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Discovery of an Inflated Massive Hot-Jupiter

5 Jul 2015, 23:00 UTC
Discovery of an Inflated Massive Hot-Jupiter
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Figure 1: Artist’s impression of an exoplanet.Combining data from ground-based observations with the exquisite photometric precision of NASA’s re-purposed Kepler space telescope as part of the K2 mission, Huang et al. (2015) present the discovery of HAT-P-56b, an inflated massive hot-Jupiter transiting a bright F-type star. HAT-P-56b has roughly 2.18 times the mass and roughly 1.47 times the radius of Jupiter. It orbits its host star in a close-in orbit with a period of 2.79 days. Due to its proximity to its host star, the dayside of HAT-P-56b is predicted to be intensely irradiated to a temperature of over 1,800 K.The radius of HAT-P-56b is among the largest known for a planet with more than twice the mass of Jupiter. In general, hot-Jupiters with more than twice the mass of Jupiter are less likely to be inflated by the intense irradiation from their host stars. HAT-P-56b does not follow this trend and is one of the few known inflated massive hot-Jupiters. In fact, HAT-P-56b is currently the most inflated hot-Jupiter that is between 1.5 to 4 times the mass of Jupiter.Figure 2: Radial velocity curve of the host star of HAT-P-56b. The amplitude of the radial velocity curve indicates that ...

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