1.7		60–110
16.0	CH₃CN	257.3	5	1.7	62 ± 15	47–77
16.2	H₂S	169,216	2	2	19.6 ± 0.5	~50
15.0	CH₃ CHO	149–270	68	1–2		52–96

≈6-days averages: day side (based on line Area(v < 0)):

12–18	CH₃ OH	252	28	2.1	57.2 ± 1.9	60 ± 3
12–18	CH₃ OH	165	10	1.7	53.0 ± 2.1	54 ± 2

≈6-days averages: night side (based on line Area(v > 0)):

12–18	CH₃ OH	252	27	2.1	71.0 ± 2.5	75 ± 4
12–18	CH₃ OH	165	10	1.7	52.5 ± 3.0	53 ± 3

Notes. ^(a) Mean pointing offset. ^(b) Result of non-linear fit with χ² minimisation. ^(c) Number of lines used for the determination of T_rot.

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