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Periodic variation in the water production of comet C/2001 Q4 (NEAT) observed with the Odin satellite

N. Biver ; D. Bockelée-Morvan ; P. Colom ; J. Crovisier ; A. Lecacheux ; U. Frisk ; Åke Hjalmarson (Institutionen för radio- och rymdvetenskap, Radioastronomi och astrofysik) ; Michael Olberg (Institutionen för radio- och rymdvetenskap, Nationella anläggningen för radioastronomi) ; Aa. Sandqvist
Astronomy & Astrophysics (0004-6361). Vol. 501 (2009), 1, p. 359-366.
[Artikel, refereegranskad vetenskaplig]

Context: Comet C/2001 Q4 (NEAT) was extensively studied with the 1.1-m submillimetre telescope of the Odin satellite. The H2O line at 557 GHz was regularly observed from 6 March to 16 May 2004 and nearly continuously monitored during 3 periods between 26 April and 2 May 2004. Aims: This last set of data shows periodic variations in the line intensity, and we looked for characterising the long- and short-term behaviour of this comet. Methods: We used the variance ratio method and χ2 minimization to find the period of variation in the water production rate and simulations to infer its amplitude at the nucleus surface. Results: A 40% periodic variation in the water production rate is measured with a period of 0.816±0.004 day (19.58±0.1 h). The comet also exhibits a seasonal effect with a mean peak of outgassing around 2.7×1029 molec. s-1 taking place about 18 days before perihelion.

Nyckelord: astrochemistry, comets, C/2001 Q4 (NEAT), radio lines, solar system, submillimetre



Denna post skapades 2010-02-03. Senast ändrad 2014-09-02.
CPL Pubid: 111474

 

Institutioner (Chalmers)

Institutionen för radio- och rymdvetenskap, Radioastronomi och astrofysik (2005-2010)
Institutionen för radio- och rymdvetenskap, Nationella anläggningen för radioastronomi (2005-2010)

Ämnesområden

Astronomi, astrofysik och kosmologi

Chalmers infrastruktur