Extreme Space Weather in Extra-Solar Systems - a Flare Alert Program

0561924 - ASÚ 2023 RIV HR eng J - Článek v odborném periodiku
Hanslmeier, A. - Leitzinger, M. - Greimel, R. - Odert, P. - Ratzka, T. - Brajša, R. - Guenther, E.W. - Korhonen, H. - Pribulla, T. - Šlechta, Miroslav - Vida, K. - Güdel, H.U. - Heinzel, Petr - Lammer, H. - Ribas, I.
Extreme Space Weather in Extra-Solar Systems - a Flare Alert Program.
Central European Astrophysical Bulletin. Roč. 41, č. 2 (2017), s. 67-78. ISSN 1845-8319
Institucionální podpora: RVO:67985815
Klíčová slova: stellar activity * planetary habitability * stellar evolution
Obor OECD: Astronomy (including astrophysics,space science)
Způsob publikování: Omezený přístup
https://oh.geof.unizg.hr/images/publications/volumes/vol41-2017/2017CEAB4167H.pdf

Highly energetic stellar activity phenomena, such as outbreaks of radiations (flares) and mass expulsions into the helio-/astro-sphere (coronal mass ejections/CMEs), may have a severe impact on the atmospheric evolution of planets. Stellar flare have been studied for decades now and their typical parameters are determined statistically. However, observations of stellar CMEs are rare, yielding only a handful of detections so far. The detection of CMEs on stars demands more observational effort than the detection flares, because the circumstellar environment cannot be spatially resolved like in the Solar System. The most convincing detections up to now were found as Doppler-shifted Balmer line extra-emission/absorption features emerging close to flare events, indicating the rise end ejection of prominence material embedded in the CME core. Dedicated programs aiming for a statistical determination of occurrence rates and the parameters of stellar CMEs are still lacking. Therefore, we propose an innovative and efficient observational approach to search for and characterize CMEs on Sun-like and late-type pre-main sequence and main sequence stars to determine stellar CME parameters and their occurrence rates as a function of stellar spectral type and age, as well as establish a stellar flare/CME association rate, for the first time ever.


Trvalý link: https://hdl.handle.net/11104/0334347