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Communication Dans Un Congrès Année : 2018

SL9 Species Imaging in Jupiter's Auroral Regions with ALMA

Thibault Cavalié
  • Fonction : Auteur
Raphaël Moreno
  • Fonction : Auteur
Emmanuel Lellouch
  • Fonction : Auteur
V. Hue
Thomas K. Greathouse
  • Fonction : Auteur
J. A. Sinclair
  • Fonction : Auteur
M. Dobrijevic
Franck Hersant
  • Fonction : Auteur
Christopher Jarchow
  • Fonction : Auteur
Ladislav Rezac
  • Fonction : Auteur
Bruno Bézard
  • Fonction : Auteur
G. Randall Gladstone
  • Fonction : Auteur
Laurent Lamy
  • Fonction : Auteur
Edwige Chapillon
  • Fonction : Auteur

Résumé

Comet Shoemaker-Levy 9 (SL9) impacted Jupiter in 1994 at mid-southern latitudes. The impacts resulted in the delivery of new species to Jupiter's stratosphere, like CO, HCN, CS, H2O and CO2. These species have been used ever since to assess stratospheric chemistry and the magnitude of meridional transport. In March 2017, and thus more than 20 years after the impacts, we successfully mapped HCN and CO with ALMA. Our observations provide us with a latitudinal resolution of 3$\,^{\circ}$ at the equator and 7$\,^{\circ}$ at 70$\,^{\circ}$S. While most of the material is confined to the mbar level from the low to the mid latitudes, in agreement with predictions, we find unexpected emissions at high altitudes in the south polar region. These emissions are very well correlated with the position of the auroral oval. At the observation central meridian longitude, the northern auroral oval was not very visible from Earth, regardless of any SL9-related hemispheric differences in HCN and CO abundances. We will present our observations and discuss the implications on stratospheric chemistry, temperature and advective transport.
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Dates et versions

hal-03803291 , version 1 (06-10-2022)

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  • HAL Id : hal-03803291 , version 1

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Thibault Cavalié, Raphaël Moreno, Emmanuel Lellouch, Thierry Fouchet, V. Hue, et al.. SL9 Species Imaging in Jupiter's Auroral Regions with ALMA. DPS meeting #49, Oct 2017, Provo, United States. ⟨hal-03803291⟩
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