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Fig. 1

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A schematic view of the ε Eridani system’s architecture. The outer ring is the region where the dust is produced by parent planetesimals; the intermediate zone is the one where it is transported inward by drag forces, possibly interacting with a presumed outer planet; transport continues through the inner region where dust interacts with the known inner planet. Two possible orbits of the inner planet are shown. The outer part of the sketch ( > 10   AU) is not to scale. Inset: the observed SED. The IRS spectrum (dots) stems from dust in the inner region and exhibits a characteristic “plateau” (“shoulder”) at λ ≈ 20–30   μm. The main part of the SED with a maximum at λ ≈ 70–80   μm, well probed by several photometry points (symbols with error bars), derives from the outer and intermediate regions.

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