Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aj....113.2312f&link_type=abstract
Astronomical Journal v.113, p.2312
Astronomy and Astrophysics
Astronomy
11
Planets And Satellite: Individual: Hyperion, Planets And Satellite: Individual: Titan
Scientific paper
Two peculiar features of the Saturnian satellite system, that is, the dense, N2-dominated atmosphere of Titan, and the very irregular shape of Hyperion, are probably related to each other. Numerical integrations show that most fragments ejected after the catastrophic breakup of a presumably larger and nearly-spherical proto-Hyperion fell onto Titan over a time scale of 103 yr, at impact speeds <4 km/s. Such impacts resulted into accretion of the constituent volatile materials into Titan's atmosphere. If proto- Hyperion was ≍1000 km in diameter, the entire current atmosphere may have been generated by this impact shower. Even for a smaller total mass of the impactors, any pre-existing atmosphere must have been chemically reprocessed, producing large amounts of N2 by shock effects. Impacts by proto-Hyperion fragments are also likely to have formed giant impact basins on Titan's surface.
Farinella Paolo
Marzari Francesco
Matteoli S.
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