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Abstract

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 4000−24 000 Å 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 ^+0.0061 R_J and mass of 0.592_−0.129 ^+0.0165 M_J, orbiting a K7V dwarf star at a period of 2.66 d, and has an estimated surface temperature of about 1727₋₉₀ ⁺⁷⁸ K. Wendelstein-2b is a hot Jupiter with a radius of 1.1592_−0.0210 ^+0.0204 R_J and a mass of 0.731<sub>−0.311</sup> ^+0.0541 M_J, orbiting a K6V dwarf star at a period of 1.75 d, and has an estimated surface temperature of about 1852₋₁₄₀ ⁺¹²⁰ K. 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.