The BL Lacertae object VER J0521+211 underwent a notable flaring episode in February 2020. A short-term monitoring campaign, led by the MAGIC (Major Atmospheric Gamma Imaging Cherenkov) collaboration, covering a wide energy range from radio to very high-energy (VHE, 100 GeV < E < 100 TeV) gamma rays was organised to study its evolution. These

Centaurs are small bodies orbiting between Jupiter and Neptune and behave as an intermediate population between trans-Neptunian-belt objects and Jupiter-family comets. As such, their surface composition and evolutionary processes are key to understanding the Solar System's history. However, the mechanisms driving their transformation and the impact

Context. This study is aimed at identifying possible low-mass and sub-stellar companions to stars with well-determined metallicities. We investigate the multiplicity of metal-poor stars along with its impact on formation processes in the conditions of the early universe. Aims. Our goal is to look for wide common proper motion companions to metal

Many techniques have been developed to analyse observations of solar rotational splittings to infer properties of the solar internal rotation rate. In preparation for the analysis of the extensive sets of data now available, we carry out tests and comparisons of a variety of inversion techniques, characterized by their resolution and error

Helioseismology is a powerful tool to probe the internal structure and dynamics of the Sun. However, it requires long uninterrupted datasets to extract the rotational splittings with the highest precision. Two types of facilities were developed. On the one hand, ground-based telescopes such as the Birmingham Solar Oscillation Network (BiSON) and

We present measurements of the microlensing optical depth and event rate toward the Galactic bulge using the data set from the 2006 to 2014 MOA-II survey, which covers 22 bulge fields spanning ∼42 deg 2 between ‑5° < l < 10° and ‑7° < b < ‑1°. In the central region with ∣l∣ < 5°, we estimate an optical depth of and an event rate of Γ = [16.08 ± 0