Expected RV precisions of an M9.5-dwarf with a temperature of 2200 K and a projected rotational velocity of vsini = 5 km s-1 in the different NIR wavelength bands (Y, J, H and K) for different spectral resolving powers. For these simulations, we accounted for the spectral flux distribution of the M9.5-dwarf, and assumed a homogeneously sensitive detector throughout the NIR. The gray spectrum in the background represents the transmission of the Earth’s atmosphere (the value 30 in the y-axis corresponds to 100% transmission). The SNR in the brightest regions in the stellar continuum of the M-dwarf was set to be 90 for a spectral resolving power of R = 80 000. The SNR values and the RV precision values for the different wavelength bands and spectral resolving powers are given in Table 1. Although the spectral flux distribution of such a cool dwarf peaks around 1.2 μm, the highest radial velocity precision is attained in the Y band.
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