Aims. In this work, we exploit the most robust, old, and cosmology-independent age estimates of individual stars from Gaia DR3 to place a lower bound on the age of the Universe, t U. These constraints can be used as an anchor point for any cosmological model, thus providing an upper limit to the Hubble constant H 0. Methods. Our primary stellar age

ASASSN-24fw, monitored by the All-Sky Automated Survey for SuperNovae, underwent a rapid and deep dimming event beginning in late 2024 and lasting until 2025 June. The pre-dimming spectral energy distribution indicates that ASASSN-24fw is an F-type main-sequence star with a persistent infrared excess, corresponding to a fractional luminosity of

Sub-Neptunes with planetary radii of R p ≃ 2─4 R ⊕ are the most common planets around solar-type stars in short-period (P < 100 d) orbits. It is still unclear, however, what their most likely composition is, that is whether they are predominantly gas dwarfs or water worlds. The sub-Neptunes orbiting bright host stars are very valuable because they

Context. The Javalambre VARiability survey (J-VAR) is a multi-filter photometric survey conducted at the Observatorio Astrofísico de Javalambre, covering selected regions of the northern sky, and providing time-domain information for the Javalambre Photometric Local Universe Survey (J-PLUS) fields. J-VAR primarily focuses on small bodies of the

We analyse a sample of 225 star-forming regions from the DESIRED-E project, each with simultaneous determinations of the electron temperature from ionized nitrogen and oxygen, $T_{\rm e}$([N II]) and $T_{\rm e}$([O III]), respectively. We derive new empirical relations connecting the gas-phase metallicity to the global electron temperature, $T_{\rm

We utilize multiepoch line-of-sight velocity measurements from the Milky Way Survey of the Dark Energy Spectroscopic Instrument to estimate the binary fraction for member stars in the dwarf spheroidal galaxy Ursa Minor (UMi). Our dataset comprises 670 distinct member stars, with a total of more than 2000 observations collected over approximately