The SPIRou Legacy Survey - Detection of a nearby world orbiting in the habitable zone of Gl 725B achieved by correcting strong telluric contamination in near-infrared radial velocities with wapiti

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Volume 705 (January 2026)

A&A, 705 (2026) A234

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Table 2

Comparison of the model performances for Gl 725 B using different combinations of time series.

Time series	Model	log ℒ_max	$χ_{red}^{2}$ $\[\chi_{\text {red }}^{2}\]$	BIC	log BF	RMS (m/s)
RV only	Offset + wapiti + trend	−552.04	1.050	1141.33	0	3.6
	Offset + Wapiti + Trend + 1p (circular)	−540.16	1.068	1133.55	3.9	3.4
	Offset + wapiti + trend + 2p (circular)	−530.63	1.090	1130.47	5.4	3.3
	Offset + wapiti + trend + 2p (eccentric)	−529.67	1.113	1149.83	−4.3	3.2

RV + dET	Offset + wapiti + trend	−1023.37	1.231	2100.96	−36.6	3.8
	Offset + wapiti + trend + GP (β₁ = β₂ = 0)	−971.71	0.768	2027.76	0	3.5
	Offset + wapiti + trend + GP (β₁ = β₂ = 0) + 1 p (circular)	−958.56	0.770	2019.52	4.1	3.3
	Offset + wapiti + trend + GP (β₁ = β₂ = 0) + 2p (circular)	−947.44	0.751	2015.35	6.2	3.1
	Offset + wapiti + trend + GP (β₁ = β₂ = 0) + 2p (eccentric)	−946.39	0.755	2037.35	−4.8	3.1

RV + dET + B_ℓ	Offset + wapiti + trend	−1680.02	1.754	3430.79	−34.8	3.8
	Offset + wapiti + trend + GP (β₁ = β₂ = 0)	−1622.75	1.229	3361.27	0	3.5
	Offset + wapiti + trend + GP (β₁ = β₂ = 0) + 1 p (circular)	−1609.92	1.286	3354.89	3.2	3.3
	Offset + wapiti + trend + GP (β₁ = β₂ = 0) + 2p (circular)	−1598.76	1.324	3351.86	4.7	3.1
	Offset + wapiti + trend + GP (β₁ = β₂ = 0) + 2 p (eccentric)	−1597.59	1.356	3381.69	−10.2	3.1

Notes. Maximum log-likelihood, reduced chi-squared, BIC, log BF, and RMS of the residuals for the best model applied to each combination of time series. The model in bold indicates the best-fit model to the combination of time series.

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