Strong XUV irradiation of the Earth-sized exoplanets orbiting the ultracool dwarf TRAPPIST-1

• Published in: Monthly notices of the Royal Astronomical Society. Letters Vol. 465; no. 1; pp. L74 - L78
• Main Authors: Wheatley, Peter J., Louden, Tom, Bourrier, Vincent, Ehrenreich, David, Gillon, Michaël
• Format: Journal Article Web Resource
• Language: English
• Published: Blackwell Publishing 01.02.2017
• Subjects: Aérospatiale, astronomie & astrophysique; Physical, chemical, mathematical & earth Sciences; Physique, chimie, mathématiques & sciences de la terre; Space science, astronomy & astrophysics

We present an XMM–Newton X-ray observation of TRAPPIST-1, which is an ultracool dwarf star recently discovered to host three transiting and temperate Earth-sized planets. We find the star is a relatively strong and variable coronal X-ray source with an X-ray luminosity similar to that of the quiet S...