A collisional family of icy objects in the Kuiper belt (original) (raw)

Nature volume 446, pages 294–296 (2007)Cite this article

Abstract

The small bodies in the Solar System are thought to have been highly affected by collisions and erosion. In the asteroid belt, direct evidence of the effects of large collisions can be seen in the existence of separate families of asteroids—a family consists of many asteroids with similar orbits and, frequently, similar surface properties, with each family being the remnant of a single catastrophic impact1. In the region beyond Neptune, in contrast, no collisionally created families have hitherto been found2. The third largest known Kuiper belt object, 2003 EL61, however, is thought to have experienced a giant impact that created its multiple satellite system, stripped away much of an overlying ice mantle, and left it with a rapid rotation3,4,5. Here we report the discovery of a family of Kuiper belt objects with surface properties and orbits that are nearly identical to those of 2003 EL61. This family appears to be fragments of the ejected ice mantle of 2003 EL61.

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References

  1. Bendjoya & Zappala, V. Asteroid family identification, in Asteroids III (eds Bottke, W., Cellino, A., Paolicchi, P. & Binzel, R. P.) 613–618 (Univ. Arizona Press, Tucson, 2002)
    Google Scholar
  2. Farinella, P., Davis, D. R. & Stern, S. A. Formation and collisional evolution of the Edgeworth-Kuiper belt, in Protostars and Planets IV (eds Mannin, V., Boss, A. P. & Russell, S. S.) 1255–1268 (Univ. Arizona Press, Tucson, 2000)
    Google Scholar
  3. Brown, M. E. et al. Satellites of the largest Kuiper belt objects. Astrophys. J. 639, L43–L46 (2006)
    Article ADS Google Scholar
  4. Barkume, K. M., Brown, M. E. & Schaller, E. L. Water ice on the satellite of Kuiper belt object 2003 EL61. Astrophys. J. 640, L87–L89 (2006)
    Article ADS Google Scholar
  5. Rabinowitz, D. L. et al. Photometric observations constraining the size, shape and albedo of 2003 EL61, a rapidly rotating Pluto-sized object in the Kuiper Belt. Astrophys. J. 639, 1238–1251 (2006)
    Article ADS Google Scholar
  6. Barucci, M. A., Merlin, F., Dotto, E., Doressoundiram, A. & de Bergh, C. TNO surface ices: Observations of the TNO 55638 (2003 VE95) and analysis of the population’s spectral properties. Astron. Astrophys. 455, 725–730 (2006)
    Article ADS CAS Google Scholar
  7. Brown, M. E., Trujillo, C. A. & Rabinowitz, D. L. Discovery of a planetary-sized object in the scattered Kuiper belt. Astrophys. J. 635, L97–L99 (2005)
    Article ADS CAS Google Scholar
  8. Licandro, J. et al. The methane ice rich surface of large TNO 2005 FY9: a Pluto-twin in the trans-neptunian belt?. Astron. Astrophys. 445, L35–L38 (2006)
    Article ADS CAS Google Scholar
  9. Brown, M. E. et al. Methane and ethane on the bright Kuiper belt object 2005 FY9. Astron. J. (in the press).
  10. Hainaut, O. R. & Delsanti, A. C. Colors of minor bodies in the outer Solar System. A statistical analysis. Astron. Astrophys. 389, 641–644 (2002)
    Article ADS Google Scholar
  11. Nesvorny, D. & Roig, F. Mean motion resonances in the transneptunian region part II: The 1:2, 3:4, and weaker resonances. Icarus 150, 104–123 (2001)
    Article ADS Google Scholar
  12. Kuchner, M. J., Brown, M. E. & Holman, M. Long-term dynamics and the orbital inclinations of the classical Kuiper belt objects. Astron. J. 124, 1221–1230 (2002)
    Article ADS Google Scholar
  13. Melosh, H. J. & Ryan, E. V. Asteroids: Shattered but not dispersed. Icarus 129, 562–564 (1997)
    Article ADS Google Scholar
  14. Benz, W. & Asphaug, E. Catastrophic disruptions revisited. Icarus 142, 5–20 (1999)
    Article ADS Google Scholar
  15. Agnor, C. & Asphaug, E. Accretion efficiency during planetary collisions. Astrophys. J. 613, L157–L160 (2004)
    Article ADS Google Scholar
  16. Canup, R. M. Simulations of a late lunar-forming impact. Icarus 168, 433–456 (2004)
    Article ADS CAS Google Scholar
  17. Canup, R. M. A giant impact origin of Pluto-Charon. Science 307, 546–550 (2005)
    Article ADS CAS Google Scholar
  18. Nesvorny, D. et al. Karin cluster formation by asteroid impact. Icarus 183, 296–311 (2006)
    Article ADS Google Scholar
  19. Asphaug, E., Agnor, C. B. & Williams, Q. Hit-and-run planetary collisions. Nature 439, 155–160 (2006)
    Article ADS CAS Google Scholar
  20. Chiang, E. I. A collisional family in the classical Kuiper belt. Astrophys. J. 573, L65–L68 (2002)
    Article ADS Google Scholar

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Acknowledgements

We thank R. Sari, B. McKinnon, K. Noll, T. Ahrens and A. Morbidelli for their suggestions and comments on this work. This research is supported by a grant to M.E.B. from NASA Planetary Astronomy. Author Contributions M.E.B. was lead author of this Letter, and K.M.B., D.R. and E.L.S. contributed equally.

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Authors and Affiliations

  1. Division of Geological and Planetary Sciences, California Institute of Technology, Mail Code 150-21, 1200 E. California Blvd, Pasadena, California 91125, USA,
    Michael E. Brown, Kristina M. Barkume, Darin Ragozzine & Emily L. Schaller

Authors

  1. Michael E. Brown
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  2. Kristina M. Barkume
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  3. Darin Ragozzine
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  4. Emily L. Schaller
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Corresponding author

Correspondence toMichael E. Brown.

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Reprints and permissions information is available at www.nature.com/reprints. The authors declare no competing financial interests.

Supplementary information

Supplementary Information

This file contains Supplementary Discussion, Supplementary Figures 1-2 with Legends, Supplementary Table 1 and additional references. The parts of Supplementary Information discuss all of the infrared spectra and colours the orbital dynamics of the family. (PDF 1211 kb)

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Brown, M., Barkume, K., Ragozzine, D. et al. A collisional family of icy objects in the Kuiper belt.Nature 446, 294–296 (2007). https://doi.org/10.1038/nature05619

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Editorial Summary

Meet the family

In the asteroid belt there are many separate families of asteroids, each consisting of many asteroids with similar orbits that are remnants of a single catastrophic impact. No collisionally created families had been detected in the distant Solar System beyond Neptune. But now Brown et al. describe a family of Kuiper belt objects (KBOs) with surface properties and orbits nearly identical to those of 2003 EL61, which is the third-largest known KBO, large enough to have two moons. The collisional history of the family members should provide invaluable data on the consequences of giant impacts in the Solar System.

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