Following the TraCS of exoplanets with Pan-Planets: Wendelstein-1b and Wendelstein-2b
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.
Based on observations obtained with the Hobby-Eberly Telescope, which is a joint project of the University of Texas at Austin, the Pennsylvania State University, Stanford University, Ludwig-Maximilians-Universität München, and Georg-August-Universität Göttingen.- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- July 2020
- DOI:
- 10.1051/0004-6361/202037715
- arXiv:
- arXiv:2005.13560
- Bibcode:
- 2020A&A...639A.130O
- Keywords:
-
- planets and satellites: detection;
- planets and satellites: gaseous planets;
- stars: low-mass;
- techniques: image processing;
- techniques: photometric;
- occultations;
- Astrophysics - Earth and Planetary Astrophysics;
- Astrophysics - Solar and Stellar Astrophysics;
- 85-05
- E-Print:
- 14 pages, 12 figures. Accepted for publication in A&