Observing bright pulsating white dwarfs with PLATO: A new window into the late stages of stellar evolution

We present a compelling scientific case for leveraging the PLATO mission to study bright pulsating white dwarfs spanning a wide spectral range, encompassing both hydrogen-deficient types (including GW Vir and DBV stars) and hydrogen-rich classes (such as classical DAVs, pulsating extremely low-mass DA white dwarfs, and ultra-massive DA white dwarfs). PLATO’s exceptional photometric precision, long-duration continuous monitoring, and extensive sky coverage promise transformative advances in white dwarf asteroseismology. Our key objectives include probing the internal structure and chemical stratification of white dwarfs, detecting secular changes in pulsation modes over extended timescales, and discovering rare or previously unknown classes of pulsators.To assess feasibility, we constructed a sample of 650 white dwarf candidates ($G \leq 17$) identified within PLATO’s Southern LOPS2 field using the PLATO complementary science catalogue combined with \textit{Gaia} DR3, and derived atmospheric parameters through photometric modeling. This sample comprises 118 DA white dwarfs (including 23 ZZ Ceti candidates), and 41 non-DAs (including 35 DBV candidates). Simulated observations using {\tt PlatoSim} demonstrate that PLATO will be capable of detecting white dwarf pulsation modes with amplitudes as low as $\sim$0.1\,mma, depending on stellar magnitude, observation duration, pixel location, and the number of contributing cameras. We provide detailed detection limits and visibility forecasts for known pulsators across a representative range of these parameters.Furthermore, we emphasize strong synergies with \textit{Gaia} astrometry, TESS photometry, and targeted spectroscopic campaigns, which together will enable robust mode identification and detailed stellar modeling. Collectively, these efforts will unlock unprecedented insights into white dwarf origins, evolution and internal physics, and the fate of their planetary systems.