Main PLATO targets exhibit short- and long-term activity variability. Knowledge about a star's activity pattern, e.g., cycle length and amplitude, and the momentary status of activity within this pattern during PLATO observing campaigns, is fundamental for the correct interpretation of photometric variability, RV follow-up, and estimates of stellar age. Together with WP 145, we are planning...
We summarize how we can reach the goals of PLATO in characterization of exoplanets. We show how the instrumental and stellar noise can be removed from the light curves, how PLATO Exoplanet Analysis System will work and how the algorithms defined in Plato Science Management and how the responsible work package WP 114 works.
The goal of the PLATO WP 115100 "Astrophysical Noise Sources" is to understand the effects that astrophysical noise, in particular manifestations of stellar activity, has on the radial velocity follow-up of planet candidates discovered by PLATO, and to outline mitigation procedures.
I will present a possible approach informed by X-ray observations of stars, including the multi-year all-sky...
The advent of modern photometric monitoring space missions has boosted
studies of stellar flares. Such events are key signatures of magnetic
activity on late-type stars, and important diagnostics for our understanding
of coronal physics as well as the evolution of planet atmospheres. These latter
ones are irradiated and heated by flares, possibly to the point of atmospheric
erosion and...
The PMC Calibration and Operation Team (PCOT) provides the required support of the PMC to the calibration and operation of the payload as well as monitoring its health. The PCOT Manager (PCOTM) contributes to the Payload System/AIV Support Team and is responsible for all matters related to e.g. Payload User Manual, TM/TC database, calibration parameters and (together with PPT) inputs related...
The rotation period is in general easy to detect in regular and well-modulated light curves of young and active stars. However, despite the success of the Kepler and TESS missions, reliable information on rotation periods for Sun-like stars is still lacking (as in about 75% of stars in the Kepler field). Stars with solar-analog variability exhibit non-periodic light curves, low variability...
The orbits of hot Jupiters are expected to decay through tidal interactions between the planet and host star, and this has been observationally confirmed for at least one system. Measuring this tidal orbital decay via transit timing variations allows us to determine the stellar tidal quality factor, Q*. This poorly-understood parameter governs the timescale of many tidal processes, such as the...
Low-mass exoplanets are showing a diversity in their densities and irradiation conditions, ranging from highly irradiated planets to temperate worlds. To estimate their composition, we have developed an interior structure model that includes self-consistently an atmosphere in radiative-convective equilibrium for water and CO$_{2}$ envelopes. We use the model within a Bayesian adaptive Markov...
During the past decade, exoplanet detections have revealed a vast diversity of planets, particularly in the low-mass regime below 20-30 Earth masses. Mass and radius observations are the main constraints to infer the present-day internal structure of these planets whose knowledge provides a starting point to characterize them and answer many fundamental questions in exoplanetary science: How...
