Table 3
Simulation parameters.
| Grain properties(1) | |
|---|---|
| Density(a) | 3 g cm−3 |
| Size(b) | 0.15–0.27 μm (2) |
| Species and | Mg2SiO4, 99% (alt. 90%) |
| abundances(b,c,d) | Fe2SiO4, 1% (alt. 1%) |
| Al2O3, 0% (alt. 9%) | |
| Maximum albedo, ηMax | Mg2SiO4: 0.99 (λ = 0.67μm) |
| Fe2SiO4: 0.99 (λ = 0.68 μm) | |
| Al2O3: 0.73 (λ = 0.27 μm) | |
| Average scattering | Mg2SiO4: g = 0.59 |
| angle, g = ⟨cosθ⟩, | Fe2SiO4: g = 0.53 |
| at maximum albedo (3) | Al2O3: g = 0.87 |
| Dust cloud properties(1) | |
| Total dust masses(4) | 10−8 M⊙ to 10−4 M⊙ |
| Radii | 5–5000 au |
| Density profile, ρ(r) | ∝ r−2 |
| Spiral inter-arm | 250 au |
| distance, 2 πb | |
| Spiral & disc thickness(5) | 9 au(5) |
| Other simulation parameters | |
| N thermal photons | 107 |
| N scattering photons(6) | 106 |
| N spectral photons(6) | 106 |
| Scattering type(e) | Henyey-Greenstein approximation |
| Wavelength range | 0.1–4000 μm |
| N wavelength bins(7) | 520 |
| Spatial grid | 4 level-refined octree |
Notes. (1) Adopted value(s). (2) Gaussian distribution centred on 0.20 μm. (3) ⟨cos θ⟩ is the average of the cosine of the scattering angle. (4)In five logarithmic steps (see text for details). (5)Spiral cross section is a square because of the spatial grid. The disc thickness increases when the distance to the star is larger than 128 au, see Sect. 3.2 for details. (6) Per wavelength bin. (7) Logarithmic range plus photometry wavelengths.
References. (a)Moro-Martín (2013), (b) Höfner & Olofsson (2018), (c)Gobrecht et al. (2016), (d)Jones et al. (2014), (e)Henyey & Greenstein (1941).
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