Jonathan Labadie-Bartz

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We report the discovery of KELT-20b, a hot Jupiter transiting a V 7.6 ~ early A star, HD 185603, with an orbital period of P 3.47  days. Archival and follow-up photometry, Gaia parallax, radial velocities, Doppler tomography, and AO imaging were used to confirm the planetary nature of KELT-20b and characterize the system. From global modeling we infer that(More)
We announce the discovery of KELT-16b, a highly irradiated, ultra-short period hot Jupiter transiting the relatively bright (V=11.7) star TYC 2688-1839-1/KELT-16. A global analysis of the system shows KELT-16 to be an F7V star with =  T 6236 54 eff K,  = + g log 4.253 0.036 , = + Fe H 0.002 0.085 0.086 [ ] ,  =  M M 1.211 0.046 0.043 , and  = R +  R(More)
The amount of ultraviolet irradiation and ablation experienced by a planet depends strongly on the temperature of its host star. Of the thousands of extrasolar planets now known, only six have been found that transit hot, A-type stars (with temperatures of 7,300-10,000 kelvin), and no planets are known to transit the even hotter B-type stars. For example,(More)
We announce the discovery of KELT-12b, a highly inflated Jupiter-mass planet transiting the mildly evolved, V=10.64 host star TYC 2619-1057-1. We followed up the initial transit signal in the KELT-North survey data with precise ground-based photometry, high-resolution spectroscopy, precise radial velocity measurements, and high-resolution adaptive optics(More)
We report the discovery of a transiting exoplanet, KELT-11b, orbiting the bright (V = 8.0) subgiant HD 93396. A global analysis of the system shows that the host star is an evolved subgiant star with T 5370 51 eff =  K, M 1.438 0.052 0.061 * = + M, R 2.72 0.17 0.21 * = + R, g log 3.727 0.046 0.040 * = + , and Fe H 0.180 0.075 =  [ ] . The planet is a(More)
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