[en] The localized delivery of new long-lived species to Jupiter’s stratosphere by comet Shoemaker–Levy 9 in 1994 opened a window to constrain Jovian chemistry and dynamics by monitoring the evolution of their vertical and horizontal distributions. However, the spatial distributions of CO and HCN, two of these long-lived species, had never been jointly observed at high latitudinal resolution. Atacama large millimeter/submillimeter array observations of HCN and CO in March 2017 show that CO was meridionally uniform and restricted to pressures lower than 3 ± 1 mbar. HCN shared a similar vertical distribution in the low- to mid-latitudes, but was depleted at pressures between 2−1+2 and 0.04−0.03+0.07 mbar in the aurora and surrounding regions, resulting in a drop by two orders of magnitude in column density. We propose that heterogeneous chemistry bonds HCN on large aurora-produced aerosols at these pressures in the Jovian auroral regions causing the observed depletion.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Cavalié, T. ; University of Bordeaux, CNRS, LAB, UMR 5804, Pessac, France ; LESIA, Paris Observatory, University of PSL, CNRS, Sorbonne University, University of Paris, Meudon, France
Rezac, L. ; Max-Planck-Institute for Solar System Research, Göttingen, Germany
Moreno, R. ; LESIA, Paris Observatory, University of PSL, CNRS, Sorbonne University, University of Paris, Meudon, France
Lellouch, E. ; LESIA, Paris Observatory, University of PSL, CNRS, Sorbonne University, University of Paris, Meudon, France
Fouchet, T. ; LESIA, Paris Observatory, University of PSL, CNRS, Sorbonne University, University of Paris, Meudon, France
Benmahi, Bilal ; Université de Liège - ULiège > Unités de recherche interfacultaires > Space sciences, Technologies and Astrophysics Research (STAR) ; University of Bordeaux, CNRS, LAB, UMR 5804, Pessac, France
Greathouse, T.K.; Southwest Research Institute, San Antonio, United States
Sinclair, J.A. ; Jet Propulsion Laboratory, California Institute of Technology, Pasadena, United States
Hue, V.; Southwest Research Institute, San Antonio, United States
Hartogh, P.; Max-Planck-Institute for Solar System Research, Göttingen, Germany
Dobrijevic, M.; University of Bordeaux, CNRS, LAB, UMR 5804, Pessac, France
Carrasco, N. ; LATMOS, CNRS, UVSQ University of Paris-Saclay, Sorbonne University, Guyancourt, France
Perrin, Z.; LATMOS, CNRS, UVSQ University of Paris-Saclay, Sorbonne University, Guyancourt, France
CNES - Centre National d'Études Spatiales [FR] INSU - Institut National des Sciences de l'Univers [FR]
Funding text :
T.C. acknowledges funding from CNES and the Programme National de Planétologie of CNRS/INSU. This paper makes use of the following ALMA data: ADS/JAO.ALMA\#2016.1.01235.S. ALMA is a partnership of ESO (representing its member states), National Science Foundation (USA) and NINS (Japan), together with the National Research Council (Canada), MOST and ASIAA (Taiwan) and KASI (Republic of Korea), in cooperation with the Republic of Chile. The Joint ALMA Observatory is operated by ESO, AUI/NRAO and NAOJ.T.C. acknowledges funding from CNES and the Programme National de Planétologie of CNRS/INSU. This paper makes use of the following ALMA data: ADS/JAO.ALMA\#2016.1.01235.S. ALMA is a partnership of ESO (representing its member states), National Science Foundation (USA) and NINS (Japan), together with the National Research Council (Canada), MOST and ASIAA (Taiwan) and KASI (Republic of Korea), in cooperation with the Republic of Chile. The Joint ALMA Observatory is operated by ESO, AUI/NRAO and NAOJ.
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