Convection is ubiquitous in stars and occurs under many different conditions. Here we
explore convection in main-sequence stars through two lenses: dimensionless parameters …

Context. The surface structures and dynamics of cool stars are characterised by the
presence of convective motions and turbulent flows which shape the emergent spectrum …

Context. Stellar activity and convection-related surface structures might cause bias in planet
detection and characterization that use these transits. Surface convection simulations help to …

Context. The G-type star GJ504A is known to host a 3–35 M Jup companion whose
temperature, mass, and projected separation all contribute to making it a test case for planet …

In the past decade the study of exoplanet atmospheres at high-spectral resolution, via
transmission/emission spectroscopy and cross-correlation techniques for atomic/molecular …

Context. High-precision stellar analyses require hydrodynamic modeling to interpret
chemical abundances or oscillation modes. Exoplanet atmosphere studies require stellar …

Context. High-precision stellar analyses require hydrodynamic 3D modeling. Such models
predict changes across stellar disks of spectral line shapes, asymmetries, and wavelength …

Context. Stellar activity causes difficulties in the characterization of transiting exoplanets. In
particular, the magnetic spots present on most exoplanet host stars can lead to false …

High spatial resolution is the key for the understanding various astrophysical phenomena.
But even with the future E-ELT, single dish instruments are limited to a spatial resolution of …

Context. Red giant branch (RGB) stars are very bright objects in galaxies and are often used
as standard candles. Interferometry is the ideal tool to characterize the dynamics and …