Long-period modulation of the classical T Tauri star CI Tau - Evidence for an eccentric close-in massive planet at 0.17 au

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Volume 686 (June 2024)

A&A, 686 (2024) A249

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Table 1

Priors and best-fit parameters for MCMC fit of the QP-GP for the 6.6 d and 9 d periods.

Parameter	Prior	Fit Value
Hyperparameters for 9 d spot
GP amplitude (h₁) [K2 mag.]	𝒰[0.05, 1.0]	${0.46}_{- 0.02}^{+ 0.8}$ ${0.46_{ - 0.02}^{ + 0.8}}$
Spot period (P₁) [d]	𝒰[8.5, 9.5]	${9.3}_{- 0.3}^{+ 0.2}$ ${9.3_{ - 0.3}^{ + 0.2}}$
Smoothing (λ_p1)	𝒰[0.1, 1.5]	${0.2}_{- 0.07}^{+ 0.01}$ ${0.2_{ - 0.07}^{ + 0.01}}$
Evol. timescale $(λ_{e_{1}})$ $\left( {{\lambda _{{e_1}}}} \right)$ [d]	Fixed	20.0
White noise amplitude (σ_k2)	Fixed	0.01

Hyperparameters for 6.6 d period
GP amplitude (h₂) [K2 mag.]	𝒰[0.05, 1.0]	${0.45}_{- 0.01}^{+ 0.7}$ ${0.45_{ - 0.01}^{ + 0.7}}$
Spot period (P₂) [d]	𝒰[6.0, 7.0]	${6.6}_{- 0.2}^{+ 0.2}$ ${6.6_{ - 0.2}^{ + 0.2}}$
Smoothing (λ_p2)	𝒰[0.1, 1.5]	${0.8}_{- 0.03}^{+ 0.4}$ ${0.8_{ - 0.03}^{ + 0.4}}$
Evol. timescale $(λ_{e_{2}})$ $\left( {{\lambda _{{e_2}}}} \right)$ [d]	Fixed	20.0

Fit report
RMS data [K2 mag.]	–	1.0
RMS residuals [K2 mag.]	–	0.09

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