Mon. Not. R. Astron. Soc., 478, 1193-1208 (2018/July-3)
The XUV environments of exoplanets from Jupiter-size to super-Earth.
KING G.W., WHEATLEY P.J., SALZ M., BOURRIER V., CZESLA S., EHRENREICH D., KIRK J., LECAVELIER DES ETANGS A., LOUDEN T., SCHMITT J. and SCHNEIDER P.C.
Abstract (from CDS):
Planets that reside close-in to their host star are subject to intense high-energy irradiation. Extreme-ultraviolet (EUV) and X-ray radiation (together, XUV) is thought to drive mass-loss from planets with volatile envelopes. We present XMM-Newton observations of six nearby stars hosting transiting planets in tight orbits (with orbital period, Porb < 10 d), wherein we characterize the XUV emission from the stars and subsequent irradiation levels at the planets. In order to reconstruct the unobservable EUV emission, we derive a new set of relations from Solar TIMED/SEE data that are applicable to the standard bands of the current generation of X-ray instruments. From our sample, WASP-80b and HD 149026b experience the highest irradiation level, but HAT-P-11b is probably the best candidate for Ly α evaporation investigations because of the system's proximity to the Solar system. The four smallest planets have likely lost a greater percentage of their mass over their lives than their larger counterparts. We also detect the transit of WASP-80b in the near-ultraviolet with the optical monitor on XMM-Newton.
© 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society
planets and satellites: atmospheres - stars: individual: (GJ 436, GJ 3470,HAT-P-11, HD 97658, HD 149026, WASP-80) - ultraviolet: stars - X-rays: stars
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