Evolution of the thermal component and light curves of the merger-nova emission (Eq. (7)) for different ejecta masses, color-coded from 10⁻⁴ to 5 × 10⁻³ M_⊙. The top-left panel is the temperature evolution in the observer frame, while the other three panels represent the merger-nova emission at different frequencies (i.e., hν: 1 keV, 30 eV, and 1 eV). The model fixed parameters are ξ = 0.3, η = 10⁻³, κ = 1.0 cm² g⁻¹, B_p = 3 × 10¹⁵ G, and P_i = 5 ms.