J/other/Nat/486.375          KOI stellar parameters           (Buchhave+, 2012)
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Beginning of ReadMe : J/other/Nat/486.375 Stellar parameters of KOI stars (Buchhave+, 2012) ================================================================================ An abundance of small exoplanets around stars with a wide range of metallicities. Buchhave L.A., Latham D.W., Johansen A., Bizzarro M., Torres G., Rowe J.F., Batalha N.M., Borucki W.J., Brugamyer E., Caldwell C., Bryson S.T., Ciardi D.R., Cochran W.D., Endi M., Esquerdo G.A., Ford E.B., Geray J.C., Gilliland R.L., Hansen T., Isaacson H., Laird J.B., Lucas P.W., Marcy G.W., Morse J.A., Robertson P., Shporer A., Stefanik R.P., Still M., Quinn S.N. <Nature, 485, 375-377 (2012)> =2012Natur.486..375B ================================================================================ ADC_Keywords: Stars, double and multiple ; Planets Abstract: The abundance of heavy elements (metallicity) in the photospheres of stars similar to the Sun provides a "fossil" record of the chemical composition of the initial protoplanetary disk. Metal-rich stars are much more likely to harbour gas giant planets, supporting the model that planets form by accumulation of dust and ice particles5. Recent ground-based surveys suggest that this correlation is weakened for Neptunian-sized planets. However, how the relationship between size and metallicity extends into the regime of terrestrial-sized exoplanets is unknown. Here we report spectroscopic metallicities of the host stars of 226 small exoplanet candidates discovered by NASA's Kepler mission, including objects that are comparable in size to the terrestrial planets in the Solar System. Description: In February 2011, the Kepler mission announced its discovery of 1,235 planet candidates, of which more than half have radii smaller than that of Neptune: R_P_<4R_earth_, where R_earth_ plus is the Earth radius. We used reconnaissance spectra obtained by the Kepler Follow-up Observing Program (FOP) to derive metallicities for several hundred of the brighter planet candidates, and used the results to explore the relationship between planet size and host-star metallicity.

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