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

C. Obermeier, J. Steuer, H. Kellermann, R. P. Saglia, Th Henning, A. Riffeser, U. Hopp, G. Stefansson, C. Cañas, J. Ninan, S. Mahadevan, H. Isaacson, A. W. Howard, J. Livingston, J. Koppenhoefer, R. Bender

Research output: Contribution to journalArticlepeer-review

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 RJ and mass of 0.592-0.129+0.0165 MJ, 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 RJ and a mass of 0.731-0.311+0.0541 MJ, 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.

Original languageEnglish (US)
Article numberA130
JournalAstronomy and Astrophysics
Volume639
DOIs
StatePublished - Jul 1 2020

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

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