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        The hot-Jupiter Kepler-17b : Discovery, obliquity from stroboscopic starspots, and atmospheric characterization

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        Author
        Désert, J.-M.
        Charbonneau, D.
        Ballard, S.
        Carter, J.A.
        Quinn, S.N.
        Fressin, F.
        Latham, D.W.
        Torres, G.
        Lissauer, J.J.
        Sasselov, D.D.
        Demory, B.-O.
        Seager, S.
        Winn, J.N.
        Fortney, J.J.
        Fabrycky, D.C.
        Cochran, W.D.
        Endl, M.
        MacQueen, P.J.
        Isaacson, H.T.
        Knutson, H.A.
        Marcy, G.W.
        Buchhave, L.A.
        Bryson, S.T.
        Rowe, J.F.
        Borucki, W.J.
        Christiansen, J.L.
        Haas, M.R.
        Koch, D.
        Batalha, N.M.
        Brown, T.M.
        Caldwell, D.A.
        Jenkins, J.M.
        Mullally, F.
        Tenenbaum, P.
        Deming, D.
        Ford, E.B.
        Gilliland, R.L.
        Gillon, M.
        Kinemuchi, K.
        Still, M.
        Lucas, P.W.
        Uddin, K.
        Attention
        2299/7201
        Abstract
        This paper reports the discovery and characterization of the transiting hot giant exoplanet Kepler-17b. The planet has an orbital period of 1.486 days, and radial velocity measurements from the Hobby-Eberly Telescope show a Doppler signal of 419.5 m s. From a transit-based estimate of the host star's mean density, combined with an estimate of the stellar effective temperature T = 5630 ± 100 from high-resolution spectra, we infer a stellar host mass of 1.06 ± 0.07 M and a stellar radius of 1.02 ± 0.03R . We estimate the planet mass and radius to be M = 2.45 0.11 M and R = 1.31 ± 0.02R . The host star is active, with dark spots that are frequently occulted by the planet. The continuous monitoring of the star reveals a stellar rotation period of 11.89 days, eight times the planet's orbital period; this period ratio produces stroboscopic effects on the occulted starspots. The temporal pattern of these spot-crossing events shows that the planet's orbit is prograde and the star's obliquity is smaller than 15°. We detected planetary occultations of Kepler-17b with both the Kepler and Spitzer Space Telescopes. We use these observations to constrain the eccentricity, e, and find that it is consistent with a circular orbit (e < 0.011). The brightness temperatures of the planet's infrared bandpasses are = 1880 ± 100 K and = 1770 ± 150 K. We measure the optical geometric albedo A in the Kepler bandpass and find A = 0.10 ± 0.02. The observations are best described by atmospheric models for which most of the incident energy is re-radiated away from the day side.
        Publication date
        2011-11-01
        Published in
        Astrophysical Journal, Supplement Series
        Published version
        https://doi.org/10.1088/0067-0049/197/1/14
        Other links
        http://hdl.handle.net/2299/7201
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