• DOI:10.1088/0004-6256/149/4/149
• Corpus ID: 119239193

HAT-P-54b: A Hot Jupiter Transiting a 0.6 M⊙ Star in Field 0 of the K2 Mission

@article{GABakos2015HATP54bAH,
  title={HAT-P-54b: A Hot Jupiter Transiting a 0.6 M⊙ Star in Field 0 of the K2 Mission},
  author={G.'A.Bakos and J.D.Hartman and W.Bhatti and A.Bieryla and Miguel de Val-Borro and D.W.Latham and L.A.Buchhave and Z.Csubry and K.Penev and G.Kov'acs and B.B'eky and E.Falco and T.Kov'acs and A.W.Howard and J.A.Johnson and H.Isaacson and G.W.Marcy and G.Torres and R.W.Noyes and P.Berlind and M.L.Calkins and G.A.Esquerdo and J.L'az'ar and I.Papp and P. S'ari Princeton University and Harvard-Smithsonian Center for Astrophysics University of Copenhagen and Konkoly Observatory and University of North Dakota and Ifa and Hawaii and Ucb and Hungarian Astronomical Association and Sloan Fellow and Packard Fellow},
  journal={The Astronomical Journal},
  year={2015},
  volume={149},
  pages={149}
}

• G.'A.Bakos, J.D.Hartman, +31 authors P. Fellow
• Published 17 April 2014
• Physics, Geology
• The Astronomical Journal

We report the discovery of HAT-P-54b, a planet transiting a late K dwarf star in field 0 of the NASA K2 mission. We combine ground-based photometric light curves with radial velocity measurements to determine the physical parameters of the system. HAT-P-54b has a mass of 0.760 ± 0.032 M_J, a radius of 0.944 ± 0.028 R_J, and an orbital period of 3.7998 days. The star has V=13.505 ± 0.060, a mass of 0.645 ± 0.020 M_⊙, a radius of 0.617 ± 0.013 R_⊙, an effective temperature of T_(eff*) = 4390 ± 50, and a subsolar metallicity of [Fe/H] = -0.127 ± 0.080. We also detect a periodic signal with P = 15.6 days and 5.6 mmag amplitude in the light curve, which we interpret as due to the rotation of the star. HAT-P-54b has a radius that is smaller than 92% of the known transiting planets with masses greater than that of Saturn, while HAT-P-54 is one of the lowest-mass stars known to host a hot Jupiter. Follow-up high-precision photometric observations by the K2 mission promise to make this a well-studied planetary system.