WASP-104b and WASP-106b: two transiting hot Jupiters in 1.75-day and 9.3-day orbits

TL;DR

This paper reports the discovery of two transiting hot Jupiters, WASP-104b and WASP-106b, with short and moderate orbital periods, respectively, orbiting bright stars, and provides their physical and orbital characteristics.

Contribution

It presents the discovery and characterization of two new hot Jupiter exoplanets with unique orbital periods from the WASP survey.

Findings

WASP-104b orbits in 1.75 days with a mass of 1.27 M_Jup.

WASP-106b orbits in 9.29 days with a mass of 1.93 M_Jup.

Both planets are slightly larger than Jupiter and have circular orbits.

Abstract

We report the discovery from the WASP survey of two exoplanetary systems, each consisting of a Jupiter-sized planet transiting an 11th magnitude (V) main-sequence star. WASP-104b orbits its star in 1.75 d, whereas WASP-106b has the fourth-longest orbital period of any planet discovered by means of transits observed from the ground, orbiting every 9.29 d. Each planet is more massive than Jupiter (WASP-104b has a mass of $1.27 \pm 0.05 \mathrm{M_{Jup}}$, while WASP-106b has a mass of $1.93 \pm 0.08 \mathrm{M_{Jup}}$). Both planets are just slightly larger than Jupiter, with radii of $1.14 \pm 0.04$ and $1.09 \pm 0.04 \mathrm{R_{Jup}}$ for WASP-104 and WASP-106 respectively. No significant orbital eccentricity is detected in either system, and while this is not surprising in the case of the short-period WASP-104b, it is interesting in the case of WASP-106b, because many otherwise similar planets are known to have eccentric orbits.