Tables of optical properties of dust grains in exoplanets
Authors:
J. Budaj, M. Kocifaj, R. Salmeron, I. Hubeny
Image & caption:
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Image caption::
Opacity of corundum as a function of particle size and wavelength.
Description:
There has been growing observational evidence for the presence of condensates in the atmospheres and/or comet-like tails of extrasolar planets. In this paper we present calculations and analysis of non-isotropic phase functions, asymmetry parameter (mean cosine of the scattering angle), absorption and scattering opacities, single scattering albedos, equilibrium temperatures, and radiative accelerations of dust grains relevant for extrasolar planets. Our assumptions include spherical grain shape, Deirmendjian particle size distribution, and Mie theory. We consider several species: corundum/alumina, perovskite, olivines with 0 and 50 per cent iron content, pyroxenes with 0, 20, and 60 per cent iron content, pure iron, carbon at two different temperatures, water ice, liquid water, and ammonia. The presented tables cover the wavelength range of 0.2-500 μm and modal particle radii from 0.01 to 100 μm. Equilibrium temperatures and radiative accelerations assume irradiation by a non-blackbody source of light with temperatures from 7000 to 700 K seen at solid angles from 2π to 10-6 sr. The tables are provided to the community together with a simple code which allows for an optional, finite, angular dimension of the source of light (star) in the phase function.
Reference:
Monthly Notices of the Royal Astronomical Society, Volume 454, Issue 1, p.2-27
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