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Following the TraCS of exoplanets with Pan-Planets: Wendelstein-1b and Wendelstein-2b

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Obermeier,  C.
Optical and Interpretative Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

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Steuer,  J.
Optical and Interpretative Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

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Kellermann,  H.
Optical and Interpretative Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

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Saglia,  R. P.
Optical and Interpretative Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

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Hopp,  U.
Optical and Interpretative Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

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Koppenhoefer,  J.
Optical and Interpretative Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

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Bender,  R.
Optical and Interpretative Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

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Citation

Obermeier, C., Steuer, J., Kellermann, H., Saglia, R. P., Henning, T., Riffeser, A., et al. (2020). Following the TraCS of exoplanets with Pan-Planets: Wendelstein-1b and Wendelstein-2b. Astronomy and Astrophysics, 639: A130. doi:10.1051/0004-6361/202037715.


Cite as: http://hdl.handle.net/21.11116/0000-0007-30C2-7
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<sub>−0.0061</sub> <sup>+0.0061</sup> R<sub>J</sub> and mass of 0.592<sub>−0.129</sub> <sup>+0.0165</sup> M<sub>J</sub>, orbiting a K7V dwarf star at a period of 2.66 d, and has an estimated surface temperature of about 1727<sub>−90</sub> <sup>+78</sup> K. Wendelstein-2b is a hot Jupiter with a radius of 1.1592<sub>−0.0210</sub> <sup>+0.0204</sup> R<sub>J</sub> and a mass of 0.731<sub>−0.311</sup> <sup>+0.0541</sup> M<sub>J</sub>, orbiting a K6V dwarf star at a period of 1.75 d, and has an estimated surface temperature of about 1852<sub>−140</sub> <sup>+120</sup> 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.