Context. Thick discs can give invaluable information on the formation and evolution history of galaxies as most, if not all, disc galaxies have a thin (classical) disc and a thick disc. Aims: We study the structure of thick discs in extraordinary depth by reaching a surface brightness limit of μrdeep ˜ 28.5-29 mag arcsec-2 with combined g, r, i

In 2010 we started a spectroscopic survey to obtain visible and near-infrared spectra of primitive asteroids in the main belt. The main objective was to characterize the collisional families located in the inner part of the belt, and believed to be the origin of primitive near-Earth asteroids, in particular those that are the targets of two sample

Based on the observations by the optical navigation camera on the Hayabusa2 spacecraft, stronger 0.7-micron band absorption, which might attribute to hydrated minerals, was found on the pole regions of the C-type asteroid Ryugu. This could be because of less irradiation rate from the Sun.

PolStar is an Explorer-class far ultraviolet (FUV) spectropolarimetry mission designed to target massive stars and their environments. PolStar will take advantage of resonance lines only available in the FUV to measure for the first time the magnetic and wind environment around massive stars to constrain models of rotation and mass loss.

In this paper, we review two different methods to increase image contrast and propose the combination of both to detect faint companions surrounding a host star. Coronagraphy allows us to block light coming from the host star so that the residual star light can be reduced by several orders of magnitude. On the other hand, estimating the Covariance