Identifying interesting planetary systems for future X-ray observations

Abstract

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) 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.

arXiv comment6 pages, 6 figures, XMM-Newton 2021 Science Workshop proceedings

References in corpus (20)

• On the Absorption of X-rays in the Interstellar Medium
• The eROSITA X-ray telescope on SRG
• Most 1.6 Earth-Radius Planets are not Rocky
• Atmospheric Escape from Hot Jupiters
• Probabilistic Forecasting of the Masses and Radii of Other Worlds
• Planetary evaporation by UV & X-ray radiation: basic hydrodynamics
• Estimation of the XUV radiation onto close planets and their evaporation
• How Thermal Evolution and Mass Loss Sculpt Populations of Super-Earths and Sub-Neptunes: Application to the Kepler-11 System and Beyond
• Evaporation of the planet HD189733b observed in HI Lyman-alpha
• The Ultraviolet Radiation Environment Around M dwarf Exoplanet Host Stars
• The Exoplanet Population Observation Simulator. I - The Inner Edges of Planetary Systems
• TESS Hunt for Young and Maturing Exoplanets (THYME): A planet in the 45 Myr Tucana-Horologium association
• Energy-limited escape revised
• Jupiter's composition suggests its core assembled exterior to the N2 snowline
• The Athena space X-ray Observatory and the astrophysics of hot plasma
• The HU Aqr planetary system hypothesis revisited
• X-ray irradiation and evaporation of the four young planets around V1298 Tau
• Constraints on the mass and atmospheric composition and evolution of the low-density young planet DS Tuc A b
• WASP-180Ab: Doppler tomography of an hot Jupiter orbiting the primary star in a visual binary
• Testing the planetary models of HU Aquarii