The Charon-forming giant impact as a source of Pluto’s dark equatorial regions View Full Text


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Article Info

DATE

2017-01-30

AUTHORS

Yasuhito Sekine, Hidenori Genda, Shunichi Kamata, Taro Funatsu

ABSTRACT

Pluto exhibits complex regional diversity in its surface materials1,2. One of the most striking features is the dark reddish material, possibly organic matter, along Pluto’s equator coexisting with the H2O-rich crust2. Little is known, however, about the surface process responsible for the dark equatorial regions. Here, we propose that Pluto’s dark regions were formed through reactions in elongated pools of liquid water near the equator, generated by the giant impact that formed Charon3–5. Our laboratory experiments show that dark reddish organic matter, comparable to Pluto’s dark materials, is produced through polymerization of simple organic compounds6,7 that would have been present in proto-Pluto (for example, formaldehyde) by prolonged heating at temperatures ≥50 °C. Through hydrodynamic impact simulations, we demonstrate that an impactor, one-third the mass of Pluto, colliding with proto-Pluto—with an interior potential temperature of 150–200 K—could have generated both a Charon-sized satellite and high-temperature regions around Pluto’s equator. We also propose that high-velocity giant impacts result in global or hemispherical darkening and reddening, suggesting that the colour variety of large Kuiper belt objects8–12 could have been caused by frequent, stochastic giant impacts in a massive outer protoplanetary disk in the early Solar System13–16. More... »

PAGES

0031

Identifiers

URI

http://scigraph.springernature.com/pub.10.1038/s41550-016-0031

DOI

http://dx.doi.org/10.1038/s41550-016-0031

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1074248232


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