J/AJ/169/225ivo://CDS.VizieR/J/AJ/169/225doi:10.26093/cds/vizier/be-59-71CDSYee S.W.Stefansson G.Thorngren D.Monson A.Hartman J.D.,Charbonneau D.B.Teske J.K.Butler R.P.Crane J.D.Osip D.,Shectman S.A.2026-07-02T11:45:38Z2026-01-16T13:12:08ZCDS support team

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

cds-question@unistra.frexoplanetsradial-velocityspectroscopyphotometryvisible-astronomyinfrared-astronomyThe "super-puffs" are a population of planets that have masses comparable to that of Neptune but radii similar to Jupiter, leading to extremely low bulk densities ({rho}p<=0.2g/cm3) that are not easily explained by standard core accretion models. Interestingly, several of these super-puffs are found in orbits significantly misaligned with their host stars' spin axes, indicating past dynamical excitation that may be connected to their low densities. Here, we present new Magellan/Planet Finder Spectrograph radial velocity measurements of WASP-193, a late F star hosting one of the least dense transiting planets known to date (M_p_=0.112_-0.034_^+0.029^M_J_, R_p_=1.319_-0.048_^+0.056^R_J_, {rho}p=0.060+/-0.019g/cm3). We refine the bulk properties of WASP-193 b and use interior structure models to determine that the planet can be explained if it consists of roughly equal amounts of metals and H/He, with a metal fraction of Z=0.42. The planet is likely substantially reinflated due to its host star's evolution, and expected to be actively undergoing mass loss. We also measure the projected stellar obliquity using the Rossiter-McLaughlin effect, finding that WASP-193 b is on an orbit well aligned with the stellar equator, with {lambda}=16_-15_^+16^degrees. WASP-193 b is the first Jupiter-sized super-puff on a relatively well-aligned orbit, suggesting a diversity of formation pathways for this population of planets.2025AJ....169..225Yhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/169/225CatalogResearchIsServedByTAP VizieR generic servicerelated-toII/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)II/311 : WISE All-Sky Data Release (Cutri+ 2012)IV/38 : TESS Input Catalog - v8.0 (TIC-8) (Stassun+, 2019)IV/39 : TESS Input Catalog version 8.2 (TIC v8.2) (Paegert+, 2021)I/355 : Gaia DR3 Part 1. Main source (Gaia Collaboration, 2022)I/357 : Gaia DR3 Part 3. Non-single stars (Gaia Collaboration, 2022)VI/120 : High-resolution synthetic stellar library (Coelho+, 2005)J/ApJS/159/141 : Spectroscopic properties of cool stars. I. (Valenti+, 2005)J/A+A/529/A75 : Limb-darkening coefficients (Claret+, 2011)J/ApJ/831/64 : Mass-metallicity relation for giant planets (Thorngren+, 2016)J/MNRAS/456/2070 : Eccentricity distribution of wide binar. (Tokovinin+, 2016)J/A+A/600/A30 : Limb-darkening for TESS satellite (Claret, 2017)J/AJ/153/96 : Standard Galactic field RR Lyrae. I. Photometry (Monson+, 2017)J/ApJS/245/13 : CDIPS. I. LCs from TESS sectors 6 and 7 (Bouma+, 2019)J/AJ/161/70 : RVs for WASP-107 with HIRES & CORALIE (Piaulet+, 2021)J/A+A/649/A3 : Gaia Early Data Release 3 photometric passbands (Riello+, 2021)J/AJ/161/119 : The TESS-Keck survey. IV. Rvel for WASP-107 (Rubenzahl+, 2021)J/ApJ/931/L15 : Obs. of two transits of GJ 3470b with NEID (Stefansson+, 2022)J/AJ/168/185 : HATS-38b & WASP-139b: LCs & RVs (Espinoza-Retamal+, 2024)J/A+A/690/A379 : Obliquities of exoplanet host stars (Knudstrup+, 2024)J/AJ/167/199 : WIRC light curves of TOI-1420b (Vissapragada+, 2024)http://archive.stsci.edu/index.html : MAST websitehttp://zenodo.org/records/4435257 : Binar. cat. from Gaia EDR3 (El-Badry+2021)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/169/225https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/169/225http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/169/225https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/169/225https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/169/225http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/169/225GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticalInfrareddefaultJ/AJ/169/225/table1PFS radial velocities for WASP-193recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJD[2460300/2460464] Barycentric Julian Date of midpoint; TDBtime.epochdoubleRVel[-57.7/63.5] Relative radial velocitym/sspect.dopplerVelocfloate_RVel[4.6/8] Uncertainty in RVelm/sstat.error;spect.dopplerVelocfloatExp[600/900] Exposure timestime.duration;obs.exposureintJ/AJ/169/225/fig1TESS light curves of WASP-193recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSectorTESS Sector identifier (1)obs.fieldcharBJD[2458549/2460040] Barycentric Julian Date; TDBdtime.epochdoubleFlux[0.98/1.01] Relative fluxphot.flux;arith.ratiodoublee_Flux[7e-4/2.6e-3] Uncertainty in Fluxstat.error;phot.fluxdoubleJ/AJ/169/225/fig4aLCRO g'-band in-transit photometric data of WASP-193recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJD[2460367/2460370] Barycentric Julian Date of midpoint; TDBdtime.epochdoubleFlux[0.96/1.01] Relative flux; LCRO g' band (477nm)phot.flux;arith.ratiodoublee_Flux[2e-3/2.2e-3] Uncertainty in Fluxstat.error;phot.fluxdoubleFlip[-0.68/1] Detrending Variable 1; Meridian Fliparith.factor;phot.fluxdoubleBJD-Norm[-0.98/1] Detrending Variable 2; Normalized BJDarith.factor;phot.fluxdoubleJ/AJ/169/225/fig4bTMMT I-band in-transit photometric data of WASP-193recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJD[2460367/2460371] Barycentric Julian Date of midpoint; TDBdtime.epochdoubleFlux[0.95/1.02] Relative flux; TMMT I-band (900nm)phot.flux;arith.ratiodoublee_Flux[2.8e-3/5.1e-3] Uncertainty in Fluxstat.error;phot.fluxdoubleFlip[-0.71/1] Detrending Variable 1; Meridian Fliparith.factor;phot.fluxdoubleBJD-Norm[-0.93/1] Detrending Variable 2; Normalized BJDarith.factor;phot.fluxdoubleX-T1[-0.76/1] Detrending Variable 3; X pixel positionarith.factor;phot.fluxdouble