Determining the sequence of events in the formation of stars and planetary systems and
their timescales is essential for understanding those processes, yet establishing ages is …

We confirm and characterize a close-in (${P} _ {{\rm {orb}}} $= 5.425 days), super-Neptune
sized (${5.04} _ {-0.37}^{+ 0.34} $${R} _ {\oplus} $) planet transiting K2-33 (2MASS …

Medium-resolution integral-field spectrographs (IFS) coupled with adaptive-optics such as
Keck/OSIRIS, VLT/MUSE, or SINFONI are appearing as a new avenue for enhancing the …

Context. Emission lines that are indicative of active accretion have been observed for a
number of low-mass companions (M< 30 M Jup) to stars. Line variability is ubiquitous on …

Context. Young, close stars are ideal targets for searching planets using the direct imaging
technique. The determination of stellar parameters is crucial for the interpretation of imaging …

We present evidence that the recently discovered, directly imaged planet HD 131399 Ab is a
background star with nonzero proper motion. From new JHK1L'photometry and …

We present model constraints on the atmospheric structure of HD 106906 b, a planetary-
mass companion orbiting at a∼ 700 au projected separation around a 15 Myr old stellar …

Context. The Upper-Scorpius association (5–11 Myr) contains a unique population of low-
mass (M≤ 30M Jup) brown dwarfs either free-floating, forming wide pairs, or on wide orbits …

Oxygen has been proposed to be a superior tracer, compared to iron, for studying galactic
chemical evolution. In the context of improving our understanding of the evolution of Galactic …

Recent reanalyses of Hipparcos parallax data confirm a previously noted discrepancy with
the Pleiades distance modulus estimated from main-sequence fitting in the color-magnitude …