Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010dps....42.6104b&link_type=abstract
American Astronomical Society, DPS meeting #42, #61.04; Bulletin of the American Astronomical Society, Vol. 42, p.1088
Astronomy and Astrophysics
Astronomy
Scientific paper
Accretional temperature profiles for Titan are used to determine the conditions needed to avoid global melting as a function of the timing, duration, and nebular conditions of its formation. Titan can accrete undifferentiated in a gas-starved disk (Canup & Ward 2002, 2006, 2009) even with modest quantities of ammonia mixed in with its ices (Barr et al., 2010). The timetable required for formation of an undifferentiated Callisto (Barr & Canup 2008) is consistent with limited melting in Titan during formation.
Simulations of impact-induced core formation (Barr & Canup 2010) are used to show that Titan can remain in a partially differentiated state after an outer solar system late heavy bombardment (LHB), capable of melting its outer layers, permitting some of its rock to consolidate into a core. Thus, we describe a scenario for the formation and early evolution of Titan consistent with its relatively high moment of inertia (Iess et al., 2010). We will also discuss implications of the post-LHB heterogeneous density structure within Titan for interpretation of the moment of inertia coefficient.
Barr Amy Courtright
Canup Robin M.
Citron Robert I.
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