J/ApJ/975/162ivo://CDS.VizieR/J/ApJ/975/162doi:10.26093/cds/vizier.19750162CDSLuhman K.L.Alves de Oliveira C.Baraffe I.Chabrier G.Manjavacas E.,Parker R.J.Tremblin P.2025-08-01T20:11:36Z2025-07-07T14:18:07ZCDS support team

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

cds-question@unistra.frbrown-dwarfsyoung-stellar-objectsstar-forming-regionsopen-star-clustersmorgan-keenan-classificationinfrared-astronomyspectroscopyWe have used the multiobject mode of the Near-Infrared Spectrograph (NIRSpec) on board the James Webb Space Telescope (JWST) to obtain low-resolution 1-5um spectra of 22 brown dwarf candidates in the Orion Nebula Cluster, which were selected with archival images from the Hubble Space Telescope. One of the targets was previously classified as a Herbig-Haro (HH) object and exhibits strong emission in HI, H_2_, and the fundamental band of CO, further demonstrating that HH objects can have bright emission in that CO band. The remaining targets have late spectral types (M6.5 to early L) and are young based on gravity-sensitive features, as expected for low-mass members of the cluster. According to theoretical evolutionary models, these objects should have masses that range from the hydrogen burning limit to 0.003-0.007M_{sun}_. Two of the NIRSpec targets were identified as proplyds in earlier analysis of Hubble images. They have spectral types of M6.5 and M7.5, making them two of the coolest and least massive known proplyds. Another brown dwarf shows absorption bands at 3-5um from ices containing H_2_O, CO_2_, OCN^-^, and CO, indicating that it is either an edge-on class II system or a class I protostar. It is the coolest and least massive object that has detections of these ice features. In addition, it appears to be the first candidate for a protostellar brown dwarf that has spectroscopy confirming its late spectral type.2024ApJ...975..162Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/975/162CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AJ/111/846 : Orion HST survey (O'Dell+ 1996)J/AJ/113/1733 : Orion Nebula Cluster population (Hillenbrand 1997)J/A+A/337/403 : Low-mass stars evolutionary models (Baraffe+ 1998)J/AJ/117/1375 : Orion Trapezium cluster (Simon+, 1999)J/ApJ/540/236 : KH phot. of Orion Nebula Cluster (Hillenbrand+, 2000)J/ApJ/540/1016 : K-band & NICMOS phot.: Trapezium Cluster (Luhman+, 2000)J/ApJ/573/366 : Infrared photometry of Trapezium cluster (Muench+, 2002)J/other/ARA+A/43.195 : L and T dwarf stars (Kirkpatrick, 2005)J/MNRAS/361/211 : JHK photometry of brown dwarfs in Orion (Lucas+, 2005)J/ApJS/179/249 : Low-luminosity embedded protostar population (Dunham+, 2008)J/AJ/136/2136 : HST/ACS Atlas of Great Orion Nebula proplyds (Ricci+, 2008)J/ApJS/186/111 : Spitzer observations of Taurus members (Luhman+, 2010)J/AJ/139/950 : JHKs photometry in ONC (Robberto+, 2010)J/A+A/534/A10 : HST/NICMOS III imaging in ONC (Andersen+, 2011)J/ApJ/748/14 : ONC population data from WFI observations (Da Rio+, 2012)J/AJ/146/85 : Spec. types: 1576 optical stars in ONC (Hillenbrand+, 2013)J/ApJS/207/10 : HST Treasury Program on the ONC (Robberto+, 2013)J/ApJ/782/8 : Spectroscopy of 104 objects in the ONC (Ingraham+, 2014)J/MNRAS/461/1734 : HAWK-I JHK phot. of the Orion Nebula Cloud (Drass+, 2016)J/ApJ/826/16 : ALMA & GeMS observations of the OMC1 region (Eisner+, 2016)J/A+A/587/A153 : VISION I. VISTA Orion A Survey (Meingast+, 2016)J/AJ/153/46 : Spectroscopy of candidate members in Taurus (Luhman+, 2017)J/ApJ/896/79 : HST survey: ONC in H20 1.4um abs. band. I. (Robberto+, 2020)J/AJ/163/26 : Sco-Cen memb. & sp. obs. in other clouds (Luhman+, 2022)J/A+A/657/A131 : Ten new systems with O stars (Maiz Apellaniz+, 2022)J/AJ/168/230 : Phot. substellar candidates in ONC with JWST (Luhman, 2024)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/975/162https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/975/162http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/975/162https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/975/162https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/975/162http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/975/162GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/975/162/table1 (Sources in the Orion Nebula Cluster (ONC) observed with JWST/NIRSpec)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/975/162/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/975/162/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/975/162/table1?GETtext/xml+votable180.050000true83.78355694-5.354911940.0055555555555555566/21439https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/975/162?format=asciiOpticalInfrareddefaultJ/ApJ/975/162/table1Sources in the Orion Nebula Cluster (ONC) observed with JWST/NIRSpecrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintID[67/143] Identifiermeta.id;meta.mainintONameOther name(s)meta.idcharRAJ2000[83.78/83.85] Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000[-5.4/-5.3] Declination (J2000)degpos.eq.dec;meta.mainSpTSpectral typesrc.spTypecharAK[0.03/1.6]? Extinction estimatephys.absorptionfloatnullableIRex?Infrared excess? (1)meta.code;phot.color.excess;em.IR.NIRcharspInteractive spectrum plotmeta.ref.urlcharSimbadNameSimbad column added by the CDSmeta.idcharnullable