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- W1658042893 abstract "Thi.s work is divided into two parts: a grey model for past Triton. Pluto, and Kuipcr heir objects, and a nongrey model for current Titan's troposphere. Steady-state, planar models of early atmospheres for Triton. Pluto, and Kiiii)er belt objects are computed using a grey approach that tracks the transfer/distribution of heat via radiative transport. These objects are treated here together because they resemble one another in size, surface chemical composition, and e.xist in the same cold portion of the outer solar system. Beginning with present-dav volarilcs observed on the surfaces of Triton and Pluto (methane and molecular nitrogen), a trace of molecular hydrogen (present in most primordial atmospheres) is addf'd. It is assumed that as the object is heated by solar, tidal, accretional. or radiogenic nietliod.s (this varies between the objects treated here) these chemical species then eva[)orare from the surface to create an atmosphere. Binary collisions among the nu)lecules account for the sources of opacity, and absorption coefficients are provided bv 21 . The grey atmosphere calculations require a mean opacity, and its results are sensitive to the type of mean opacity used. Thus a variety of methods (Planck. Rosselanfl. and Chandrasekhar mean opacities) are used to accommodate this dependence and the variations in optical depth. Surface temperatures are then calculated as a function of the heating rate, molecular hydrogen abundance, and mean opacity type. .As a result of these modelling experiments, tidal heating is found to be crucial to the formation of a thick atmosphere on Triton, and albedo and gravitational acceleration strongly affect the formation of atmospheres on less massive objects such as Pluto and Kuiper belt objects. -A nongrey. steady-state, planar model of Titan's current troposphere is developed to study the effect of varving methane mass fraction. Methods from stellar atmosphere modelling are used to solve the equation of transfer as a two-point boundary problem." @default.
- W1658042893 created "2016-06-24" @default.
- W1658042893 creator A5029564517 @default.
- W1658042893 date "2001-10-01" @default.
- W1658042893 modified "2023-10-17" @default.
- W1658042893 title "Titan, Triton, Pluto, and Kuiper belt objects: A study of past and present atmospheres with grey and nongrey models" @default.
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