LISA’s capability to measure chirp masses and constrain binary component masses. Left panel: Fractional uncertainty on the chirp mass. Solid (dashed) lines represent face-on (edge-on) binary configurations, and stars denote representative simulated systems. Right panel: Constraints on component masses. The shaded areas between solid lines denote sources at 2 mHz. Dotted lines represent sources at 6 and 10 mHz. These constraints assume that the symmetric mass ratio (i.e. m₁m₂/(m₁ + m₂)²) is unknown, and they are sampled from a uniform prior. Vertical dashed grey lines delimit three representative classes: configurations that produce no explosion (m₁ < 0.5 M_⊙), those likely resulting in a low-luminosity thermonuclear transient (0.5 < m₁ < 0.8 M_⊙), and those that will likely result in a normal SN Ia (m₁ > 0.8 M_⊙).