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    Transiting Exoplanets From The CoRoT Space Mission XXIII. CoRoT-21B: A Doomed Large Jupiter Around A Faint Subgiant Star

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    Date
    2012-09
    Author
    Patzold, M.
    Endl, M.
    Csizmadia, S.
    Gandolfi, D.
    Jorda, L.
    Grziwa, S.
    Carone, L.
    Pasternacki, T.
    Aigrain, S.
    Almenara, J. M.
    Alonso, R.
    Auvergne, M.
    Baglin, A.
    Barge, P.
    Bonomo, A. S.
    Borde, P.
    Bouchy, F.
    Cabrera, J.
    Cavarroc, C.
    Cochran, W. B.
    Deleuil, M.
    Deeg, H. J.
    Diaz, R.
    Dvorak, R.
    Erikson, A.
    Ferraz-Mello, S.
    Fridlund, M.
    Gillon, M.
    Guillot, T.
    Hatzes, A.
    Hebrard, G.
    Leger, A.
    Llebaria, A.
    Lammer, H.
    MacQueen, P. J.
    Mazeh, T.
    Moutou, C.
    Ofir, A.
    Ollivier, M.
    Parviainen, H.
    Queloz, D.
    Rauer, H.
    Rouan, D.
    Santerne, A.
    Schneider, J.
    Tingley, B.
    Weingrill, J.
    Wuchterl, G.
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    Abstract
    CoRoT-21, a F8IV star of magnitude V = 16 mag, was observed by the space telescope CoRoT during the Long Run 01 ( LRa01) in the first winter field (constellation Monoceros) from October 2007 to March 2008. Transits were discovered during the light curve processing. Radial velocity follow-up observations, however, were performed mainly by the 10-m Keck telescope in January 2010. The companion CoRoT-21b is a Jupiter-like planet of 2.26 +/- 0.33 Jupiter masses and 1.30 +/- 0.14 Jupiter radii in an circular orbit of semi-major axis 0.0417 +/- 0.0011 AU and an orbital period of 2.72474 +/- 0.00014 days. The planetary bulk density is ( 1.36 +/- 0.48) x 10(3) kg m(-3), very similar to the bulk density of Jupiter, and follows an M-1/3 - R relation like Jupiter. The F8IV star is a sub-giant star of 1.29 +/- 0.09 solar masses and 1.95 +/- 0.2 solar radii. The star and the planet exchange extreme tidal forces that will lead to orbital decay and extreme spin-up of the stellar rotation within 800 Myr if the stellar dissipation is Q(*)/k2(*) <= 107.
    Department
    McDonald Observatory
    Subject
    planetary systems
    planet-star interactions
    in extrasolar planets
    tidal evolution
    hot-jupiter
    giant planet
    light
    curves
    search
    orbit
    dwarf
    solar
    metallicity
    astronomy & astrophysics
    URI
    http://hdl.handle.net/2152/34468
    Citation
    Pätzold, M., M. Endl, Sz Csizmadia, D. Gandolfi, L. Jorda, S. Grziwa, Ludmila Carone et al. >Transiting exoplanets from the CoRoT space mission-XXIII. CoRoT-21b: a doomed large Jupiter around a faint subgiant star.> Astronomy & Astrophysics, Vol. 545 (Sep., 2012): A6.
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