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We investigate the incidence and properties of ionized gas outflows in asample of 52 galaxies with stellar mass between $10^7$ M$_{\odot}$ and $10^9$M$_{\odot}$ observed with ultra-deep JWST/NIRSpec MSA spectroscopy as part ofthe JWST Advanced Deep Extragalactic Survey (JADES). The high-spectralresolution (R2700) NIRSpec observations allowed us to identify for the firsttime the signature of outflows in the rest-frame optical nebular lines inlow-mass galaxies at $z>3$. The incidence fraction of ionized outflows, tracedby broad components, is about 25-40$\%$ depending on the intensity of theemission lines. The low incidence fraction might be due to both the sensitivitylimit and the fact that outflows are not isotropic but have a limited openingangle which results in a detection only when this is directed toward our lineof sight. Evidence for outflows increases slightly with stellar mass andstar-formation rate. The median velocity and mass loading factor (i.e., theratio between mass outflow rate and star formation rate) of the outflowingionized gas are 500 km s$^{-1}$ and $\eta=2.1^{+2.5}_{-1.6}$, respectively.These are two and 100 times higher, respectively than the typical valuesobserved in local dwarf galaxies. These outflows are able to escape thegravitational potential of the galaxy and enrich the circum-galactic mediumand, potentially, the inter-galactic medium. Our results indicate that outflowscan significantly impact the star formation activity in low-mass galaxieswithin the first 2 Gyr of the Universe.

JADES: The incidence rate and properties of galactic outflows in low-mass galaxies across 3 < z < 9