M-dwarfs are the most abundant stars in our galaxy and interesting targets for exoplanet surveys. Dedicated radial velocity (RV) surveys of M-dwarfs are being performed by the spectrographs SOPHIE and SPIRou, in the optical and near-infrared regimes, respectively. Both aim to search and characterize small planets around nearby M-dwarfs. Currently, the main limitation to detect these planets around M-dwarfs is the presence of stellar activity. Magnetic chromospheric effects introduce spurious RV signals that hamper the detection of exoplanets. In the optical regime, the H_\alpha index has been the standard for disentangling the stellar activity and the planet signals. However, the nIR domain lacks good independent spectral activity indicators, thus the importance of combining optical and nIR data to constrain chromospheric effects. From the photometric side, TESS provides a unique opportunity to study the rotational modulated variability of M-dwarfs. Combining SOPHIE and SPIRou spectra, and TESS photometry, we aim to characterize the stellar activity of the active M-dwarf Gl205. We will present our results on constraining the rotational period, the sources of variability, and our search for new activity indicators in the nIR.

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