We present the first systematic spectroscopic observations of extragalactic transients from the Dark Energy Spectroscopic Instrument (DESI), as part of the DESI Transients Survey program. With 5000 fibers and an ∼8 deg 2 field of view, we exploit DESI as a machine for the discovery and classification of transients. We present transient

Context. Condensates are ubiquitous to all Solar System planets with significant (>10 mbar) atmospheres. The same is true for most exoplanets with characterised atmospheres, with even ultra-hot exoplanets being able to form clouds on their cooler nightsides. One high-interest condensate is titanium, a highly refractory element that as an oxide (TiO

Unlocking the atmospheres of sub-Neptune planets is among the revolutionary accomplishments of JWST. However, such observations require complex data analysis methodologies, which have a strong impact on the derived conclusions. Here, we present an independent re-analysis of the JWST transmission spectrum of the temperate sub-Neptune K2-18 b, aimed

SUNRISE III is a stratospheric balloon-borne solar observatory with a 1 m diameter telescope and three postfocus instruments, along with an image stabilisation system, all within a protective gondola. It samples the lower solar atmosphere, from the solar surface to the middle chromosphere, at a resolution approaching 50 km on the Sun. SUNRISE III

Aims. We search for evidence of star─planet magnetic interactions in the nearby Proxima Centauri planetary system using high-quality, high-spectral-resolution optical observations spanning three years. Methods. We investigate the variability of photospheric and chromospheric features traced by oxides, H I, Na I, Fe I, He I, and Ca II using a

Context. The shape and kinematics of the metal-poor stellar component of the Galactic bulge are still poorly characterized, and, therefore, the origin of this component is not yet strongly constrained. RR Lyrae stars in the bulge have been reported to be associated with the spheroidal, relatively metal-poor component. They offer a way to trace this