The 55 Cancri System: Fundamental Stellar Parameters, Habitable Zone Planet, and Super-Earth Diameter
von Braun, K. · Boyajian, T. S. · Brummelaar, T. A. ten · van Belle, G. T. · Kane, S. R. · Ciardi, D. R. · Lopez-Morales, M. · McAlister, H. A. · Schaefer, G. · Ridgway, S. T. · Sturmann, L. · Sturmann, J. · White, R. · Turner, N. H. · Farrington, C. · Goldfinger, P. J.
Original · EN
The bright star 55 Cancri is known to host five planets, including a transiting super-Earth. We use the CHARA Array to directly determine the following of 55 Cnc's stellar astrophysical parameters: R=0.943 ± 0.010 R, T EFF = 5196 ± 24 K. Planet 55 Cnc f (M i = 0.155 MJupiter) spends the majority of the duration of its elliptical orbit in the circumstellar habitable zone (0.67--1.32 AU) where, with moderate greenhouse heating, it could harbor liquid water. Our determination of 55 Cancri's stellar radius allows for a model-independent calculation of the physical diameter of the transiting super-Earth 55 Cnc e (≃ 2.1 R), which, depending on the assumed literature value of planetary mass, implies a bulk density of 0.76 ρ or 1.07 ρ.
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