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    The Mcdonald Observatory Planet Search: New Long-Period Giant Planets And Two Interacting Jupiters In The HD 155358 System

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    2012_04_mcdonaldobservatory.pdf (1.460Mb)
    Date
    2012-04
    Author
    Robertson, Paul
    Endl, Michael
    Cochran, William D.
    MacQueen, Phillip J.
    Wittenmyer, Robert A.
    Horner, Jonathan
    Brugamyer, Erik J.
    Simon, Attila E.
    Barnes, Stuart I.
    Caldwell, Caroline
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    Abstract
    We present high-precision radial velocity (RV) observations of four solar-type (F7-G5) stars-HD 79498, HD 155358, HD 197037, and HD 220773-taken as part of the McDonald Observatory Planet Search Program. For each of these stars, we see evidence of Keplerian motion caused by the presence of one or more gas giant planets in long-period orbits. We derive orbital parameters for each system and note the properties (composition, activity, etc.) of the host stars. While we have previously announced the two-gas-giant HD 155358 system, we now report a shorter period for planet c. This new period is consistent with the planets being trapped in mutual 2:1 mean-motion resonance. We therefore perform an in-depth stability analysis, placing additional constraints on the orbital parameters of the planets. These results demonstrate the excellent long-term RV stability of the spectrometers on both the Harlan J. Smith 2.7 m telescope and the Hobby-Eberly telescope.
    Department
    Astronomy
    Subject
    astrobiology
    planetary systems
    planets and satellites: dynamical
    evolution and stability
    stars: individual (hd 79498, hd 155358, hd
    197037, hd 220773)
    techniques: radial velocities
    hobby-eberly telescope
    optimized interstellar beacons
    main-sequence
    stars
    extrasolar planets
    trojan asteroids
    solar-system
    host stars
    gas giants
    migration
    evolution
    astronomy & astrophysics
    URI
    http://hdl.handle.net/2152/34851
    Citation
    Robertson, Paul, Michael Endl, William D. Cochran, Phillip J. MacQueen, Robert A. Wittenmyer, J. Horner, Erik J. Brugamyer, Attila E. Simon, Stuart I. Barnes, and Caroline Caldwell. "The McDonald Observatory Planet Search: New Long-period Giant Planets and Two Interacting Jupiters in the HD 155358 System." The Astrophysical Journal, Vol. 749, No. 1 (Apr., 2012): 39.
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