J/AJ/169/47ivo://CDS.VizieR/J/AJ/169/47CDSKunimoto M.Lin Z.Millholland S.Venner A.Hinkel N.R.Shporer A.,Vanderburg A.Bailey J.Brahm R.Burt J.A.Butler R.P.Carter B.,Ciardi D.R.Collins K.A.Collins K.I.Colon K.D.Crane J.D.,Daylan T.Diaz M.R.Doty J.P.Feng F.Guenther E.W.Horner J.,Howell S.B.Janik J.Jones H.R.A.Kabath P.Kanodia S.,Littlefield C.Osborn H.P.O'Toole S.Paegert M.Pintr P.,Schwarz R.P.Shectman S.Srdoc G.Stassun K.G.Teske J.K.,Twicken J.D.Vanzi L.Wang S.X.Wittenmyer R.A.Jenkins J.M.,Ricker G.R.Seager S.Winn J.2026-03-02T06:25:50Z2025-11-18T09:22:13ZCDS support team

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

cds-question@unistra.frexoplanetsradial-velocityspectroscopyvisible-astronomydwarf-starsk-starsWe report the validation of multiple planets transiting the nearby (d=12.8pc) K5V dwarf HD 101581 (GJ 435, TOI-6276, TIC 397362481). This system consists of at least two Earth-size planets whose orbits are near a mutual 4:3 mean-motion resonance, HD 101581 b (R_p_=0.956_-0.061_^+0.063^R_{Earth}_, P=4.47d) and HD 101581c (R_p_=0.990_-0.070_^+0.070^R_{Earth}_, P=6.21d). Both planets were discovered in Sectors 63 and 64 TESS observations and statistically validated with supporting ground-based follow-up. We also identify a signal that probably originates from a third transiting planet, TOI-6276.03 (R_p_=0.982_-0.098_^+0.114^R_{Earth}_, P=7.87d). These planets are remarkably uniform in size and their orbits are evenly spaced, representing a prime example of the "peas-in-a-pod" architecture seen in other compact multiplanet systems. At V=7.77, HD 101581 is the brightest star known to host multiple transiting planets smaller than 1.5R_{Earth}_. HD 101581 is a promising system for atmospheric characterization and comparative planetology of small planets.2025AJ....169...47Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/169/47CatalogResearchIsServedByTAP VizieR generic servicerelated-toI/311 : Hipparcos, the New Reduction (van Leeuwen, 2007)I/322A : UCAC4 Catalogue (Zacharias+, 2012)I/337 : Gaia DR1 (Gaia Collaboration, 2016)I/350 : Gaia EDR3 (Gaia Collaboration, 2020)VI/120 : High-resolution synthetic stellar library (Coelho+, 2005)VII/233 : 2MASS All-Sky Extended Source Catalog (XSC) (IPAC/UMass, 2003-2006)J/AJ/132/161 : NStars project: The southern sample. I. (Gray+, 2006)J/MNRAS/372/163 : Activity indices for southern stars (Jenkins+, 2006)J/A+A/487/373 : Spectroscopic parameters of 451 HARPS-GTO stars (Sousa+, 2008)J/other/A+ARV/18.67 : Accurate masses and radii of normal stars (Torres+, 2010)J/AJ/142/19 : Speckle observations of KOI (Howell+, 2011)J/ApJS/197/8 : Kepler's candidate multiple transiting planets (Lissauer+, 2011)J/AJ/148/54 : The Hypatia Catalog ((Hinkel+, 2014)J/AJ/152/180 : Bolometric fluxes of eclip. binaries in Tycho-2 (Stassun+, 2016)J/ApJ/834/17 : Mass & radius of planets, moons, low mass stars (Chen+, 2017)J/AJ/153/136 : Planets & their host stars with Gaia parallaxes (Stassun+, 2017)J/A+A/619/L10 : pi Men radial velocity curves (Gandolfi+, 2018)J/AJ/155/106 : New Doppler velocity measurements of GJ 876 (Millholland+, 2018)J/A+A/615/A76 : Spectroscopic parameters of stars (SPECIES). I. (Soto+, 2018)J/ApJS/235/38 : Kepler planetary cand. VIII. DR25 reliability (Thompson+, 2018)J/AJ/155/48 : California-Kepler Survey (CKS). V. Masses & radii (Weiss+, 2018)J/A+A/629/A111 : L 98-59 (TOI 175) HARPS observations (Cloutier+, 2019)J/A+A/622/L7 : GJ143 and HD23472 radial velocity curves (Trifonov+, 2019)J/ApJ/888/43 : APOGEE-Kepler Cool Dwarf star ages determinati. (Claytor+, 2020)J/A+A/636/A74 : HARPS radial velocity database (Trifonov+, 2020)J/AJ/161/106 : Radial velocities of 12 Psc and HD 159062 (Bowler+, 2021)J/ApJS/254/42 : Hipparcos-Gaia (EDR3) Catalog of Accelerations (Brandt, 2021)J/AJ/161/24 : TRICERATOPS predictions for 384 TOIs (Giacalone+, 2021)J/ApJS/254/39 : Exoplanet candidates from TESS first 2yr obs (Guerrero+, 2021)J/AJ/161/23 : RV & light curve of low mass star TOI 540 (Ment+, 2021)J/A+A/665/A154 : HD23472 radial velocity observations (Barros+, 2022)J/A+A/673/A69 : LTT 1445A ESPRESSO observations (Lavie+, 2023)J/AJ/167/233 : Best-in-class TOIs for atmosph. characterisation (Hord+, 2024)J/A+A/683/A125 : HARPS radial velocity database (Perdelwitz+, 2024)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/169/47https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/169/47http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/169/47https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/169/47https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/169/47http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/169/47GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/AJ/169/47/table2Radial velocity measurementsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintInstInstrument (1)meta.id;instrcharBJD[2452389/2460385] Barycentric Julian Datedtime.epochdoubleRVel[-16.7/14464] Radial velocity (2)m/sspect.dopplerVelocdoublee_RVel[0.58/54] Uncertainty in rvm/sstat.error;spect.dopplerVelocfloatS[0.25/0.44]? S-index activity indicatorspect.indexfloatnullable