Molecular investigations of comets C/2002 X5 (Kudo-Fujikawa), C/2002 V1 (NEAT), and C/2006 P1 (McNaught) at small heliocentric distances

N. Biver; D. Bockelée-Morvan; P. Colom; J. Crovisier; G. Paubert; A. Weiss; H. Wiesemeyer

doi:10.1051/0004-6361/201016250

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Volume 528 (April 2011)

A&A, 528 (2011) A142

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Table 6

Gas temperature measurements.

UT date	⟨ r_h ⟩	Offset	Lines	Rotational temperature	Gas temperature
[mm/dd.dd]	[AU]	[″]		[K]	[K]

C/2002 X5 (Kudo-Fujikawa): (2003)
01/13.61	0.553	3.5	CH₃OH 157 GHz	38 ± 10	30 ± 10
01/26.54	0.213	3.0	CH₃OH 157 GHz
01/26.54	0.213	1.6	CH₃CN 147 GHz		> 190
01/26.54	0.213	1.0	HCNJ(3–2), v₂ = 1/v₂ = 0	< 245	< 530¹
03/12.72	1.184	3.0	CH₃OH 157 GHz

C/2002 V1 (NEAT): (2003)
02/17.0	0.120	1.9	HCNJ(3–2), v₂ = 1/v₂ = 0	< 285	< 574¹
02/17.25	0.116	1.6	CH₃OH 252 GHz
02/17.3	0.110	1.6	CH₃OH 252 GHz+20₃A⁺⁻
02/17.6	0.108	1.8	HCNJ(3–2)/(1–0)

C/2006 P1 (McNaught): (2007)
01/16.56	0.228	3	HCNJ(3–2)/(1–0)	299²	> 375²
01/16.56	0.228	5	HCNJ(3–2)/(1–0)	> 168²	> 600²
01/16.55	0.229	5.9	CH₃OH 157 GHz
01/16.56	0.229	4.9	CH₃OH 157 GHz
01/17.5	0.255	6.5	HCNJ(3–2), v₂ = 1/v₂ = 0	< 278	< 677¹
01/17.55	0.255	6.7	CH₃OH 157 GHz	> 130	> 90
01/17.55	0.255	6.9	CH₃CN 147 GHz

Notes.

⁽¹⁾

A significant fraction of the molecules are outside the collisional region and a higher gas temperature is needed to populate the v = 1 level inside the collision zone.

⁽²⁾

A 10% calibration uncertainty in each line is assumed.

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