Discovery of three new transiting hot Jupiters: WASP-161 b, WASP-163 b and WASP-170 b

Abstract

We present the discovery by the WASP-South transit survey of three new transiting hot Jupiters, WASP-161 b, WASP-163 b and WASP-170 b. Follow-up radial velocities obtained with the Euler/CORALIE spectrograph and high-precision transit light curves obtained with the TRAPPIST-North, TRAPPIST-South, SPECULOOS-South, NITES, and Euler telescopes have enabled us to determine the masses and radii for these transiting exoplanets. WASP-161\,b completes an orbit around its $V=11.1$ F6V-type host star in 5.406 days, and has a mass and radius of $2.5\pm 0.2$$M_{Jup}$ and $1.14\pm 0.06$ $R_{Jup}$ respectively. WASP-163\,b has an orbital period of 1.609 days, a mass of $1.9\pm 0.2$ $M_{Jup}$, and a radius of $1.2\pm 0.1$ $R_{Jup}$. Its host star is a $V=12.5$ G8-type dwarf. WASP-170\,b is on a 2.344 days orbit around a G1V-type star of magnitude $V=12.8$. It has a mass of $1.7\pm 0.2$ $M_{Jup}$ and a radius of $1.14\pm 0.09$ $R_{Jup}$. Given their irradiations ($\sim 10^9$ erg.s${}^{-1}$.cm${}^{-2}$) and masses, the three new planets sizes are in good agreement with classical structure models of irradiated giant planets.

14 pages, 7 figures, Accepted for publication in Astronomical Journal