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

TL;DR

This paper reports the discovery and characterization of three new transiting hot Jupiters, providing their masses, radii, and orbital parameters, and confirming their consistency with classical models of irradiated giant planets.

Contribution

The paper presents the discovery and detailed characterization of three new hot Jupiters using combined transit and radial velocity data, expanding the known population of such exoplanets.

Findings

All three planets have sizes consistent with classical irradiated giant planet models.

The planets have orbital periods ranging from 1.6 to 5.4 days.

The masses of the planets are between 1.7 and 2.5 Jupiter masses.

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 $1.9\pm0.2$ $M_{Jup}$, and a radius of $1.2\pm0.1$ $R_{Jup}$. 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 $1.7\pm0.2$ $M_{Jup}$ and a radius of $1.14\pm0.09$ $R_{Jup}$. Given their irradiations ($\sim10^9$ erg.s$^{-1}$.cm$^{-2}$) and masses, the three new planets sizes are in good agreement with classical structure models of irradiated giant planets.