Context. The Spitzer Survey of Stellar Structure in Galaxies (S 4G), together with its Early Type Galaxy (ETG) extension, stands as the most extensive dataset of deep uniform mid-infrared (mid-IR; 3.6 and 4.5 μm) imaging for a sample of 2817 nearby (d < 40 Mpc) galaxies. However, the velocity criterion used to select the original sample results in

Context. A multitude of spectral activity indicators are routinely computed nowadays from the spectra generated as part of planet-hunting radial velocity surveys. Searching for shared periods among them can help to robustly identify astrophysical quantities of interest, such as the stellar rotation period. However, this identification can be

The Atacama Large Aperture Submillimetre Telescope (AtLAST) is a mature concept for the next generation 50-meter class single-dish astronomical observatory operating at submillimetre wavelengths, powered by renewable energy and run as a facility telescope by an international partnership. AtLAST will open a new discovery space in numerous fields of

Data and considerations are presented about the sustainability of astronomical observatories in the Spanish territory. While still not comparable to other science institutions, the energy consumption of large telescopic installations is high. To partially compensate it, effort has been put into producing in situ green energy, taking advantage of

We report on the detection of optical/near-infrared (O-IR) quasi-periodic oscillations (QPOs) from the black hole (BH) X-ray transient Swift J1727.8–1613. We obtained three X-ray and O-IR high-time-resolution observations of the source during its intermediate state (2023 September 9, 15, and 17) using NICER, HAWK-I@VLT, HIPERCAM@GTC, and ULTRACAM

The most probable outcome of planetary formation is a sub-Neptune, a body with a radius between 2.0 and 3.5 Earth radii. This type of exoplanet has no counterpart in the Solar System, but they are very common elsewhere, and many of them have been observed to potentially host habitable surface conditions. Population studies have revealed a scarcity