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Microwave spectra of the leading and trailing hemispheres of Iapetus

hal.structure.identifierPLANETO - LATMOS
hal.structure.identifierLaboratoire d'Etude du Rayonnement et de la Matière en Astrophysique et Atmosphères = Laboratory for Studies of Radiation and Matter in Astrophysics and Atmospheres [LERMA]
hal.structure.identifierLaboratoire d'études spatiales et d'instrumentation en astrophysique = Laboratory of Space Studies and Instrumentation in Astrophysics [LESIA]
dc.contributor.authorBONNEFOY, Léa
hal.structure.identifierLaboratoire d'études spatiales et d'instrumentation en astrophysique = Laboratory of Space Studies and Instrumentation in Astrophysics [LESIA]
dc.contributor.authorLELLOUCH, Emmanuel
hal.structure.identifierPLANETO - LATMOS
hal.structure.identifierInstitut universitaire de France [IUF]
dc.contributor.authorLE GALL, Alice
hal.structure.identifierLaboratoire d'Etude du Rayonnement et de la Matière en Astrophysique et Atmosphères = Laboratory for Studies of Radiation and Matter in Astrophysics and Atmospheres [LERMA]
dc.contributor.authorLESTRADE, Jean-François
hal.structure.identifierLaboratoire d'études spatiales et d'instrumentation en astrophysique = Laboratory of Space Studies and Instrumentation in Astrophysics [LESIA]
dc.contributor.authorMORENO, Raphaël
hal.structure.identifierNational Radio Astronomy Observatory [Socorro] [NRAO]
dc.contributor.authorBUTLER, Bryan
hal.structure.identifierInstitut de RadioAstronomie Millimétrique [IRAM]
dc.contributor.authorBOISSIER, Jérémie
hal.structure.identifierLaboratoire d'études spatiales et d'instrumentation en astrophysique = Laboratory of Space Studies and Instrumentation in Astrophysics [LESIA]
dc.contributor.authorLEYRAT, Cédric
hal.structure.identifierLaboratoire Atmosphères, Milieux, Observations Spatiales [LATMOS]
dc.contributor.authorSULTANA, Robin
hal.structure.identifierLaboratoire d'études spatiales et d'instrumentation en astrophysique = Laboratory of Space Studies and Instrumentation in Astrophysics [LESIA]
hal.structure.identifierLaboratoire d'Astrophysique de Bordeaux [Pessac] [LAB]
dc.contributor.authorCAVALIÉ, Thibault
hal.structure.identifierHarvard-Smithsonian Center for Astrophysics [CfA]
dc.contributor.authorGURWELL, Mark
hal.structure.identifierStratospheric Observatory for Infrared Astronomy [SOFIA]
dc.contributor.authorMOULLET, Arielle
hal.structure.identifierInstituto de RadioAstronomía Milimétrica [IRAM]
dc.contributor.authorLADJELATE, Bilal
hal.structure.identifierInstitut de Planétologie et d'Astrophysique de Grenoble [IPAG]
dc.contributor.authorPONTHIEU, Nicolas
dc.date.issued2024
dc.identifier.issn0019-1035
dc.description.abstractEnThe leading hemisphere of Saturn’s synchronous moon Iapetus is covered by a low-albedo material, contrasting with its bright trailing hemisphere. This dichotomy is also apparent in radar and microwave radiometry observations, which are sensitive to the properties of the near subsurface. To better understand the regional properties of Iapetus and their variations with depth, we assemble the microwave spectra of its leading and trailing hemispheres. Pre-existing data are combined with new millimetric and centimetric observations acquired with the IRAM 30-meter dish, IRAM NOEMA interferometer, and VLA interferometer. These data, interpreted with the help of a model with vertically uniform thermal properties, reveal complex variations in structure and/or composition with depth on the leading side. Meanwhile, the trailing side emissivity is found to be especially low at all observed frequencies, indicating efficient scattering processes on subsurface structures, as observed on Saturn’s other icy moons. We also report the first observations of Saturn’s retrograde moon Phoebe at these frequencies, which has an emissivity higher than that of the trailing hemisphere of Iapetus and similar to its dark leading side, consistent with the theory that Phoebe is the source of the dark material on Iapetus.
dc.language.isoen
dc.publisherElsevier
dc.subject.enSaturnian satellites
dc.subject.enRadio telescopes
dc.subject.enSurface ices
dc.subject.enNatural satellite surfaces
dc.subject.enVery Large Array
dc.title.enMicrowave spectra of the leading and trailing hemispheres of Iapetus
dc.typeArticle de revue
dc.identifier.doi10.1016/j.icarus.2024.115950
dc.subject.halPlanète et Univers [physics]
bordeaux.journalIcarus
bordeaux.volume411
bordeaux.peerReviewedoui
hal.identifierinsu-04390930
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//insu-04390930v1
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