P. Amiot, O. Berné, I. Schroetter, M. Robberto, T. J. Haworth, C. Boersma, E. Dartois, A. Fuente, J. R. Goicoechea, E. Habart, M. J. McCaughrean, T. Onaka, E. Peeters

The Orion Nebula Cluster (ONC) provides the closest example of star and planet formation in highly irradiated environments. It is a key region to study how UV radiation from massive stars drive mass-loss in protoplanetary disks through photoevaporation. Far-UV photons (6<E<13.6 eV) heat up the gas of the disk, forming a photodissociation region (PDRs). We use the NIRCam images from the PDRs4All program combined with those of the GTO program 1256 to extract key information on ONC disks. Specifically, the radii of the disks observed in silhouette against the bright background , the presence and positions of the dissociation fronts (DFs), the presence and positions of ionization fronts (IFs), intensities of Pa $α$ lines, and their near IR SEDs. From those, we construct a typology for ONC disks: Type I show an IF and DF nearly merged at the disk surface; Type II have their DFs at the disk surface and IFs at a distance of several 10s of astronomical units from the disk; and Type III also have their DF at the disk surface, but show no IF. For all disks, we find that PAH emission traces the PDR. We establish that the SEDs of candidate JuMBOs observed as part of the PDRs4All program are similar to the SEDs of Type III ONC disks except for JuMBO24, which is of Type I or II. A detailed look at this SED shows it is compatible with a young low mass binary star with an unresolved ionized disk : a microproplyd binary. We observe that the disk radius of ONC disks increases with increasing projected distance to the ionizing source interpreted as evidence of the truncation of the disks by the photoevaporation. The disk radii measured at IR wavelengths appear larger than at millimeter wavelengths, interpreted as evidence of the dust radial segregation within the disks. The thermal pressure within the PDRs of ONC disk increases with the FUV radiation field, but with a flatter slope.