München 2019 – wissenschaftliches Programm
EP 9.18: Poster
Donnerstag, 21. März 2019, 16:30–19:00, Durchgangshalle
The effects of stellar activity on orbiting planets — •ADriana Valio — Center for Radio Astronomy and Astrophysics Mackenzie, Mackenzie Presbyterian University, Sao Paulo, Brazil
Stellar activity manifests itself in the form of surface spots and faculae and also by flares and mass ejections from its atmosphere. When an orbiting planet transits in front of the star and occults one of these features, small signatures are imprinted in the transit light curve. These can be modeled to yield the physical characteristics of spots and faculae, such as size, temperature, location, magnetic field, and lifetime. Monitoring of these signatures on multiple transits yield the stellar rotation and differential rotation, and even magnetic cycles for long enough time series. Flares have also been detected from active stars, the impact of the flaring UV flux on possible living organisms in close orbit planets is also discussed. Mass ejections also affect the planetary atmosphere being responsible for atmospheric erosion.