Detection of water vapor on Jupiter with the Odin space telescope

T. Cavalié (1, 2, 3) , F. Billebaud (1, 2, 3) , E. Lellouch (4) , N. Biver (4) , M. Dobrijevic (1, 2, 3) , J. Brillet (1, 2, 3) , A. Lecacheux (4) , A. Hjalmarson (5) , A. Sandqvist (6) , U. Frisk (7) , M. Olberg (5)

1 LAB - Laboratoire d'Astrophysique de Bordeaux [Pessac]
2 L3AB - Laboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux
3 OASU - Observatoire aquitain des sciences de l'univers
4 LESIA - Laboratoire d'études spatiales et d'instrumentation en astrophysique
5 Onsala Space Observatory
6 Stockholm Observatory Department of Astronomy
7 SSC - Swedish Space Corporation

The Infrared Space Observatory (ISO) has detected water vapor in the stratospheres of the giant planets and Titan and CO2 on Jupiter, Saturn and Neptune (Feuchtgruber et al. 1997, 1999, Lellouch et al. 1999). The presence of the atmospheric cold trap implies an external origin for H2O (interplanetary dust, sputtering from the satellites and /or rings, large meteoritic impacts). The H2O submillimeric line at 557 GHz was detected by the Submillimeter-Wave Astronomy Satellite (SWAS) in 1999 and 2001 (Bergin et al. 2000, Lellouch et al. 2002), but the vertical profile and the column density derived from the observations are different from the one obtained from ISO mesurements (Lellouch et al. 2002).The swedish sub-millimeter satellite Odin carries out a long lasting monitoring of Jupiter's H20 (110-101) 557 GHz line, since its launch in 2001. As an example, the high resolution H2O spectrum obtained on November 8th, 2002, will be presented and discussed here. Spectral analysis combined with the use of our photochemical model (Ollivier et al. 2000, adapted for Jupiter) provides new clues which help understanding the discrepancy between the ISO and SWAS results.

Domaines: Cosmologie et astrophysique extra-galactique [astro-ph.CO]; Astrophysique [astro-ph]

T. Cavalié, F. Billebaud, E. Lellouch, N. Biver, M. Dobrijevic, et al.. Detection of water vapor on Jupiter with the Odin space telescope. Odin Astronomy Workshop in Paris, 16-17 March, 2007, 2007, Paris, France. ⟨hal-00139629⟩