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An ongoing satellite–ring cycle of Mars and the origins of Phobos and Deimos

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The Martian moons Phobos and Deimos may have accreted from a ring of impact debris, but explaining their origin from a single giant impact has proven difficult. One clue may lie in the orbit of Phobos that is slowly decaying as the satellite undergoes tidal interactions with Mars. In about 70 million years, Phobos is predicted to reach the location of tidal breakup and break apart to form a new ring around the planet. Here we use numerical simulations to suggest that the resulting ring will viscously spread to eventually deposit about 80% of debris onto Mars; the remaining 20% of debris will accrete into a new generation of satellites. Furthermore, we propose that this process has occurred repeatedly throughout Martian history. In our simulations, beginning with a large satellite formed after a giant impact with early Mars, we find that between three and seven ring–satellite cycles over the past 4.3 billion years can explain Phobos and Deimos as they are observed today. Such a scenario implies the deposition of significant ring material onto Mars during each cycle. We hypothesize that some anomalous sedimentary deposits observed on Mars may be linked to these periodic episodes of ring deposition.

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Figure 1: Formation of Phobos through the evolution of the previous two ring–satellite cycles.
Figure 2: History of Martian satellites as calculated by RING-MOONS.

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  1. Rivkin, A. Near-infrared spectrophotometry of Phobos and Deimos. Icarus 156, 64–75 (2002).

    Article  Google Scholar 

  2. Burns, J. A. in Mars (eds Kieffer, H. H., Jakowsky, B. M., Snyder, C. W. & Matthews, M. S.) 1283–1301 (Univ. Arizona Press, 1992).

    Google Scholar 

  3. Cameron, A. G. W. & Ward, W. R. The origin of the Moon. In Abstr. Lunar Planet. Sci. Conf. Vol. 7 120–122 (1976).

    Google Scholar 

  4. Charnoz, S., Salmon, J. & Crida, A. The recent formation of Saturn’s moonlets from viscous spreading of the main rings. Nature 465, 752–754 (2010).

    Article  Google Scholar 

  5. Crida, A. & Charnoz, S. Formation of regular satellites from ancient massive rings in the solar system. Science 338, 1196–1199 (2012).

    Article  Google Scholar 

  6. Craddock, R. A. Are Phobos and Deimos the result of a giant impact? Icarus 211, 1150–1161 (2011).

    Article  Google Scholar 

  7. Rosenblatt, P. & Charnoz, S. On the formation of the Martian moons from a circum-Martian accretion disk. Icarus 221, 806–815 (2012).

    Article  Google Scholar 

  8. Citron, R. I., Genda, H. & Ida, S. Formation of Phobos and Deimos via a giant impact. Icarus 252, 334–338 (2015).

    Article  Google Scholar 

  9. Canup, R. M. & Salmon, J. On an origin of Phobos-Deimos by giant impact. In 47th Lunar Planet. Sci. Conf. Abstr. 2598 (2016).

    Google Scholar 

  10. Leone, G., Tackley, P. J., Gerya, T. V., May, D. A. & Zhu, G. Three-dimensional simulations of the southern polar giant impact hypothesis for the origin of the Martian dichotomy. Geophys. Res. Lett. 8736–8743 (2014).

  11. Nimmo, F., Hart, S. D., Korycansky, D. G. & Agnor, C. B. Implications of an impact origin for the Martian hemispheric dichotomy. Nature 453, 1220–1223 (2008).

    Article  Google Scholar 

  12. Andrews-Hanna, J. C., Zuber, M. T. & Banerdt, W. B. The Borealis basin and the origin of the Martian crustal dichotomy. Nature 453, 1212–1215 (2008).

    Article  Google Scholar 

  13. Marinova, M. M., Aharonson, O. & Asphaug, E. I. Mega-impact formation of the Mars hemispheric dichotomy. Nature 453, 1216–1219 (2008).

    Article  Google Scholar 

  14. Marinova, M. M., Aharonson, O. & Asphaug, E. Geophysical consequences of planetary-scale impacts into a Mars-like planet. Icarus 211, 960–985 (2011).

    Article  Google Scholar 

  15. Murray, C. D. & Dermott, S. F. Solar System Dynamics (Cambridge Univ. Press, 1999).

    Google Scholar 

  16. Black, B. A. & Mittal, T. The demise of Phobos and development of a Martian ring system. Nat. Geosci. 8, 913–917 (2015).

    Article  Google Scholar 

  17. Rosenblatt, P. et al. Accretion of Phobos and Deimos in an extended debris disc stirred by transient moons. Nat. Geosci. 9, 581–583 (2016).

    Article  Google Scholar 

  18. Yoder, C. F. Tidal rigidity of Phobos. Icarus 49, 327–346 (1982).

    Article  Google Scholar 

  19. Scheeres, D. J., Hartzell, C. M., Sánchez, P. & Swift, M. Scaling forces to asteroid surfaces: the role of cohesion. Icarus 210, 968–984 (2010).

    Article  Google Scholar 

  20. Kite, E. S., Halevy, I., Kahre, M. A., Wolff, M. J. & Manga, M. Seasonal melting and the formation of sedimentary rocks on Mars, with predictions for the Gale Crater mound. Icarus 223, 181–210 (2013).

    Article  Google Scholar 

  21. Hurford, T. A. et al. Tidal disruption of Phobos as the cause of surface fractures. J. Geophys. Res. Planet. 121, 1054–1065 (2016).

    Article  Google Scholar 

  22. Werner, S. C. & Tanaka, K. L. Redefinition of the crater-density and absolute-age boundaries for the chronostratigraphic system of Mars. Icarus 215, 603–607 (2011).

    Article  Google Scholar 

  23. Salmon, J., Charnoz, S., Crida, A. & Brahic, A. Long-term and large-scale viscous evolution of dense planetary rings. Icarus 209, 771–785 (2010).

    Article  Google Scholar 

  24. Bath, G. T. & Pringle, J. E. The evolution of viscous discs - I. Mass transfer variations. R. Astron. Soc. 194, 967–986 (1981).

    Article  Google Scholar 

  25. Toomre, A. On the gravitational stability of a disk of stars. Astrophys. J. 139, 1217–1238 (1964).

    Article  Google Scholar 

  26. Anderson, J. D. Jr Computational Fluid Dynamics (McGraw-Hill, 1995).

    Google Scholar 

  27. Duncan, M. J., Levison, H. F. & Lee, M. H. A Multiple time step symplectic algorithm for integrating close encounters. Astron. J. 116, 2067–2077 (1998).

    Article  Google Scholar 

  28. Takeuchi, T., Miyama, S. M. & Lin, D. N. C. Gap formation in protoplanetary disks. Astrophys. J. 460, 832–847 (1996).

    Article  Google Scholar 

  29. Esposito, L. Planetary Rings (Cambridge Univ. Press, 2006).

    Google Scholar 

  30. Goldreich, P. & Tremaine, S. The excitation of density waves at the Lindblad and corotation resonances by an external potential. Astrophys J. 233, 857–871 (1979).

    Article  Google Scholar 

  31. Meyer-Vernet, N. & Sicardy, B. On the physics of resonant disk-satellite interaction. Icarus 69, 157–175 (1987).

    Article  Google Scholar 

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The authors would like to thank B. Horgan, M. Ćuk, E. Asphaug, A. Jackson and K. Walsh for their advice and support. A.J.H. was supported under the NASA Earth and Space Science Fellowship: 16-PLANET16F-0127. D.A.M. was supported under the NASA Emerging Worlds Grant: NNX16AI31G.

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Both A.J.H. and D.A.M. designed the study, discussed the results, and wrote the paper. A.J.H. developed the computer model, performed the simulations, analysed the results, and produced the tables and figures.

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Correspondence to Andrew J. Hesselbrock.

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Hesselbrock, A., Minton, D. An ongoing satellite–ring cycle of Mars and the origins of Phobos and Deimos. Nature Geosci 10, 266–269 (2017).

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