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The spin of a planet or brown dwarf is related to the accretion process, andtherefore studying spin can help promote our understanding of the formation ofsuch objects. We present the projected rotational velocity of the youngsub-stellar companion GQ Lupi b, along with its barycentric radial velocity.The directly imaged exoplanet or brown dwarf companion joins a small butgrowing ensemble of wide-orbit sub-stellar companions with a spin measurement.The GQ Lupi system was observed at high spectral resolution (R ~ 1), andin the analysis we made use of both spectral and spatial filtering to separatethe signal of the companion from that of the host star. We detect both CO(S/N=11.6) and H2O (S/N=7.7) in the atmosphere of GQ Lupi b bycross-correlating with model spectra, and we find it to be a slow rotator witha projected rotational velocity of $5.3^{+0.9}_{-1.0}$ km/s. The slow rotationis most likely due to its young age of < 5 Myr, as it is still in the processof accreting material and angular momentum. We measure the barycentric radialvelocity of GQ Lupi b to be $2.0 \pm 0.4$ km/s, and discuss the allowed orbitalconfigurations and their implications for formation scenarios for GQ Lupi b.

The slow spin of the young sub-stellar companion GQ Lupi b and its orbital configuration