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Bieryla A.,Harvard - Smithsonian Center for Astrophysics | Hartman J.D.,Princeton University | Bakos G.A.,Princeton University | Bhatti W.,Princeton University | And 20 more authors.
Astronomical Journal | Year: 2014

We report the discovery of the transiting extrasolar planet HAT-P-49b. The planet transits the bright (V = 10.3) slightly evolved F-star HD 340099 with a mass of 1.54 M⊙and a radius of 1.83 R ⊙ . HAT-P-49b is orbiting one of the 25 brightest stars to host a transiting planet which makes this a favorable candidate for detailed follow-up. This system is an especially strong target for Rossiter-McLaughlin follow-up due to the host star's fast rotation, 16 km s-1. The planetary companion has a period of 2.6915 days, mass of 1.73 M J, and radius of 1.41 R J. The planetary characteristics are consistent with that of a classical hot Jupiter but we note that this is the fourth most massive star to host a transiting planet with both Mp and Rp well determined. © 2014. The American Astronomical Society. All rights reserved.. Source


Huang C.X.,Princeton University | Hartman J.D.,Princeton University | Bakos G.A.,Princeton University | Penev K.,Princeton University | And 16 more authors.
Astronomical Journal | Year: 2015

We report the discovery of HAT-P-56b by the HATNet survey, an inflated hot Jupiter transiting a bright F-type star in Field 0 of NASA's K2 mission. We combine ground-based discovery and follow-up light curves with high precision photometry from K2, as well as ground-based radial velocities from the Tillinghast Reflector Echelle Spectrograph on the Fred Lawrence Whipple Observatory 1.5 m telescope to determine the physical properties of this system. HAT-P-56b has a mass of 2.18 , radius of 1.47 , and transits its host star on a near-grazing orbit with a period of 2.7908 day. The radius of HAT-P-56b is among the largest known for a planet with . The host star has a V-band magnitude of 10.9, mass of 1.30 , and radius of 1.43 . The periodogram of the K2 light curve suggests that the star is a γ Dor variable. HAT-P-56b is an example of a ground-based discovery of a transiting planet, where space-based observations greatly improve the confidence in the confirmation of its planetary nature, and also improve the accuracy of the planetary parameters. © 2015. The American Astronomical Society. All rights reserved.. Source


Juncher D.,Copenhagen University | Buchhave L.A.,Copenhagen University | Buchhave L.A.,Harvard - Smithsonian Center for Astrophysics | Hartman J.D.,Princeton University | And 16 more authors.
Publications of the Astronomical Society of the Pacific | Year: 2015

We report the discovery of a new transiting extrasolar planet, HAT-P-55b. The planet orbits a V = 13.207 ± 0:039 sun-like star with a mass of 1.013 ± 0.037 M, a radius of 1:011 ± 0.036 R, and a metallicity of 0.03 ± 0:08. The planet itself is a typical hot Jupiter with a period of 3.5852467 ± 0.0000064 days, a mass of 0.582 ± 0.056 MJ and a radius of 1.182 ± 0.055 RJ. This discovery adds to the increasing sample of transiting planets with measured bulk densities, which is needed to put constraints on models of planetary structure and formation theories. © 2015, The Astronomical Society of the Pacific. All rights reserved. Source

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