Extended Data Fig. 6: TRAPPIST-1 b’s dayside spectrum for different geologically fresh surface materials (left) and a space weathered basalt surface (right). | Nature Astronomy

Extended Data Fig. 6: TRAPPIST-1 b’s dayside spectrum for different geologically fresh surface materials (left) and a space weathered basalt surface (right).

From: No thick atmosphere around TRAPPIST-1 b and c from JWST thermal phase curves

Extended Data Fig. 6: TRAPPIST-1 b’s dayside spectrum for different geologically fresh surface materials (left) and a space weathered basalt surface (right).

Left: Models for the planet’s dayside emission spectrum based on geologically fresh materials (curves), compared to the contrast ratio at 15μm from this work (black point) and the reported contrast ratio at 12.8μm (from Ducrot et al. 2024). Right: Space weathering darkens the surface and could improve the match to the observed flux at 15μm. Progressively darker curves correspond to increasing space weathering via the addition of graphite.

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