Fig. 3

Two simulated transit light curves generated by PRISM. These were both generated using a 1.0 R⊕ Earth-sized planet transiting a 3200 K, 0.155 R⊙ M4V dwarf star with i = 90.0° and P = 1 d. The starspotproperties are θ = 0°, ϕ = 90°, rspot = 0.009R* (left), rspot = 0.017R* (right), and Tspot = 3000 K. The observational wavelength and rms scatter for the simulated transits were set at 600 nm and 60 ppm, respectively. The starspot anomaly becomes visible over the simulated noise when rspot is increased from 0.009R* to 0.017R*. The solid lines represents the noise-free synthetic light curves containing the starspot anomaly, while the filled circles represent the spot-free synthetic light curves (see Sect. 3) with added Gaussian noise.
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