Context. According to theory, high-energy emission from the coronae of cool stars can severely erode the atmospheres of orbiting planets. No observational tests...

In the notes to Table 1, a unit conversion was incorrect. The text should read 1 MJ Gyr-1 = 6.02e+13 g s-1. As a consequence in the 3rd paragraph of Sect. 3...

We have conducted a detailed study of the object NGC 2451, which actually consists of two different open clusters A and B along the same line of sight at 206 pc...

While most of the exoplanets have been found orbiting around solar-type stars, low-mass stars have recently been recognized as ideal exo-life laboratory...

Context: In transverse coronal loop oscillations, two periodicities have been measured simultaneously and are interpreted as the fundamental kink mode (with...

AB Dor, Speedy Mic, and Rst 137B are in their early post-T Tauri evolutionary phase ( ~107 K toward the saturated-supersaturated boundary but a decline beyond...

We analyze a 96 ks Chandra HETGS observation of the single G-type giant HR 9024. The high flux allows us to examine spectral line and continuum diagnostics at...

We present radio observations of eight ultracool dwarfs with a narrow spectral type range (M8-M9.5) using the Very Large Array at 8.5 GHz. Only the tight M8...

Context. The current distribution of planet mass vs. incident stellar X-ray flux supports the idea that photoevaporation of the atmosphere may take place in...