J/A+A/702/A4ivo://CDS.VizieR/J/A+A/702/A4doi:10.26093/cds/vizier/bc-ny/leCDSGodoy N.Choquet E.Serabyn E.Malin M.Tremblin P.Danielski C.,Lagage P.O.Boccaletti A.charnay B.Ressler M.E.2026-08-03T06:58:25Z2025-09-30T09:44:00ZCDS support team

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

cds-question@unistra.frmultiple-starsexoplanetsinfrared-astronomykappa And b is a substellar companion with a mass near the planet-brown dwarf boundary orbiting a B9IV star at ~50-100au. Estimates of its age and mass vary, which has fueled a decade-long debate. Additionally, the atmospheric parameters (Teff 1650-2050K and log(g) 3.5-5.5dex) remain poorly constrained. The differences in atmospheric models and inhomogeneous datasets contribute to the varied interpretations. We aim to refine the characterization of kappa And b by using mid-infrared data to capture its full bolometric emission. Combined with near-infrared (NIR) measurements, we aim to constrain Teff, log(g), and the radius to narrow down the uncertainties in age and mass. We obtained JWST/MIRI coronagraphic data in the F1065C, F1140C, and F1550C filters and recalibrated existing NIR photometry using an updated ATLAS stellar model. We used MIRI color-magnitude diagrams to probe the likelihood of species (e.g., CH_4_, NH_3_, and silicates). We compared the H and F1140C colors and magnitudes of the companion to isochrones to constrain the age and mass. We then modeled its spectral energy distribution with atmospheric models to refine the estimates of Teff, radius, and log(g) and to constrain age and mass using evolutionary models. Cloudy atmosphere models fit the spectral energy distribution of kappa And b best. This is consistent with its L0/L2 spectral type and its position near silicate- atmosphere field objects in the MIRI color-magnitude diagram. We derived an age of 47+/-7Myr and a mass of 17.3+/-1.8MJup by weight-mean combining the models. Atmospheric modeling yielded Teff=1791+/-68K and a radius of 1.42+/-0.06RJup . This improves the precision by ~ 30% over previous estimates. Log(g) was constrained to 4.35+/-0.07dex, which is an improvement in the precision by ~70% relative to the most precise literature value of 4.75+/-0.25 dex. Our new mass estimate places kappa And b slightly above the planet-brown dwarf boundary determined by the deuterium-burning limit. Our age estimate is ~75% more precise than previous values and aligns the object with the Columba association (42Myr). The derived Teff suggests silicate clouds, but this needs to be confirmed spectroscopically. MIRI data were crucial to refine the radius and temperature, which led to stronger constraints on the age and mass (both dependent on the model) and improved the overall characterization of kappa And b.2025A&A...702A...4Ghttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/702/A4CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AJ/160/207 : OSIRIS K-band spectroscopy of kappa And b (Wilcomb+, 2020)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/702/A4https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/702/A4http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/702/A4https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/702/A4https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/702/A4http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/702/A4GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/702/A4/list (List of fits images and maps)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/702/A4/list?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/702/A4/list?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/702/A4/list?GETtext/xml+votable180.050000true356.1029544.333790.005555555555555556Associated datahttps://cdsarc.cds.unistra.fr/assocdata/?obs_collection=J/A+A/702/A46/13654-13655 13683https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/702/A4?format=asciiInfrareddefaultJ/A+A/702/A4/curecCurrie et al. (2018AJ....156..291C) re-calibrated data in erg/s/cm^2^/{AA}lambdaWavelengthumem.wldoublerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFluxFlux (in erg/s/cm^2^/{AA})10mW.m**-2.nm**-1phot.fluxdoublee_FluxFlux uncertainty (in erg/s/cm^2^/{AA})10mW.m**-2.nm**-1stat.error;phot.fluxdoubleJ/A+A/702/A4/hirecHinkley et al. (2013ApJ...779..153H) re-calibrated data in erg/s/cm^2^/{AA}recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlambdaWavelengthumem.wldoubleFluxFlux (in erg/s/cm^2^/{AA})10mW.m**-2.nm**-1phot.fluxdoublee_FluxFlux uncertainty (in erg/s/cm^2^/{AA})10mW.m**-2.nm**-1stat.error;phot.fluxdoubleJ/A+A/702/A4/strecStone et al. (2020AJ....160..262S) re-calibrated data in erg/s/cm^2^/{AA}recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlambdaWavelengthumem.wldoubleFluxFlux (in erg/s/cm^2^/{AA})10mW.m**-2.nm**-1phot.fluxdoublee_FluxFlux uncertainty (in erg/s/cm^2^/{AA})10mW.m**-2.nm**-1stat.error;phot.fluxdoubleJ/A+A/702/A4/wirecWilcomb et al. (2020AJ....160..207W) re-calibrated data in erg/s/cm^2^/{AA}recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlambdaWavelengthumem.wldoubleFluxFlux (in erg/s/cm^2^/{AA})10mW.m**-2.nm**-1phot.fluxdoublee_FluxFlux uncertainty (in erg/s/cm^2^/{AA})10mW.m**-2.nm**-1stat.error;phot.fluxdoubleJ/A+A/702/A4/magAll magnitudes re-calibratedrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFiltFilter namemeta.id;instr.filtercharlambdaCental filter wavelengthumem.wl;instr.filterfloatmagMagnitude in Filter (Vega_system)magphot.magfloate_magMagnitude in Filter uncertainty (Vega_system)magstat.error;phot.magfloatused[0/1] Used datameta.codeintPaperReference paper of the calibrated data (1)meta.bibcharZP? Zero Point of each filter (in erg/s/cm^2^/{AA})10mW.m**-2.nm**-1phot.mag;arith.zpdoublenullableZPjy? Zero Point of each filter (in Jy)Jyphot.mag;arith.zpfloatnullableJ/A+A/702/A4/contrastContrast curve for F1065C, F1140C and F1550CrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFilt[F1065C F1140C F1550C] Filtermeta.id;instr.filtercharSepAngular separationarcsecpos.angDistancedoublecontrastorimag5-sigma contrast in magnitudes - originalmagphot.magdoublecontrastsmomag5-sigma contrast in magnitudes - smoothedmagphot.magdoublecontrastori5-sigma contrast - originalphot.magdoublecontrastsmo5-sigma contrast - smoothedphot.magdoubleJ/A+A/702/A4/atmoSensitivity curve in mass for F1065C, F1140C and F1550C using ATMOceqrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFilt[F1065C F1140C F1550C] Filtermeta.id;instr.filtercharSepAngular separationarcsecpos.angDistancedoubleMassSensitivity curve in mass(1.898187x10+27kg)phys.massdoublee_MassUncertainty in the sensitivity curve in mass(1.898187x10+27kg)stat.error;phys.massdoubleJ/A+A/702/A4/dustySensitivity curve in mass for F1065C, F1140C and F1550C using DUSTY-Linder2019recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFilt[F1065C F1140C F1550C] Filtermeta.id;instr.filtercharSepAngular separationarcsecpos.angDistancedoubleMassSensitivity curve in mass(1.898187x10+27kg)phys.massdoublee_MassUncertainty in the sensitivity curve in mass(1.898187x10+27kg)stat.error;phys.massdoubleJ/A+A/702/A4/listList of fits images and mapsRAJ2000Right 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.numberintsizeSize of FITS fileKibytephys.size;meta.fitsintFileNameName of FITS file, in subdirectory fitsmeta.id;meta.fitscharTitleTitle of the FITS filemeta.title;meta.fitscharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint