# # Program information file # PROGRAM_ID 2023B088 PROGRAM_TITLE Precise Radial Velocity Follow Up of Exoplanet Candidate Orbiting a Young K Dwarf PROGRAM_INV1 Claire Geneser PROGRAM_INV2 Angelle Tanner PROGRAM_INV3 PROGRAM_INV4 PROGRAM_INV5 PROGRAM_SCICAT extra-solar planets PROGRAM_ABSTRACT_BEG This proposal to use iSHELL will obtain follow-up precise radial-velocity [PRV] measurements to continue monitoring one TESS candidate planet orbiting a young K dwarf star. Measuring the RVs of transiting candidate exoplanet systems provides confirmation of the candidates, determination of their masses and bulk density, evidence for additional planets, and constraints on the orbital eccentricities. K dwarfs are a highly sought-after exoplanet target as they are not as active as M dwarfs and yet are less massive than solar-type stars, allowing for lower mass planets to be confidently confirmed. The system TOI-139 exhibits youth indicators through Ca II H & K emission lines and has one transiting, hot mini-Neptune mass planet making this an ideal system for the study of planetary demographics. The planet confirmation potential of the iSHELL observations will be increased, when possible, by collecting simultaneous HIRES and/or CRIRES observations. PROGRAM_ABSTRACT_END