Equilibrium temperature of ice grains formed around a star as a function of stellar parameters

Statistics – Computation

Scientific paper

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Ice Formation, Ice Nuclei, Interstellar Matter, Stellar Envelopes, Thermal Analysis, Ambient Temperature, Comets, Computational Astrophysics, Icy Satellites, Solar System

Scientific paper

Theoretical equilibrium temperatures of water ice spheres assumed to be in orbit around a star are presented as a function of the star parameters, distance to the grain, and grain radius. The results are reliable up to stellar temperatures of about 60,000 K. They show that the minimum in 'grain' temperature predicted for solar system ice near 60 microns in radius is a general property, and that grains of any size have a minimal temperature around 10,000-K stars. The implications of the results on the past thermal history of solar system ices and the detectability of ices around other stars are briefly discussed.

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