J/AJ/168/104ivo://CDS.VizieR/J/AJ/168/104doi:10.26093/cds/vizier.51680104CDSSchlawin E.Mukherjee S.Ohno K.Bell T.J.Beatty T.G.Greene T.P.,Line M.Challener R.C.Parmentier V.Fortney J.J.Rauscher E.,Wiser L.Welbanks L.Murphy M.Edelman I.Batalha N.Moran S.E.,Mehta N.Rieke M.2025-05-21T20:12:30Z2025-02-06T12:38:02ZCDS support team

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

cds-question@unistra.frexoplanetsinfrared-astronomyspectroscopyWASP-69 b is a hot, inflated, Saturn-mass planet (0.26M_Jup_) with a zero-albedo equilibrium temperature of 963K. Here, we report the JWST 2-12{mu}m emission spectrum of the planet consisting of two eclipses observed with NIRCam grism time series and one eclipse observed with the MIRI low-resolution spectrometer (LRS). The emission spectrum shows absorption features of water vapor, carbon dioxide, and carbon monoxide, but no strong evidence for methane. WASP-69 b's emission spectrum is poorly fit by cloud-free homogeneous models. We find three possible model scenarios for the planet: (1) a scattering model that raises the brightness at short wavelengths with a free geometric albedo parameter; (2) a cloud-layer model that includes high-altitude silicate aerosols to moderate long-wavelength emission; and (3) a two-region model that includes significant dayside inhomogeneity and cloud opacity with two different temperature-pressure profiles. In all cases, aerosols are needed to fit the spectrum of the planet. The scattering model requires an unexpectedly high geometric albedo of 0.64. Our atmospheric retrievals indicate inefficient redistribution of heat and an inhomogeneous dayside distribution, which is tentatively supported by MIRI LRS broadband eclipse maps that show a central concentration of brightness. Our more plausible models (2 and 3) retrieve chemical abundances enriched in heavy elements relative to solar composition by 6x to 14x solar and a C/O ratio of 0.65-0.94, whereas the less plausible highly reflective scenario (1) retrieves a slightly lower metallicity and lower C/O ratio.2024AJ....168..104Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/168/104CatalogResearchIsServedByTAP VizieR generic servicerelated-toVII/233 : 2MASS All-Sky Extended Source Catalog (XSC) (IPAC/UMass, 2003-2006)VI/151 : Search for radio emission from giant exoplanets (Griessmeier, 2016)J/ApJ/683/1076 : Transits of exoplanet XO-3b (Winn+, 2008)J/MNRAS/445/1114 : WASP-69b, WASP-70Ab and WASP-84b (Anderson+, 2014)J/A+A/564/A125 : AGN Torus model comparison of AGN in CDFS (Buchner+, 2014)J/AJ/153/136 : Planets and their host stars with Gaia plx (Stassun+, 2017)J/ApJ/834/17 : Mass & radius of planets & low mass stars (Chen+, 2017)J/A+A/608/A135 : Sodium detection in WASP-69b atm. (Casasayas-Barris+, 2017)J/ApJS/239/14 : Revised exoplanet radii from Gaia DR2 (Johns+, 2018)J/ApJ/874/L31 : Giant planet bulk and atm. metallicities (Thorngren+, 2019)J/A+A/630/A135 : Beyond exoplanet mass-radius relations (Ulmer-Moll+, 2019)J/A+A/641/A158 : GTC transit light curves of WASP-69b (Murgas+, 2020)J/ApJ/890/23 : NUV and FUV measurements of planet host stars (Loyd+, 2020)J/AJ/159/278 : He-filter obs. of WASP-69b & WASP-52b (Vissapragada+, 2020)J/AJ/161/174 : Transit depth biases for 31 planets (Morello+, 2021)J/ApJS/258/40 : ExoClock project. II. Exoplanet ephemerides (Kokori+, 2022)J/MNRAS/512/2062 : 10 exoplanet systems transit timing (Basturk+, 2022)J/A+A/659/L4 : Geometric albedo of HD 209458 b (Brandeker+, 2022)J/A+A/672/A24 : Geometric albedo of HD 189733b (Krenn+, 2023)J/AJ/165/104 : Emergent sp. IR fluxes of 122 hot Jupiters (Deming+, 2023)J/AJ/167/213 : Absolute Calib. IV. Bright star templates (Rieke+, 2024)J/ApJS/270/14 : Transit times of hot Jupiters from TESS (Wang+, 2024)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/168/104https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/168/104http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/168/104https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/168/104https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/168/104http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/168/104GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapInfrareddefaultJ/AJ/168/104/spCombined JWST NIRCam & MIRI eclipse depth spectrum (Data behind Figure 5 - top panel)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlambda[2.45/11.9] Wavelength, spectral element bin centerumspect.binSize;em.wldoubleWidth[0.0096/0.25] Wavelength, width of spectral elementuminstr.bandwidth;em.wlfloatDepth[-4.51e-06/0.003] Eclipse depth, fraction%phys.absorption.opticalDepth;arith.ratiodoublee_Depth[3.8e-05/0.0003] Uncertainty in Depth%stat.error;phys.absorption.opticalDepthdoubleFilterFilter or Filters used (1)meta.id;instr.filtercharJ/AJ/168/104/spbinRebinned, merged JWST eclipse depth and brightness temperature spectra (Data behind Figure 5 - middle and bottom panels)FilterFilter or Filters used (1)meta.id;instr.filtercharTb[848/1178] Brightness TemperatureKphys.temperaturefloate_Tb[8.8/66.5] Uncertainty in TbKstat.error;phys.temperaturefloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlambda[2/11.9] Wavelength, spectral element bin centerumspect.binSize;em.wldoubleWidth[0.049/0.25] Wavelength, width of spectral elementuminstr.bandwidth;em.wlfloatDepth[0.00013/0.003] Eclipse depth, fractionphys.absorption.opticalDepth;arith.ratiodoublee_Depth[2e-05/0.0003] Uncertainty in Depthstat.error;phys.absorption.opticalDepthdouble