NewAthena Archives

Stellar and planetary properties of our sample. The left plot shows log X-ray flux at Earth (0.2-2.4 keV) vs log Rp R∗ 2 (%). Each planetary system in the sample is plotted, with the host star’s spectral type determining the color and shape. Points with dark outlines have measured X-ray fluxes, and points surrounded with purple circles are in the list of the top 15 candidate targets for AXIS and NewAthena. The method for determining each X-ray flux is given in section 2.1. For fluxes given in literature in a band other than 0.2-2.4 keV, we used the XSPEC models described in section 2.2 to convert the flux to 0.2-2.4 keV. The right plot shows the orbital period (days) and radii (Earth radii) of the planets in the NEA, with planets in our sample highlighted in blue squares. The top 15 candidate targets are shown with darker blue diamonds. The method for determining the top target candidates is described in Section 2.2. -- astro-ph.IM

Astronomy & Telescopes, Atmospheres, Climate, Weather, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Status Report

Detecting Exoplanet Transits With The Next Generation Of X-ray Telescopes

by Keith CowingAugust 15, 2024August 15, 2024

Detecting exoplanet transits at X-ray wavelengths would provide a window into the effects of high energy irradiation on the upper atmospheres of planets. However, stars are relatively dim in the […]

Enceladus, Icy Worlds, Missions & Hardware, Reports, Roadmaps, & Plans, Status Report, Water/Hycean Worlds & Oceanography

Enceladus Is A Top Target For ESA

by Keith CowingMarch 27, 2024March 27, 2024

A fresh, icy crust hides a deep, enigmatic ocean. Plumes of water burst through cracks in the ice, shooting into space. An intrepid lander collects samples and analyses them for […]