Estimating fundamental parameters of nearby M dwarfs from SPIRou spectra

ABSTRACT We present the results of a study aiming at retrieving fundamental parameters M dwarfs from spectra secured with SPIRou, near-infrared high-resolution spectropolarimeter installed Canada–France–Hawaii Telescope (CFHT), in framework SPIRou Legacy Survey (SLS). Our relies on comparing observed two grids synthetic spectra, respectively, computed PHOENIX and MARCS model atmospheres, ultimate goal optimizing precision which can be determined. In this first step, we applied our technique to 12 inactive effective temperatures (Teff) ranging 3000 4000 K. implemented benchmark carry out comparison models used study. report that choice has significant impact may lead discrepancies derived 30 K Teff 0.05 dex 0.10 surface gravity (log g) metallicity ($\rm {[M/H]}$), as well systematic shifts up 50 0.4 log g $\rm {[M/H]}$. The analysis is performed high signal-to-noise ratio template averaged over multiple observations corrected telluric absorption features sky lines, using both transmission principal component analysis. With models, retrieve Teff, g, {[M/H]}$ estimates good agreement reference literature studies, internal error bars about K, dex, 0.1 respectively.