Four TESS sectors of GJ 1239 have no box signal above a control threshold at periods from 19.825 to 19.862 days

We searched four public TESS sectors of GJ 1239 for transits near a reported radial velocity period of 19.84 days. We used 12,139 ten-minute bins from sectors 13, 27, 67, and 94. The search tested 401 periods from 19.82528094 to 19.86204678 days and durations from 1 to 6 hours. The largest simple aperture flux box score was 24.45. The threshold from 256 shifted-data controls was 36.80. In 73 controls, the score was at least as large as the observed score. This threshold is not a calibrated false-alarm probability. We tested sensitivity with 1536 synthetic circular transits before trend removal. We used six radii, two impact parameters, fixed stellar properties, and assumed limb darkening. Each trial received the full period, duration, and phase search. Recovery required the threshold score, timing agreement, and well sampled events in at least two sectors. At 3 Earth radii, we recovered 124 of 128 central transits and 104 of 128 transits at impact parameter 0.8. At 4 Earth radii, the counts were 126 and 125. These rates apply to the stated input distribution and analysis. The result does not confirm or reject the radial velocity candidate. The package contains the source light curves, provenance, all trial results, code, figures, and reproduction instructions.

GJ 1239 · HD 183783 · TIC 113248833 · TESS · transit search · radial velocity candidate · synthetic transits · detection sensitivity · public data