122 citations · 1.1k across the 38 of their papers we have counts for
10 papers · 1 filter
Can 1D radiative equilibrium models of faculae be used for calculating contamination of transmission spectra?
Veronika Witzke, Alexander I. Shapiro, Nadiia M. Kostogryz +5
The reliable characterization of planetary atmospheres with transmission spectroscopy requires realistic modeling of stellar magnetic features, since features that are attributable…
Small-scale dynamo in cool main sequence stars. II. The effect of metallicity
V. Witzke, H. B. Duehnen, A. I. Shapiro +4
All cool main sequence stars including our Sun are thought to have magnetic fields. Observations of the Sun revealed that even in quiet regions small-scale turbulent magnetic field…
Superflares on solar-like stars: A new method for identifying the true flare sources in photometric surveys
Valeriy Vasilyev, Timo Reinhold, Alexander I. Shapiro +5
Over the past years, thousands of stellar flares have been detected by harvesting data from large photometric surveys. These detections, however, do not account for potential sourc…
Measuring periods in aperiodic light curves -- Applying the GPS method to infer rotation periods of solar-like stars
Timo Reinhold, Alexander I. Shapiro, Sami K. Solanki +1
Light curves of solar-like stars are known to show highly irregular variability. As a consequence, standard frequency analysis methods often fail to detect the correct rotation per…
Faculae cancel out on the surfaces of active Suns
N. -E. Nèmec, A. I. Shapiro, E. Işık +5
Surfaces of the Sun and other cool stars are filled with magnetic fields, which are either seen as dark compact spots or more diffuse bright structures like faculae. Both hamper de…
Stellar limb darkening. A new MPS-ATLAS library for Kepler, TESS, CHEOPS, and PLATO passbands
N. M. Kostogryz, V. Witzke, A. I. Shapiro +4
The detection of the first exoplanet paved the way into the era of transit photometry space missions with a revolutionary photometric precision that aim at discovering new exoplane…