J/other/Nat/481.475  Radial velocities of Kepler-34b & Kepler-35b (Welsh+, 2012)
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Beginning of ReadMe : J/other/Nat/481.475 Radial velocities of Kepler-34b & Kepler-35b (Welsh+, 2012) ================================================================================ Transiting circumbinary planets Kepler-34 b and Kepler-35 b. Welsh W.F., Orosz J.A., Carter J.A., Fabrycky D.C., Ford E.B., Lissauer J.J., Prsa A., Quinn S., Ragozzine D., Short D.R., Torres G., Winn J.N., Doyle L.R., Barclay T., Batalha N., Bloemen S., Brugamyer E., Buchhave L.A., Caldwell C., Caldwell D.A., Christiansen J.L., Ciardi D.R., Cochran W.D., Endl M., Fortney J.J., Gautier III T.N., Gilliland R.L., Haas M.R., Hall J.R., Holman M.J., Howard A.W., Howell S.B., Isaacson H., Jenkins J.M., Klaus T.C., Latham D.W., Li J., Marcy G.W., Mazeh T., Quintana E.V., Robertson P., Shporer A., Steffen J.A., Windmiller G., Koch D.G., Borucki W.J. <Nature, 481, 475-479 (2012)> =2012Natur.481..475W ================================================================================ ADC_Keywords: Stars, double and multiple ; Planets ; Radial velocities Keywords: Astronomy Abstract: Most Sun-like stars in the Galaxy reside in gravitationally bound pairs of stars (binaries). Although long anticipated the existence of a 'circumbinary planet' orbiting such a pair of normal stars was not definitively established until the discovery of the planet transiting (that is, passing in front of) Kepler-16. Questions remained, however, about the prevalence of circumbinary planets and their range of orbital and physical properties. Here we report two additional transiting circumbinary planets: Kepler-34(AB)b and Kepler-35(AB)b, referred to here as Kepler-34b and Kepler-35b, respectively. Each is a low-density gas-giant planet on an orbit closely aligned with that of its parent stars. Kepler-34b orbits two Sun-like stars every 289 days, whereas Kepler-35b orbits a pair of smaller stars (89% and 81% of the Sun's mass) every 131 days. The planets experience large multi-periodic variations in incident stellar radiation arising from the orbital motion of the stars. The observed rate of circumbinary planets in our sample implies that more than  1% of close binary stars have giant planets in nearly coplanar orbits, yielding a Galactic population of at least several million. Description: We observed Kepler-34 and Kepler-35 with the Hobby-Eberly Telescope (HET) and the Harlan J. Smith 2.7 m Telescope (HJST) at McDonald Observatory with the aim to help define the spectroscopic orbit of these two binary systems. We used the High Resolution Spectrograph23 (HRS) at the HET to collect 7 spectra for Kepler-34 in 2011 September and 4 spectra for Kepler-35 in 2011 October. Objects: ------------------------------------------------------------------------ RA (2000) DE Designation(s) (Period) ------------------------------------------------------------------------ 19 45 44.6 +44 38 29.6 Kepler 34 = KOI-2459 = KIC 8572936 (P=288.822) 19 37 59.3 +46 41 23.6 Kepler 35 = KOI-2937 = KIC 9837578 (P=131.458) ------------------------------------------------------------------------

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