J/A+A/708/A111 NIRCAm photometric properties of ONC disks (Amiot+, 2026)
PDRs4All XVIII. JWST-NIRCam photometric properties of protoplanetary disks in
the Orion Nebula Cluster.
Amiot 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.
<Astron. Astrophys. 708, A111 (2026)>
=2026A&A...708A.111A 2026A&A...708A.111A (SIMBAD/NED BibCode)
ADC_Keywords: Protostars ; Photometry, infrared ; Stars, diameters
Keywords: methods: observational - techniques: photometric -
protoplanetary disk - HII region - infrared: ISM -
infrared: planetary system
Abstract:
The 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 rmdisk increases with
increasing projected distance to the ionizing source dmproj ,
following a power law rmdisk∝ dmproj0.30, 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 G0, but with a flatter
slope.
Description:
We use the JWST-NIRCam images from the GTO 1256 and ERS-PDRS4All
programs to extract the photometric properties of the sources, such as
the Paschen alpha intensity. We also measure the disk and ionization
front radii of the protoplanetary disks in the Orion Nebula Cluster.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 91 191 Position and characteristic of protoplanetary
disks in the Orion Nebula Cluster
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See also:
I/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+, 2025
Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Source Name of the source
10- 19 F10.7 deg RAdeg Right Ascension (J2000)
21- 30 F10.7 deg DEdeg Declination (J2000)
32- 35 F4.2 pc dOriC Projected distance to ionizing star
37- 44 E8.3 m/m2 Paa ?=- Paschen alpha intensity
46- 53 E8.3 m/m2 e_Paa ?=- Paschen alpha intensity error
55- 57 I3 au RadDisk ?=- Radius of the silhouette disk in
F187N filter
59- 60 I2 au e_RadDisk ?=- Radius of the silhouette disk in
F187N filter
62- 64 I3 au RadIF ?=- Radius of the ionization front in
F187N filter
66- 67 I2 au e_RadIF ?=- Radius of the ionization front in
F187N filter error
69- 72 F4.2 arcsec plx ?=- Parallax of the source (1)
74- 77 F4.2 arcsec e_plx ?=- Parallax of the source error (1)
79- 91 A13 --- Dataset Dataset covering the source (2)
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Note (1): from Gaia DR3 catalog (2023A&A...674A...1G 2023A&A...674A...1G, cat. I/355).
Note (2): PDRs4All dataset is module A, B, and Parallel A, B.
GTO is for GTO 1256 dataset.
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Acknowledgements:
Paul Amiot, paul.amiot(at)utoulouse.fr
References:
Berne et al., Paper I 2022PASP..134e4301B 2022PASP..134e4301B
Habart, et al., Paper II 2024A&A...685A..73H 2024A&A...685A..73H
Peeters et al., Paper III 2024A&A...685A..74P 2024A&A...685A..74P, Cat. J/A+A/685/A74
Chown et al., Paper IV 2024A&A...685A..75C 2024A&A...685A..75C, Cat. J/A+A/685/A75
Elyajouri et al., Paper V 2024A&A...685A..76E 2024A&A...685A..76E
Pasquini et al., Paper VI 2024A&A...685A..77P 2024A&A...685A..77P
Schroetter et al. Paper VII 2024A&A...685A..78S 2024A&A...685A..78S
Van De Putte et al., Paper VIII 2024A&A...687A..86V 2024A&A...687A..86V
Fuente et al., Paper IX 2024A&A...687A..87F 2024A&A...687A..87F
Goicoechea et al., Paper X 2024A&A...689L...4G 2024A&A...689L...4G
Zannese et al., Paper XI 2025A&A...696A..99Z 2025A&A...696A..99Z
Goicoechea et al., Paper XII 2025A&A...696A.100G 2025A&A...696A.100G
Chown et al., Paper XIIII 2025A&A...698A..86C 2025A&A...698A..86C
Khan et al., Paper XIV 2025A&A...699A.133K 2025A&A...699A.133K
Schroetter et al., Paper XV 2025A&A...699L..13S 2025A&A...699L..13S
Van De Putte et al., Paper XVI 2025A&A...701A.111V 2025A&A...701A.111V, Cat. J/A+A/701/A111
Zannese et al., Paper XVII 2026A&A...705A.128Z 2026A&A...705A.128Z
(End) Patricia Vannier [CDS] 18-Feb-2026