Observed dayside brightness temperature of LHS 3844b (red; 1σ range), vs. the planet's theoretical dayside equilibrium temperature for two different rotation states (solid curves). The blue curve assumes pseudo-synchronous rotation, the green curve assumes Mercury-like 3:2 rotation. Shaded blue and green regions indicate the effect of increasing or decreasing LHS 3844b's tidal dissipation efficiency by 1 order of magnitude.

Credit: The Astrophysical Journal (2024). DOI: 10.3847/1538-4357/ad2077