Optical and near-infrared stellar activity characterization of the early M dwarf Gl 205 with SOPHIE and SPIRou

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Volume 673 (May 2023)

A&A, 673 (2023) A14

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Table E.1

Best-fit hyperparameters of the GP model using a quasi-periodic kernel in the SOPHIE and SPIRou activity indicators.

	SOPHIE Posteriors					SPIRou Posteriors
Parameter	FWHM	contrast	BIS	S index	H_α	FWHM_lbl	chromatic velocity slope	pEW K	pEW Ti	pEW Al	pEW Fe	pEW He
	kms⁻¹	% CCF	ms⁻¹			kms⁻¹	ms⁻¹	Å	Å	Å	Å	Å
mean value μ	4.82 ± 0.02	21.6 ± 0.3	11.7 ± 0.9	1.73 ± 0.6	0.265 ± 0.005	5.945 ± 0.005	−1.1 ±3.6	0.403 ± 0.005	0.289 ± 0.002	1.48 ± 0.02	0.71 ± 0.01	0.83 ± 0.01
jitter σ	0.04 ± 0.05	0.37 ± 0.05	1.8 ± 0.8	0.09 ± 0.01	0.007 ± 0.001	0.021 ± 0.002	4.9 ± 0.5	0.0111 ±0.0008	0.008 ± 0.001	0.043 ± 0.004	0.011 ± 0.001	0.039 ± 0.003
amplitude α	0.04 ± 0.01	0.63 ±0.16	2.3 ± 1.1	0.14 ± 0.4	0.014 ± 0.003	0.015 ± 0.005	8.7 ± 2.0	0.013 ± 0.004	0.005 ± 0.002	0.08 ± 0.02	0.015 ± 0.003	0.03 ± 0.01
decay time I [d]	82 ± 36		96 ± 38					62 ± 24	81 ± 35		41 ± 8	77 ± 35
smoothing factor β	1.5 ± 0.4	1.6 ± 0.3	0.7 ± 0.5	1.4 ± 0.4	0.7 ± 0.3	0.5 ± 0.4	1.3 ± 0.4	1.5 ± 0.4	1.3 ± 0.5	0.6 ± 0.2	1.7 ± 0.3	1.2 ± 0.6
rotation period P_rot [d]	32.1 ± 3.9	37.4 ± 3.5	36.7 ± 3.5	33.8 ± 4.4	37 ± 2.3	36.7 ± 4.1	37.1 ± 4.5	42.2 ± 4.9	37.1 ± 6.3	37.9 ± 2.1	36.9 ± 7.0	27.0 ± 4.9
RMS of residuals	0.03	0.31	2.8	0.07	0.005	0.02	5.6	0.01	0.01	0.04	0.01	0.04
χ²	12.1	10.7	1.3	1.8	23.4	7.1	2.7	63.6	23.1	282	28.6	158.5

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