Circumstellar dust exists around several hundred main sequence stars. For the youngest
stars, that dust could be a remnant of the protoplanetary disk. Mostly it is inferred to be …

Context. The census of stellar and substellar companions of nearby stars is largely
incomplete, in particular toward the low-mass brown dwarf and long-period exoplanets. It is …

Context. In the era of large Galactic stellar surveys, carefully calibrating and validating the
data sets has become an important and integral part of the data analysis. Moreover, new …

A warm/hot dust component (at temperature 300 K) has been detected around 20% of A, F,
G, K stars. This component is called 'exozodiacal dust'as it presents similarities with the …

Context. PIONIER stands for Precision Integrated-Optics Near-infrared Imaging ExpeRiment.
It combines four 1.8 m Auxilliary Telescopes or four 8m Unit Telescopes of the Very Large …

We combine results from interferometry, asteroseismology and spectroscopy to determine
accurate fundamental parameters of 23 bright solar-type stars, from spectral type F5 to K2 …

A new speckle and wide-field imaging instrument for the WIYN telescope called NN-
EXPLORE Exoplanet Stellar Speckle Imager (NESSI) is described. NESSI offers …

Context. The Gl 486 system consists of a very nearby, relatively bright, weakly active M3. 5 V
star at just 8 pc with a warm transiting rocky planet of about 1.3 R⊕ and 3.0 M⊕. It is ideal …

Debris disks are optically thin, almost gas-free dusty disks observed around a significant
fraction of main-sequence stars older than about 10 Myr. Since the circumstellar dust is short …

We measured the radii of 7 low and very low-mass stars using long baseline interferometry
with the VLTI interferometer and its VINCI and AMBER near-infrared recombiners. We use …