From small dust to micron-sized aggregates: The influence of structure and composition on the dust optical properties

Open Access

Table 1

Pilot sample of 1 μm dust grains.

Acronym	Shape	Monomer size (a₀, nm)	Specificity	Characteristic radius a_c (μm)	Composition
Sph.	Sphere	1000	/	1	a-Sil2 a-Sil7
Prol.	Spheroid	1000	Prolate γ = 2	1.1	a-Sil2 a-Sil7
P.Sph._0.54	Sphere	1000	p = 0.54^(a)	1.3	a-Sil2 a-Sil7
${Agg.}_{1 μ m}^{100 n m}$ $\[\text{Agg.}_{1 ~\mu \mathrm{m}}^{100 \mathrm{~nm}}\]$	Aggregate	100	p^⋆ = 0.54^(b)	1.3	a-Sil2 a-Sil7
${Agg.}_{1 μ m}^{50 n m}$ $\[\text{Agg.}_{1 ~\mu \mathrm{m}}^{50 \mathrm{~nm}}\]$	Aggregate	50	p^⋆ = 0.64^(b)	1.4	a-Sil2
${Agg.:ice}_{1.26 μ m}^{50 n m}$ $\[\text{Agg.:ice}_{1.26 ~\mu \mathrm{m}}^{50 \mathrm{~nm}}\]$	Aggregate	50	Ice mantle	1.4	a-Sil2 + H₂O

Notes. All grains have an equivalent radius of a_eff = 1 μm, except for the iced aggregate, which consists of its non-iced equivalent covered by the same volume of ice: its equivalent radius is thus a_eff = 1.26 μm. When not specified, the aspect ratio is by default 1 and the porosity is by default 0. The characteristic radius, a_c, is defined as $\sqrt{5 / 3} r_{g}$ $\[\sqrt{5 / 3} r_{g}\]$ and represents the overall radius of the grain. ^(a)Porosity of the bulk material. ^(b)Porosity of the aggregate (Kozasa et al. 1992).

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