WE-Heraeus Conference "Exoplanets: Bridging the gap between theory and observations"

Katja Poppenhaeger (Invited speaker)

Activity: Talk or presentation typesInvited or keynote talk at national or international conference


Invited talk "Interactions between exoplanets and their host stars".
Exoplanets are found around their host stars in a vast variety of orbits, many of them being much closer to the central star than any planets in our own solar system. Such close proximity can cause observable interactions between stars and exoplanets. Effects on the planetary atmosphere caused by the star are one obvious type of interaction; more surprising are effects that the exoplanet may have on the host star itself. From a theoretical standpoint, two main regimes come to mind: magnetic interactions, where the magnetosphere of the exoplanet can disturb, reconnect with, or trigger changes in magnetic loops of the stellar corona; and tidal interactions, where the gravitational interaction of exoplanets where the orbital period is non-synchronized with the stellar rotation may lead to angular momentum transfer and increased turbulence in the stellar photosphere. From an observational standpoint, testing if any of those interaction types is present to a significant degree in a given exoplanetary system is not an easy task. Many observables expected from such interactions look similar or even identical to the stochastic changes caused by stellar activity that is observed for all cool stars. Observational studies therefore need to be designed carefully to avoid observational biases and sampling effects. I will present the theoretical underpinnings and currently available observational evidence for interactions between stars and exoplanets and outline how such interactions can influence the habitability of exoplanets.
Period30 Nov 2016
Event titleWE-Heraeus Conference "Exoplanets: Bridging the gap between theory and observations"
Event typeConference
LocationBonn, Germany