TY  - JOUR
A1  - Foster, Grace
A1  - Poppenhäger, Katja
T1  - Identifying interesting planetary systems for future X-ray observations
JF  - Astronomische Nachrichten = Astronomical notes
N2  - X-ray observations of star-planet systems are important to grow our understanding of exoplanets; these observations 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) mission is performing the first all-sky X-ray survey since the 1990s, and provides X-ray fluxes and spectra of exoplanet host stars over a much larger volume than was accessible before. Using new eROSITA data as well as archival data from XMM-Newton, Chandra, and ROSAT, we estimate mass-loss rates of exoplanets under an energy-limited escape scenario and identify several exoplanets with strong X-ray irradiation and expected mass loss that are amenable to follow-up observations at other wavelengths. We model sample spectra using a toy model of an exoplanetary atmosphere to predict what exoplanet transit observations with future X-ray missions such as Athena will look like and estimate the observable X-ray transmission spectrum for a typical hot Jupiter-type exoplanet.
KW  - planets and satellites
KW  - general
KW  - stars
KW  - activity
KW  - coronae
KW  - planetary systems
KW  - X-rays
Y1  - 2022
U6  - https://doi.org/10.1002/asna.20220007
SN  - 1521-3994
VL  - 343
IS  - 4
PB  - Wiley-VCH
CY  - Berlin
ER  -