J/ApJ/946/61ivo://CDS.VizieR/J/ApJ/946/61doi:10.26093/cds/vizier/ba-xj-1xCDSLoaiza-Tacuri V.Cunha K.Smith V.V.Martinez C.F.Ghezzi L.,Schuler S.C.Teske J.Howell S.B.2026-07-02T11:58:56Z2025-04-09T14:00:41ZCDS support team

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

cds-question@unistra.frchemical-abundanceseffective-temperaturevisible-astronomyspectroscopystellar-radiistellar-massesexoplanetsThe physical properties of transiting exoplanets are connected with the physical properties of their host stars. We present a homogeneous spectroscopic analysis based on the spectra of FGK-type stars observed with the Hydra spectrograph on the WIYN telescope. We derived the effective temperatures, surface gravities, and metallicities, for 81 stars observed by K2 and 33 by Kepler 1. We constructed an FeI and FeII line list that is adequate for the analysis of R~18000 spectra covering 6050-6350{AA} and adopted the spectroscopic technique based on equivalent-width measurements. The calculations were done in LTE using Kurucz model atmospheres and the qoyllur-quipu (q^2^) package. We validated our methodology via an analysis of a benchmark solar twin and solar proxies, which are used as a solar reference. We estimated the effects that including Zeeman-sensitive FeI lines have on the derived stellar parameters for young and possibly active stars in our sample and found them not to be significant. Stellar masses and radii were derived by combining the stellar parameters with Gaia EDR3 and V magnitudes and isochrones. The measured stellar radii have a 4.2% median internal precision, leading to a median internal uncertainty of 4.4% in the derived planetary radii. With our sample of 83 confirmed planets orbiting K2 host stars, the radius gap near R_planet_~1.9R_{Earth}_ is detected, in agreement with previous findings. Relations between the planetary radius, orbital period, and metallicity are explored and these also confirm previous findings for Kepler 1 systems.2023ApJ...946...61Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/946/61CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toV/133 : Kepler Input Catalog (Kepler Mission Team, 2009)IV/34 : K2 Ecliptic Plane Input Catalog (EPIC) (Huber+, 2017)I/347 : Distances to 1.33 billion stars in Gaia DR2 (Bailer-Jones+, 2018)IV/38 : TESS Input Catalog - v8.0 (TIC-8) (Stassun+, 2019)I/350 : Gaia EDR3 (Gaia Collaboration, 2020)III/284 : APOGEE-2 data from DR16 (Johnsson+, 2020)I/352 : Distances to 1.47 billion stars in Gaia EDR3 (Bailer-Jones+, 2021)J/A+AS/141/371 : Low-mass stars isochrones (Girardi+, 2000)J/A+A/415/1153 : [Fe/H] for 98 extra-solar planet-host stars (Santos+, 2004)J/ApJ/622/1102 : The planet-metallicity correlation. (Fischer+, 2005)J/A+A/508/L17 : Abundances in solar analogs (Ramirez+, 2009)J/AJ/142/160 : Kepler Mission. II. EBs in DR2 (Slawson+, 2011)J/A+A/533/A141 : Stellar parameters for 582 HARPS FGK stars (Sousa+, 2011)J/other/Nat/486.375 : Stellar parameters of KOI stars (Buchhave+, 2012)J/ApJS/204/24 : Kepler planetary candidates. III. (Batalha+, 2013)J/ApJ/771/40 : Main-sequence A, F, G, and K stars phot. (Boyajian+, 2013)J/ApJ/771/107 : Spectroscopy of faint KOI stars (Everett+, 2013)J/ApJ/764/78 : Oxygen abundances in nearby FGK stars (Ramirez+, 2013)J/A+A/562/A71 : Abundances of solar neighbourhood dwarfs (Bensby+, 2014)J/ApJ/791/14 : 18 Sco atomic data and equivalent widths (Melendez+, 2014)J/MNRAS/445/2758 : KIC giants Bayesian dist. and extinctions (Rodrigues+ 2014)J/A+A/579/A19 : K2 Variable Catalogue (Armstrong+, 2015)J/ApJ/808/187 : Metallicities of KIC stars without planets (Buchhave+, 2015)J/MNRAS/452/3561 : Kepler EB stars. K2 Campaign 0 (LaCourse+, 2015)J/ApJ/809/25 : Stellar and planet data for K2 candidates (Montet+, 2015)J/ApJS/217/31 : Kepler planetary cand. VI. 4yr Q1-Q16 (Mullally+, 2015)J/ApJ/815/5 : Abundances of KOI stars with planets. I. (Schuler+, 2015)J/A+A/594/A100 : K2 new planetary and EB candidates (Barros+, 2016)J/ApJS/225/32 : Extended abundance analysis of cool stars (Brewer+, 2016)J/ApJS/226/7 : Planets discovered using K2's 1st yr (Crossfield+, 2016)J/ApJS/224/2 : K2 EPIC stellar properties for 138600 targets (Huber+, 2016)J/MNRAS/463/1780 : Exoplanet candidates in Praesepe (M 44) (Libralato+, 2016)J/AJ/152/187 : Planet occurrence & metallicity for KOIs (Mulders+, 2016)J/ApJS/222/14 : Planetary cand. from 1st yr K2 mission (Vanderburg+, 2016)J/ApJ/835/173 : Kepler asteroseismic LEGACY set. II. (Silva Aguirre+, 2017)J/AJ/153/71 : Kepler follow-up obs. program. I. Imaging (Furlan+, 2017)J/ApJ/844/102 : KIC star plx from asteroseismology vs Gaia (Huber+, 2017)J/AJ/154/224 : Transiting planets in clusters from K2 (Rizzuto+, 2017)J/ApJS/233/23 : APOKASC cat. of KIC dwarfs and subgiants (Serenelli+, 2017)J/ApJ/866/99 : Radii of KIC stars & planets using Gaia DR2 (Berger+, 2018)J/ApJS/237/38 : Extended abundance analysis of KOIs (Brewer+, 2018)J/ApJS/239/5 : Variable stars and cand. planets from K2 (Crossfield+, 2018)J/A+A/619/A97 : CoRoT transit catalogue (Deleuil+, 2018)J/AJ/156/264 : California-Kepler Survey (CKS). VII. (Fulton+, 2018)J/ApJ/860/109 : Keck HIRES obs. of 245 subgiants (Ghezzi+, 2018)J/AJ/156/277 : Planets from K2 campaigns 5-8 (Livingston+, 2018)J/A+A/619/A73 : Solar Twins activity (Lorenzo-Oliveira+, 2018)J/AJ/155/136 : Planets orbiting bright stars in K2 C0-10 (Mayo+, 2018)J/AJ/155/21 : Planet candidates from K2 campaigns 5-8 (Petigura+, 2018)J/ApJS/239/32 : APOKASC-2 cat. of Kepler evolved stars (Pinsonneault+, 2018)J/ApJS/235/38 : Kepler planetary cand. VIII. (Thompson+, 2018)J/AJ/155/68 : Elemental abundances of KOIs in APOGEE. I. (Wilson+, 2018)J/ApJS/238/30 : LAMOST obs. in Kepler field. II. 5yrs LRS sp. (Zong+, 2018)J/ApJS/244/11 : Planet candidates and EBs in K2 campaigns 0-8 (Kruse+, 2019)J/AJ/160/108 : Gaia-Kepler stellar properties cat. II. (Berger+, 2020)J/AJ/159/211 : Exoplanets parameters from Kepler and K2 (Cloutier+, 2020)J/ApJS/247/28 : K2 star param. from Gaia & LAMOST (Hardegree-Ullman+, 2020)J/ApJ/895/52 : EW and abundances in 211 stars with HARPS (Spina+, 2020)J/MNRAS/496/851 : Planet candidates from K2 Campaigns 1-13 (Wittenmyer+, 2020)J/MNRAS/506/150 : The GALAH+ Survey DR3 (Buder+, 2021)J/ApJ/920/19 : Spectroscopic analysis of CKS. II. (Ghezzi+, 2021)J/AJ/161/164 : Obs. of 186 TESS stars with NESSI (WYIN) (Howell+, 2021)J/AJ/162/75 : Speckle obs. TESS exoplanet host stars. II. (Lester+, 2021)J/AJ/162/259 : Scaling K2. IV. C1-8 & 10-18 planets sample (Zink+, 2021)J/MNRAS/514/4300 : Late-type dwarfs logR'HK and magnetic fields (Brown+, 2022)J/MNRAS/510/2041 : Planetary systems study with GALAH surveys (Clark+, 2022)J/AJ/163/179 : The California-Kepler Survey. X. (Petigura+, 2022)J/ApJS/261/26 : Host stars from LAMOST, TESS, Kepler & K2 (Su+, 2022)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/946/61https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/946/61http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/946/61https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/946/61https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/946/61http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/946/61GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/946/61/stars (Stellar parameters (Tables 1 and 3))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/946/61/stars?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/946/61/stars?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/946/61/stars?GETtext/xml+votable180.050000true181.1208333-4.89916670.005555555555555556Cone search capability for table J/ApJ/946/61/table6 (Planetary radii)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/946/61/table6?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/946/61/table6?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/946/61/table6?GETtext/xml+votable180.050000true181.1214089-4.89921440.0055555555555555566/267 269-270 275-276 279 313 328 339 353-354 378 391 397 406 437 450 471 1066 4269 4271 4273 4330 4351 4624 4629 4632 4659 4696 4698 4704 4720 4730 4733 9996 14579 14581 14779 14794 14827 14830 14930-14931 14933 14953-14954 14959-14960 14971 15043 15060 15110 15113 15119 15121 15126 15128 15134 15146 15169 18029 18033 18150 18344-18345 18350 18453 18473 18536 18565 18574 18578 23862 23940 24324 24341 24344 25423 25454 25463 25562 25565 25710 25725 25757 25783 25810 26114 26253 26953 26959 26961 26982-26983 26986 26990-26992 27001 27025 27075 27079-27080 27085 27684https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/946/61?format=asciiOpticaldefaultJ/ApJ/946/61/starsStellar parameters (Tables 1 and 3)SimbadSimbad column added by the CDSmeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNpNumber of planet for this star (link to Table 6)meta.numberintnullableIDStar identifiermeta.id;meta.maincharprimaryONameHost other namemeta.idcharObs[2015/2019] Year of the observationtime.epochRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.mainVmag[8.87/14.8] Apparent V band magnitude from the NASA Exoplanet Archivemagphot.mag;em.opt.VfloatExpExposure time per spectrumstime.duration;obs.exposurecharS/N[50/255] Signal-to-Noise of the reduced spectrastat.snrintTeff[4296/6365] Effective temperatureKphys.temperature.effectiveinte_Teff[56/307] Uncertainty in TeffKstat.error;phys.temperature.effectiveintlog(g)[3/4.8] log surface gravitylog(cm.s**-2)phys.gravityfloatf_log(g)Flag on log(g) (1)meta.code;phys.gravitychare_log(g)[0.1/0.6] Uncertainty in log(g)log(cm.s**-2)stat.error;phys.gravityfloatA(Fe)[7/8] The iron abundance; log(N(Fe)/N(H))+12phys.abund.Fefloate_A(Fe)[0.05/0.3] Uncertainty in A(Fe)stat.error;phys.abund.FefloatVTurb[0.5/1.9] Microturbulent velocitykm/sphys.veloc.microTurbfloate_VTurb[0.1/0.5] Uncertainty in VTurbkm/sstat.error;phys.veloc.microTurbfloatRs[0.6/4.1] Stellar radiussolRadphys.size.radiusfloatf_RsFlag on Rs (2)meta.code;phys.size.radiuschare_Rs[0.01/1.4] Uncertainty in RssolRadstat.error;phys.size.radiusfloatMs[0.67/1.5] Stellar masssolMassphys.massfloatf_MsFlag on Ms (2)meta.code;phys.masschare_Ms[0.02/0.4] Uncertainty in MssolMassstat.error;phys.massfloatJ/ApJ/946/61/table6Planetary radiiIDStar identifiermeta.id.parentcharSimbadSimbad column added by the CDSmeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintPlanetPlanet namemeta.id;meta.maincharDeltaF[44.3/19011] Transit depth, {Delta}F (1)(10-6)src.var.amplitudefloatRp[0.56/13.9] Planetary radius(6.3781x10+6m)phys.size.radiusfloate_Rp[0.02/1.1] Uncertainty in Rp(6.3781x10+6m)stat.error;phys.size.radiusfloat_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.main