HAT-P-54b: A hot jupiter transiting a 0.64 Msun star in field 0 of the K2 mission

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 $\pm$ 0.032 $M_J$, a radius of 0.944 $\pm$ 0.028 $R_J$, and an orbital period of 3.7998 d. The star has V = 13.505 $\pm$ 0.060, a mass of 0.645 $\pm$ 0.020 $M_{\odot }$, a radius of 0.617 $\pm$ 0.013 $R_{\odot }$, an effective temperature of Teff = 4390 $\pm$ 50K, and a subsolar metallicity of [Fe/H] = -0.127 $\pm$ 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.

Submitted to AJ 2014 April 16

References in corpus (6)

• The Dartmouth Stellar Evolution Database
• EXOFAST: A fast exoplanetary fitting suite in IDL
• HAT-P-7b: An Extremely Hot Massive Planet Transiting a Bright Star in the Kepler Field
• TrES-2: The First Transiting Planet in the Kepler Field
• HAT-P-3b: A heavy-element rich planet transiting a K dwarf star
• WASP-80b: a gas giant transiting a cool dwarf

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• ExoClock project II: A large-scale integrated study with 180 updated exoplanet ephemerides
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• Near-Infrared Transit Photometry of Extra-Solar Planet HAT-P-54b