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Impact jetting of water ice, with application to the accretion of icy planetesimals and Pluto

McKinnon, William B.

Geophysical research letters, 1989-11, Vol.16 (11), p.1237-1240 [Periódico revisado por pares]

Legacy CDMS: Blackwell Publishing Ltd

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Título:
Impact jetting of water ice, with application to the accretion of icy planetesimals and Pluto
Autor: McKinnon, William B.
Assuntos: 640107 - Astrophysics & Cosmology- Planetary Phenomena ; CHEMICAL COMPOSITION ; CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS ; COLLISIONS ; Compressibility ; EQUATIONS ; EQUATIONS OF STATE ; EVAPORATION ; HYDROGEN COMPOUNDS ; ICE ; Impact velocity ; JETS ; Low pressure ; Lunar And Planetary Exploration ; MELTING ; NEBULAE ; Obliqueness ; OXYGEN COMPOUNDS ; PHASE TRANSFORMATIONS ; PLANET-SYSTEM ACCRETION ; PLANETARY EVOLUTION ; PLANETS ; PLUTO PLANET ; Rock ; ROCKS ; SATELLITES ; SOLAR NEBULA ; SOLAR SYSTEM EVOLUTION ; Vaporization ; WATER
É parte de: Geophysical research letters, 1989-11, Vol.16 (11), p.1237-1240
Notas: istex:19EF26E58D3275C362AEF1F073A0FB33B2F73698
ark:/67375/WNG-09CBLT8D-F
ArticleID:89GL03197
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Descrição: Jetting can occur during oblique impacts of water-ice bodies at relative velocities as low as 500 m/sec, because of the low Hugoniot elastic limit and high compressibility of ice compared to rock. In jetted ice, incipient melting, complete melting, and incipient vaporization occur, upon release to low pressure, at impact velocities of 1.3, 2.0, and 2.7 km/sec, respectively, much less than the 3.4, 4.4, and 5.3 km/sec, required in head-on collisions. Uncertainties in the shock equation-of-state may allow complete melting during jetting of relative velocities as low as 1.2 km/sec. Because jet speeds exceed impact speeds during the accretion of icy bodies greater than a few 100 km in radius, there may be a significant loss of icy material. Thus, jetting during a Charon-forming collision (and not vaporization) may account for Pluto-Charon's relatively large rock/ice ratio, should the C/O ratio of the solar nebula turn out to be too low to sufficiently raise the rock/ice ratio of outer solar nebula condensates by formation of noncondensable CO.
Editor: Legacy CDMS: Blackwell Publishing Ltd
Idioma: Inglês

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Impact jetting of water ice, with application to the accretion of icy planetesimals and Pluto

McKinnon, William B.

Legacy CDMS: Blackwell Publishing Ltd

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