Livingston, John H.John H.LivingstonDai, FeiFeiDaiHirano, TeruyukiTeruyukiHiranoGandolfi, DavideDavideGandolfiNowak, GrzegorzGrzegorzNowakEndl, MichaelMichaelEndlVelasco, SergioSergioVelascoFukui, AkihikoAkihikoFukuiNarita, NorioNorioNaritaPrieto-Arranz, JorgeJorgePrieto-ArranzBarragan, OscarOscarBarraganCUSANO, FELICEFELICECUSANOAlbrecht, SimonSimonAlbrechtCabrera, JuanJuanCabreraCochran, William D.William D.CochranCsizmadia, SzilardSzilardCsizmadiaDeeg, Hans J.Hans J.DeegEigmüller, PhilippPhilippEigmüllerErikson, AndersAndersEriksonFridlund, MalcolmMalcolmFridlundGrziwa, SaschaSaschaGrziwaGuenther, Eike W.Eike W.GuentherHatzes, Artie P.Artie P.HatzesKawauchi, KiyoeKiyoeKawauchiKorth, JudithJudithKorthNespral, DavidDavidNespralPalle, EnricEnricPallePätzold, MartinMartinPätzoldPersson, Carina M.Carina M.PerssonRauer, HeikeHeikeRauerSmith, Alexis M. S.Alexis M. S.SmithTamura, MotohideMotohideTamuraTanaka, YusukeYusukeTanakaVan Eylen, VincentVincentVan EylenWatanabe, NoriharuNoriharuWatanabeWinn, Joshua N.Joshua N.Winn2020-10-272020-10-2720180004-6256http://hdl.handle.net/20.500.12386/28030We present the discovery of three small planets transiting K2-136 (LP 358 348, EPIC 247589423), a late K dwarf in the Hyades. The planets have orbital periods of 7.9757 ± 0.0011, {17.30681}<SUB>-0.00036</SUB><SUP>+0.00034</SUP>, and {25.5715}<SUB>-0.0040</SUB><SUP>+0.0038</SUP> {days}, and radii of 1.05 ± 0.16, 3.14 ± 0.36, and {1.55}<SUB>-0.21</SUB><SUP>+0.24</SUP> {R}<SUB>\oplus </SUB>, respectively. With an age of 600-800 Myr, these planets are some of the smallest and youngest transiting planets known. Due to the relatively bright (J = 9.1) host star, the planets are compelling targets for future characterization via radial velocity mass measurements and transmission spectroscopy. As the first known star with multiple transiting planets in a cluster, the system should be helpful for testing theories of planet formation and migration.STAMPAenArticle10.3847/1538-3881/aaa8412-s2.0-85043498994000425117500005https://iopscience.iop.org/article/10.3847/1538-3881/aaa8412018AJ....155..115LFIS/05 - ASTRONOMIA E ASTROFISICAERC sectors::Physical Sciences and Engineering