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We introduce the Ophiuchus DIsc Survey Employing ALMA (ODISEA), a projectaiming to study the entire population of Spitzer-selected protoplanetary discsin the Ophiuchus Molecular Cloud (~300 objects) from both millimeter continuumand CO isotopologues data. Here we present 1.3 mm/230 GHz continuum images of147 targets at 0.2" (28 au) resolution and a typical rms of 0.15 mJy. We detecta total of 133 discs, including the individual components of 11 binary systemsand 1 triple system. Fifty-three of these discs are spatially resolved. We findclear substructures (inner cavities, rings, gaps, and/or spiral arms) in 8 ofthe sources and hints of such structures in another 4 discs. We construct thedisc luminosity function for our targets and perform comparisons to otherregions. A simple conversion between flux and dust mass (adopting standardassumptions) indicates that all discs detected at 1.3 mm are massive enough toform one or more rocky planets. In contrast, only ~50 discs (~1/3 of thesample) have enough mass in the form of dust to form the canonical 10 M_Earthcore needed to trigger runaway gas accretion and the formation of gas giantplanets, although the total mass of solids already incorporated into bodieslarger than cm scales is mostly unconstrained. The distribution in continuumdisc sizes in our sample is heavily weighted towards compact discs: mostdetected discs have radii < 15 au, while only 23 discs (~15% of the targets)have radii > 30 au.

The Ophiuchus DIsc Survey Employing ALMA (ODISEA) - I : project description and continuum images at 28 au resolution