We report discovery of a bright, nearby () Sun-like star orbiting a dark object. We identified
the system as a black hole candidate via its astrometric orbital solution from the Gaia …

The Sun provides a critical benchmark for the general study of stellar structure and
evolution. Also, knowledge about the internal properties of the Sun is important for the …

Though distant and seemingly unreachable, planets outside the Solar System, or
exoplanets, have captivated the imagination of scientists and stargazers alike. With more …

The overlap between the spectroscopic Galactic Archaeology with HERMES (GALAH)
survey and Gaia provides a high-dimensional chemodynamical space of unprecedented …

Context. It is well known that the magnetic activity of solar-type stars decreases with age, but
it is widely debated in the literature whether there is a smooth decline or if there is an early …

The bright star λ Ser hosts a hot Neptune with a minimum mass of 13.6 M⊕ and a 15.5 day
orbit. It also appears to be a solar analog, with a mean rotation period of 25.8 days and …

The lithium present in the photospheres of solar-type stars is transported to the inner parts
by convection, reaching regions even somewhat below the convection zone, by non …

Aims. We address the existence and origin of the lithium (Li) desert, a region in the Li–T eff
plane sparsely populated by stars. Here we analyze some of the explanations that have …

This work aims to examine in detail the depletion of lithium in solar twins to better constrain
stellar evolution models and investigate its possible connection with exoplanets. We employ …

Aims. A previous study of correlations between element abundances and ages of solar twin
stars in the solar neighborhood is extended to include Sc, Mn, Cu, and Ba to obtain new …