The Stagnant Silicate Basins and Obsidian Regolith of TOI-2081 b

Orbiting an M-dwarf star at a distance that enforces permanent tidal locking, TOI-2081 b presents a study in extreme geological contrast. As a super-Earth with a radius significantly larger than our own, this planet possesses a physical structure dominated by high-density refractory materials. Because one hemisphere remains fixed toward its stellar primary, the thermal gradient between the day-side and the night-side dictates a unique distribution of inorganic compounds across its surface.

The Stagnant Silicate Basins and Obsidian Regolith of TOI-2081 b - Section 1 overview

The day-side of TOI-2081 b is a region characterized by consistent radiative equilibrium. The lack of significant axial rotation results in a stagnant atmosphere where convective patterns are tethered to the sub-stellar point. Observations suggest a surface dominated by vast basaltic plains, similar to the lunar maria but forged under the intense persistent illumination of its host star. The mineralogy is predominantly composed of magnesium-rich pyroxene and olivine, materials capable of withstanding the elevated temperatures found at the interface of the lithosphere and the thin, desiccated atmosphere.

Geological Composition and Mantle Dynamics

The interior of TOI-2081 b is structured around a massive iron-nickel core, which accounts for a substantial fraction of its total radius. This high-density core facilitates the presence of a rigid lithosphere. Unlike planets with dynamic tectonic cycles, this body exhibits a static crustal architecture. The absence of lateral plate movement suggests that the surface features are primarily products of ancient volcanic outgassing and primary crustal cooling, rather than secondary tectonic resurfacing. This geological stability allows for the preservation of large-scale impact features that have remained unaltered for gigayears.

Atmospheric and Thermal Profiles

While the day-side experiences perpetual, unshifting daylight, the night-side remains draped in permanent shadow. The atmosphere, likely stripped of light volatile elements over its long history, consists of heavy-element vapor trace constituents. These elements form a thin, stagnant layer that fails to redistribute heat effectively. Consequently, the night-side temperature drops sharply, leading to the deposition of mineral condensates. These deposits manifest as fine-grained, obsidian-like regolith that carpets the dark hemisphere, absorbing radiation without reflection.

Surface Morphology and Exploration Potential

The transition zone between the day and night hemispheres—the terminator region—serves as the primary focus for analyzing the planet’s thermal extremes. In these twilight regions, the lighting angles are low, casting long, sharp shadows across the cratered regolith. The surface here consists of broken, jagged rock formations and expansive, flat obsidian basins. The lack of moisture or organic chemistry ensures that these geological structures remain in their current state indefinitely, reflecting only the harsh physical realities of a tidally locked, radiation-exposed lithospheric environment.

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