Las manchas solares, regiones oscuras y frías de la superficie solar, se llevan observando desde hace miles de años. Estas estructuras son grandes concentraciones de campo magnético que inhiben la convección, haciéndolas más frías y oscuras que sus alrededores (Hale 1908). Nos encontramos en un momento especialmente óptimo para el estudio en largas

LiLiMaRlin is a library of libraries of massive-star high-resolution optical spectra built by collecting data from [a] our spectroscopic surveys (OWN, IACOB. NoMaDS, and CAFÉ-BEANS) and programs and [b] searches in public archives. The current version has 18 077 spectra of 1665 stars obtained with seven different telescopes (HET 9.2 m, NOT 2.56 m

Planet host stars with well-constrained ages provide a rare window to the time domain of planet formation and evolution. The NASA K2 mission has enabled the discovery of the vast majority of known planets transiting stars in clusters, providing a valuable sample of planets with known ages and radii. We present the discovery of two planets

We consider magnetohydrodynamics models and observations of transverse oscillations in prominence threads to obtain information on their physical properties such as the magnetic field strength, the plasma density, or the length. We further compare between short and long thread limits in period ratio models and compute the relative plausibility of

We investigate the impact of a stochastic background of primordial magnetic fields (PMF) generated before recombination on the ionization history of the Universe and on the cosmic microwave background (CMB) radiation. Pre-recombination PMFs are dissipated during recombination and reionization via decaying MHD turbulence and ambipolar diffusion

Observations from massive stars in H II regions can help to clarify theories of massive star formation because they show the degree of isolation under which massive stars can be formed. We present a new survey, called 'A-SMASHeR', consisting of massive stars associated to not yet characterized H II regions that are either more distant or more