J/ApJ/973/L30ivo://CDS.VizieR/J/ApJ/973/L30CDSBarber M.G.Thao Pa C.Mann A.W.Vanderburg A.Mori M.,Livingston J.H.Fukui A.Narita N.Kraus A.L.Tofflemire B.M.,Newton E.R.Winn J.N.Jenkins J.M.Seager S.Collins K.A.,Twicken J.D.2026-05-04T07:43:19Z2026-04-15T14:59:15ZCDS support team

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

cds-question@unistra.frexoplanetsinfrared-photometryvisible-astronomyyoung-stellar-objectsThe youngest (<50Myr) planets are vital to understand planet formation and early evolution. The 17 Myr system HIP 67522 is already known to host a giant (~10R_{Earth}_) planet on a tight orbit. In their discovery paper, Rizzuto et al. reported a tentative single-transit detection of an additional planet in the system using TESS. Here, we report the discovery of HIP 67522c, a 7.9R_{Earth}_ planet that matches with that single-transit event. We confirm the signal with ground-based multiwavelength photometry from Sinistro and MuSCAT4. At a period of 14.33days, planet c is close to a 2:1 mean-motion resonance with b (6.96days or 2.06:1). The light curve shows distortions during many of the transits, which are consistent with spot-crossing events and/or flares. Fewer stellar activity events are seen in the transits of planet b, suggesting that planet c is crossing a more active latitude. Such distortions, combined with systematics in the TESS light-curve extraction, likely explain why planet c was previously missed.2024ApJ...973L..30Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/973/L30CatalogResearchIsServedByTAP VizieR generic servicerelated-toIV/34 : K2 Ecliptic Plane Input Catalog (EPIC) (Huber+, 2017)I/357 : Gaia DR3 Part 3. Non-single stars (Gaia Collaboration, 2022)J/ApJS/197/8 : Kepler's candidate multiple transiting planets (Lissauer+, 2011)J/MNRAS/421/2342 : 4 Kepler systems transit timing obs. (Steffen+, 2012)J/ApJ/784/45 : Kepler's multiple planet candidates. III. (Rowe+, 2014)J/AJ/154/224 : Transiting planets in young clusters from K2 (Rizzuto+, 2017)J/AJ/161/24 : TRICERATOPS predictions for 384 TOIs (Giacalone+, 2021)J/ApJ/917/23 : SPYGLASS. I. Mapping young stellar structures (Kerr+, 2021)J/AJ/161/171 : THYME. V. Discovering a new stellar assoc. (Tofflemire+, 2021)J/AJ/163/247 : HIRES, PEPSI & TRES radial veloc. of V1298 Tau (Johnson+, 2022)J/AJ/163/156 : THYME. VI. TOI-1227 radial velocity (Mann+, 2022)J/A+A/664/A163 : TOI-1807 RV and flux curves (Nardiello+, 2022)J/AJ/166/175 : Pre- and main sequence stars properties (Fernandes+, 2023)J/A+A/677/A59 : SigMA clusters in Sco-Cen (Ratzenboeck+, 2023)J/AJ/166/28 : Valid. of 69 exoplanets with ExoMiner V1.2 (Valizadegan+, 2023)J/AJ/165/85 : THYME. IX. MELANGE-4 association members (Wood+, 2023)J/AJ/167/55 : Multiple-planet system resonances (Hamer+, 2024)J/AJ/168/41 : THYME. X. MELANGE-5 association cand. members (Thao+, 2024)J/AJ/167/210 : <200Myr planet's hosts TESS parameters (Vach+, 2024)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/973/L30https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/973/L30http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/973/L30https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/973/L30https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/973/L30http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/973/L30GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/ApJ/973/L30/fig1TESS light curve data of HIP 67522recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDBarycentric Julian Date - 2457000dtime.epochdoubleindexedFlux[0.96/1.05] Normalized fluxphot.flux;arith.ratiodoublee_Flux[7e-4/2e-3] Uncertainty in Fluxstat.error;phot.fluxfloatCad[20/120] Data cadencestime.intervalintJ/ApJ/973/L30/fig3aMuSCAT4 g' transit data of HIP 67522recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDBarycentric Julian Datedtime.epochdoubleFluxNormalized fluxphot.flux;arith.ratiodoublee_FluxUncertainty in Fluxphot.flux;arith.ratiodoubleModelTransit modelphot.flux;meta.modelleddoubleResidualsModel residualsstat.fit.residualdoubledFluxDetrended fluxphot.flux;arith.ratiodoubledModelDetrended flux transit modelphot.flux;meta.modelleddoubleJ/ApJ/973/L30/fig3bMuSCAT4 i' transit data of HIP 67522recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDBarycentric Julian Datedtime.epochdoubleFluxNormalized fluxphot.flux;arith.ratiodoublee_FluxUncertainty in Fluxphot.flux;arith.ratiodoubleModelTransit modelphot.flux;meta.modelleddoubleResidualsModel residualsstat.fit.residualdoubledFluxDetrended fluxphot.flux;arith.ratiodoubledModelDetrended flux transit modelphot.flux;meta.modelleddoubleJ/ApJ/973/L30/fig3cMuSCAT4 r' transit data of HIP 67522recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDBarycentric Julian Datedtime.epochdoubleFluxNormalized fluxphot.flux;arith.ratiodoublee_FluxUncertainty in Fluxphot.flux;arith.ratiodoubleModelTransit modelphot.flux;meta.modelleddoubleResidualsModel residualsstat.fit.residualdoubledFluxDetrended fluxphot.flux;arith.ratiodoubledModelDetrended flux transit modelphot.flux;meta.modelleddoubleJ/ApJ/973/L30/fig3dMuSCAT4 zs transit data of HIP 67522recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDBarycentric Julian Datedtime.epochdoubleFluxNormalized fluxphot.flux;arith.ratiodoublee_FluxUncertainty in Fluxphot.flux;arith.ratiodoubleModelTransit modelphot.flux;meta.modelleddoubleResidualsModel residualsstat.fit.residualdoubledFluxDetrended fluxphot.flux;arith.ratiodoubledModelDetrended flux transit modelphot.flux;meta.modelleddoubleJ/ApJ/973/L30/fig3eSinistro r' transit data of HIP 67522recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDBarycentric Julian Datedtime.epochdoubleFluxNormalized fluxphot.flux;arith.ratiodoublee_FluxUncertainty in Fluxphot.flux;arith.ratiodoubleModelTransit modelphot.flux;meta.modelleddoubleResidualsModel residualsstat.fit.residualdoubledFluxDetrended fluxphot.flux;arith.ratiodoubledModelDetrended flux transit modelphot.flux;meta.modelleddouble