Environmental Science (all); Earth and Planetary Sciences (all)
Résumé :
[en] It has been thought that Io’s many paterae may contain lava lakes, but observations by NASA’s Galileo spacecraft at sufficiently high resolution were limited to a few locations, such as Loki Patera. Data acquired by NASA’s Juno mission in May 2023 reveal a common set of thermal characteristics for at least ten paterae on Io, with bright (hot) “thermal rings” around the perimeter of their floors. Loki, Surt, Fuchi, Amaterasu, Mulungu, Chors, and Dazhbog Patera, and four unnamed paterae, all show the same pattern of surface temperature. This new Juno/JIRAM data suggests that hot rings around paterae are a common phenomenon, and that they are indicative of active lava lakes. All the investigated paterae lack recent lava flows on their flanks, suggesting that at the time of observations, the level of the lake was not high enough to overflow the rim. These observations provide insight about the characteristics of paterae’s activity, which may involve either central upwelling of magma, or up-and-down “piston-like” vertical motion of the lake surface. Tidal forces, which are extreme at Io, could play a role as well. Future observations from Juno, particularly during the closest flybys, may indicate which mechanism is more plausible.
Centre/Unité de recherche :
STAR - Space sciences, Technologies and Astrophysics Research - ULiège
Disciplines :
Aérospatiale, astronomie & astrophysique
Auteur, co-auteur :
Mura, Alessandro ; Istituto Nazionale di Astrofisica—Istituto di Astrofisica e Planetologia Spaziali, Rome, Italy
Tosi, Federico ; Istituto Nazionale di Astrofisica—Istituto di Astrofisica e Planetologia Spaziali, Rome, Italy
Zambon, Francesca; Istituto Nazionale di Astrofisica—Istituto di Astrofisica e Planetologia Spaziali, Rome, Italy
Lopes, Rosaly M. C. ; Jet Propulsion Laboratory, California Institute of Technology, Pasadena, United States
Mouginis-Mark, Peter J.; Hawaii Institute Geophysics and Planetology, Honolulu, United States
Becker, Heidi; Jet Propulsion Laboratory, California Institute of Technology, Pasadena, United States
Filacchione, Gianrico; Istituto Nazionale di Astrofisica—Istituto di Astrofisica e Planetologia Spaziali, Rome, Italy
Migliorini, Alessandra ; Istituto Nazionale di Astrofisica—Istituto di Astrofisica e Planetologia Spaziali, Rome, Italy
Hansen, Candice. J.; Planetary Science Institute, Tucson, United States
Adriani, Alberto; Istituto Nazionale di Astrofisica—Istituto di Astrofisica e Planetologia Spaziali, Rome, Italy
Altieri, Francesca; Istituto Nazionale di Astrofisica—Istituto di Astrofisica e Planetologia Spaziali, Rome, Italy
Bolton, Scott; Southwest Research Institute, San Antonio, United States
Cicchetti, Andrea; Istituto Nazionale di Astrofisica—Istituto di Astrofisica e Planetologia Spaziali, Rome, Italy
Di Mico, Elisa; Istituto Nazionale di Astrofisica—Istituto di Astrofisica e Planetologia Spaziali, Rome, Italy
Grassi, Davide; Istituto Nazionale di Astrofisica—Istituto di Astrofisica e Planetologia Spaziali, Rome, Italy
Noschese, Raffaella ; Istituto Nazionale di Astrofisica—Istituto di Astrofisica e Planetologia Spaziali, Rome, Italy
Moirano, Alessandro ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP) ; Istituto Nazionale di Astrofisica—Istituto di Astrofisica e Planetologia Spaziali, Rome, Italy
Pettine, Madeline; Cornell University, Ithaca, United States
Piccioni, Giuseppe; Istituto Nazionale di Astrofisica—Istituto di Astrofisica e Planetologia Spaziali, Rome, Italy
We thank Jani Radebaugh and Christopher Hamilton for providing insightful comments and suggestions which greatly improve the value of this work. We also thank Agenzia Spaziale Italiana (ASI) for the support of the JIRAM contribution to the Juno mission. This work is funded by the ASI\u2013INAF Addendum no. 2016-23-H.3-2023 to grant 2016-23-H.0.
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