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We aim at identifying very low-mass isolated planetary-mass member candidatesin the nearest OB association to the Sun, Upper Scorpius (145 pc; 5-10 Myr), toconstrain the form and shape of the luminosity function and mass spectrum inthis regime. We conducted a deep multi-band ($Y$=21.2, $J$=20.5, $Z$=22.0 mag)photometric survey of six square degrees in the central region of UpperScorpius. We extend the current sequence of astrometric and spectroscopicmembers by about two magnitudes in $Y$ and one magnitude in $J$, reachingpotentially T-type free-floating members in the association with predictedmasses below 5 Jupiter masses, well into the planetary-mass regime. Weextracted a sample of 57 candidates in this area and present infraredspectroscopy confirming two of them as young L-type members with characteristicspectral features of 10 Myr-old brown dwarfs. Among the 57 candidates, wehighlight 10 new candidates fainter than the coolest members previouslyconfirmed spectroscopically. We do not see any obvious sign of decrease in themass spectrum of the association, suggesting that star processes can formsubstellar objects with masses down to 4-5 Jupiter masses.

Exploring the planetary-mass population in the Upper Scorpius association