  We leverage Gaia DR2 parallactic distances to deliver new or revised
estimates of planetary parameters and X-ray irradiation for a distance-limited
($\lesssim 100$ pc) sample of 27 gaseous planets (from super-Earths to hot
Jupiters) with publicly available Chandra and/or XMM observations, for which we
carry out a homogeneous data reduction. For 20 planets with X-ray detected host
stars we make use of the photoionization hydrodynamics code ATES to derive
updated atmospheric mass outflow rates. The newly derived masses/radii are not
consistent with the exoplanet.eu values for five systems; HD 149026b and
WASP-38, for mass; and Au Mic b, HAT-P-20 and HAT-P-2 for radii. Notably, the
lower mass implies a (Saturn-like) density of $0.86\pm 0.09$ g cm$^{-3}$ for HD
149026 b. This independent estimate is consistent with the lowest values
reported in the literature. Separately, we report on the X-ray detection of GJ
9827, HD 219134 and LHS 1140 for the first time. The inferred stellar X-ray
luminosity of LHS 1140 ($1.34^{+0.19}_{-0.21} \times 10^{26}$ erg sec$^{-1}$)
implies that LHS 1140 b is the least irradiated transiting super-Earth known to
orbit within the habitable zone of a nearby M-dwarf.
