A reliable activity proxy in SPIRou spectra of M dwarfs using machine learning

Open Access

Table 2

Summary of the filtering process results.

Target	AU Mic	EV Lac	GJ1289	GJ1286	Gl 410	Toy Model
Considered lines	8800	14826	15841	16783	15022	14758
Initial correlation with 〈B〉	0.93	0.61	0.06	0.41	0.21	0.52^a
Initial P_rot log FAP	−49.8	−7.9	−0.8	−23.4	0.0	−9.5
Lines removed	4684	5928	3914	4200^c	3730	657
Final correlation with 〈B〉	0.93	0.96	0.83	0.89	0.80	0.88^a
Final P_rot log FAP	−51.2	−59.4	−39.6	−20.1^b,d	−11.6^b	−71.3

Notes. ^(a) Correlation with the injected activity signal. ^(b) The W₁ signal has been detrended beforehand. ^(c) For this star, an additional weighting ratio has been used for the SVM. ^(d) P_rot/2.

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