Loss of a satellite could explain Saturn’s obliquity and young rings-Reference-Cited by-同舟云学术

Loss of a satellite could explain Saturn’s obliquity and young rings

Published:2022-09-16 Issue:6612 Volume:377 Page:1285-1289
ISSN:0036-8075
Container-title:Science
language:en
Short-container-title:Science

Author:

Wisdom Jack¹^ORCID,Dbouk Rola¹^ORCID,Militzer Burkhard²³^ORCID,Hubbard William B.⁴^ORCID,Nimmo Francis⁵^ORCID,Downey Brynna G.⁵^ORCID,French Richard G.⁶^ORCID

Affiliation:

1. Department of Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.

2. Department of Astronomy, University of California, Berkeley, CA 94720, USA.

3. Department of Earth and Planetary Science, University of California, Berkeley, CA 94720, USA.

4. Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ 85721-0092, USA.

5. Department of Earth and Planetary Sciences, University of California, Santa Cruz, CA 95064, USA.

6. Department of Astronomy, Wellesley College, Wellesley, MA 02481, USA.

Abstract

The origin of Saturn’s ~26.7° obliquity and ~100-million-year-old rings is unknown. The observed rapid outward migration of Saturn’s largest satellite, Titan, could have raised Saturn’s obliquity through a spin-orbit precession resonance with Neptune. We use Cassini data to refine estimates of Saturn’s moment of inertia, finding that it is just outside the range required for the resonance. We propose that Saturn previously had an additional satellite, which we name Chrysalis, that caused Saturn’s obliquity to increase through the Neptune resonance. Destabilization of Chrysalis’s orbit ~100 million years ago can then explain the proximity of the system to the resonance and the formation of the rings through a grazing encounter with Saturn.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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