HAT-P-54b: A Hot Jupiter Transiting a 0.64M⊙ Star in Field 0 of the K2 Mission

Bakos, Gáspár and Hartman, J. D. and Bhatti, W. and Bieryla, A. and de Val-Borro, M. and Csubry, Zoltán and Kovács, Géza and Kovács, Tamás (2015) HAT-P-54b: A Hot Jupiter Transiting a 0.64M⊙ Star in Field 0 of the K2 Mission. ASTRONOMICAL JOURNAL, 149 (4). ISSN 0004-6256

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Abstract

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 MJ, a radius of 0.944 ± 0.028 RJ, and an orbital period of 3.7998 d. 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 Teff⋆ = 4390 ± 50, and a subsolar metallicity of [Fe/H] = −0.127 ± 0.080. 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.

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