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    Doppler Tomography Of Transiting Exoplanets: A Prograde, Low-Inclined Orbit For The Hot Jupiter CoRoT-11B

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    Date
    2012-07
    Author
    Gandolfi, D.
    Cameron, A. C.
    Endl, M.
    Lanza, A. F.
    Damiani, C.
    Alonso, R.
    Cochran, W. D.
    Deleuil, M.
    Fridlund, M.
    Hatzes, A. P.
    Guenther, E. W.
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    Abstract
    We report the detection of the Doppler shadow of the transiting hot Jupiter CoRoT-11b. Our analysis is based on line-profile tomography of time-series, Keck/HIRES high-resolution spectra acquired during the transit of the planet. We measured a sky-projected, spin-orbit angle lambda = 0.1 degrees +/- 2.6 degrees, which is consistent with a very low-inclined orbit with respect to the stellar rotation axis. We refined the physical parameters of the system using a Markov chain Monte Carlo simultaneous fitting of the available photometric and spectroscopic data. An analysis of the tidal evolution of the system shows how the currently measured obliquity and its uncertainty translate into an initial absolute value of less than about 10 degrees on the zero-age main sequence, for an expected average modified tidal quality factor of the star < Q'(*)> greater than or similar to 4 x 10(6). This is indicative of an inward migration scenario that would not have perturbed the primordial low obliquity of CoRoT-11b. Taking into account the effective temperature and mass of the planet host star (T-eff = 6440 K, M-* = 1.23 M-circle dot), the system can be considered a new telling exception to the recently proposed trend, according to which relatively hot and massive stars (T-eff > 6250 K, M-* > 1.2 M-circle dot) seem to be preferentially orbited by hot Jupiters with high obliquity.
    Department
    Astronomy
    Subject
    planet-star interactions
    planet-disk interactions
    planetary systems
    binaries: eclipsing
    stars: individual: corot-11
    extrasolar planetary systems
    line-profile tomography
    gas-giant planet
    f-star
    inclinations
    migration
    hat-p-9b
    velocity
    wasp-3b
    curves
    astronomy & astrophysics
    URI
    http://hdl.handle.net/2152/34563
    xmlui.dri2xhtml.METS-1.0.item-citation
    Gandolfi, Davide, A. Collier Cameron, Michael Endl, Antonino F. Lanza, Cilia Damiani, Roi Alonso, William D. Cochran et al. >Doppler tomography of transiting exoplanets: a prograde, low-inclined orbit for the hot Jupiter CoRoT-11b.> Astronomy & Astrophysics, Vol. 543 (Jul., 2012): L5.
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    • facebook
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    • CONTACT US
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