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    The California Planet Survey. I. Four New Giant Exoplanets

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    Date
    2010-10
    Author
    Howard, Andrew W.
    Johnson, John A.
    Marcy, Geoffrey W.
    Fischer, Debra A.
    Wright, Jason T.
    Bernat, David
    Henry, Gregory W.
    Peek, Kathryn M. G.
    Isaacson, Howard
    Apps, Kevin
    Endl, Michael
    Cochran, William D.
    Valenti, Jeff A.
    Anderson, Jay
    Piskunov, Nikolai E.
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    Abstract
    We present precise Doppler measurements of four stars obtained during the past decade at Keck Observatory by the California Planet Survey (CPS). These stars, namely, HD 34445, HD 126614, HD 13931, and Gl 179, all show evidence for a single planet in Keplerian motion. We also present Doppler measurements from the Hobby-Eberly Telescope (HET) for two of the stars, HD 34445 and Gl 179, that confirm the Keck detections and significantly refine the orbital parameters. These planets add to the statistical properties of giant planets orbiting near or beyond the ice line, and merit follow-up by astrometry, imaging, and space-borne spectroscopy. Their orbital parameters span wide ranges of planetary minimum mass (M sin i = 0.38-1.9 M(Jup)), orbital period (P = 2.87-11.5 yr), semimajor axis (a = 2.1-5.2 AU), and eccentricity (e = 0.02-0.41). HD 34445 b (P = 2.87 yr, M sin i = 0.79 MJup, e = 0.27) is a massive planet orbiting an old, G-type star. We announce a planet, HD 126614 Ab, and an M dwarf, HD 126614 B, orbiting the metal-rich star HD 126614 (which we now refer to as HD 126614 A). The planet, HD 126614 Ab, has minimum mass M sin i = 0.38 MJup and orbits the stellar primary with period P = 3.41 yr and orbital separation a = 2.3 AU. The faint M dwarf companion, HD 126614 B, is separated from the stellar primary by 489 mas (33 AU) and was discovered with direct observations using adaptive optics and the PHARO camera at Palomar Observatory. The stellar primary in this new system, HD 126614 A, has the highest measured metallicity ([ Fe/ H] = + 0.56) of any known planet-bearing star. HD 13931 b (P = 11.5 yr, M sin i = 1.88 MJup, e = 0.02) is a Jupiter analog orbiting a near solar twin. Gl 179 b (P = 6.3 yr, M sin i = 0.82 M(Jup), e = 0.21) is a massive planet orbiting a faint M dwarf. The high metallicity of Gl 179 is consistent with the planet-metallicity correlation among M dwarfs, as documented recently by Johnson & Apps.
    Department
    McDonald Observatory
    Subject
    binaries: visual
    planetary systems
    stars: individual (hd 34445, hd
    126614, hd 24496, hd 13931, g1 179)
    techniques: high angular
    resolution
    techniques: photometric
    techniques: radial velocities
    hobby-eberly telescope
    radial-velocity
    extrasolar planets
    cool stars
    echelle spectrometer
    orbital migration
    magnetic activity
    mass stars
    m-dwarf
    search
    astronomy & astrophysics
    URI
    http://hdl.handle.net/2152/35164
    Citation
    Howard, Andrew W., John Asher Johnson, Geoffrey W. Marcy, Debra A. Fischer, Jason T. Wright, David Bernat, Gregory W. Henry et al. "The California planet survey. I. Four new giant exoplanets." The Astrophysical Journal, Vol. 721, No. 2 (Oct., 2010): 1467.
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    • facebook
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    • CONTACT US
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    © The University of Texas at Austin