J/A+A/547/A36ivo://CDS.VizieR/J/A+A/547/A36doi:10.26093/cds/vizier.35470036CDSAdibekyan V.Zh.Delgado Mena E.Sousa G.Santos N.C.Israelian G.,Gonzalez Hernandez J.I.Mayor M.Hakobyan A.A.2017-12-22T05:32:39Z2012-10-25T08:06:13ZCDS support team

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

cds-question@unistra.frmultiple-starssolar-system-planetschemically-peculiar-starsRecent studies showed that at low metallicities Doppler-detected planet-hosting stars have preferably high alpha-content and belong to the thick disk.We used the reconnaissance spectra of 87 Kepler planet candidates and data available from the HARPS planet search survey to explore this phenomena. Using the traditional spectroscopic abundance analysis methods we derived Ti, Ca, and Cr abundances for the Kepler stars. In the metallicity region -0.65<[Fe/H]<-0.3dex the fraction of Ti-enhanced thick-disk HARPS planet harboring stars is 12.3+/-4.1% and for their thin-disk counterparts this fraction is 2.2+/-1.3%. The binomial statistics gives a probability of 0.008 that this could have occurred by chance. Combining the two samples (HARPS + Kepler) reinforces the significance of this result (P~99.97%). Since most of these stars are harboring small-mass/size planets we can assume that, although terrestrial planets can be found at low-iron regime, they are mostly enhanced by alpha-elements. This implies that early formation of rocky planets could get started in the Galactic thick disk, where the chemical conditions for their formation were more favorable.2012A&A...547A..36Ahttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/547/A36CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toV/133 : Kepler Input Catalog (Kepler Mission Team, 2009)J/A+A/497/563 : Chemical abundances of 451 stars (Neves+, 2009)J/A+A/545/A32 : Chemical abundances of 1111 stars (Adibekyan+, 2012)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/547/A36https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/547/A36http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/547/A36https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/547/A36https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/547/A36http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/547/A36GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/547/A36/table (Abundances for each star and element)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/547/A36/table?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/547/A36/table?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/547/A36/table?GETtext/xml+votable180.050000true286.808549.31641670.0055555555555555565/3706 3734 3742 6/14567 14573 14578 14585 14588 14734 14744 14746 14751 14757 14759 14765 14768-14769 14773-14774 14776 14794 14818 14830 14918 14920-14921 14924 14929-14930 14933 14945 14953 14959 14972-14973 15045 15060 15104 15108 15110 15112-15113 15119 15125 15131 15135 15143 15145-15146 15149 15153 15155 15158 15160 15168-15169 15171 15178https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/547/A36?format=asciidefaultJ/A+A/547/A36/tableAbundances for each star and elementrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintKOIStar's identifier (<KOI-NNNNN> in Simbad)meta.id;meta.mainint[Cr/H]? Abundance [Cr/H] (Z=24.0) (1)log(Sun)phys.abundfloatnullable[Ca/H]? Abundance [Ca/H] (Z=20.0) (1)log(Sun)phys.abundfloatnullable[Ti/H]? Abundance [Ti/H] (Z=22.0) (1)log(Sun)phys.abundfloatnullableKICDisplay the KIC data (2009, Cat. V/133)meta.ref.urlcharSimbadSimbad column added by the CDSmeta.refchar_RAPositions from KOI list, http://planetquest.jpl.nasa.gov/kepler/table (right ascension part)degpos.eq.ra;meta.main_DEPositions from KOI list, http://planetquest.jpl.nasa.gov/kepler/table (declination part)degpos.eq.dec;meta.main