grains2 documentation

Use grains2 to calculate the temperature and spectrum of dust in equilibrium with radiation, with optional considerations for sublimation. grains2 is designed for observations of solar system dust at a single location with respect to the Sun, but implementations for other scenarios is possible (e.g., an exocomet around beta Pic).

The concepts are primarily based on the Hanner-Harker dust model for comets (Harker et al. 2002, 2007). However, support for cometary crystalline silicates is incomplete.

grains2 is primarily Mie-based. Bohren and Huffman Mie code is from Bruce Draine.

Contents:

• Grain composition and refractive indices
  • Pure materials
  • Effective medium approximation
• Grain temperatures
  • Solid grains
  • Porous grains
• Thermal emission spectra
• Grain size distributions
• Grain porosity models
• Ice sublimation
  • Temperature and mass-loss rate
  • Grain sublimation lifetime