HATS-17b: A Transiting Hot Giant Planet With .77 Jupiter Radius and 1.34 Jupiter Mass ie the Density of Aluminum

HATS-17b: A Transiting Compact Warm Jupiter in a 16.3 Days Circular Orbit

Authors:

Brahm et al

Abstract:

We report the discovery of HATS-17b, the first transiting warm Jupiter of the HATSouth network. HATS-17b transits its bright (V=12.4) G-type (M⋆=1.131 ± 0.030 M⊙, R⋆=1.091+0.070−0.046 R⋆) metal-rich ([Fe/H]=+0.3 dex) host star in a circular orbit with a period of P=16.2546 days. HATS-17b has a very compact radius of 0.777 ± 0.056 RJ given its Jupiter-like mass of 1.338 ± 0.065 MJ. Up to 50% of the mass of HATS-17b may be composed of heavy elements in order to explain its high density with current models of planetary structure. HATS-17b is the longest period transiting planet discovered to date by a ground-based photometric survey, and is one of the brightest transiting warm Jupiter systems known. The brightness of HATS-17b will allow detailed follow-up observations to characterize the orbital geometry of the system and the atmosphere of the planet.