SPIRou detects two planets around the nearby M4.5V star GJ 4274

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Volume 705 (January 2026)

A&A, 705 (2026) A243

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Table C.1

Prior and posterior fits of a multivariate GP on RV and dTemp with 2 planets on circular orbits.

Parameters	Posterior	Priors
Instrumental Parameters
γ_RV (m/s)	-1308.0 ± 1.8	𝒰(–1822.2, –788.7)
σ_RV (m/s)	${4.67}_{- 0.34}^{+ 0.36}$ $4.67_{ - 0.34}^{ + 0.36}$	𝒰(0,1000)

γ_dTemp (K)	${0.1}_{- 2.7}^{+ 2.5}$ $0.1_{ - 2.7}^{ + 2.5}$	𝒰(-835.8,798.8)
σ_dTemp (K)	${2.41}_{- 0.16}^{+ 0.18}$ $2.41_{ - 0.16}^{ + 0.18}$	𝒰(0,1000)

Orbital Parameters

P_b (days)	1.6338 ± 0.0002	𝒰(1.5,2.0)
K_b (m/s)	4.85 ± 0.63	𝒰(0,1000)
T_b (BJD-2400 000)	60115.47 ± 0.04	𝒰(60115,60116)

P_c (days)	${68.95}_{- 0.34}^{+ 0.39}$ $68.95_{ - 0.34}^{ + 0.39}$	𝒰(60,75)
K_c (m/s)	4.30 ± 0.63	𝒰(0,1000)
T_c (BJD-2400 000)	${60048.75}_{- 2.72}^{+ 2.52}$ $60048.75_{ - 2.72}^{ + 2.52}$	𝒰(60050,60110)

Stellar Activity HyPerParameters

P_rot (days)	4.601 ± 0.013	𝒩 (4.6,0.2)
λ_e (days)	200	200 (fixed)
λ_p	${1.71}_{- 0.42}^{+ 0.47}$ $1.71_{ - 0.42}^{ + 0.47}$	𝒩 (1.5,0.4)

A_rv (m/s)	${3.3}_{- 1.2}^{+ 1.7}$ $3.3_{ - 1.2}^{ + 1.7}$	𝒰(-1000,1000)
B_rv (m/s)	${-1.33}_{- -1.21}^{+ 0.99}$ $-1.33_{ - 1.21}^{ + 0.99}$	𝒰(-1000,1000)
A_dTemp (K)	${5.1}_{- 1.5}^{+ 2.1}$ $5.1_{ - 1.5}^{ + 2.1}$	𝒰(0,1000)

Statistics

RMS_RV (m/s)	4.86
RMSdTemp (K)	2.339
$χ_{r e d}^{2}$ $\chi _{red}^2$	0.978

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