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

We analyze Atacama Large Millimeter Array (ALMA) observations of the CO(6-5) molecular line and the 432 μm continuum emission from the circumnuclear disk (CND) and the putative torus of the Seyfert 2 galaxy NGC 1068. The kinematics of both the CND and the torus show non-circular motions that are caused by outflows from the AGN. We compare the ALMA

We studied the physical parameters of the penumbra in a large and fully developed sunspot, one of the largest over the last two solar cycles, by using full-Stokes measurements taken at the photospheric Fe I 617.3 nm and chromospheric Ca II 854.2 nm lines with the Interferometric Bidimensional Spectrometer. Inverting measurements with the Non-LTE

We report on the confirmation and mass determination of a transiting planet orbiting the old and inactive G7 dwarf star HD 219666 (M⋆ = 0.92 ± 0.03 M⊙, R⋆ = 1.03 ± 0.03 R⊙, τ⋆ = 10 ± 2 Gyr). With a mass of Mb = 16.6 ± 1.3 M⊕, a radius of Rb = 4.71 ± 0.17 R⊕, and an orbital period of Porb ≃ 6 days, HD 219666 b is a new member of a rare class of