2020A&A...639A.130O

Hot Jupiters seem to get rarer with decreasing stellar mass. The goal of the Pan-Planets transit survey was the detection of such planets and a statistical characterization of their frequency. Here, we announce the discovery and validation of two planets found in that survey, Wendelstein-1b and Wendelstein-2b, which are two short-period hot Jupiters that orbit late K host stars. We validated them both by the traditional method of radial velocity measurements with the HIgh Resolution Echelle Spectrometer and the Habitable-zone Planet Finder instruments and then by their Transit Color Signature (TraCS). We observed the targets in the wavelength range of 4000-24000Å and performed a simultaneous multiband transit fit and additionally determined their thermal emission via secondary eclipse observations. Wendelstein-1b is a hot Jupiter with a radius of 1.0314_–0.0061^+0.0061R_J and mass of 0.592_–0.129^+0.0165M_J, orbiting a K7V dwarf star at a period of 2.66d, and has an estimated surface temperature of about 1727_–90⁺⁷⁸K. Wendelstein-2b is a hot Jupiter with a radius of 1.1592_–0.0210^+0.0204R_J and a mass of 0.731_–0.311^+0.0541M_J, orbiting a K6V dwarf star at a period of 1.75 d, and has an estimated surface temperature of about 1852_–140⁺¹²⁰K. With this, we demonstrate that multiband photometry is an effective way of validating transiting exoplanets, in particular for fainter targets since radial velocity follow-up becomes more and more costly for those targets.