Extended Data Fig. 1: TMTS light curve and Lomb-Scargle periodogram for J0526.
From: A seven-Earth-radius helium-burning star inside a 20.5-min detached binary
Upper panel: the TMTS L-band light curve over a 12 hr night on 18 December 2020. The magnitudes are presented as mean values ± 1σ. Middle panel: a 3000 s subset of the TMTS L-band light curve. The solid red line represents the best-fit sinusoidal model with a period of 10.3 min. Lower panel: the Lomb-Scargle periodogram (LSP) computed from the TMTS light curve. The vertical dashed line indicates the frequency corresponding to maximum power (\({{{{\rm{f}}}}}_{\max }\)). The purple dot-dashed line represents the confidence level of 0.1%, and the red arrow shows the frequency corresponding to the orbital period (that is, \({{{{\rm{f}}}}}_{\max }\)/2).
