Searching for close-in planets around TWA 7 with SPIRou

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Table 4

Markov Chain Monte Carlo results of the RV modelling.

Parameter	No planet	Planet b (15.2 d)	Planet b^′ (20.8 d)	Planet b^′′ (30.4 d)	Prior
θ₁(m s⁻¹)	$8 . 0_{- 2.5}^{+ 3.7}$ $8.0_{-2.5}^{+3.7}$	$10 . 4_{- 2.3}^{+ 3.0}$ $10.4_{-2.3}^{+3.0}$	$9 . 7_{- 2.2}^{+ 2.9}$ $9.7_{-2.2}^{+2.9}$	$9 . 9_{- 2.1}^{+ 2.7}$ $9.9_{-2.1}^{+2.7}$	Modified Jeffreys (σ_RV)

θ₂ (d)	5.02 ± 0.15	4.96 ± 0.11	5.05 ± 0.06	5.03 ± 0.09	Gaussian (5.0; 0.3)
θ₃ (d)	$24_{- 8}^{+ 11}$ $24_{-8}^{+11}$	$28_{- 7}^{+ 9}$ $28_{-7}^{+9}$	$48_{- 13}^{+ 18}$ $48_{-13}^{+18}$	$29_{- 7}^{+ 9}$ $29_{-7}^{+9}$	log Gaussian (log 40; log 2.0)
θ₄	1.3	1.3	1.3	1.3	Fixed
θ₅(m s⁻¹)	6.1 ± 1.1	4.1 ± 0.8	5.1 ± 0.8	4.5 ± 0.8	Modified Jeffreys (σ_RV)

K_b(m s⁻¹)		$5 . 4_{- 1.0}^{+ 1.3}$ $5.4_{-1.0}^{+1.3}$	$4 . 8_{- 1.2}^{+ 1.5}$ $4.8_{-1.2}^{+1.5}$	$7 . 0_{- 1.7}^{+ 2.3}$ $7.0_{-1.7}^{+2.3}$	Modified Jeffreys (σ_RV)
P_b(d)		15.21 ± 0.02	20.83 ± 0.05	30.35 ± 0.10	Gaussian (15.2, 20.8 or 30.3; 0.3)
T_b (2459000+)		289.1 ± 0.6	295.1 ± 1.0	276.3 ± 1.2	Gaussian (289, 295, or 276; 5)
M_b sin i(M_⊕)		$12 . 5_{- 2.3}^{+ 3.0}$ $12.5_{-2.3}^{+3.0}$	$12 . 3_{- 3.1}^{+ 3.8}$ $12.3_{-3.1}^{+3.8}$	$20 . 4_{- 4.9}^{+ 6.7}$ $20.4_{-4.9}^{+6.7}$	From K_b, P_b, M_★
M_b(M₄)		$0 . 17_{- 0.03}^{+ 0.04}$ $0.17_{-0.03}^{+0.04}$	$0 . 17_{- 0.04}^{+ 0.05}$ $0.17_{-0.04}^{+0.05}$	$0 . 28_{- 0.07}^{+ 0.09}$ $0.28_{-0.07}^{+0.09}$	Assuming i=13^°
a_b(au)		0.092 ± 0.006	0.114 ± 0.007	0.147 ± 0.009

$χ_{r}^{2}$ $\chi_{r}^{2}$	10.6	3.8	7.1	5.1
rms (m s⁻¹)	4.7	2.8	3.8	3.3
log ℒ_M	174.9	186.3	182.9	183.6
Δ log ℒ_M	0.0	11.4	8.0	8.7

Notes. We list the recovered GP and parameters of the tentative planet with their error bars, as well as the priors used where relevant, for the model without planet (Column 2) and the best models with a planet (Columns 3-5). The last four rows report the $χ_{r}^{2}$ $\chi_{\mathrm{r}}^{2}$ , the rms of the best fit to the RV data, the associated logarithmic marginal likelihood, log ℒ_M, and the logarithmic marginal likelihood variation, Δ log ℒ_M, relative to the case without planet.

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