J/ApJ/838/25ivo://CDS.VizieR/J/ApJ/838/25doi:10.26093/cds/vizier.18380025CDSGuo X.Johnson J.A.Mann A.W.Kraus A.L.Curtis J.L.Latham D.W.2018-03-12T08:28:22Z2017-11-27T15:03:10ZCDS support team

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

cds-question@unistra.frchemical-abundancesspectroscopyeffective-temperaturephotometrymultiple-starsThe occurrence rate of hot Jupiters from the Kepler transit survey is roughly half that of radial velocity surveys targeting solar neighborhood stars. One hypothesis to explain this difference is that the two surveys target stars with different stellar metallicity distributions. To test this hypothesis, we measure the metallicity distribution of the Kepler targets using the Hectochelle multi-fiber, high-resolution spectrograph. Limiting our spectroscopic analysis to 610 dwarf stars in our sample with logg>3.5, we measure a metallicity distribution characterized by a mean of [M/H]_mean_=-0.045+/-0.009, in agreement with previous studies of the Kepler field target stars. In comparison, the metallicity distribution of the California Planet Search radial velocity sample has a mean of [M/H]_CPS,mean_=-0.005+/-0.006, and the samples come from different parent populations according to a Kolmogorov-Smirnov test. We refit the exponential relation between the fraction of stars hosting a close-in giant planet and the host star metallicity using a sample of dwarf stars from the California Planet Search with updated metallicities. The best-fit relation tells us that the difference in metallicity between the two samples is insufficient to explain the discrepant hot Jupiter occurrence rates; the metallicity difference would need to be ~0.2-0.3dex for perfect agreement. We also show that (sub)giant contamination in the Kepler sample cannot reconcile the two occurrence calculations. We conclude that other factors, such as binary contamination and imperfect stellar properties, must also be at play.2017ApJ...838...25Ghttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/838/25CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toV/137 : Extended Hipparcos Compilation (XHIP) (Anderson+, 2012)V/133 : Kepler Input Catalog (Kepler Mission Team, 2009)VI/120 : High-resolution synthetic stellar library (Coelho+, 2005)J/ApJ/348/557 : X-ray studies of stars in the Pleiades (Micela+, 1990)J/A+A/420/183 : Spectrosc. survey in solar neighborhood (Allende Prieto+ 2004)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/ApJS/159/141 : Spectroscopic properties of cool stars. I. (Valenti+, 2005)J/ApJS/169/430 : Atmospheric param. of 1907 metal-rich stars (Robinson+, 2007)J/A+A/487/373 : Spectroscopic parameters of 451 HARPS-GTO stars (Sousa+, 2008)J/ApJS/190/1 : A survey of stellar families (Raghavan+, 2010)J/A+A/535/A30 : Abundances of 12 stars in open clusters (Carrera+, 2011)J/ApJ/742/54 : CASH project II. 14 extremely metal-poor stars (Hollek+, 2011)J/other/Nat/486.375 : Stellar parameters of KOI stars (Buchhave+, 2012)J/ApJ/753/90 : Stellar param. of K5 and later type Kepler stars (Mann+, 2012)J/A+A/538/A76 : Automatic stellar spectral classification (Navarro+, 2012)J/ApJ/771/107 : Spectroscopy of faint KOI stars (Everett+, 2013)J/ApJ/769/57 : Equivalent widths of metal-poor stars (Frebel+, 2013)J/ApJ/795/64 : A catalog of exoplanet physical param. (Foreman-Mackey+, 2014)J/ApJS/211/2 : Revised properties of Q1-16 Kepler targets (Huber+, 2014)J/ApJ/807/45 : Potentially habitable planets orbiting M dwarfsJ/AJ/150/134 : uvbyCaH{beta} photometry of NGC 752 (Twarog+, 2015)J/ApJS/225/32 : Extended abundance analysis of cool stars (Brewer+, 2016)J/ApJS/224/12 : Kepler planetary candidates. VII. 48-month (Coughlin+, 2016)J/AJ/152/8 : Impact of stellar multiplicity on planetary systems I.J/ApJ/822/86 : False positive proba. for Q1-Q17 DR24 KOIs (Morton+, 2016)J/A+A/587/A64 : Physical properties of giant exoplanets (Santerne+, 2016)http://exoplanetarchive.ipac.caltech.edu/ : NASA exoplanet archivehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/838/25https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/838/25http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/838/25https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/838/25https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/838/25http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/838/25GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/838/25/table2 (Stellar parameters of 776 Kepler stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/838/25/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/838/25/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/838/25/table2?GETtext/xml+votable180.050000true288.377542.2931390.0055555555555555566/14762 14763 14766 14937 14939 14940 14942 15104 15105 15111 15114 15115 15120 15122 15136 15137https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/838/25?format=asciiOpticaldefaultJ/ApJ/838/25/table2Stellar parameters of 776 Kepler starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintKICKepler identifiermeta.id;meta.mainintRAJ2000[19] Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000[42/46] Degree of Declination (J2000)pos.eq.dec;meta.mainKpmag[8.8/15] Apparent Kepler magnitudemagphot.mag;em.optfloatTeff[3980/7370] Effective temperature (1)Kphys.temperature.effectiveintlog(g)[1.2/5] Log surface gravity (1)log(cm.s**-2)phys.gravityfloat[M/H][-2.5/0.5] Metallicity by number density (1)log(Sun)meta.number;phys.densityfloatBinBinary code (N=not a binary; P=Potential binary, 46 occurrences)meta.codecharSimbadSimbad column added by the CDSmeta.ref.urlchar