We present an analysis of spectroscopic and astrometric data from APOGEE-2 and Gaia
DR2 to identify structures toward the Orion Complex. By applying a hierarchical clustering …

The σ Orionis cluster is important for studying protoplanetary disk evolution, as its
intermediate age (∼ 3–5 Myr) is comparable to the median disk lifetime. We use ALMA to …

Aims. We study the dependence of protoplanetary disk evolution on stellar mass using a
large sample of young stellar objects in nearby young star-forming regions. Methods. We …

We have derived ages for 13 young (< 30 Myr) star-forming regions and find that they are up
to a factor of 2 older than the ages typically adopted in the literature. This result has wide …

Multiplicity is a fundamental property that is set early during stellar lifetimes, and it is a
stringent probe of the physics of star formation. The distribution of close companions around …

Aims. We study the evolution of circumstellar disks in 22 young (1 to 100 Myr) nearby (within
500 pc) associations over the entire mass spectrum using photometry covering from the …

Context. Knowledge of the evolution of circumstellar accretion disks is pivotal to our
understanding of star and planet formation; and yet despite intensive theoretical and …

Following up our recent analysis devoted to the impact of non steady accretion on the
location of young low-mass stars or brown dwarfs in the Herzsprung-Russell diagram, we …

Context. The lack of knowledge of photospheric parameters and the level of chromospheric
activity in young low-mass pre-main sequence stars introduces uncertainties when …

Context. A key science goal of the Gaia-ESO survey (GES) at the VLT is to use the
kinematics of low-mass stars in young clusters and star forming regions to probe their …