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Seismology of the Sun and the Distant Stars 2016
Using Today’s Successes to Prepare the Future
Joint TASC2 & KASC9 Workshop – SPACEINN & HELAS8 Conference

Understanding Rogue Waves on Pulsating White Dwarfs
J.J. Hermes (University of North Carolina at Chapel Hill)

Kepler and K2 have uncovered a completely unexpected new physical phenomenon in pulsating stars: large-amplitude outbursts in the coolest ZZ Cetis (hydrogen-atmosphere pulsating white dwarfs). The outbursts are essentially rogue waves, sporadically increases the overall stellar brightness by up to 15%. We have now discovered four outbursting white dwarfs, all confined to a narrow range of temperatures at the red edge of the ZZ Ceti instability strip. These outbursts are providing fresh insight into pulsation energy transfer via nonlinear resonances, as well as the eventual cessation of pulsations in cool white dwarfs.

Instituto de Astrofísica e Ciências do Espaço Universidade do Porto Faculdade de Ciências da Universidade de Lisboa
Fundação para a Ciência e a Tecnologia COMPETE 2020 PORTUGAL 2020 União Europeia