Search Publications

X-exoplanets coronal models and planet photoevaporation

Sanz-Forcada, Jorge

Characterizing X-ray activity cycles of young solar-like stars with solar observations

Stelzer, Beate; Orlando, Salvatore; Coffaro, Martina

Throughout an activity cycle, magnetic structures rise to the stellar surface, evolve and decay. Tracing their evolution on a stellar corona allows us to characterize the X-ray cycles. However, directly mapping magnetic structures is feasible only for the Sun, while such structures are spatially unresolved with present-day X-ray instruments on ste…

Planet interactions at a young age

Petralia, Antonino; Micela, Giuseppina; Cecchi-Pestellini, Cesare +2 more

X-ray irradiation of three planets around Hyades star K2 -136

Fernández Fernández, Jorge; Wheatley, Peter J.

We study the X-ray irradiation and likely photoevaporation of the three planets around the star K2-136. These are the Earth-sized K2-136 b, the mini-Neptune K2-136 c, and the super-Earth K2-136 d. XMM-Newton observations of the star indicate an X-ray luminosity of $(1.18\pm0.1)\times10^{28}$ erg s$^{-1}$ in the range 0.15 to 2.4 keV, resulting in …

X-ray views of our solar system

Branduardi-Raymont, Graziella

Identifying interesting planetary systems for future X-ray observations

Poppenhaeger, Katja; Foster, Grace

X-ray observations of star-planet systems are important to grow our understanding of exoplanets; these observation allow for studies of photoevaporation of the exoplanetary atmosphere, and in some cases even estimations of the size of the outer planetary atmosphere. The German-Russian eROSITA instrument onboard the SRG (Spectrum Roentgen Gamma) mi…

Editor's note: A high-energy view of exoplanets and their environments

Schartel, Norbert

The harsh environment where exoplanets live

Pillitteri, Ignazio

WX Cen is X‑ray quiet: Does this signify a high‑mass or a low‑mass binary?

Zhekov, Svetozar A.

We present results from analysis of the XMM–Newton observation (2021 February) of the enigmatic object WX Cen: a presumed massive Wolf–Rayet (WR) binary, (WN3 + WC4), or a low‑mass binary. WX Cen was not detected in X‑rays. Its UV emission shows periodic variability with a period (0.405–0.434 day) similar to that found in the optical for this obje…