HATS-5b: A Transiting Hot Saturn from the HATSouth Survey

Zhou, G. and Bayliss, D. and Penev, K. and Bakos, G. Á. and Hartman, J. D. and Jordán, A. and Mancini, L. and Mohler, M. and Csubry, Z. and Ciceri, S. and Brahm, R. and Rabus, M. and Buchhave, L. and Henning, T. and Suc, V. and Espinoza, N. and Béky, B. and Noyes, R. W. and Schmidt, B. and Butler, R. P. and Shectman, S. and Thompson, I. and Crane, J. and Sato, B. and Csák, Balázs and Lázár, J. and Papp, I. and Sári, P. and Nikolov, N. (2014) HATS-5b: A Transiting Hot Saturn from the HATSouth Survey. ASTRONOMICAL JOURNAL, 147 (6). ISSN 0004-6256

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Abstract

We report the discovery of HATS-5b, a transiting hot-Saturn orbiting a G type star, by the HAT- South survey. HATS-5b has a mass of Mp ≈ 0.24 MJ, radius of Rp ≈ 0.91 RJ, and transits its host star with a period of P ≈ 4.7634 d. The radius of HATS-5b is consistent with both theoretical and empirical models. The host star has a V band magnitude of 12.6, mass of 0.94 M⊙, and radius of 0.87 R⊙. The relatively high scale height of HATS-5b, and the bright, photometrically quiet host star, make this planet a favourable target for future transmission spectroscopy follow-up observations. We reexamine the correlations in radius, equilibrium temperature, and metallicity of the close-in gas- giants, and find hot Jupiter-mass planets to exhibit the strongest dependence between radius and equilibrium temperature. We find no significant dependence in radius and metallicity for the close-in gas-giant population.

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