J/A+A/708/A111ivo://CDS.VizieR/J/A+A/708/A111CDSAmiot P.Berne O.Schroetter I.Robberto M.Haworth T.J.Boersma C.,Dartois E.Fuente A.Goicoechea J.R.Habart E.McCaughrean M.J.,Onaka T.Peeters E.2026-04-03T09:24:13Z2026-04-03T10:23:32ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frprotostarsinfrared-photometrystellar-radiiThe Orion Nebula Cluster (ONC) provides the closest example of ongoing star and planet formation in highly irradiated environments. In particular, it is a key region to study how ultraviolet (UV) radiation from massive stars can drive mass-loss in protoplanetary disks through photo-evaporation. Far-UV (FUV, energy 6<E<13.6eV) photons heat up the gas of the disk, forming a wind of neutral gas which is a photodissociation region (PDRs). We use the high angular resolution NIRCam images from the PDRs4All program and combine them with those of the guaranteed time observation (GTO) program 1256. From these images, we 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 Paschen alpha lines, and their near infrared spectral energy distributions (SEDs). From this information we construct a typology for ONC disks: Type I sources show an IF and DF nearly merged at the disk surface; Type II sources have their DFs at the disk surface and IFs at a distance of several 10s of astronomical units from the disk; and Type III sources also have their DF at the disk surface, but show no IF. For all types of disks, we find that PAH emission traces the PDR. We establish that the SEDs of candidate Jupiter Mass Binary Objects (JuMBOs) observed as part of the PDRs4All program are similar to the SEDs of Type III ONC disks except for one of them, 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 r_mdisk_ increases with increasing projected distance to the ionizing source d_mproj_ , following a power law r_mdisk_{prop.to} d_mproj_^0.30^, which is interpreted as evidence of the truncation of the disks by the photoevaporation (as reported in previous studies). The disk radii measured at infrared wavelengths appear larger than the disk radii measured at millimeter wavelengths, interpreted as evidence of the dust radial segregation within the disks. In agreement with theoretical models and observations of PDRs in the interstellar medium, the thermal pressure within the PDRs of ONC disk increases with the intensity of the FUV radiation field G_0_, but with a flatter slope.2026A&A...708A.111Ahttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/708/A111CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/355 : Gaia DR3 Part 1. Main source (Gaia Collaboration, 2022)J/A+A/685/A74 : PDRs4All III. JWST/NIR view of the Orion Bar (Peeters+, 2024)J/A+A/685/A75 : PDRs4All IV. Orion Bar MRS template spectra (Chown+, 2024)J/A+A/701/A111 : PDRs4All XVI. Orion Bar template spectra (Van De Putte+, 2025https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/708/A111https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/708/A111http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/708/A111https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/708/A111https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/708/A111http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/708/A111GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/708/A111/tablea1 (Position and characteristic of protoplanetary disks in the Orion Nebula Cluster)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/708/A111/tablea1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/708/A111/tablea1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/708/A111/tablea1?GETtext/xml+votable180.050000true83.7524771-5.4107850.0055555555555555566/21438-21439https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/708/A111?format=asciiInfrareddefaultJ/A+A/708/A111/tablea1Position and characteristic of protoplanetary disks in the Orion Nebula ClusterrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSourceName of the sourcemeta.id;meta.maincharRAJ2000Right Ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.maindOriCProjected distance to ionizing starpcpos.distancefloatPaa? Paschen alpha intensitym.m**-2spect.line.intensitydoublenullablee_Paa? Paschen alpha intensity errorm.m**-2stat.errordoublenullableRadDisk? Radius of the silhouette disk in F187N filterauphys.angSize;srcintnullablee_RadDisk? Radius of the silhouette disk in F187N filteraustat.errorintnullableRadIF? Radius of the ionization front in F187N filterauphys.angSize;srcintnullablee_RadIF? Radius of the ionization front in F187N filter erroraustat.errorintnullableplx? Parallax of the source (1)arcsecpos.parallax.trigfloatnullablee_plx? Parallax of the source error (1)arcsecstat.error;pos.parallaxfloatnullableDatasetDataset covering the source (2)meta.datasetcharSimbadNameSimbad column added by the CDSmeta.idcharnullable