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We introduce the "Supersonic Project," aimed at investigating the effects ofthe supersonic relative velocity between dark matter (DM) and baryons at highredshift using a combination of analytical calculations and cosmologicalsimulations. In this paper, we study the effect of this stream velocity on theangular momentum of the first structures in the early Universe usingsimulations. We focus on DM haloes and their gas component as well as therecently predicted supersonically-induced gas objects (SIGOs) that arise as aresult of the stream velocity phase shift. We find that the spin parameter ofthe gas component in these first haloes is increased with the stream velocity.Moreover, we find that when the stream velocity is taken into account, theangular momentum vectors of the DM component and the gas component aretypically misaligned and this misalignment angle has a nearly isotropicdistribution. The spin parameter value of the gas component is higher than inthe no stream velocity case, which even in the absence of cooling, may resultin more prolate objects. We also generalize the spin parameter to the SIGOs andfind that they typically have a larger spin parameter with respect to theirdark matter counterparts and that there is no correlation of the spin parameterand the prolateness of such structures. We speculate that SIGOs may be observedas very low luminosity objects in the early Universe and may serve as potentialprogenitors of Little Blue Dot-like systems.

The Supersonic Project: rotational effects of supersonic motions on the first structures in the Universe