Microwave spectra of the leading and trailing hemispheres of Iapetus
hal.structure.identifier | PLANETO - LATMOS | |
hal.structure.identifier | Laboratoire 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.identifier | Laboratoire d'études spatiales et d'instrumentation en astrophysique = Laboratory of Space Studies and Instrumentation in Astrophysics [LESIA] | |
dc.contributor.author | BONNEFOY, Léa | |
hal.structure.identifier | Laboratoire d'études spatiales et d'instrumentation en astrophysique = Laboratory of Space Studies and Instrumentation in Astrophysics [LESIA] | |
dc.contributor.author | LELLOUCH, Emmanuel | |
hal.structure.identifier | PLANETO - LATMOS | |
hal.structure.identifier | Institut universitaire de France [IUF] | |
dc.contributor.author | LE GALL, Alice | |
hal.structure.identifier | Laboratoire 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.author | LESTRADE, Jean-François | |
hal.structure.identifier | Laboratoire d'études spatiales et d'instrumentation en astrophysique = Laboratory of Space Studies and Instrumentation in Astrophysics [LESIA] | |
dc.contributor.author | MORENO, Raphaël | |
hal.structure.identifier | National Radio Astronomy Observatory [Socorro] [NRAO] | |
dc.contributor.author | BUTLER, Bryan | |
hal.structure.identifier | Institut de RadioAstronomie Millimétrique [IRAM] | |
dc.contributor.author | BOISSIER, Jérémie | |
hal.structure.identifier | Laboratoire d'études spatiales et d'instrumentation en astrophysique = Laboratory of Space Studies and Instrumentation in Astrophysics [LESIA] | |
dc.contributor.author | LEYRAT, Cédric | |
hal.structure.identifier | Laboratoire Atmosphères, Milieux, Observations Spatiales [LATMOS] | |
dc.contributor.author | SULTANA, Robin | |
hal.structure.identifier | Laboratoire d'études spatiales et d'instrumentation en astrophysique = Laboratory of Space Studies and Instrumentation in Astrophysics [LESIA] | |
hal.structure.identifier | Laboratoire d'Astrophysique de Bordeaux [Pessac] [LAB] | |
dc.contributor.author | CAVALIÉ, Thibault | |
hal.structure.identifier | Harvard-Smithsonian Center for Astrophysics [CfA] | |
dc.contributor.author | GURWELL, Mark | |
hal.structure.identifier | Stratospheric Observatory for Infrared Astronomy [SOFIA] | |
dc.contributor.author | MOULLET, Arielle | |
hal.structure.identifier | Instituto de RadioAstronomía Milimétrica [IRAM] | |
dc.contributor.author | LADJELATE, Bilal | |
hal.structure.identifier | Institut de Planétologie et d'Astrophysique de Grenoble [IPAG] | |
dc.contributor.author | PONTHIEU, Nicolas | |
dc.date.issued | 2024 | |
dc.identifier.issn | 0019-1035 | |
dc.description.abstractEn | The 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.iso | en | |
dc.publisher | Elsevier | |
dc.subject.en | Saturnian satellites | |
dc.subject.en | Radio telescopes | |
dc.subject.en | Surface ices | |
dc.subject.en | Natural satellite surfaces | |
dc.subject.en | Very Large Array | |
dc.title.en | Microwave spectra of the leading and trailing hemispheres of Iapetus | |
dc.type | Article de revue | |
dc.identifier.doi | 10.1016/j.icarus.2024.115950 | |
dc.subject.hal | Planète et Univers [physics] | |
bordeaux.journal | Icarus | |
bordeaux.volume | 411 | |
bordeaux.peerReviewed | oui | |
hal.identifier | insu-04390930 | |
hal.version | 1 | |
hal.popular | non | |
hal.audience | Internationale | |
hal.origin.link | https://hal.archives-ouvertes.fr//insu-04390930v1 | |
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