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

CIEZA, LUCAS A; RUÍZ-RODRÍGUEZ, DARY; HALES, ANTONIO; CASASSUS, SIMON; PÉREZ, SEBASTIAN; GONZALEZ-RUILOVA, CAMILO; CÁNOVAS, HECTOR; WILLIAMS, JONATHAN P; ZURLO, ALICE; ANSDELL, MEGAN; AVENHAUS, HENNING; BAYO, AMELIA; BERTRANG, GESA H-M; CHRISTIAENS, VALENTIN; DENT, WILLIAM; FERRERO, GABRIEL; GAMEN, ROBERTO; OLOFSSON, JOHAN; ORCAJO, SANTIAGO; PEÑA RAMÍREZ, KARLA; PRINCIPE, DAVID; SCHREIBER, MATTHIAS R; VAN DER PLAS, GERRIT

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY

WILEY-BLACKWELL PUBLISHING, INC

Lugar: Londres; Año: 2019 vol. 482 p. 698 - 714

0035-8711

We introduce the Ophiuchus DIsc Survey Employing ALMA (ODISEA), aproject aiming to study the entire population of Spitzer-selectedprotoplanetary discs in the Ophiuchus Molecular Cloud (?300objects) from both millimetre continuum and CO isotopologues data. Herewe present 1.3 mm/230 GHz continuum images of 147 targets at 0.2 arcsec(28 au) resolution and a typical rms of 0.15 mJy. We detect a total of133 discs, including the individual components of 11 binary systems and1 triple system. 60 of these discs are spatially resolved. We find clearsubstructures (inner cavities, rings, gaps, and/or spiral arms) in eightof the sources and hints of such structures in another four discs. Weconstruct the disc luminosity function for our targets and performpreliminary comparisons to other regions. A simple conversion betweenflux and dust mass (adopting standard assumptions) indicates that alldiscs detected at 1.3 mm are massive enough to form one or more rockyplanets. In contrast, only ?50 discs (?1/3 of the sample)have enough mass in the form of dust to form the canonical 10M⊕ core needed to trigger runaway gas accretion and theformation of gas giant planets, although the total mass of solidsalready incorporated into bodies larger than cm scales is mostlyunconstrained. The distribution in continuum disc sizes in our sample isheavily weighted towards compact discs: most detected discs have radii< 15 au, while only 23 discs ({? }15{{ per cent}} of thetargets) have radii > 30 au.