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Table 1.
GP models explored in the TESS and Spitzer data.
| Model | Mean function | Kernel | ||
|---|---|---|---|---|
| A: red noise only | Constant (μ) | M32 | ||
| B: quasi-periodic variability | Constant (μ) | Rotation | ||
| C: red noise+single sinusoid | μ + A0 sin(2π t/Prot + ϕ) | M32 | ||
| D: red noise + truncated Fourier series |
 |
M32 | ||
| E: red noise + double sinusoid |
 |
M32 | ||
Notes. The Matérn-3/2 kernel (M32) is given by the expression 
(Rasmussen & Williams 2006) and the rotation kernel by 
(Foreman-Mackey et al. 2017), where r is a variable of the time defined as r = |ti − tj|.
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