Detection of water vapor on Jupiter with the Odin space telescope

Details Detection of water vapor on Jupiter with the Odin space telescope Detection of water vapor on Jupiter with the Odin space telescope

Aug 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007epsc.conf..609c&link_type=abstract

European Planetary Science Congress 2007, Proceedings of a conference held 20-24 August, 2007 in Potsdam, Germany. Online at ht

Astronomy and Astrophysics

Astronomy

Scientific paper

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. 1997). The presence of the atmospheric cold trap implies an external origin for H2O (interplanetary dust (IDP), sputtering from the satellites and /or rings, large meteoritic impacts. . . ). In the case of Jupiter, the sources of water could either be IDP or the Shoemaker-Levy 9 (SL9) comet's impacts (Moses et al. 2000, Lellouch et al. 2002). The H2O submillimetric line at 557 GHz on Jupiter 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 measurements (Lellouch et al. 2002). SWAS measurements favored an IDP source, whereas ISO observations favored a SL9 source. 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. Both origins have been modeled with our photochemical model (Ollivier et al. 2000, adapted for Jupiter). Spectral analysis shows that a SL9 model gives better fits to the Odin and SWAS data than the IDP model. We will present the fits we obtained and the derived values for the retrieved column density and initial deposition level. References : Feuchtgruber et al. (1997), Nature, 389, 159-162. Feuchtgruber et al. (1999), The Universe as Seen by ISO. Eds. P. Cox & M. F. Kessler. ESA-SP, 427, 133. Lellouch et al. (1997), BAAS, 29, 992. Moses et al. (2000), Icarus, 145, 166-202. Lellouch et al. (2002), Icarus, 159, 112-131. Bergin et al. (2000), ApJ, 539, L147- L150. Ollivier et al. (2000), Plan. Space Sci., 48, 699-716.

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