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Fig. 9

image

Grain temperature as a function of distance from the star for a model with stellar parameters M = 1 M, L = 5000 L and T = 2800 K during luminosity minimum. Top panel: the original temperature structure of the Mg2SiO4 grains (black) and the temperature structure when setting a minimum temperature of 800 K (red) and 500 K (blue). Lower panels: the original temperature structure of the Mg2SiO4 grains (black) and the temperature structure of dust particles with a core of Mg2SiO4 and a mantle of MgFeSiO4 when it is thermally stable (T< 1000 K), as indicated by the vertical grey line. The green, red and blue lines show the temperature structure for a mantle size that is 1%, 5% and 10% of the grain radius, respectively.

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