We present the most comprehensive near-ultraviolet (NUV: 2550-3255 Angstrom) activity record to date for the Alpha Centauri AB system, combining archival IUE and HST observations spanning nearly five decades with […]
Astrometric monitoring of stars provides a promising method for discovery of low-mass planets around nearby Sun-like stars.
We present measurements of near-infrared (NIR) terrestrial airglow produced by helium and oxygen in the exosphere as observed by SPHEREx. Using eight months of survey data obtained from a 680 […]
Context. An image of Lyman-Ī± (LyĪ±) emission from Europa obtained with the Hubble Space Telescopeās Space Telescope Imaging Spectrograph (HST/STIS) provided the first evidence for localized water vapor (H2O) aurora, […]
![[TOP] Time evolution of H2 mixing ratio for an atmosphere with 100% H2O. The heatmaps display vertical profiles over the 360-day simulation duration, with pressure (in bars) on the y-axis and time (in days) on the x-axis. The upper row shows results from the YMDF and FF models, while the bottom row corresponds to the FF 400 K and the CF model, as indicated on the panels. [BOTTOM] Heatmaps of CH4 mixing ratio in the atmosphere with 1% H2O over the 360-day simulation period for an atmosphere containing 100% water vapour analogous to the previous Fig. 8 -- astro-ph.EP](https://i0.wp.com/astrobiology.com/wp-content/uploads/2026/04/Stellar-Flare-driven-Evolution.png?resize=1200%2C718&ssl=1)
Context. M dwarfs are key targets for terrestrial exoplanet studies, with prospects for atmospheric spectroscopy. However, strong stellar magnetic activity and frequent flaring require modelling efforts to assess their impact […]
While photoionization rates of Ganymede‘s O2 dominated atmosphere are well constrained, the contribution of electron-impact ionization is rather uncertain.
Close-in terrestrial exoplanets around M dwarfs reside in dense, magnetized winds, where non-ideal plasma coupling can strongly affect how electromagnetic energy is redistributed within the dayside interaction region.
As stars evolve, they undergo significant changes in their physical properties, which can have a profound impact on the planets orbiting them.
We all know that stars radiate light and much more. But radiation belts can also surround many other celestial bodies, such as planets.
What happens when a solar superstorm hits Mars? Thanks to the European Space Agencyās Mars orbiters, we now know: glitching spacecraft and a supercharged upper atmosphere.
