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Fig. 5

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Expected RV precisions of hot brown dwarf with a temperature of 1800 K and a projected rotational velocity of vsini = 20 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 brown dwarf, and assumed a homogeneously sensitive detector throughout the NIR. The SNR in the brightest regions in the continuum of the brown dwarf was set to be 45 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. The gray spectrum in the background represents the transmission of the Earth’s atmosphere (the value 130 in the y-axis corresponds to 100% transmission). The highest radial velocity precision is attained in the J band.

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