The physics of stars and planets are closely connected topics. The Sun, as well as other stars, has an enormous influence on its planets. Intense radiation at short wavelengths (X-ray - UV) drives thermal escape processes, whereas stellar winds and CMEs lead to non-thermal escape processes, especially on non- or weakly magnetized planets. Therefore, the properties and evolution of stellar activity has important consequences for the properties and evolution of planets, and consequently, habitability.

The solar-stellar analogy provides an important basis for the study and understanding of stellar activity phenomena and their impact on planets. In the same way as we can learn about other stars though the detailed observations possible for the Sun, observation of stellar activity can in turn provide valuable information on the evolution of stars, and therefore the history of our Sun and the solar system.

Research topics

Properties of active stars

  • solar-stellar analogy
  • flares, prominences and CMEs
  • flaring Sun as proxy for young stars
  • activity diagnostics in different wavelength regimes: optical, FUV, Radio
  • Observational data

Stars: ESO-VLT (Optical), UTR-2 (Radio), GMRT (Radio), EVLA (Radio), FUSE (FUV) Sun: TIMED, CDS

Extrasolar planets

  • transit lightcurve analyses
  • planetary atmospheres: modelling of thermal escape
  • response of planetary atmospheres to stellar activity
  • Observational data

Exoplanets :CoRoT, MOST, Kepler

Planetary atmosheres: CHAMP, ...