Close-range remote sensing of Saturn's rings during Cassini's ring-grazing orbits and Grand Finale.

Autor: Tiscareno MS; Carl Sagan Center for the Study of Life in the Universe, SETI Institute, Mountain View, CA 94043, USA. matt@seti.org., Nicholson PD; Department of Astronomy, Cornell University, Ithaca, NY 14853, USA., Cuzzi JN; NASA Ames Research Center, Moffett Field, CA 94035, USA., Spilker LJ; NASA Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, USA., Murray CD; Astronomy Unit, Queen Mary University of London, London E1 4NS, UK., Hedman MM; Department of Physics, University of Idaho, Moscow, ID 83844, USA., Colwell JE; Department of Physics, University of Central Florida, Orlando, FL 32816, USA., Burns JA; Department of Astronomy, Cornell University, Ithaca, NY 14853, USA.; College of Engineering, Cornell University, Ithaca, NY 14853, USA., Brooks SM; NASA Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, USA., Clark RN; Planetary Science Institute, Tucson, AZ 85719, USA., Cooper NJ; Astronomy Unit, Queen Mary University of London, London E1 4NS, UK., Deau E; NASA Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, USA.; Department of Earth, Planetary, and Space Sciences, University of California at Los Angeles, Los Angeles, CA 90095, USA., Ferrari C; Institut de Physique du Globe de Paris, Centre National de la Recherche Scientifique (CNRS)-Unité Mixte de Recherche (UMR) 7154, Université Paris-Diderot, Université Sorbonne-Paris-Cité (USPC), Paris, France., Filacchione G; INAF-IAPS (Istituto Nazionale di AstroFisica-Istituto di Astrofisica e Planetologia Spaziali), Rome, Italy., Jerousek RG; Department of Physics, University of Central Florida, Orlando, FL 32816, USA., Le Mouélic S; Laboratoire de Planetologie et Geodynamique, CNRS-UMR 6112, Université de Nantes, 44322 Nantes, France., Morishima R; NASA Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, USA.; Department of Earth, Planetary, and Space Sciences, University of California at Los Angeles, Los Angeles, CA 90095, USA., Pilorz S; Carl Sagan Center for the Study of Life in the Universe, SETI Institute, Mountain View, CA 94043, USA., Rodriguez S; Institut de Physique du Globe de Paris, Centre National de la Recherche Scientifique (CNRS)-Unité Mixte de Recherche (UMR) 7154, Université Paris-Diderot, Université Sorbonne-Paris-Cité (USPC), Paris, France., Showalter MR; Carl Sagan Center for the Study of Life in the Universe, SETI Institute, Mountain View, CA 94043, USA., Badman SV; Physics Department, Lancaster University, Lancaster LA1 4YB, UK., Baker EJ; Space Science Institute, Boulder, CO 80301, USA., Buratti BJ; NASA Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, USA., Baines KH; NASA Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, USA., Sotin C; NASA Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, USA.
Jazyk: angličtina
Zdroj: Science (New York, N.Y.) [Science] 2019 Jun 14; Vol. 364 (6445).
DOI: 10.1126/science.aau1017
Abstrakt: Saturn's rings are an accessible exemplar of an astrophysical disk, tracing the Saturn system's dynamical processes and history. We present close-range remote-sensing observations of the main rings from the Cassini spacecraft. We find detailed sculpting of the rings by embedded masses, and banded texture belts throughout the rings. Saturn-orbiting streams of material impact the F ring. There are fine-scaled correlations among optical depth, spectral properties, and temperature in the B ring, but anticorrelations within strong density waves in the A ring. There is no spectral distinction between plateaux and the rest of the C ring, whereas the region outward of the Keeler gap is spectrally distinct from nearby regions. These results likely indicate that radial stratification of particle physical properties, rather than compositional differences, is responsible for producing these ring structures.
(Copyright © 2019 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works.)
Databáze: MEDLINE
Externí odkaz:
Nepřihlášeným uživatelům se plný text nezobrazuje