J/AJ/171/20ivo://CDS.VizieR/J/AJ/171/20CDSBarber M.G.Mann A.W.Vanderburg A.Barkaoui K.Collins K.A.,Carrazco-Gaxiola S.Evans P.Fields M.J.Gillon M.Henry T.J.,Hesse K.M.Jao W.-C.Jehin E.Jenkins S.Johns T.Rodriguez D.R.,Schwarz R.P.Storch W.C.Watkins C.N.Wilkin F.P.2026-05-04T07:43:19Z2026-04-15T12:26:34ZCDS support team

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

cds-question@unistra.frexoplanetsphotometryvisible-astronomyinfrared-astronomyspectroscopyyoung-stellar-objectsopen-star-clustersradial-velocityThe discovery of infant (<50Myr), close-in (<30-day-period) planets is vital in understanding the formation mechanisms that lead to the distribution of mature transiting planets as discovered by Kepler. Despite several discoveries in this age bin, the sample is still too small for a robust statistical comparison to older planets. Here we report the validation of TOI-6448b, an 8.8+/-0.8R_{Earth}_ planet on a 14.8-day orbit. TOI-6448 was previously identified to be a likely member of Vela Population IV. We confirm the star's membership and rederive the age of the cluster using isochrones, variability, and gyrochronology. We find the star, and thus planet, to be 34+/-3Myr. Like other young planets, TOI-6448 b lands in a region of parameter space with few older planets. While just one data point, this fits with prior findings of an excess of 5-11R_{Earth}_ planets around young stars far beyond what can be explained by reduced sensitivity at young ages. Our ongoing searches of Vela, Taurus-Auriga, Sco-Cen, and Orion are expected to reveal dozens more <50Myr transiting planets.2026AJ....171...20Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/171/20CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/328 : AllWISE Data Release (Cutri+ 2013)II/358 : SkyMapper Southern Sky Survey. DR1.1 (Wolf+, 2018)I/357 : Gaia DR3 Part 3. Non-single stars (Gaia Collaboration, 2022)II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)J/ApJS/101/117 : UBVRIJHKLMNQ photometry in Taurus-Auriga (Kenyon+ 1995)J/A+A/558/A53 : MW global surv. of star clusters. II. (Kharchenko+, 2013)J/ApJ/779/188 : Spectra of nearby late K and M Kepler stars (Mann+, 2013)J/MNRAS/443/2561 : CONCH-SHELL catalog of nearby M dwarfs (Gaidos+, 2014)J/ApJ/825/19 : Mass-rad. relationship for planets with Rp<4 (Wolfgang+, 2016)J/AJ/154/224 : Transiting planets in young clusters from K2 (Rizzuto+, 2017)J/AJ/155/225 : M dwarf stars rotat. broadening measurements (Kesseli+, 2018)J/AJ/156/259 : Robo-AO detected close binaries in Gaia DR2 (Ziegler+, 2018)J/A+A/623/A108 : Age of 269 GDR2 open clusters (Bossini+, 2019)J/A+A/626/A17 : Young population in Vela-Puppis region (Cantat-Gaudin+, 2019)J/AJ/160/108 : Gaia-Kepler stellar properties cat. II. Planets (Berger+, 2020)J/ApJ/903/96 : The {mu}Tau Association (MUTA) (Gagne+, 2020)J/AJ/160/279 : Untangling the Gal. II. Structure within 3kpc (Kounkel+, 2020)J/A+A/650/A66 : DS Tuc A radial velocity curve (Benatti+, 2021)J/AJ/162/176 : The solar neighborhood. XLVIII. (Paredes+, 2021)J/A+A/649/A3 : Gaia EDR3 photometric passbands (Riello+, 2021)J/AJ/161/171 : THYME. V. Discov. a new stellar association (Tofflemire+, 2021)J/AJ/164/215 : Candidate members of Cep-Her, RSG-5 and CH-2 (Bouma+, 2022)J/AJ/163/247 : HIRES, PEPSI & TRES radial vel. of V1298 Tau (Johnson+, 2022)J/ApJS/259/33 : Faint-star TOIs from TESS Primary Mission (Kunimoto+, 2022)J/other/Sci/377.1211 : RV and LC of 8 M dwarf stars with planets (Luque+, 2022)J/AJ/163/156 : THYME. VI. TOI-1227 radial velocity (Mann+, 2022)J/ApJ/931/156 : 3D morph. of open clusters with Gaia EDR3. II. (Pang+, 2022)J/AJ/166/62 : New HIRES radial velocity data for V1298 Tau (Blunt+, 2023)J/ApJS/265/12 : Neighboring open clusters with Gaia DR3 (Qin+, 2023)J/A+A/675/A68 : ML tool for open cluster membership (van Groeningen+, 2023)J/AJ/165/85 : THYME. IX. MELANGE-4 association members (Wood+, 2023)J/AJ/168/41 : THYME. X. MELANGE-5 association cand. members (Thao+, 2024)J/AJ/168/297 : JWST transmission spectrum of HIP 67522b (Thao+, 2024)J/AJ/167/210 : <200Myr planet's hosts TESS parameters (Vach+, 2024)J/AJ/170/32 : LCs & comoving stars of TOI-2076 from TESS (Barber+, 2025)http://archive.stsci.edu/missions-and-data/tess : MAST archive for TESShttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/171/20https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/171/20http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/171/20https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/171/20https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/171/20http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/171/20GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/171/20/table7 (Candidate comoving stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/171/20/table7?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/171/20/table7?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/171/20/table7?GETtext/xml+votable180.050000true110.021621-33.8916940.0055555555555555564/2483 5/9923-9924 9926-9927 9929 9931 9956-9957 6/39638-39639 39646 39684-39685 39689 39700 39712 39721 39723 39754 39809-39813 39815 39820 39822-39823 39832-39833 39835-39836 398381.9867573869263685e-19 3.916500758235022e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/171/20?format=asciiOpticalInfrareddefaultJ/AJ/171/20/table7Candidate comoving starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGaiaDR3Gaia DR3 (I/355) source identifiermeta.id;meta.mainRAJ2016Right ascension (J2016)degpos.eq.ra;meta.mainDEJ2016Declination (J2016)degpos.eq.dec;meta.mainGmag[5.37/20.26] Gaia G-band apparent magnitudemagphot.mag;em.opt.VfloatBP-RP[-0.27/3.6]? Gaia BP-RP colormagphot.color;em.opt.B;em.opt.RfloatnullableVoff[0/1] Velocity offsetkm/sphys.veloc;arith.difffloatRVexp[17.21/20.29] Expected radial velocity for membershipkm/sspect.dopplerVelocfloatRV[-55.55/54.85]? Radial velocity (1)km/sspect.dopplerVelocfloatnullablee_RV[0.99/14.59]? Uncertainty in RV (1)km/sstat.error;spect.dopplerVelocfloatnullableProt[0.213/20]? Rotation perioddtime.periodfloatnullablee_Prot[1e-3/2.27]? Uncertainty in Protdstat.error;time.periodfloatnullableVelaIdentified in Vela Population IV in Cantat-Gaudin+2019 (J/A+A/626/A17)? (2)meta.code.membercharSimbadSimbad column added by the CDSmeta.ref.urlchar_RA.icrsRight ascension (ICRS) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services)degpos.eq.raindexed_DE.icrsDeclination (ICRS) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services)degpos.eq.decindexed