HAT-P-67b: An Extremely Low Density Saturn Transiting an F-subgiant Confirmed via Doppler Tomography

  title={HAT-P-67b: An Extremely Low Density Saturn Transiting an F-subgiant Confirmed via Doppler Tomography},
  author={G. Zhou and G'asp'ar 'A. Bakos and Joel D. Hartman and David W. Latham and Guillermo Torres and W. Bhatti and Kaloyan Penev and Lars A. Buchhave and G. Kov'acs and Allyson Bieryla and Samuel N. Quinn and Howard T. Isaacson and Benjamin J. Fulton and Emilio E. Falco and Zolt{\'a}n Csubry and Mark E. Everett and Tamas Szklenar and Gilbert A. Esquerdo and Perry L. Berlind and M. Calkins and Bence B'eky and Russell P. Knox and Phillip M. Hinz and Elliott P. Horch and Lea A. Hirsch and Steve B. Howell and Robert W. Noyes and Geoffrey W. Marcy and Miguel de Val-Borro and J'ozsef L'az'ar and Istv{\'a}n Papp and P'al S'ari},
  journal={The Astronomical Journal},
We report the discovery of HAT-P-67b, which is a hot-Saturn transiting a rapidly rotating F-subgiant. HAT-P-67b has a radius of R_p = 2.085^(+0.096)_(-0.071) R_J, and orbites a M* = 1.642^(+0.155)_(-0.072) M⊙, R* = 2.546^(+0.099)_(-0.084) R⊙ host star in a ~4.81 day period orbit. We place an upper limit on the mass of the planet via radial velocity measurements to be M_p 0.056 M_J by limitations on Roche lobe overflow. Despite being a subgiant, the host star still exhibits relatively rapid… 
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