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Caption: Figure 22.
A series of GLS periodograms examining the signals in our TOI 560 RV time-series as described in the text including iSHELL, HIRES, and PFS. The top panel is a periodogram of the RVs after subtracting a stellar activity model fit. The middle panel additionally subtracts a model fit for TOI 560 b and stellar activity to search for a second planet, and the bottom panel subtracts a model fit for both TOI 560 b and c and stellar activity to search for a third planet. The periods of b and c are marked with dashed black and orange vertical lines and also the rotation period, one-half of it, and one-third of it are marked with dashed red, blue, and green vertical lines, respectively, in each panel. The bootstrap FAPs of 1% and 10% were marked with cyan horizontal dashed lines. Note, it remains challenging to find nontransiting RV planets at orbital periods near the stellar-rotation period or one of its prominent integer fraction aliases (e.g., 1/2, 1/3), as the GP stellar activity model could potentially “absorb” such a Keplerian signature (Vanderburg et al. 2016; Kossakowski et al. 2022).
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© 2022. The Author(s). Published by the American Astronomical Society.
