HATS-15 b and HATS-16 b: Two massive planets transiting old G dwarf stars

Abstract

We report the discovery of HATS-15 b and HATS-16 b, two massive transiting extrasolar planets orbiting evolved ($\sim 10$ Gyr) main-sequence stars. The planet HATS-15 b, which is hosted by a G9V star ($V=14.8$ mag), is a hot Jupiter with mass of $2.17\pm 0.15M_{\mathrm{J}}$ and radius of $1.105\pm \mathrm{0.0.040}{R}_{\mathrm{J}}$, and completes its orbit in nearly 1.7 days. HATS-16 b is a very massive hot Jupiter with mass of $3.27\pm 0.19M_{\mathrm{J}}$ and radius of $1.30\pm 0.15R_{\mathrm{J}}$; it orbits around its G3 V parent star ($V=13.8$ mag) in $\sim 2.7$ days. HATS-16 is slightly active and shows a periodic photometric modulation, implying a rotational period of 12 days which is unexpectedly short given its isochronal age. This fast rotation might be the result of the tidal interaction between the star and its planet.

16 pages, 8 figures, submitted to PASP

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