We have used the Spitzer Space Telescope to observe two transiting planetary systems orbiting low-mass stars discovered in the Kepler K2 mission. The system K2-3 (EPIC 201367065) hosts three planets, while K2-26 (EPIC 202083828) hosts a single planet. Observations of all four objects in these two systems confirm and refine the orbital and physical parameters of the planets. The refined orbital information and more precise planet radii possible with Spitzer will be critical for future observations of these and other K2 targets. For K2-3b we find marginally significant evidence for a transit timing variation between the K2 and Spitzer epochs.
The Astrophysical Journal
- Pub Date:
- May 2016
- planets and satellites: dynamical evolution and stability;
- planets and satellites: gaseous planets;
- Astrophysics - Earth and Planetary Astrophysics
- accepted for Astrophysical Journal