J/MNRAS/502/6117ivo://CDS.VizieR/J/MNRAS/502/6117doi:10.26093/cds/vizier.75026117CDSChristiaens V.Ubeira-Gabellini M.-G.Canovas H.Delorme P.Pairet B.,Absil O.Casassus S.Girard J.H.Zurlo A.Aoyama Y.Marleau G.-D.,Spina L.Van Der Marel N.Cieza L.Lodato G.Perez S.Pinte C.,Price D.J.Reggiani M.2024-08-21T20:17:20Z2021-04-30T06:57:37ZCDS support team

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

cds-question@unistra.fryoung-stellar-objectsexoplanetsprotostarsinfrared-astronomyspectroscopyUnderstanding how giant planets form requires observational input from directly imaged protoplanets. We used VLT/NACO and VLT/SPHERE to search for companions in the transition disc of 2MASS J19005804-3645048 (hereafter CrA-9), an accreting M0.75 dwarf with an estimated age of 1-2Myr. We found a faint point source at ~0.7-arcsec separation from CrA-9 (~108au projected separation). Our 3-epoch astrometry rejects a fixed background star with a 5{sigma} significance. The near-IR absolute magnitudes of the object point towards a planetary-mass companion. However, our analysis of the 1.0-3.8um spectrum extracted for the companion suggests it is a young M5.5 dwarf, based on both the 1.13um Na index and comparison with templates of the Montreal Spectral Library. The observed spectrum is best reproduced with high effective temperature (3057^+119^_-36_K) BT-DUSTY and BT-SETTL models, but the corresponding photometric radius required to match the measured flux is only 0.60^+0.01^_-0.04_ Jovian radius. We discuss possible explanations to reconcile our measurements, including an M-dwarf companion obscured by an edge-on circum-secondary disc or the shock-heated part of the photosphere of an accreting protoplanet. Follow-up observations covering a larger wavelength range and/or at finer spectral resolution are required to discriminate these two scenarios.2021MNRAS.502.6117Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/502/6117CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/502/6117https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/502/6117http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/502/6117https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/502/6117https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/502/6117http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/502/6117GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/502/6117/images (List of post-processed fits images)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/502/6117/images?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/502/6117/images?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/502/6117/images?GETtext/xml+votable180.050000true285.24184-36.751350.005555555555555556Associated datahttps://cdsarc.cds.unistra.fr/assocdata/?obs_collection=J/MNRAS/502/61176/47828https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/502/6117?format=asciiInfrareddefaultJ/MNRAS/502/6117/spectraList of fits spectraspShow spectrummeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRow1Quantity in the first row of the fits arraymeta.id;stat.fit.paramcharUnits1Units of the first row of the fits arraymeta.unitcharRow2Quantity in the second rowmeta.id;stat.fit.paramcharUnits2Units of the second rowmeta.unitRow3Quantity in the third rowmeta.id;stat.fit.paramcharUnits3Units of the third rowmeta.unitRow4Quantity in the fourth rowmeta.id;stat.fit.paramcharUnits4Units of the fourth rowmeta.unitGOFlabelGoodness of fit indicatormeta.id;stat.fit.paramcharGOFvalueValue of the goodness of fit indicatorstat.fit.goodnessfloatsizeSize of the fits fileKibytephys.size;meta.fitsintFileNameFITS filename in subdirectory spmeta.id;meta.filecharTitleTitle of the filemeta.title;meta.filecharJ/MNRAS/502/6117/imagesList of post-processed fits imagesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right ascension of center (J2000)degpos.eq.ra;meta.mainDEJ2000Declination of center (J2000)degpos.eq.dec;meta.mainNxNumber of pixels along X-axismeta.numberintNyNumber of pixels along Y-axismeta.numberintscalePlate scalearcsec/pixinstr.scale;instr.platedoublesizeSize of the fits fileKibytephys.size;meta.fitsintFileNameFITS filename in subdirectory fitsmeta.id;meta.fitscharTitleTitle of the filemeta.title;meta.filechar