Cited by 48Astro and Planetary ScienceStellar, planetary, and galactic studiesAstrophysics and Star Formation Studies

MIGRATION OF A MOONLET IN A RING OF SOLID PARTICLES: THEORY AND APPLICATION TO SATURN'S PROPELLERS

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Crida, Aurélien, Papaloizou, John C. B., Rein, Hanno, Charnoz, Sébastien, Salmon, Julien·2010·The Astronomical Journal

Abstract

Hundred-meter-sized objects have been identified by the Cassini spacecraft in Saturn's A ring through the so-called propeller features they create in the ring. These moonlets should migrate due to their gravitational interaction with the ring; in fact, some orbital variations have been detected. The standard theory of type I migration of planets in protoplanetary disks cannot be applied to the ring system as it is pressureless. Thus, we compute the differential torque felt by a moonlet embedded in a two-dimensional disk of solid particles, with a flat surface density profile, both analytically and numerically. We find that the corresponding migration rate is too small to explain the observed variations of the propeller's orbit in Saturn's A ring. However, local density fluctuations (due to gravity wakes in the marginally gravitationally stable A ring) may exert a stochastic torque on a moonlet. Our simulations show that this torque can be large enough to account for the observations depending on the parameters of the rings. We find that on timescales of several years the migration of propellers is likely to be dominated by stochastic effects (while the former, non-stochastic migration dominates after ∼10 4 –10 5 years). In that case, the migration rates provided by observations so far suggest that the surface density of the A ring should be on the order of 700 kg m −2 . The age of the propellers should not exceed 1–100 million years depending on the dominant migration regime.

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Crossref · 10.1088/0004-6256/140/4/944

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  • The observed non-Keplerian radial motions of propeller moonlets may result from interactions between moonlets and stochastic density fluctuations in the disk or between moonlets and ring particles on loosely bound frog orbits.

    “These motions may result from interactions between moonlets and stochastic density fluctuations in the disk (Crida et al. 2010;Rein & Papaloizou 2010;Pan et al. 2012) or between moonlets and ring particles on loosely bound”

    From MIGRATION OF SMALL MOONS IN SATURN's RINGS (2013) · cites this paper as Crida et al. 2010

  • Interactions between small moons and very large ring particles or local enhancements in ring surface density lead to stochastic migration, often reducing migration rates significantly.

    “Interactions between small moons and (1) very large ring particles or (2) local enhancements in ring surface density lead to stochastic migration, often reducing migration rates significantly (Crida et al. 2010;Rein & Papaloizou 2010;Tiscareno 2012).”

    From MIGRATION OF SMALL MOONS IN SATURN's RINGS (2013) · cites this paper as Crida et al. 2010

  • Stochastic migration in a self-gravitating ring, interactions with surface density variations in the ring, and oscillatory motion from interactions with corotating material have similar low drift rates.

    “Stochastic migration in a self-gravitating ring (Rein & Papaloizou 2010;Crida et al. 2010), interactions with surface density variations in the ring (Tiscareno 2012), and oscillatory motion from interactions with corotating material (Pan & Chiang 2010, 2012) have similar low drift rates.”

    From MIGRATION OF SMALL MOONS IN SATURN's RINGS (2013) · cites this paper as Crida et al. 2010

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Research works printed but not linked: 1

  1. Rein, H., Papaloizou, J. C. B., 2010. Stochatic or- bital migration of small bodies in saturn's rings. A&A, in preparation, available on arXiv.

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Authors
Crida, A., Papaloizou, J. C. B., Rein, H., Charnoz, S., & Salmon, J.
Affiliations
  • Centre National de la Recherche Scientifique (FR)
  • University of Cambridge (GB)
Corresponding author
Crida, Aurélien
Venue
The Astronomical Journal
Published
2010-08-24
Volume
140
Issue
4
Pages
944-953
ISSN
  • 0004-6256 (ISSN-L)
  • 1538-3881
OpenAlex
W1968613709
Cited by
48
References
57
Citations by year
2024: 2 · 2020: 1 · 2019: 2 · 2018: 21 · 2017: 1 · 2016: 1 · 2015: 1 · 2014: 1 · 2013: 3 · 2012: 3
FWCI
3.21
Type
journal article
Language
en
Open access
Locations
  • The Astronomical Journal (publishedVersion)
  • arXiv (Cornell University) (submittedVersion)
  • HAL (submittedVersion)
  • arXiv (Cornell University)
Funders
Science and Technology Facilities Council (ST/G002584/1)
Topics
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Astro and Planetary Science
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Stellar, planetary, and galactic studies
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Astrophysics and Star Formation Studies
Keywords
Cassini observations

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