6 papers
Intense but Harmless: Exo-Space Weather Around an M Dwarf with a Single-Hemisphere Dynamo
Zheng Sun, Julián D. Alvarado-Gómez, Hui Tian +4
M dwarfs are among the most promising host stars in the search for habitable exoplanets. However, their active atmospheres drive intense magnetic activity, including energetic flar…
The ORCA-TWIN qCMOS Experiment I. Science case and commissioning at Calar Alto Observatory
Martin M. Roth, Pasko Roje, Stella Vjesnica +18
We describe a pilot study to explore a new generation of fast and low noise CMOS image sensors for time domain astronomy, using two remote telescopes with a baseline of 1635 km. Th…
High-Resolution Modelling of Coronae and Winds in Solar-type Stars with Varying Rotation Rates I. X-ray Coronae
Yue-Hong Chen, Julián D. Alvarado-Gómez, Xin Cheng +8
Stellar coronae are believed to be the main birthplace of various stellar magnetic activities. However, the structures and properties of stellar coronae remain poorly understood. U…
Searching for rotational X-ray modulation on TIC 277539431
Desmond Dsouza, Katja Poppenhaeger, Ekaterina Ilin
TIC 277539431, a fast rotating M7 dwarf, was detected to host the highest latitude flare to date at . Magnetic activity like stellar flares occurring at high latitude ind…
Is the high-energy environment of K2-18b special?
S. Rukdee, M. Güdel, I. ViloviÄ +7
K2-18b lies near the radius valley that separates super-Earths and sub-Neptunes, marking a key transitional regime in planetary and atmospheric composition. The system offers a val…
Close-in planet induces flares on its host star
Ekaterina Ilin, Harish K. Vedantham, Katja Poppenhäger +4
In the past decade, hundreds of exoplanets have been discovered in extremely short orbits below 10 days. Unlike in the Solar System, planets in these systems orbit their host stars…