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 2

Priors and best-fit parameters for MCMC global fit of the Keplerian orbit and 9 d spot.

Parameter	Prior	Fit value
Keplerian orbital parameters
P_orb [d]	𝒰[21, 29]	${25.2}_{- 1.8}^{+ 1.7}$ ${25.2_{ - 1.8}^{ + 1.7}}$
ecc.	𝒰[0.0, 0.99]	${0.58}_{- 0.06}^{+ 0.05}$ ${0.58_{ - 0.06}^{ + 0.05}}$
K [km s⁻¹]	𝒰[0.0, 1.0]	${0.30}_{- 0.03}^{+ 0.02}$ ${0.30_{ - 0.03}^{ + 0.02}}$
T₀ [d]	𝒰[58 780, 58 880]	${58 821.4}_{- 2.4}^{+ 2.1}$ ${58821.4_{ - 2.4}^{ + 2.1}}$
ω [deg]	𝒰[0, 360]	$344_{- 19}^{+ 10}$ ${344_{ - 19}^{ + 10}}$

QP-GP hyperparameters
GP amplitude (h) [km s⁻¹]	𝒰[0.0, 1.8]	${0.34}_{- 0.04}^{+ 0.03}$ ${0.34_{ - 0.04}^{ + 0.03}}$
Spot period (P_spot) [d]	𝒰[8.0, 10.0]	${9.0}_{- 0.5}^{+ 0.4}$ ${9.0_{ - 0.5}^{ + 0.4}}$
Smoothing (λ_p)	𝒰[0.1, 3.0]	${0.8}_{- 0.07}^{+ 0.09}$ ${0.8_{ - 0.07}^{ + 0.09}}$
Evol. timescale (λ_e) [d]	𝒰[50, 1500]	$446_{- 30}^{+ 33}$ ${446_{ - 30}^{ + 33}}$
White noise amplitude (σ_RV) [km s⁻¹]	𝒰[0, 1]	${0.06}_{- 0.007}^{+ 0.005}$ ${0.06_{ - 0.007}^{ + 0.005}}$

Fit report
RMS data [km s⁻¹]	–	0.50
RMS residuals [km s⁻¹]	–	0.32
Red. χ² fit	–	7.0

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