# HATS-9b and HATS-10b: Two Compact Hot Jupiters in Field 7 of the K2 Mission

14 May 2015  ·  Brahm R., Jordán A., Hartman J. D., Bakos G. Á., Bayliss D., Penev K., Zhou G., Ciceri S., Rabus M., Espinoza N., Mancini L., de Val-Borro M., Bhatti W., Sato B., Tan T. G., Csubry Z., Buchhave L., Henning T., Schmidt B., Suc V., Noyes R. W., Papp I., Lázár J., Sári P. ·

We report the discovery of two transiting extrasolar planets by the HATSouth survey. HATS-9b orbits an old (10.8 $\pm$ 1.5 Gyr) V=13.3 G dwarf star, with a period P = 1.9153 d. The host star has a mass of 1.03 M$_{\odot}$, radius of 1.503 R$_\odot$ and effective temperature 5366 $\pm$ 70 K. The planetary companion has a mass of 0.837 M$_J$, and radius of 1.065 R$_J$ yielding a mean density of 0.85 g cm$^{-3}$ ... HATS-10b orbits a V=13.1 G dwarf star, with a period P = 3.3128 d. The host star has a mass of 1.1 M$_\odot$, radius of 1.11 R$_\odot$ and effective temperature 5880 $\pm$ 120 K. The planetary companion has a mass of 0.53 M$_J$, and radius of 0.97 R$_J$ yielding a mean density of 0.7 g cm$^{-3}$ . Both planets are compact in comparison with planets receiving similar irradiation from their host stars, and lie in the nominal coordinates of Field 7 of K2 but only HATS-9b falls on working silicon. Future characterisation of HATS-9b with the exquisite photometric precision of the Kepler telescope may provide measurements of its reflected light signature. read more

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Earth and Planetary Astrophysics Solar and Stellar Astrophysics