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 3

Fitted orbital parameters of GJ 4274 planet(s).

Parameters	1p		2p		Priors

	Circular	Keplerian	Circular	Keplerian

Instrumental parameters
γ_SPIRou (m/s)	–1308.3 ±0.5	–1308.3 ± 0.5	$- {1307.7}_{- 0.6}^{+ 0.5}$ $- 1307.7_{ - 0.6}^{ + 0.5}$	–1307.5 ± 0.5	𝒰(–∞, ∞)
σ_SPIRou (m/s)	5.98 ± 0.42	5.98 ± 0.43	5.0 ± 0.4	${4.94}_{- 0.38}^{+ 0.52}$ $4.94_{ - 0.38}^{ + 0.52}$	ℒ𝒰(10^–4, 10⁴)
γ_CARMENES (m/s)	$- {2.69}_{- 1.52}^{+ 1.18}$ $- 2.69_{ - 1.52}^{ + 1.18}$	$- {2.88}_{- 2.14}^{+ 1.28}$ $- 2.88_{ - 2.14}^{ + 1.28}$	$- {2.36}_{- 2.28}^{+ 1.56}$ $- 2.36_{ - 2.28}^{ + 1.56}$	$- {2.22}_{- 1.68}^{+ 1.46}$ $- 2.22_{ - 1.68}^{ + 1.46}$	𝒰(–∞, ∞)
σ_CARMENES (m/s)	${0.26}_{- 0.40}^{+ 2.97}$ $0.26_{ - 0.40}^{ + 2.97}$	${2.23}_{- 2.21}^{+ 1.90}$ $2.23_{ - 2.21}^{ + 1.90}$	${2.29}_{- 2.29}^{+ 2.33}$ $2.29_{ - 2.29}^{ + 2.33}$	${2.43}_{- 1.72}^{+ 2.49}$ $2.43_{ - 1.72}^{ + 2.49}$	ℒ𝒰(10^–4, 10⁴)

Wapiti systematics

a₁ (m/s)	0.0	0.0	0.032 ± 0.022	0.037 ± 0.023	𝒰(–∞, ∞)

Orbital parameters

P_b (days)	1.6339 ± 0.0001	1.6339 ± 0.0001	1.6339 ± 0.0001	1.6339 ± 0.0001	ℒ𝒰(1, 10⁴)
K_b (m/s)	5.65 ± 0.80	${5.35}_{- 0.80}^{+ 0.89}$ $5.35_{ - 0.80}^{ + 0.89}$	${5.10}_{- 0.67}^{+ 0.70}$ $5.10_{ - 0.67}^{ + 0.70}$	${5.13}_{- 0.68}^{+ 0.47}$ $5.13_{ - 0.68}^{ + 0.47}$	ℒ𝒰(0, 10³)
T_b(BJD-2 457 000)	3115.053 ± 0.037	3115.054 ± 0.064	3115.047 ± 0.035	3115.037 ± 0.061	ℒ𝒰(–10⁵, 10⁵)
e_b	–	${0.002}_{- 0.002}^{+ 0.067}$ $0.002_{ - 0.002}^{ + 0.067}$	–	${0.003}_{- 0.003}^{+ 0.049}$ $0.003_{ - 0.003}^{ + 0.049}$	𝒰(0, 1)
ω_b	–	${0.543}_{- 2.416}^{+ 1.685}$ $0.543_{ - 2.416}^{ + 1.685}$	–	$- {0.21}_{- 1.47}^{+ 2.04}$ $- 0.21_{ - 1.47}^{ + 2.04}$	𝒰(–π, π)
P_c (days)	–	–	${69.57}_{- 1.14}^{+ 0.32}$ $69.57_{ - 1.14}^{ + 0.32}$	69.525 ± 0.362	ℒ𝒰(1, 10⁴)
K_c (m/s)	–	–	4.11 ± 0.64	${4.27}_{- 0.54}^{+ 0.70}$ $4.27_{ - 0.54}^{ + 0.70}$	ℒ𝒰(0, 10³)
T_c (BJD - 2 457 000)	–	–	${3097.87}_{- 2.49}^{+ 4.58}$ $3097.87_{ - 2.49}^{ + 4.58}$	${3124.60}_{- 1.28}^{+ 1.38}$ $3124.60_{ - 1.28}^{ + 1.38}$	ℒ𝒰(–10⁵, 10⁵)
e_c	–	–	–	${0.01}_{- 0.01}^{+ 0.26}$ $0.01_{ - 0.01}^{ + 0.26}$	𝒰(0, 1)
ω_c	–	–	–	${0.85}_{- 0.26}^{+ 0.22}$ $0.85_{ - 0.26}^{ + 0.22}$	𝒰(–π, π)

Statistics

BIC	903.41	913.24	882.78	900.08	–
RMS (m/s)	6.06	6.05	5.20	5.26	–

Derived parameters

M_p,b sin i (M_⊕)	3.28 ± 0.45	${3.11}_{- 0.57}^{+ 0.62}$ $3.11_{ - 0.57}^{ + 0.62}$	${2.97}_{- 0.50}^{+ 0.54}$ $2.97_{ - 0.50}^{ + 0.54}$	2.95 ± 0.49	–
a_b (au)	0.0153 ± 0.0008	0.0153 ± 0.0008	0.0153 ± 0.0008	0.0153 ± 0.0008	–
S_b (S_⊕)	14.7 ± 1.5	14.7 ± 1.5	14.7 ± 1.5	14.7 ± 1.5	–
M_p,c sin i (M_⊕)	–	–	${8.39}_{- 1.57}^{+ 1.68}$ $8.39_{ - 1.57}^{ + 1.68}$	${8.67}_{- 1.51}^{+ 1.57}$ $8.67_{ - 1.51}^{ + 1.57}$	–
a_c (au)	–	–	0.186 ± 0.010	0.187 ± 0.010	–
S_c (S_⊕)	–	–	0.100 ± 0.011	0.099 ± 0.011	–

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