J/AJ/168/118ivo://CDS.VizieR/J/AJ/168/118doi:10.26093/cds/vizier.51680118CDSGiovinazzi M.R.Cale B.Eastman J.D.Rodriguez J.E.Blake C.H.,Stassun K.G.Vanderburg A.Kunimoto M.Kraus A.L.Twicken J.,Beatty T.G.Dedrick C.M.Horner J.Johnson J.A.Johnson S.A.,McCrady N.Plavchan P.Sliski D.H.Wilson M.L.Wittenmyer R.A.,Wright J.T.Johnson M.C.Rose M.E.Cornachione M.2025-05-21T20:12:39Z2025-02-06T14:10:02ZCDS support team

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

cds-question@unistra.frradial-velocitymultiple-starsexoplanetsvisible-astronomyspectroscopyWe present a new analysis of the KELT-24 system, comprising a well-aligned hot Jupiter, KELT-24 b, and a bright (V=8.3), nearby (d=96.9pc) F-type host star. KELT-24 b was independently discovered by two groups in 2019, with each reporting best-fit stellar parameters that were notably inconsistent. Here, we present three independent analyses of the KELT-24 system, each incorporating a broad range of photometric and spectroscopic data, including eight sectors of Transiting Exoplanet Survey Satellite (TESS) photometry and more than 200 new radial velocities (RVs) from the MINiature Exoplanet Radial Velocity Array. Two of these analyses use KELT-24's observed spectral energy distribution (SED) through a direct comparison to stellar evolutionary models, while our third analysis assumes an unknown additional body contributing to the observed broadband photometry and excludes the SED. Ultimately, we find that the models that include the SED are a poor fit to the available data, so we adopt the system parameters derived without it. We also highlight a single transit-like event observed by TESS, deemed likely to be an eclipsing binary bound to KELT-24, that will require follow-up observations to confirm. We discuss the potential of these additional bodies in the KELT-24 system as a possible explanation for the discrepancies between the results of the different modeling approaches, and explore the system for longer-period planets that may be weakly evident in the RV observations. The comprehensive investigations that we present not only increase the fidelity of our understanding of the KELT-24 system but also serve as a blueprint for future stellar modeling in global analyses of exoplanet systems.2024AJ....168..118Ghttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/168/118CatalogResearchIsServedByTAP VizieR generic servicerelated-toVI/39 : Model Atmospheres (Kurucz, 1979)III/135 : Henry Draper Catalogue and Extension (Cannon+ 1918-1924; ADC 1989)I/259 : The Tycho-2 Catalogue (Hog+ 2000)II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)II/281 : 2MASS 6X Point Source Working Database / Catalog (Cutri+ 2006)IV/38 : TESS Input Catalog - v8.0 (TIC-8) (Stassun+, 2019)I/350 : Gaia EDR3 (Gaia Collaboration, 2020)J/ApJ/646/505 : Catalog of nearby exoplanets (Butler+, 2006)J/ApJ/720/1118 : i-band photometry of HAT-P-16 (Buchhave+, 2010)J/ApJ/718/810 : Astrometry & Photometry in the Arches cluster (Stolte+, 2010)J/other/A+ARV/18.67 : Accurate masses and radii of normal stars (Torres+, 2010)J/A+A/529/A75 : Limb-darkening coefficients (Claret+, 2011)J/ApJ/757/18 : Rvels for 16 hot Jupiter host stars (Albrecht+, 2012)J/ApJ/756/L33 : Radial velocities of 2 hot Jupiters in Praesepe (Quinn+, 2012)J/A+A/549/A109 : HARPS XXXI. The M-dwarf sample (Bonfils+, 2013)J/A+A/550/A53 : Public code ARoME for modeling the RM effect (Boue+, 2013)J/A+A/562/A71 : Abundances of solar neighbourhood dwarfs (Bensby+, 2014)J/ApJ/818/43 : Stellar surface gravity measures of KIC stars (Bastien+, 2016)J/AJ/152/180 : Bol. fluxes of eclipsing binaries in Tycho-2 (Stassun+, 2016)J/AJ/153/136 : Planets and host stars with Gaia parallaxes (Stassun+, 2017)J/AJ/156/234 : KELT transit false positive catalog for TESS (Collins+, 2018)J/ApJ/856/23 : BANYAN. XI. The BANYAN {Sigma} algorithm (Gagne+, 2018)J/A+A/631/A76 : MASCARA-3b radial and light curves (Hjorth+, 2019)J/ApJ/871/63 : How to constrain your M dwarf. II. Nearby bin. (Mann+, 2019)J/AJ/158/197 : Radial velocities & light curves of KELT-24 (Rodriguez+, 2019)J/ApJ/904/140 : R147 members & rot. data for 5 other cl. (Curtis+, 2020)J/AcA/70/181 : Search for Planets in Hot Jupiter Systems (Maciejewski+, 2020)J/ApJS/254/42 : Hipparcos-Gaia (EDR3) Catalog of Accelerations (Brandt, 2021)J/ApJS/254/39 : Exoplanet candidates from TESS first 2yr obs (Guerrero+, 2021)J/AJ/161/194 : LCs & RVs of 5 exoplanets from TESS disc. (Rodriguez+, 2021)J/AJ/164/70 : TESS Grand Unified Hot Jupiter Survey I. (Yee+, 2022)J/ApJS/265/1 : TESS Grand Unified Hot Jupiter Surveys. II. (Yee+, 2023)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/168/118https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/168/118http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/168/118https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/168/118https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/168/118http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/168/118GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/AJ/168/118/table3Relative RVs for KELT-24 taken from MINERVArecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJD[2458568.7/2458881.9] Barycentric Julian Date; TDBdtime.epochdoubleRVel[-737/804] Radial velocitym/sspect.dopplerVelocfloate_RVel[47.6/665.4] Uncertainty in RVelm/sstat.error;spect.dopplerVelocfloatInstInstrument (1)meta.id;instrchar